index.html.in

   1 <!doctype html>
   2 <html lang="en-US">
   3   <head>
   4     <meta charset="utf-8">
   5     <meta name="viewport" content="width=device-width, initial-scale=1" />
   6     <link rel="icon"
   7           type="image/svg+xml"
   8           href="data:image/svg+xml;base64,@FAVICON@" />
   9
  10     <title>
  11       CharmBypass: got that transit equity
  12     </title>
  13
  14     <style>
  15       body {
  16         /* For consistency with the SVG */
  17         font-family: sans-serif;
  18       }
  19
  20       fieldset {
  21         margin-top: 1em;
  22         padding-top: 1em;
  23       }
  24
  25       input[type=submit] {
  26         margin-top: 1em;
  27         margin-bottom: 1em;
  28       }
  29
  30       legend {
  31         font-weight: bold;
  32       }
  33
  34       /* Display form errors for the one browser that doesn't support
  35        * them natively, mobile Firefox. We use "visibility" to toggle
  36        * it on and off, but "display" to hide it completely in non-
  37        * stupid web browsers. */
  38       #marc-form-errors {
  39         color: #a00;
  40         visibility: hidden;
  41         display: none;
  42       }
  43
  44       svg {
  45         /* Set the height to 100% of the screen, which we'll keep; and the
  46          * initial position to (0,0), which we're going to change
  47          * every time the window is resized, because the exact amount
  48          * that we have to slide the SVG to the left to get the ticket
  49          * into the center will change. */
  50         position: fixed;
  51         top: 0;
  52         left: 0;
  53         height: 100%;
  54
  55         /* Hide everything by default. We only show it once the user has
  56          * submitted the menu form */
  57         display: none;
  58       }
  59
  60       /* The blinking fade in/out animation for the ticket date and time */
  61       @keyframes blink {
  62         25% { opacity: 0.5; }
  63         50% { opacity: 0;   }
  64         75% { opacity: 0.5; }
  65       }
  66
  67       #tickettime, #ticketdate {
  68         /* 300 two-second blinks is ten minutes */
  69         animation: blink 2s linear 300;
  70       }
  71
  72       /* Define, load, and specify the custom font we use for the ticket
  73        * date, time, and service name. */
  74       @font-face {
  75         font-family: "CharmBypass Regular";
  76         src:
  77           url("data:font/woff2;base64,@CBPREGULAR@") format("woff2")
  78       }
  79
  80       #origindest, #servicename, #tickettime, #ticketdate, #codetext, #zone {
  81         font-family: "CharmBypass Regular", sans-serif;
  82       }
  83
  84       @font-face {
  85         font-family: "CharmBypass Bold";
  86         src:
  87           url("data:font/woff2;base64,@CBPBOLD@") format("woff2")
  88       }
  89
  90       #serviceid {
  91         font-family: "CharmBypass Bold", sans-serif;
  92       }
  93
  94       /************************/
  95       /* Scrolling animations */
  96       /************************/
  97
  98       /* Bus */
  99       @keyframes busroll {
 100         from { transform: translateX(0%);    }
 101         to   { transform: translateX(-100%); }
 102       }
 103
 104       #bus {
 105         animation: busroll 15s linear infinite;
 106       }
 107
 108
 109       /* Tram */
 110       @keyframes tramroll {
 111         from { transform: translateX(0%);   }
 112         to   { transform: translateX(100%); }
 113       }
 114
 115       #tram {
 116         animation: tramroll 15s linear infinite;
 117       }
 118
 119
 120       /* Train */
 121       @keyframes trainroll {
 122         from { transform: translateX(0%);   }
 123         to   { transform: translateX(100%); }
 124       }
 125
 126       #train {
 127         animation: trainroll 10s linear infinite;
 128       }
 129
 130
 131       /* Clouds */
 132       @keyframes cloudsfloat {
 133         from { transform: translateX(0%);   }
 134         to   { transform: translateX(-50%); }
 135       }
 136
 137       #clouds {
 138         animation: cloudsfloat 25s linear infinite;
 139       }
 140
 141       @keyframes cloudscopyfloat {
 142         from { transform: translateX(0%);   }
 143         to   { transform: translateX(-50%); }
 144       }
 145
 146       #cloudscopy {
 147         animation: cloudscopyfloat 25s linear infinite;
 148       }
 149
 150
 151       /* Trees */
 152       @keyframes treespass {
 153         from { transform: translateX(0%);   }
 154         to   { transform: translateX(-50%); }
 155       }
 156
 157       #trees {
 158         /* The trees move a little faster than the clouds */
 159         animation: treespass 16s linear infinite;
 160       }
 161
 162       @keyframes treescopypass {
 163         from { transform: translateX(0%);   }
 164         to   { transform: translateX(-50%); }
 165       }
 166
 167       #treescopy {
 168         /* The trees move a little faster than the clouds */
