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: that transit equity y'all
  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 23s 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 17s 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 11s 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 40s linear infinite;
 139       }
 140
 141       @keyframes cloudscopyfloat {
 142         from { transform: translateX(0%);   }
 143         to   { transform: translateX(-50%); }
 144       }
 145
 146       #cloudscopy {
 147         animation: cloudscopyfloat 40s 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 30s 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 30s 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 35s 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 35s linear infinite;
 194       }
 195     </style>
 196   </head>
 197
 198   <body>
 199     <div id="menu">
 200       <h1>CharmBypass</h1>
 201       <h2>that transit equity y'all</h2>
 202
 203       <p>
 204         <em>Hint:</em> If they start checking it, the daily security
 205         code stays the same all day and is the same on a $2 bus ticket
 206         as it is on a $9 MARC ticket. It's also the same on every phone.
 207       </p>
 208
 209       <form>
 210         <fieldset>
 211           <legend>Local Bus, Light Rail, or Metro</legend>
 212           <div>
 213             <label for="code1">
 214               Daily security code (optional):
 215             </label>
 216             <input id="code1"
 217                    name="code"
 218                    type="text"
 219                    size="2"
 220                    minlength="2"
 221                    maxlength="2"
 222                    pattern="[a-zA-Z0-9]*" />
 223           </div>
 224           <input type="hidden" name="servicename" value="BaltimoreLink" />
 225           <input type="submit" name="go" value="Generate Ticket" />
 226         </fieldset>
 227       </form>
 228       <form>
 229         <fieldset>
 230           <legend>Commuter Bus</legend>
 231           <input type="hidden" name="serviceid" value="R" />
 232           <input type="hidden" name="servicename" value="Commuter Bus" />
 233
 234           <div>
 235             <label for="code2">
 236               Daily security code (optional):
 237             </label>
 238             <input id="code2"
 239                    name="code"
 240                    type="text"
 241                    size="2"
 242                    minlength="2"
 243                    maxlength="2"
 244                    pattern="[a-zA-Z0-9]*" />
 245           </div>
 246
 247           <p>Zone:</p>
 248           <div>
 249             <input type="radio" required
 250                    name="zone"
 251                    id="zone1"
 252                    value="Zone 1" />
 253             <label for="zone1">Zone 1</label>
 254           </div>
 255           <div>
 256             <input type="radio" required
 257                    name="zone"
 258                    id="zone2"
 259                    value="Zone 2" />
 260             <label for="zone2">Zone 2</label>
 261           </div>
 262           <div>
 263             <input type="radio" required checked
 264                    name="zone"
 265                    id="zone3"
 266                    value="Zone 3" />
 267             <label for="zone3">Zone 3</label>
 268           </div>
 269           <div>
 270             <input type="radio" required
 271                    name="zone"
 272                    id="zone4"
 273                    value="Zone 4" />
 274             <label for="zone4">Zone 4</label>
 275           </div>
 276           <div>
 277             <input type="radio" required
 278                    name="zone"
 279                    id="zone5"
 280                    value="Zone 5" />
 281             <label for="zone5">Zone 5</label>
 282           </div>
 283
 284           <input type="submit" name="go" value="Generate Ticket" />
 285         </fieldset>
 286       </form>
 287       <form>
 288         <fieldset>
 289           <legend>MARC Train</legend>
 290
 291           <div>
 292             <label for="code3">
 293               Daily security code (optional):
 294             </label>
 295             <input id="code3"
 296                    name="code"
 297                    type="text"
 298                    size="2"
 299                    minlength="2"
 300                    maxlength="2"
 301                    pattern="[a-zA-Z0-9]*" />
 302           </div>
 303
 304           <p>Origin:</p>
 305           <div>
 306             <input type="radio" required checked
 307                    name="origin"
 308                    id="origin1"
 309                    value="BAL" />
 310             <label for="origin1">Baltimore/Penn (Penn Line)</label>
 311           </div>
