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    Simple signature pad

    3rd November 2018

    Jquery - Tricks

    jquery icon

    Works out of the box…..

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    <div id="signature-pad" class="m-signature-pad">
      <div class="m-signature-pad--body">
        <canvas></canvas>
      </div>
    </div>
     
      <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
     
      <script src="https://cdnjs.cloudflare.com/ajax/libs/signature_pad/1.3.4/signature_pad.min.js"></script>
     
    <style type="text/css">
    body {
      font-family: Helvetica, Sans-Serif;
     
      -moz-user-select: none;
      -webkit-user-select: none;
      -ms-user-select: none;
    }
     
    .m-signature-pad {
      position: relative;
      font-size: 10px;
      width: 400px;
      height: 400px;
      border: 1px solid #e8e8e8;
      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: 20px;
      border: 1px solid #f4f4f4;
    }
     
    .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;
      }
     
    @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: 250px;
        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;
        }
    }
     
    </style>
     
    <button id="replace">Get data</button>
     
     
     
     
    <script type="text/javascript">
    var w = document.getElementById("signature-pad"),
        c = w.querySelector("canvas"),
        b = document.getElementById("replace");
     
    function resizeCanvas(canvas) {
        var ratio =  window.devicePixelRatio || 1;
        canvas.width = canvas.offsetWidth * ratio;
        canvas.height = canvas.offsetHeight * ratio;
        canvas.getContext("2d").scale(ratio, ratio);
    }
     
    resizeCanvas(c);
     
    console.log("devicePixelRatio: " + window.devicePixelRatio);
     
    var data;
    var signaturePad = new SignaturePad(c);
     
    b.onclick = function () {
        data = signaturePad.toDataURL();
     
     
        alert(data);
        
        signaturePad.clear();
        setTimeout(function () {
            window.open(data);
            signaturePad.fromDataURL(data);
        }, 1000);
        
    };
     
    </script>
     

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