 169         animation: treescopypass 16s linear infinite;
 170       }
 171
 172
 173       /* City skyline */
 174       @keyframes cityscroll {
 175         from { transform: translateX(0%);   }
 176         to   { transform: translateX(-50%); }
 177       }
 178
 179       #city {
 180         /* The city moves faster than the clouds but slower
 181          * than the trees */
 182         animation: cityscroll 20s linear infinite;
 183       }
 184
 185       @keyframes citycopyscroll {
 186         from { transform: translateX(0%);   }
 187         to   { transform: translateX(-50%); }
 188       }
 189
 190       #citycopy {
 191         /* The city moves faster than the clouds but slower
 192          * than the trees */
 193         animation: citycopyscroll 20s linear infinite;
 194       }
 195     </style>
 196   </head>
 197
 198   <body>
 199     <div id="menu">
 200       <h1>CharmBypass</h1>
 201       <p><strong>got that <em>transit equity</em></strong></p>
 202
 203       <form>
 204         <fieldset>
 205           <legend>Local Bus, Light Rail, or Metro</legend>
 206           <div>
 207             <label for="code1">
 208               Daily security code (optional):
 209             </label>
 210             <input id="code1"
 211                    name="code"
 212                    type="text"
 213                    size="2"
 214                    minlength="2"
 215                    maxlength="2"
 216                    pattern="[a-zA-Z0-9]*" />
 217           </div>
 218           <input type="hidden" name="servicename" value="BaltimoreLink" />
 219           <input type="submit" name="go" value="Generate Ticket" />
 220         </fieldset>
 221       </form>
 222       <form>
 223         <fieldset>
 224           <legend>Commuter Bus</legend>
 225           <input type="hidden" name="serviceid" value="R" />
 226           <input type="hidden" name="servicename" value="Commuter Bus" />
 227
 228           <div>
 229             <label for="code2">
 230               Daily security code (optional):
 231             </label>
 232             <input id="code2"
 233                    name="code"
 234                    type="text"
 235                    size="2"
 236                    minlength="2"
 237                    maxlength="2"
 238                    pattern="[a-zA-Z0-9]*" />
 239           </div>
 240
 241           <p>
 242             Zone<sup>&dagger;</sup>:
 243           </p>
 244           <div>
 245             <input type="radio" required
 246                    name="zone"
 247                    id="zone1"
 248                    value="Zone 1" />
 249             <label for="zone1">Zone 1</label>
 250           </div>
 251           <div>
 252             <input type="radio" required
 253                    name="zone"
 254                    id="zone2"
 255                    value="Zone 2" />
 256             <label for="zone2">Zone 2</label>
 257           </div>
 258           <div>
 259             <input type="radio" required checked
 260                    name="zone"
 261                    id="zone3"
 262                    value="Zone 3" />
 263             <label for="zone3">Zone 3</label>
 264           </div>
 265           <div>
 266             <input type="radio" required
 267                    name="zone"
 268                    id="zone4"
 269                    value="Zone 4" />
 270             <label for="zone4">Zone 4</label>
 271           </div>
 272           <div>
 273             <input type="radio" required
 274                    name="zone"
 275                    id="zone5"
 276                    value="Zone 5" />
 277             <label for="zone5">Zone 5</label>
 278           </div>
 279
 280           <input type="submit" name="go" value="Generate Ticket" />
 281
 282           <p>
 283             <sup>&dagger;</sup>
 284             On the MTA's PDF schedule for your route
 285           </p>
 286         </fieldset>
 287       </form>
 288       <form>
 289         <fieldset>
 290           <legend>MARC Train</legend>
 291
 292           <div>
 293             <label for="code3">
 294               Daily security code (optional):
 295             </label>
 296             <input id="code3"
 297                    name="code"
 298                    type="text"
 299                    size="2"
 300                    minlength="2"
 301                    maxlength="2"
 302                    pattern="[a-zA-Z0-9]*" />
 303           </div>
 304
 305           <p>Origin:</p>
 306           <div>
 307             <input type="radio" required checked
 308                    name="origin"
 309                    id="origin1"
 310                    value="BAL" />
 311             <label for="origin1">Baltimore/Penn (Penn Line)</label>
 312           </div>
 313           <div>
 314             <input type="radio" required
 315                    name="origin"
 316                    id="origin2"
 317                    value="BCA" />
 318             <label for="origin2">Baltimore/Camden (Camden Line)</label>
 319           </div>