 312           <div>
 313             <input type="radio" required
 314                    name="origin"
 315                    id="origin2"
 316                    value="BCA" />
 317             <label for="origin2">Baltimore/Camden (Camden Line)</label>
 318           </div>
 319           <div>
 320             <input type="radio" required
 321                    name="origin"
 322                    id="origin3"
 323                    value="BWE" />
 324             <label for="origin3">Bowie State (Penn Line)</label>
 325           </div>
 326           <div>
 327             <input type="radio" required
 328                    name="origin"
 329                    id="origin4"
 330                    value="BWI" />
 331             <label for="origin4">BWI Airport (Penn Line)</label>
 332           </div>
 333           <div>
 334             <input type="radio" required
 335                    name="origin"
 336                    id="origin5"
 337                    value="CPK" />
 338             <label for="origin5">College Park (Camden Line)</label>
 339           </div>
 340           <div>
 341             <input type="radio" required
 342                    name="origin"
 343                    id="origin6"
 344                    value="SEB" />
 345             <label for="origin6">Seabrook (Penn Line)</label>
 346           </div>
 347           <div>
 348             <input type="radio" required
 349                    name="origin"
 350                    id="origin7"
 351                    value="WAS" />
 352             <label for="origin7">Washington D.C.</label>
 353           </div>
 354           <div>
 355             <input type="radio" required
 356                    name="origin"
 357                    id="origin8"
 358                    value="WBL" />
 359             <label for="origin8">West Baltimore (Penn Line)</label>
 360           </div>
 361
 362           <p>Destination:</p>
 363           <div>
 364             <input type="radio" required
 365                    name="destination"
 366                    id="destination1"
 367                    value="BAL" />
 368             <label for="destination1">Baltimore/Penn (Penn Line)</label>
 369           </div>
 370           <div>
 371             <input type="radio" required
 372                    name="destination"
 373                    id="destination2"
 374                    value="BCA" />
 375             <label for="destination2">Baltimore/Camden (Camden Line)</label>
 376           </div>
 377           <div>
 378             <input type="radio" required
 379                    name="destination"
 380                    id="destination3"
 381                    value="BWE" />
 382             <label for="destination3">Bowie State (Penn Line)</label>
 383           </div>
 384           <div>
 385             <input type="radio" required
 386                    name="destination"
 387                    id="destination4"
 388                    value="BWI" />
 389             <label for="destination4">BWI Airport (Penn Line)</label>
 390           </div>
 391           <div>
 392             <input type="radio" required
 393                    name="destination"
 394                    id="destination5"
 395                    value="CPK" />
 396             <label for="destination5">College Park (Camden Line)</label>
 397           </div>
 398           <div>
 399             <input type="radio" required
 400                    name="destination"
 401                    id="destination6"
 402                    value="SEB" />
 403             <label for="destination6">Seabrook (Penn Line)</label>
 404           </div>
 405           <div>
 406             <input type="radio" required checked
 407                    name="destination"
 408                    id="destination7"
 409                    value="WAS" />
 410             <label for="destination7">Washington D.C.</label>
 411           </div>
 412           <div>
 413             <input type="radio" required
 414                    name="destination"
 415                    id="destination8"
 416                    value="WBL" />
 417             <label for="destination8">West Baltimore (Penn Line)</label>
 418           </div>
 419
 420           <p id="marc-form-errors">OK</p>
 421
 422           <input type="hidden" name="serviceid" value="R" />
 423           <input type="hidden" name="servicename" value="MARC Train" />
 424           <input type="submit"
 425                  name="go"
 426                  id="marc-submit"
 427                  value="Generate Ticket" />
 428         </fieldset>
 429       </form>
 430     </div>
 431
 432     @SVGDATA@
 433
 434     <script>
 435
 436       /**
 437        * Center the ticket within the browser by translating the SVG
 438        * until the ticket and the viewport centerlines coincide.
