title: Two signature adding not working
body: <p>This is a simple Jquery or Javascript problem. When I add one signature it works fine, but a 2nd signature on the same page is not working. Can you please fix the error? </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>var wrapper = document.getElementById("signature-pad1"),
    clearButton = wrapper.querySelector("[data-action=clear]"),
    saveButton = wrapper.querySelector("[data-action=save]"),
    canvas = wrapper.querySelector("canvas"),
    signaturePad;
  
  function resizeCanvas() {
    var ratio = Math.max(window.devicePixelRatio || 1, 1);
    canvas.width = canvas.offsetWidth * ratio;
    canvas.height = canvas.offsetHeight * ratio;
    canvas.getContext("2d").scale(ratio, ratio);
  }
  
  window.onresize = resizeCanvas;
  resizeCanvas();
  
  signaturePad = new SignaturePad(canvas);
  
  clearButton.addEventListener("click", function(event) {
    signaturePad.clear();
  });
  
  saveButton.addEventListener("click", function(event) {
    if (signaturePad.isEmpty()) {
      alert("Please provide signature first.");
    } else {
      window.open(signaturePad.toDataURL());
    }
  });
  
  // second signature</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.m-signature-pad {
    position: relative;
    font-size: 10px;
    width: 500px;
    height: 250px;
    margin-top: 30px;
    margin-left: 10px;
    border: 1px solid #909090;
    background-color: #fff;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.08) inset;
    border-radius: 4px;
  }
  .m-signature-pad:before,
  .m-signature-pad:after {
    position: absolute;
    z-index: -1;
    content: "";
    width: 40%;
    height: 10px;
    left: 20px;
    bottom: 10px;
    background: transparent;
    -webkit-transform: skew(-3deg) rotate(-3deg);
    -moz-transform: skew(-3deg) rotate(-3deg);
    -ms-transform: skew(-3deg) rotate(-3deg);
    -o-transform: skew(-3deg) rotate(-3deg);
    transform: skew(-3deg) rotate(-3deg);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.4);
  }
  .m-signature-pad:after {
    left: auto;
    right: 20px;
    -webkit-transform: skew(3deg) rotate(3deg);
    -moz-transform: skew(3deg) rotate(3deg);
    -ms-transform: skew(3deg) rotate(3deg);
    -o-transform: skew(3deg) rotate(3deg);
    transform: skew(3deg) rotate(3deg);
  }
  .m-signature-pad--body {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 20px;
    bottom: 60px;
    border: 1px solid #606060;
  }
  .m-signature-pad--body canvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.02) inset;
  }
  .m-signature-pad--footer {
    position: absolute;
    left: 20px;
    right: 20px;
    bottom: 20px;
    height: 40px;
  }
  .m-signature-pad--footer .description {
    color: #C3C3C3;
    text-align: center;
    font-size: 1.2em;
    margin-top: 1.8em;
  }
  .m-signature-pad--footer .button {
    position: absolute;
    bottom: 0;
  }
  .m-signature-pad--footer .button.clear {
    left: 0;
  }
  .m-signature-pad--footer .button.save {
    right: 0;
  }
  @media screen and (max-width: 1024px) {
    .m-signature-pad {
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      width: auto;
      height: auto;
      min-width: 250px;
      min-height: 140px;
      margin: 5%;
    }
    #github {
      display: none;
    }
  }
  @media screen and (min-device-width: 768px) and (max-device-width: 1024px) {
    .m-signature-pad {
      margin: 10%;
    }
  }
  @media screen and (max-height: 320px) {
    .m-signature-pad--body {
      left: 0;
      right: 0;
      top: 0;
      bottom: 32px;
    }
    .m-signature-pad--footer {
      left: 20px;
      right: 20px;
      bottom: 4px;
      height: 28px;
    }
    .m-signature-pad--footer .description {
      font-size: 1em;
      margin-top: 1em;
    }
  }
  .red {
    color: #fa0312;
  }
  .normal-color {
    color: #202020;
  }
  .signs-box {
    padding: 1px 10px 10px 20px;
    border: 1px solid #D8D8D8;
  }
  .signs-box h3 {
    display: block;
    font-size: 14px;
    text-transform: uppercase!important;
  }
  .signs-box img {
    max-width: 100%;
  }
  #progress-bar {
    z-index: 8888888888888888!important;
    top: 0px!important;
  }
  .number-visard {
    padding-bottom: 30px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="http://secure.ascconnect.com/demov4/kiosk/sign/signature_pad.js"&gt;&lt;/script&gt;
  &lt;div id="signature-pad1" class="m-signature-pad"&gt;
    &lt;div class="m-signature-pad--body"&gt;
      &lt;canvas&gt;&lt;/canvas&gt;
    &lt;/div&gt;
    &lt;div class="m-signature-pad--footer"&gt;
      &lt;div class="description"&gt;Sign above&lt;/div&gt;
      &lt;button type="button" class="button clear" data-action="clear"&gt;Clear&lt;/button&gt;
      &lt;button type="button" class="button save" data-action="save"&gt;Save&lt;/button&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  
  &lt;hr&gt;
  
  
  &lt;div id="signature-pad2" class="m-signature-pad"&gt;
    &lt;div class="m-signature-pad--body"&gt;
      &lt;canvas&gt;&lt;/canvas&gt;
    &lt;/div&gt;
    &lt;div class="m-signature-pad--footer"&gt;
      &lt;div class="description"&gt;Sign above&lt;/div&gt;
      &lt;button type="button" class="button clear" data-action="clear"&gt;Clear&lt;/button&gt;
      &lt;button type="button" class="button save" data-action="save"&gt;Save&lt;/button&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>When I repeat the code, the second signature box works but the first box doesn't.</p>