 320           <div>
 321             <input type="radio" required
 322                    name="origin"
 323                    id="origin3"
 324                    value="BWE" />
 325             <label for="origin3">Bowie State (Penn Line)</label>
 326           </div>
 327           <div>
 328             <input type="radio" required
 329                    name="origin"
 330                    id="origin4"
 331                    value="BWI" />
 332             <label for="origin4">BWI Airport (Penn Line)</label>
 333           </div>
 334           <div>
 335             <input type="radio" required
 336                    name="origin"
 337                    id="origin5"
 338                    value="CPK" />
 339             <label for="origin5">College Park (Camden Line)</label>
 340           </div>
 341           <div>
 342             <input type="radio" required
 343                    name="origin"
 344                    id="origin6"
 345                    value="SEB" />
 346             <label for="origin6">Seabrook (Penn Line)</label>
 347           </div>
 348           <div>
 349             <input type="radio" required
 350                    name="origin"
 351                    id="origin7"
 352                    value="WAS" />
 353             <label for="origin7">Washington D.C.</label>
 354           </div>
 355           <div>
 356             <input type="radio" required
 357                    name="origin"
 358                    id="origin8"
 359                    value="WBL" />
 360             <label for="origin8">West Baltimore (Penn Line)</label>
 361           </div>
 362
 363           <p>Destination:</p>
 364           <div>
 365             <input type="radio" required
 366                    name="destination"
 367                    id="destination1"
 368                    value="BAL" />
 369             <label for="destination1">Baltimore/Penn (Penn Line)</label>
 370           </div>
 371           <div>
 372             <input type="radio" required
 373                    name="destination"
 374                    id="destination2"
 375                    value="BCA" />
 376             <label for="destination2">Baltimore/Camden (Camden Line)</label>
 377           </div>
 378           <div>
 379             <input type="radio" required
 380                    name="destination"
 381                    id="destination3"
 382                    value="BWE" />
 383             <label for="destination3">Bowie State (Penn Line)</label>
 384           </div>
 385           <div>
 386             <input type="radio" required
 387                    name="destination"
 388                    id="destination4"
 389                    value="BWI" />
 390             <label for="destination4">BWI Airport (Penn Line)</label>
 391           </div>
 392           <div>
 393             <input type="radio" required
 394                    name="destination"
 395                    id="destination5"
 396                    value="CPK" />
 397             <label for="destination5">College Park (Camden Line)</label>
 398           </div>
 399           <div>
 400             <input type="radio" required
 401                    name="destination"
 402                    id="destination6"
 403                    value="SEB" />
 404             <label for="destination6">Seabrook (Penn Line)</label>
 405           </div>
 406           <div>
 407             <input type="radio" required checked
 408                    name="destination"
 409                    id="destination7"
 410                    value="WAS" />
 411             <label for="destination7">Washington D.C.</label>
 412           </div>
 413           <div>
 414             <input type="radio" required
 415                    name="destination"
 416                    id="destination8"
 417                    value="WBL" />
 418             <label for="destination8">West Baltimore (Penn Line)</label>
 419           </div>
 420
 421           <p id="marc-form-errors">OK</p>
 422
 423           <input type="hidden" name="serviceid" value="R" />
 424           <input type="hidden" name="servicename" value="MARC Train" />
 425           <input type="submit"
 426                  name="go"
 427                  id="marc-submit"
 428                  value="Generate Ticket" />
 429         </fieldset>
 430       </form>
 431
 432       <p>
 433         About CharmBypass:
 434       </p>
 435       <ol>
 436         <li>
 437           <a href="https://michael.orlitzky.com/articles/charmbypass_pt._1%3A_introduction.xhtml">
 438             Introduction
 439           </a>
 440         </li>
 441         <li>
 442           <a href="https://michael.orlitzky.com/articles/charmbypass_pt._2%3A_analysis.xhtml">
 443             Analysis
 444           </a>
 445         </li>
 446       </ol>
 447     </div>
 448
 449     @SVGDATA@
 450
 451     <script>
 452
 453       /**
 454        * Center the ticket within the browser by translating the SVG
 455        * until the ticket and the viewport centerlines coincide.