 439        */
 440       function center_ticket() {
 441         /* We're relying on the SVG being the full height of the
 442          * viewport already, and on the aspect ratio being
 443          * preserved. First, find the center of the ticket. */
 444         const r = document.getElementById("ticket").getBoundingClientRect();
 445         const c = r.left + (r.width / 2);
 446
 447         /* That's the center-line of the ticket. We want to move it to
 448          * the center-line of the viewport. */
 449         const vc = document.documentElement.clientWidth / 2;
 450
 451         /* This is how much we need to translate the SVG */
 452         const hdelta = vc - c;
 453
 454         /* But before we can set the absolute left-coordinate of the
 455          * SVG, we need to know where it is now. Note: without the
 456          * "px" this doesn't default to pixels like CSS does. */
 457         const svg = document.querySelector("svg");
 458         svg.style.left = (svg.getBoundingClientRect().left + hdelta) + "px";
 459       }
 460
 461
 462       /**
 463        * Set the service identifier from the querystring if it's there.
 464        * Otherwise, leave it at the default of "F".
 465        */
 466       function set_service_id() {
 467         const sid = document.getElementById("serviceid");
 468
 469         /* Get the "serviceid" from the querystring if it's there */
 470         const params = new URLSearchParams(document.location.search);
 471         if (params.get("serviceid")) {
 472           sid.textContent = params.get("serviceid");
 473         }
 474       }
 475
 476
 477       /**
 478        * Set the service name from the querystring if it's there.
 479        * Otherwise, leave it at the default of "BaltimoreLink".
 480        */
 481       function set_service_name() {
 482         const sid = document.getElementById("servicename");
 483
 484         /* Get the "servicename" from the querystring if it's there */
 485         const params = new URLSearchParams(document.location.search);
 486         if (params.get("servicename")) {
 487           sid.textContent = params.get("servicename");
 488         }
 489       }
 490
 491
 492       /**
 493        * Set the zone from the given "zone" parameter and then unhide it.
 494        */
 495       function set_zone(zone) {
 496         const z = document.getElementById("zone");
 497
 498         z.textContent = zone;
 499         z.style.display = "block"; /* hidden by default */
 500       }
 501
 502
 503       /**
 504        * Resize the  ticket background based on the service name.
 505        * The BaltimoreLink, Commuter Bus, and MARC Train tickets
 506        * are all different heights and are arranged vertically a
 507        * bit different.
 508        *
 509        * Rather than design three completelty separate tickets and
 510        * then have to keep track of which one we're using, I have
 511        * instead decided to use one ticket and to reposition it
 512        * on-the-fly based on the service name. This is necessarily
 513        * a bit ugly because it involves a lot of magic numbers that
 514        * can only be explained if you open up inkscape with a CharmPass
 515        * screenshot to see where things belong and how to get them there.
 516        *
 517        * The SVG was designed with BaltimoreLink in mind, so this
 518        * is a no-op if the service is BaltimoreLink.
 519        */
 520       function resize_ticket() {
 521         /* Get the "servicename" from the querystring if it's there */
 522         const params = new URLSearchParams(document.location.search);
 523         const tbg = document.getElementById("ticketbg");
 524         const t = document.getElementById("ticket");
 525         const sn = document.getElementById("servicename");
 526
 527         if (params.get("servicename") === "Commuter Bus") {
 528           /* The top of the background is initially at y=246.859, and
 529            * we scale it by a factor of 1.12 to y=276.482 for a change
 530            * of 29.623. So after we scale it, we translate it upwards
 531            * by that amount to put it back where it started. */
 532           tbg.setAttribute("transform", "translate(0 -29.623) scale(1 1.12)");
 533
 534           /* Now translate the entire ticket up by the magic amount, 1/5
 535            * of the size change we made to the background. This ratio
 536            * was found by measuring pixels in side-by-side screenshots
 537            * of BaltimoreLink and Commuter Bus tickets. */
 538           t.setAttribute("transform", "translate(0 -9.33)");
 539
 540           /* More magic numbers discovered by comparing the two
 541            * tickets overlayed in inkscape */
 542           sn.setAttribute("transform", "translate(0 64.28)");
 543         }
 544         else if (params.get("servicename") === "MARC Train") {
 545           /* insane tricks are explained above */
 546           tbg.setAttribute("transform",
 547                            "translate(0 -72.378) scale(1 1.2932)");
 548           t.setAttribute("transform", "translate(0 -67.17)");
 549           sn.setAttribute("transform", "translate(0 131.0)");
 550         }
 551       }
 552
 553
 554       /**
 555        * Set the security code from the querystring if it was given;
 556        * otherwise generate a random code.
