tabler/shared/includes/ui/signature.html

{% assign id = include.id | default: 'default' %}

<div class="signature position-relative{% if include.class %} {{ include.class }}{% endif %}">
	{% if include.clear %}
	<div class="position-absolute top-0 end-0 p-2">
		<div class="btn btn-icon" id="signature-{{ id }}-clear" title="Clear signature" data-bs-toggle="tooltip">
			{% include "ui/icon.html" icon="trash" %} 
		</div>
	</div>
	{% endif %}
  <canvas id="signature-{{ id }}" width="{{ include.width | default: 400 }}" height="{{ include.height | default: 400 }}" class="signature-canvas"></canvas>
</div>

{% capture_script %}
<!-- BEGIN SIGNATURE PAD -->
<script>  
  document.addEventListener("{{ include.event | default: 'DOMContentLoaded' }}", function () {
    const canvas = document.getElementById("signature-{{ id }}");

    if (canvas) {
      const signaturePad = new SignaturePad(canvas, {
        backgroundColor: "transparent",
		  penColor: getComputedStyle(canvas).color
      });

		{% if include.clear %}
		document.querySelector("#signature-{{ id }}-clear").addEventListener("click", function () {
		  signaturePad.clear();
		});
		{% endif %}

		function resizeCanvas() {
        const ratio = Math.max(window.devicePixelRatio || 1, 1);

		  console.log(canvas.offsetWidth, canvas.offsetHeight);

        canvas.width = canvas.offsetWidth * ratio;
        canvas.height = canvas.offsetHeight * ratio;
        canvas.getContext("2d").scale(ratio, ratio);
        signaturePad.fromData(signaturePad.toData()); 
      }  

		window.addEventListener("resize", resizeCanvas);
		resizeCanvas();

		{% if include.extra-js %}
		{{ include.extra-js }}
		{% endif %}
    }
  });
</script>
{% endcapture_script %}