 456        */
 457       function center_ticket() {
 458         /* We're relying on the SVG being the full height of the
 459          * viewport already, and on the aspect ratio being
 460          * preserved. First, find the center of the ticket. */
 461         const r = document.getElementById("ticket").getBoundingClientRect();
 462         const c = r.left + (r.width / 2);
 463
 464         /* That's the center-line of the ticket. We want to move it to
 465          * the center-line of the viewport. */
 466         const vc = document.documentElement.clientWidth / 2;
 467
 468         /* This is how much we need to translate the SVG */
 469         const hdelta = vc - c;
 470
 471         /* But before we can set the absolute left-coordinate of the
 472          * SVG, we need to know where it is now. Note: without the
 473          * "px" this doesn't default to pixels like CSS does. */
 474         const svg = document.querySelector("svg");
 475         svg.style.left = (svg.getBoundingClientRect().left + hdelta) + "px";
 476       }
 477
 478
 479       /**
 480        * Set the service identifier from the querystring if it's there.
 481        * Otherwise, leave it at the default of "F".
 482        */
 483       function set_service_id() {
 484         const sid = document.getElementById("serviceid");
 485
 486         /* Get the "serviceid" from the querystring if it's there */
 487         const params = new URLSearchParams(document.location.search);
 488         if (params.get("serviceid")) {
 489           sid.textContent = params.get("serviceid");
 490         }
 491       }
 492
 493
 494       /**
 495        * Set the service name from the querystring if it's there.
 496        * Otherwise, leave it at the default of "BaltimoreLink".
 497        */
 498       function set_service_name() {
 499         const sid = document.getElementById("servicename");
 500
 501         /* Get the "servicename" from the querystring if it's there */
 502         const params = new URLSearchParams(document.location.search);
 503         if (params.get("servicename")) {
 504           sid.textContent = params.get("servicename");
 505         }
 506       }
 507
 508
 509       /**
 510        * Set the zone from the given "zone" parameter and then unhide it.
 511        */
 512       function set_zone(zone) {
 513         const z = document.getElementById("zone");
 514
 515         z.textContent = zone;
 516         z.style.display = "block"; /* hidden by default */
 517       }
 518
 519
 520       /**
 521        * Resize the  ticket background based on the service name.
 522        * The BaltimoreLink, Commuter Bus, and MARC Train tickets
 523        * are all different heights and are arranged vertically a
 524        * bit different.
 525        *
 526        * Rather than design three completelty separate tickets and
 527        * then have to keep track of which one we're using, I have
 528        * instead decided to use one ticket and to reposition it
 529        * on-the-fly based on the service name. This is necessarily
 530        * a bit ugly because it involves a lot of magic numbers that
 531        * can only be explained if you open up inkscape with a CharmPass
 532        * screenshot to see where things belong and how to get them there.
 533        *
 534        * The SVG was designed with BaltimoreLink in mind, so this
 535        * is a no-op if the service is BaltimoreLink.