 557        */
 558       function set_code() {
 559         const ct = document.getElementById("codetext");
 560
 561         /* Get the "code" from the querystring if it's there */
 562         const params = new URLSearchParams(document.location.search);
 563         if (params.get("code")) {
 564           ct.textContent = params.get("code").toUpperCase();
 565         }
 566         else {
 567           /* Otherwise, use a random code */
 568           const bucket = ["0","1","2","3","4","5","6","7","8","9",
 569                           "A","B","C","D","E","F","G","H","I","J",
 570                           "K","L","M","N","O","P","Q","R","S","T",
 571                           "U","V","W","X","Y","Z"];
 572
 573           /* Two random ints between 0 and 35 */
 574           const i1 = Math.floor(Math.random() * 36);
 575           const i2 = Math.floor(Math.random() * 36);
 576           const d1 = bucket[i1];
 577           const d2 = bucket[i2];
 578           ct.textContent = d1 + d2;
 579         }
 580       }
 581
 582
 583       /**
 584        * Center the security code within its container.
 585        *
 586        * Some codes like "II" and "WW" can take up wildly different
 587        * amounts of horizonetal space, but they should always be
 588        * centered inside their little red box. This turns out to be
 589        * harder than it sounds because we can only find the width of
 590        * the code in browser coordinates, whereas its "x" coordinate
 591        * is in SVG coordinates. Anyway, we do it.
 592        */
 593       function center_code() {
 594         /* Center the security code inside its red box */
 595         const ct = document.getElementById("codetext");
 596         const bg = document.getElementById("codebg");
 597
 598         /* First, find the center of the red box */
 599         const r1 = bg.getBoundingClientRect();
 600         const c1 = r1.left + (r1.width / 2);
 601
 602         /* Now the center of the code text */
 603         const r2 = ct.getBoundingClientRect();
 604         const c2 = r2.left + (r2.width / 2);
 605
 606         /* What do we add to c2 to make it equal to c1? */
 607         const hdelta = c1 - c2;
 608
 609         /* We've measured everything so far in "client rect"
 610          * coordinates, because that's the only available measurement
 611          * we have for the width of the <text> element. But when we
 612          * reposition that <text> element, it will be by adjusting its
 613          * "x" attribute, and that attribute uses a different coordinate
 614          * system than the client rect does. Specifically, "x" refers to
 615          * an offset within the SVG's coordinate system, and the client
 616          * rect coordinates are pixels on-screen. To convert between the
 617          * two, we can take the "width" attribute of the background
 618          * element and compare it to the width of the background
 619          * element's client rect. Since the size of the background is
 620          * fixed, this should give us a multiplier that turns client rect
 621          * distances (what we have) into SVG distances (what we want) */
 622         const client_to_svg = parseFloat(bg.getAttribute("width"))/r1.width;
 623
 624         /* Convert hdelta from client rect to SVG coordinates */
 625         const svg_hdelta = hdelta * client_to_svg;
 626
 627         /* Since this <text> element has an "x" attribute it's easier for
 628          * us to shift that than it is to mess with the "left" style. */
 629         ct.setAttribute("x", parseFloat(ct.getAttribute("x")) + svg_hdelta);
 630       }
 631
 632       /**
 633        * Set the ticket's expiration date and time.
 634        *
 635        * BaltimoreLink and MARC Train tickets expire after 90 minutes;
 636        * while Commuter Bus tickets expire after 10 minutes.
