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jquery implements color picking function

小云云Original: 2018-01-23 09:39:551452browse

We know that ps has a color disappearing function. This article mainly introduces examples of jquery imitating the color picking function of ps, which has a good reference value. Let's take a look with the editor below, I hope it can help everyone.

1. Effect display

2.html code: index.html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <script src="./jquery-1.12.4.min.js"></script>
</head>
<body>
<img class="source" style="float: left" src="./test2.jpg" alt="">
<p class="color" style="width: 150px;height: 150px;float: left;margin: 50px;background: #eee;"></p>
</body>
</html>

3. Plug-in code:

(function ($) {
 $.fn.pickerColor=function (option) {
  var opt ={
  ck:function () {}
  },_this=this
  opt=$.extend(opt,option);
  _this.on(&#39;click&#39;,function (e) {
  var canvasObj = &#39;<canvas id="canvasPickerColor" style="position: fixed;left: 50000px;top: 500px;"></canvas>&#39;;
  $(&#39;body&#39;).append(canvasObj);
  var cvs = document.getElementById("canvasPickerColor"),ctx =cvs.getContext(&#39;2d&#39;)
  cvs.height=1;cvs.width=1
  var img = new Image();
  img.src=_this.attr(&#39;src&#39;);
  var osX=e.offsetX,osY=e.offsetY
  ctx.drawImage(img,osX,osY,1,1,0,0,1,1);
  var imgData=ctx.getImageData(0,0,1,1);
  console.log(imgData)
  if(opt.ck) opt.ck(imgData.data[0]+&#39;,&#39;+imgData.data[1]+&#39;,&#39;+imgData.data[2]);
  })
 }
 })(jQuery)

3, plug-in call

$(function () {
 $(&#39;.source&#39;).pickerColor({
  ck:function (data) {
  console.log(data)
  $(&#39;.color&#39;).css(&#39;background&#39;,&#39;rgba(&#39;+data+&#39;,1)&#39;)
  }
 })
 })

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