 536        */
 537       function resize_ticket() {
 538         /* Get the "servicename" from the querystring if it's there */
 539         const params = new URLSearchParams(document.location.search);
 540         const tbg = document.getElementById("ticketbg");
 541         const t = document.getElementById("ticket");
 542         const sn = document.getElementById("servicename");
 543
 544         if (params.get("servicename") === "Commuter Bus") {
 545           /* The top of the background is initially at y=246.859, and
 546            * we scale it by a factor of 1.12 to y=276.482 for a change
 547            * of 29.623. So after we scale it, we translate it upwards
 548            * by that amount to put it back where it started. */
 549           tbg.setAttribute("transform", "translate(0 -29.623) scale(1 1.12)");
 550
 551           /* Now translate the entire ticket up by the magic amount, 1/5
 552            * of the size change we made to the background. This ratio
 553            * was found by measuring pixels in side-by-side screenshots
 554            * of BaltimoreLink and Commuter Bus tickets. */
 555           t.setAttribute("transform", "translate(0 -9.33)");
 556
 557           /* More magic numbers discovered by comparing the two
 558            * tickets overlayed in inkscape */
 559           sn.setAttribute("transform", "translate(0 64.28)");
 560         }
 561         else if (params.get("servicename") === "MARC Train") {
 562           /* insane tricks are explained above */
 563           tbg.setAttribute("transform",
 564                            "translate(0 -72.378) scale(1 1.2932)");
 565           t.setAttribute("transform", "translate(0 -67.17)");
 566           sn.setAttribute("transform", "translate(0 131.0)");
 567         }
 568       }
 569
 570
 571       /**
 572        * Set the security code from the querystring if it was given;
 573        * otherwise generate a random code.
 574        */
 575       function set_code() {
 576         const ct = document.getElementById("codetext");
 577
 578         /* Get the "code" from the querystring if it's there */
 579         const params = new URLSearchParams(document.location.search);
 580         if (params.get("code")) {
 581           ct.textContent = params.get("code").toUpperCase();
 582         }
 583         else {
 584           /* Otherwise, use a random code */
 585           const bucket = ["0","1","2","3","4","5","6","7","8","9",
 586                           "A","B","C","D","E","F","G","H","I","J",
 587                           "K","L","M","N","O","P","Q","R","S","T",
 588                           "U","V","W","X","Y","Z"];
 589
 590           /* Two random ints between 0 and 35 */
 591           const i1 = Math.floor(Math.random() * 36);
 592           const i2 = Math.floor(Math.random() * 36);
 593           const d1 = bucket[i1];
 594           const d2 = bucket[i2];
 595           ct.textContent = d1 + d2;
 596         }
 597       }
 598
 599
 600       /**
 601        * Center the security code within its container.
 602        *
 603        * Some codes like "II" and "WW" can take up wildly different
 604        * amounts of horizonetal space, but they should always be
 605        * centered inside their little red box. This turns out to be
 606        * harder than it sounds because we can only find the width of
 607        * the code in browser coordinates, whereas its "x" coordinate
 608        * is in SVG coordinates. Anyway, we do it.
 609        */
 610       function center_code() {
 611         /* Center the security code inside its red box */
 612         const ct = document.getElementById("codetext");
 613         const bg = document.getElementById("codebg");
 614
 615         /* First, find the center of the red box */
 616         const r1 = bg.getBoundingClientRect();
 617         const c1 = r1.left + (r1.width / 2);
 618
 619         /* Now the center of the code text */
 620         const r2 = ct.getBoundingClientRect();
 621         const c2 = r2.left + (r2.width / 2);
 622
 623         /* What do we add to c2 to make it equal to c1? */
 624         const hdelta = c1 - c2;
 625
 626         /* We've measured everything so far in "client rect"
 627          * coordinates, because that's the only available measurement
 628          * we have for the width of the <text> element. But when we
 629          * reposition that <text> element, it will be by adjusting its
 630          * "x" attribute, and that attribute uses a different coordinate
 631          * system than the client rect does. Specifically, "x" refers to
 632          * an offset within the SVG's coordinate system, and the client
 633          * rect coordinates are pixels on-screen. To convert between the
 634          * two, we can take the "width" attribute of the background
 635          * element and compare it to the width of the background
 636          * element's client rect. Since the size of the background is
 637          * fixed, this should give us a multiplier that turns client rect
 638          * distances (what we have) into SVG distances (what we want) */
 639         const client_to_svg = parseFloat(bg.getAttribute("width"))/r1.width;
 640
 641         /* Convert hdelta from client rect to SVG coordinates */
 642         const svg_hdelta = hdelta * client_to_svg;
 643
 644         /* Since this <text> element has an "x" attribute it's easier for
 645          * us to shift that than it is to mess with the "left" style. */
 646         ct.setAttribute("x", parseFloat(ct.getAttribute("x")) + svg_hdelta);
 647       }
 648
 649       /**
 650        * Set the ticket's expiration date and time.