 637        */
 638       function set_ticket_expiry() {
 639         /* There are two parameters, time and date, that we store in one
 640          * underlying "date" variable. */
 641         const date = new Date();
 642
 643         /* BaltimoreLink and MARC Train */
 644         let minutes = 90;
 645         const params = new URLSearchParams(document.location.search);
 646         if (params.get("servicename") === "Commuter Bus") {
 647           /* Commuter bus tickets are only valid for ten minutes */
 648           minutes = 10;
 649         }
 650
 651         /* We use the low-level get/setTime to change the number of
 652          * milliseconds since the epoch that this date represents
 653          * Obviously correct, and avoids all suspicious corner cases
 654          * for a few more decades. */
 655         date.setTime(date.getTime() + (minutes*60*1000));
 656
 657         tt = document.getElementById("tickettime");
 658         tt.textContent = date.toLocaleTimeString();
 659
 660         const td = document.getElementById("ticketdate");
 661         const dateopts = {
 662           day: "2-digit",
 663           month: "2-digit",
 664           year: "2-digit"
 665         };
 666         td.textContent = date.toLocaleDateString("en-US", dateopts);
 667       }
 668
 669
 670       /**
 671        * Swap the day/night sky colors.
 672        *
 673        * We use CSS classes to keep track of the current state because
 674        * it's a tiny bit cleaner than a global variable, but for some
 675        * reason we can't use those same classes to actually change the
 676        * color. (The classes, change, but the color doesn't.) Rather
 677        * than waste time trying to explain this, we just set the "fill"
 678        * attribute ourselves whenever we swap classes.
 679        */
 680       function swap_day_night() {
 681         const sky = document.getElementById("sky");
 682
 683         if (sky.getAttribute("class") === "night") {
 684           sky.setAttribute("fill", "#efb02f");
 685           sky.setAttribute("class", "day");
 686         }
 687         else {
 688           /* Put this case second so that the first time the
 689            * screen is tapped (when there are no classes on
 690            * the sky element) the color still changes. */
 691           sky.setAttribute("fill", "#143b66");
 692           sky.setAttribute("class", "night");
 693         }
 694       }
 695
 696
 697       /**
 698        * Compute the zone (string) for the given origin/destination pair.
 699        *
 700        * If we don't know it or if you chose in invalid pair (destination
 701        * not on the same line as your origin?) then null is returned.
 702        */
 703       function compute_marc_zone(src, dest) {
 704
 705         /* Sorted on the first component, then the second */
 706         const zone_map = {
 707           BAL_BWE: 2,
 708           BAL_BWI: 1,
 709           BAL_SEB: 3,
 710           BAL_WAS: 4,
 711           BAL_WBL: 1,
 712           BCA_CPK: 3,
 713           BCA_WAS: 4,
 714           BWE_BWI: 1,
 715           BWE_SEB: 1,
 716           BWE_WAS: 2,
 717           BWE_WBL: 2,
 718           BWI_WAS: 3,
 719           BWI_WBL: 1
 720         };
 721
 722         /* Forward direction key for zone_map */
 723         const fwd = src + "_" +  dest;
 724
 725         /* Reverse direction key for zone_map. The zone_map only
 726          * has them listed in one direction, so we check both
 727          * directions here. */
 728         const rev = dest + "_" +  src;
 729
 730         /* The default. Obviously wrong for when we don't
 731          * have the necessary data. */
 732         let zone = -1;
 733
 734         if (zone_map[fwd]) {
 735           zone = zone_map[fwd];
 736         }
 737         else if (zone_map[rev]) {
 738           zone = zone_map[rev];
 739         }
 740
 741         /* Convert the number to a string */
 742         switch (zone) {
 743           case 1:
 744             return "One Zone";
 745           case 2:
 746             return "Two Zone";
 747           case 3:
 748             return "Three Zone";
 749           case 4:
 750             return "Four Zone";
 751           default:
 752             return null;
 753         }
 754       }
 755
 756
 757       /**
 758        * Compute and set the zone.
