105 lines
4 KiB
Twig
105 lines
4 KiB
Twig
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{% extends "forms/field.html.twig" %}
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{% block prepend %}
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<div id="signature-pad" class="signature-pad">
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<div class="signature-pad--body">
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<canvas></canvas>
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</div>
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<div class="signature-pad--footer">
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<div class="description">Sign above</div>
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<div class="signature-pad--actions">
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<div>
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<button type="button" class="btn btn-primary-border" data-action="clear">Clear Signature</button>
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</div>
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</div>
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</div>
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</div>
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<script src="{{ url('plugin://form/assets/signature_pad.js') }}"></script>
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<script>
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var wrapper = document.getElementById("signature-pad");
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var clearButton = wrapper.querySelector("[data-action=clear]");
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var canvas = wrapper.querySelector("canvas");
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var signaturePad = new SignaturePad(canvas, {
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// It's Necessary to use an opaque color when saving image as JPEG;
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// this option can be omitted if only saving as PNG or SVG
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backgroundColor: 'rgb(255, 255, 255)',
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onEnd: function() {
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var input = document.querySelector('[name="data[{{ field.name }}]"]');
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input.value = this.toDataURL();
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}
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});
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// Adjust canvas coordinate space taking into account pixel ratio,
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// to make it look crisp on mobile devices.
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// This also causes canvas to be cleared.
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function resizeCanvas() {
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// When zoomed out to less than 100%, for some very strange reason,
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// some browsers report devicePixelRatio as less than 1
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// and only part of the canvas is cleared then.
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var ratio = Math.max(window.devicePixelRatio || 1, 1);
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// This part causes the canvas to be cleared
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canvas.width = canvas.offsetWidth * ratio;
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canvas.height = canvas.offsetHeight * ratio;
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canvas.getContext("2d").scale(ratio, ratio);
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// This library does not listen for canvas changes, so after the canvas is automatically
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// cleared by the browser, SignaturePad#isEmpty might still return false, even though the
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// canvas looks empty, because the internal data of this library wasn't cleared. To make sure
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// that the state of this library is consistent with visual state of the canvas, you
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// have to clear it manually.
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signaturePad.clear();
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}
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// On mobile devices it might make more sense to listen to orientation change,
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// rather than window resize events.
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window.onresize = resizeCanvas;
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resizeCanvas();
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function download(dataURL, filename) {
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var blob = dataURLToBlob(dataURL);
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var url = window.URL.createObjectURL(blob);
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var a = document.createElement("a");
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a.style = "display: none";
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a.href = url;
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a.download = filename;
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document.body.appendChild(a);
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a.click();
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window.URL.revokeObjectURL(url);
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}
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// One could simply use Canvas#toBlob method instead, but it's just to show
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// that it can be done using result of SignaturePad#toDataURL.
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function dataURLToBlob(dataURL) {
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// Code taken from https://github.com/ebidel/filer.js
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var parts = dataURL.split(';base64,');
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var contentType = parts[0].split(":")[1];
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var raw = window.atob(parts[1]);
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var rawLength = raw.length;
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var uInt8Array = new Uint8Array(rawLength);
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for (var i = 0; i < rawLength; ++i) {
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uInt8Array[i] = raw.charCodeAt(i);
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}
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return new Blob([uInt8Array], { type: contentType });
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}
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clearButton.addEventListener("click", function (event) {
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signaturePad.clear();
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});
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</script>
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{% endblock prepend %}
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{% block input_attributes %}
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type="hidden"
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{{ parent() }}
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{% endblock %}
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