 651        *
 652        * BaltimoreLink and MARC Train tickets expire after 90 minutes;
 653        * while Commuter Bus tickets expire after 10 minutes.
 654        */
 655       function set_ticket_expiry() {
 656         /* There are two parameters, time and date, that we store in one
 657          * underlying "date" variable. */
 658         const date = new Date();
 659
 660         /* BaltimoreLink and MARC Train */
 661         let minutes = 90;
 662         const params = new URLSearchParams(document.location.search);
 663         if (params.get("servicename") === "Commuter Bus") {
 664           /* Commuter bus tickets are only valid for ten minutes */
 665           minutes = 10;
 666         }
 667
 668         /* We use the low-level get/setTime to change the number of
 669          * milliseconds since the epoch that this date represents
 670          * Obviously correct, and avoids all suspicious corner cases
 671          * for a few more decades. */
 672         date.setTime(date.getTime() + (minutes*60*1000));
 673
 674         tt = document.getElementById("tickettime");
 675         tt.textContent = date.toLocaleTimeString();
 676
 677         const td = document.getElementById("ticketdate");
 678         const dateopts = {
 679           day: "2-digit",
 680           month: "2-digit",
 681           year: "2-digit"
 682         };
 683         td.textContent = date.toLocaleDateString("en-US", dateopts);
 684       }
 685
 686
 687       /**
 688        * Swap the day/night sky colors.
 689        *
 690        * We use CSS classes to keep track of the current state because
 691        * it's a tiny bit cleaner than a global variable, but for some
 692        * reason we can't use those same classes to actually change the
 693        * color. (The classes, change, but the color doesn't.) Rather
 694        * than waste time trying to explain this, we just set the "fill"
 695        * attribute ourselves whenever we swap classes.
 696        */
 697       function swap_day_night() {
 698         const sky = document.getElementById("sky");
 699
 700         if (sky.getAttribute("class") === "night") {
 701           sky.setAttribute("fill", "#efb02f");
 702           sky.setAttribute("class", "day");
 703         }
 704         else {
 705           /* Put this case second so that the first time the
 706            * screen is tapped (when there are no classes on
 707            * the sky element) the color still changes. */
 708           sky.setAttribute("fill", "#143b66");
 709           sky.setAttribute("class", "night");
 710         }
 711       }
 712
 713
 714       /**
 715        * Compute the zone (string) for the given origin/destination pair.
 716        *
 717        * If we don't know it or if you chose in invalid pair (destination
 718        * not on the same line as your origin?) then null is returned.
 719        */
 720       function compute_marc_zone(src, dest) {
 721
 722         /* Sorted on the first component, then the second.
 723          *
 724          * Key:
 725          *
 726          *   $6.00 => 1
 727          *   $7.00 => 2
 728          *   $8.00 => 3
 729          *   $9.00 => 4
 730          */
 731         const zone_map = {
 732           BAL_BWE: 2,
 733           BAL_BWI: 1,
 734           BAL_SEB: 3,
 735           BAL_WAS: 4,
 736           BAL_WBL: 1,
 737           BCA_CPK: 3,
 738           BCA_WAS: 4,
 739           BWE_BWI: 1,
 740           BWE_SEB: 1,
 741           BWE_WAS: 2,
 742           BWE_WBL: 2,
 743           BWI_SEB: 2,
 744           BWI_WAS: 3,
 745           BWI_WBL: 1,
 746           SEB_WAS: 1,
 747           SEB_WBL: 3,
 748           WAS_WBL: 4
 749         };
 750
 751         /* Forward direction key for zone_map */
 752         const fwd = src + "_" +  dest;
 753
 754         /* Reverse direction key for zone_map. The zone_map only
 755          * has them listed in one direction, so we check both
 756          * directions here. */
 757         const rev = dest + "_" +  src;
 758
 759         /* The default. Obviously wrong for when we don't
 760          * have the necessary data. */
 761         let zone = -1;
 762
 763         if (zone_map[fwd]) {
 764           zone = zone_map[fwd];
 765         }
 766         else if (zone_map[rev]) {
 767           zone = zone_map[rev];
 768         }
 769
 770         /* Convert the number to a string */
 771         switch (zone) {
 772           case 1:
 773             return "One Zone";
 774           case 2:
 775             return "Two Zone";
 776           case 3:
 777             return "Three Zone";
 778           case 4:
 779             return "Four Zone";
 780           default:
 781             return null;
 782         }
 783       }
 784
 785
 786       /**
 787        * Compute and set the zone.