 759        *
 760        * We can be given a zone in two ways. First, on Commuter Bus
 761        * tickets, it is given explicitly via the querystring. But
 762        * It can also be specified implicitly via the origin and
 763        * destination on a MARC Train ticket. Here we try both and
 764        * then call set_zone() with the result if something worked.
 765        */
 766       function compute_and_set_zone() {
 767         const params = new URLSearchParams(document.location.search);
 768         const src = params.get("origin");
 769         const dest = params.get("destination");
 770
 771         if (src && dest) {
 772           /* MARC Train. We can assume that compute_marc_zone() doesn't
 773            * return null because that's part of our form validation. */
 774           const zone = compute_marc_zone(src, dest);
 775           set_zone(zone);
 776         }
 777         else if (params.get("zone")) {
 778           /* Commuter Bus */
 779           set_zone(params.get("zone"));
 780         }
 781       }
 782
 783
 784       /**
 785        * Set the origin and destination for the MARC Train if they
 786        * were provided, and unhide them if so.
 787        */
 788       function set_marc_origin_destination() {
 789         const params = new URLSearchParams(document.location.search);
 790         if (!params.get("origin") || !params.get("destination")) {
 791           return;
 792         }
 793
 794         const src = params.get("origin");
 795         const dest = params.get("destination");
 796
 797         /* origindest contains both the origin and destination */
 798         const origindest = document.getElementById("origindest");
 799
 800         const origin = document.getElementById("origin");
 801         const destination = document.getElementById("destination");
 802
 803         origin.textContent = params.get("origin");
 804         destination.textContent = params.get("destination");
 805
 806         origindest.style.display = "block"; /* hidden by default */
 807       }
 808
 809
 810       /**
 811        * Hide the menu and display the ticket. This is what happens
 812        * when you submit the form.
 813        */
 814       function go() {
 815         /* To create our "window" onto the scene, we're going to slide the
 816          * SVG off the left-hand side of the screen, and we don't want
 817          * scroll bars to appear. */
 818         document.body.style.overflow = "hidden";
 819         document.body.style.margin = "0";
 820         document.body.style.padding = "0";
 821
 822         const svg = document.querySelector("svg");
 823         const menu = document.getElementById("menu");
 824         svg.style.display = "initial";
 825         menu.style.display = "none";
 826       }
 827
 828       /**
 829        * Determine if the user agent is mobile Firefox.
 830        */
 831       function ua_is_mobile_ff() {
 832         const ua = navigator.userAgent.toLowerCase();
 833         return (ua.includes("firefox") && ua.includes("mobile"));
 834       }
 835
 836       /**
 837        * Validate the MARC form's origin/destination.
 838        *
 839        * We don't want the user to be able to choose a pair of stops that
 840        * aren't actually connected by the same MARC line. If we don't have
 841        * zone information for the (origin,destination) pair, that indicates
 842        * that it's probably not a valid choice; otherwise I would have
 843        * filled in the information from the CharmPass app already.
 844        *
 845        * All browsers except mobile Firefox let us call setCustomValidity()
 846        * to provide an error message that is displayed if the user tries
 847        * to submit invalid choices. But amazingly, mobile Firefox does not:
 848        *
 849        *   https://bugzilla.mozilla.org/show_bug.cgi?id=1510450
 850        *
 851        * Instead we have to work around it (in that one browser) by
 852        * showing/hiding a paragraph that we fill with the errors.
 853        */
 854       function validate_origin_destination(event) {
 855         const origins = document.getElementsByName("origin");
 856         const destinations = document.getElementsByName("destination");
 857         const mfe = document.getElementById("marc-form-errors");
 858         const marcsubmit = document.getElementById("marc-submit");
 859
 860         if (ua_is_mobile_ff()) {
 861           /* Even though this is only for one browser, empty paragraphs
 862            * are handled inconsistently and should be avoided as a rule.