 788        *
 789        * We can be given a zone in two ways. First, on Commuter Bus
 790        * tickets, it is given explicitly via the querystring. But
 791        * It can also be specified implicitly via the origin and
 792        * destination on a MARC Train ticket. Here we try both and
 793        * then call set_zone() with the result if something worked.
 794        */
 795       function compute_and_set_zone() {
 796         const params = new URLSearchParams(document.location.search);
 797         const src = params.get("origin");
 798         const dest = params.get("destination");
 799
 800         if (src && dest) {
 801           /* MARC Train. We can assume that compute_marc_zone() doesn't
 802            * return null because that's part of our form validation. */
 803           const zone = compute_marc_zone(src, dest);
 804           set_zone(zone);
 805         }
 806         else if (params.get("zone")) {
 807           /* Commuter Bus */
 808           set_zone(params.get("zone"));
 809         }
 810       }
 811
 812
 813       /**
 814        * Set the origin and destination for the MARC Train if they
 815        * were provided, and unhide them if so.
 816        */
 817       function set_marc_origin_destination() {
 818         const params = new URLSearchParams(document.location.search);
 819         if (!params.get("origin") || !params.get("destination")) {
 820           return;
 821         }
 822
 823         const src = params.get("origin");
 824         const dest = params.get("destination");
 825
 826         /* origindest contains both the origin and destination */
 827         const origindest = document.getElementById("origindest");
 828
 829         const origin = document.getElementById("origin");
 830         const destination = document.getElementById("destination");
 831
 832         origin.textContent = params.get("origin");
 833         destination.textContent = params.get("destination");
 834
 835         origindest.style.display = "block"; /* hidden by default */
 836       }
 837
 838
 839       /**
 840        * Hide the menu and display the ticket. This is what happens
 841        * when you submit the form.
 842        */
 843       function go() {
 844         /* To create our "window" onto the scene, we're going to slide the
 845          * SVG off the left-hand side of the screen, and we don't want
 846          * scroll bars to appear. */
 847         document.body.style.overflow = "hidden";
 848         document.body.style.margin = "0";
 849         document.body.style.padding = "0";
 850
 851         const svg = document.querySelector("svg");
 852         const menu = document.getElementById("menu");
 853         svg.style.display = "initial";
 854         menu.style.display = "none";
 855       }
 856
 857       /**
 858        * Determine if the user agent is mobile Firefox.
 859        */
 860       function ua_is_mobile_ff() {
 861         const ua = navigator.userAgent.toLowerCase();
 862         return (ua.includes("firefox") && ua.includes("mobile"));
 863       }
 864
 865       /**
 866        * Validate the MARC form's origin/destination.
 867        *
 868        * We don't want the user to be able to choose a pair of stops that
 869        * aren't actually connected by the same MARC line. If we don't have
 870        * zone information for the (origin,destination) pair, that indicates
 871        * that it's probably not a valid choice; otherwise I would have
 872        * filled in the information from the CharmPass app already.
 873        *
 874        * All browsers except mobile Firefox let us call setCustomValidity()
 875        * to provide an error message that is displayed if the user tries
 876        * to submit invalid choices. But amazingly, mobile Firefox does not:
 877        *
 878        *   https://bugzilla.mozilla.org/show_bug.cgi?id=1510450
 879        *
 880        * Instead we have to work around it (in that one browser) by
 881        * showing/hiding a paragraph that we fill with the errors.
 882        */
 883       function validate_origin_destination(event) {
 884         const origins = document.getElementsByName("origin");
 885         const destinations = document.getElementsByName("destination");
 886         const mfe = document.getElementById("marc-form-errors");
 887         const marcsubmit = document.getElementById("marc-submit");
 888
 889         if (ua_is_mobile_ff()) {
 890           /* Even though this is only for one browser, empty paragraphs
 891            * are handled inconsistently and should be avoided as a rule.
 892            * So, we make it say "OK" before we hide it. */
 893           mfe.textContent = "OK";
 894           mfe.style.visibility = "hidden";
 895           marcsubmit.disabled = false;
 896         }
 897
 898         let src = null;
 899         let dest = null;
 900         origins.forEach((x) => { if (x.checked) src = x; })
 901         destinations.forEach((x) => {
 902           if (x.checked) dest = x;
 903
 904           /* clear all errors before possibly setting one */
 905           x.setCustomValidity('');
 906         })
 907
 908         if (src.value === dest.value) {
 909           let err = "Origin and destination are the same";
 910           dest.setCustomValidity(err);
 911
 912           if (ua_is_mobile_ff()) {
 913             mfe.textContent = err;
 914             mfe.style.visibility = "visible";
 915             marcsubmit.disabled = true;
 916           }
 917         }
 918         else if (compute_marc_zone(src.value, dest.value) === null) {
 919           let err = "Origin and destination are on different lines";
 920           dest.setCustomValidity(err);
 921
 922           if (ua_is_mobile_ff()) {
 923             mfe.textContent = err;
 924             mfe.style.visibility = "visible";
 925             marcsubmit.disabled = true;
 926           }
 927         }
 928       }
 929
 930       /*****************************************************/
 931       /* Add event handlers for all of the functions above */
 932       /*****************************************************/
 933
 934       const params = new URLSearchParams(document.location.search);
 935       if (params.get("go")) {
 936         /* First unhide the SVG (swap it with the form) */
 937         window.addEventListener("load", go);
 938
 939         /* Center the ticket once when the page has loaded */
 940         window.addEventListener("load", center_ticket);
 941
 942         /* Re-center the ticket when the window is resized */
 943         window.addEventListener("resize", center_ticket);
 944
 945         /* Set the service identifier when the page has loaded */
 946         window.addEventListener("load", set_service_id);
 947
 948         /* Set the service name when the page has loaded */
 949         window.addEventListener("load", set_service_name);
 950
 951         /* Resize the ticket background if necessary */
 952         window.addEventListener("load", resize_ticket);
 953
 954         /* Set the security code text when the page has loaded */
 955         window.addEventListener("load", set_code);
 956
 957         /* Center the security code text when the page has loaded; in
 958          * particular, after we set the code. */
 959         window.addEventListener("load", center_code);
 960
 961         /* Set the ticket expiration date/time upon page load */
 962         window.addEventListener("load", set_ticket_expiry);
 963
 964         /* Set the MARC Train origin and destination, if applicable */
 965         window.addEventListener("load", set_marc_origin_destination);
 966
 967         /* Compute and set the zone, if applicable */
 968         window.addEventListener("load", compute_and_set_zone);
 969
 970         /* Swap colors when the screen is tapped */
 971         document.body.addEventListener("click", swap_day_night);
 972       }
 973       else {
 974         /* If we haven't submitted the form yet, set up change handlers
 975          * for the origin/destination radio buttons that validate that
 976          * the origin and destination are on the same line. */
 977         document.getElementsByName("origin").forEach(
 978          (x) => x.addEventListener("change", validate_origin_destination)
 979         );
 980         document.getElementsByName("destination").forEach(
 981          (x) => x.addEventListener("change", validate_origin_destination)
 982         );
 983
 984         /* Also do it when the page loads, because firefox likes to
 985          * remember your selection even after the page reloads. */
 986         window.addEventListener("load", validate_origin_destination);
 987
 988         /* Finally, we have to babysit mobile Firefox, who doesn't
 989          * support HTML5 form validation going into 2024. Turn on
 990          * the little form errors paragraph so we can toggle its
 991          * visibility (and make it display the error) when the user
 992          * makes an invalid selection. */
 993         window.addEventListener("load", () => {
 994           if (ua_is_mobile_ff()) {
 995             const mfe = document.getElementById("marc-form-errors");
 996             mfe.style.display = "block";
 997           }
 998         });
 999       }
1000
1001     </script>
1002   </body>
1003 </html>