 863            * So, we make it say "OK" before we hide it. */
 864           mfe.textContent = "OK";
 865           mfe.style.visibility = "hidden";
 866           marcsubmit.disabled = false;
 867         }
 868
 869         let src = null;
 870         let dest = null;
 871         origins.forEach((x) => { if (x.checked) src = x; })
 872         destinations.forEach((x) => {
 873           if (x.checked) dest = x;
 874
 875           /* clear all errors before possibly setting one */
 876           x.setCustomValidity('');
 877         })
 878
 879         if (src.value === dest.value) {
 880           let err = "Origin and destination are the same";
 881           dest.setCustomValidity(err);
 882
 883           if (ua_is_mobile_ff()) {
 884             mfe.textContent = err;
 885             mfe.style.visibility = "visible";
 886             marcsubmit.disabled = true;
 887           }
 888         }
 889         else if (compute_marc_zone(src.value, dest.value) === null) {
 890           let err = "Origin and destination are on different lines";
 891           dest.setCustomValidity(err);
 892
 893           if (ua_is_mobile_ff()) {
 894             mfe.textContent = err;
 895             mfe.style.visibility = "visible";
 896             marcsubmit.disabled = true;
 897           }
 898         }
 899       }
 900
 901       /*****************************************************/
 902       /* Add event handlers for all of the functions above */
 903       /*****************************************************/
 904
 905       const params = new URLSearchParams(document.location.search);
 906       if (params.get("go")) {
 907         /* First unhide the SVG (swap it with the form) */
 908         window.addEventListener("load", go);
 909
 910         /* Center the ticket once when the page has loaded */
 911         window.addEventListener("load", center_ticket);
 912
 913         /* Re-center the ticket when the window is resized */
 914         window.addEventListener("resize", center_ticket);
 915
 916         /* Set the service identifier when the page has loaded */
 917         window.addEventListener("load", set_service_id);
 918
 919         /* Set the service name when the page has loaded */
 920         window.addEventListener("load", set_service_name);
 921
 922         /* Resize the ticket background if necessary */
 923         window.addEventListener("load", resize_ticket);
 924
 925         /* Set the security code text when the page has loaded */
 926         window.addEventListener("load", set_code);
 927
 928         /* Center the security code text when the page has loaded; in
 929          * particular, after we set the code. */
 930         window.addEventListener("load", center_code);
 931
 932         /* Set the ticket expiration date/time upon page load */
 933         window.addEventListener("load", set_ticket_expiry);
 934
 935         /* Set the MARC Train origin and destination, if applicable */
 936         window.addEventListener("load", set_marc_origin_destination);
 937
 938         /* Compute and set the zone, if applicable */
 939         window.addEventListener("load", compute_and_set_zone);
 940
 941         /* Swap colors when the screen is tapped */
 942         document.body.addEventListener("click", swap_day_night);
 943       }
 944       else {
 945         /* If we haven't submitted the form yet, set up change handlers
 946          * for the origin/destination radio buttons that validate that
 947          * the origin and destination are on the same line. */
 948         document.getElementsByName("origin").forEach(
 949          (x) => x.addEventListener("change", validate_origin_destination)
 950         );
 951         document.getElementsByName("destination").forEach(
 952          (x) => x.addEventListener("change", validate_origin_destination)
 953         );
 954
 955         /* Also do it when the page loads, because firefox likes to
 956          * remember your selection even after the page reloads. */
 957         window.addEventListener("load", validate_origin_destination);
 958
 959         /* Finally, we have to babysit mobile Firefox, who doesn't
 960          * support HTML5 form validation going into 2024. Turn on
 961          * the little form errors paragraph so we can toggle its
 962          * visibility (and make it display the error) when the user
 963          * makes an invalid selection. */
 964         window.addEventListener("load", () => {
 965           if (ua_is_mobile_ff()) {
 966             const mfe = document.getElementById("marc-form-errors");
 967             mfe.style.display = "block";
 968           }
 969         });
 970       }
 971
 972     </script>
 973   </body>
 974 </html>