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javascript - 将 anchor id 和按钮 id 传递给 jquery

转载 作者：行者123 更新时间：2023-12-03 05:25:32 25 4
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我有这段代码，它对于一个 block 来说效果很好，并将 div 元素保存为图像。我正在使用 html5 Canvas 。如果我有 n 个具有唯一 id 的此类 div，我如何实现将 id 和其他变量传递给 jquery。

下面是我的代码:- 

<body>
<div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div>

<div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div><div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div>


<div class="html-content-holder" style="background-color: #F0F0F1; color: #00cc65; width: 500px;
        padding-left: 25px; padding-top: 10px;">
        <strong>Codepedia.info</strong><hr/>
        <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview"/>
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div>



<script>
$(document).ready(function(){
var getCanvas; // global variable
 $(".btn-Preview-Image").on('click', function () {
    element=$('.html-content-holder');
//  getCanvas;
    preview= element.find(".previewImage");
     html2canvas(element, {
     onrendered: function (canvas) {
                $(".previewImage").append(canvas);
                getCanvas = canvas;
             }
         });
    });

    $(".btn-Convert-Html2Image").on('click', function () {
    var imgageData = getCanvas.toDataURL("image/png");
    var newData = imgageData.replace(/^data:image\/png/, "data:application/octet-stream");
    $(".btn-Convert-Html2Image").attr("download", "your_pic_name.png").attr("href", newData);
});

});

</script>
</body>

最佳答案

标记:你必须为每个重复的组添加一个父div并将ID更改为class，然后使用find进行查询。 

    <div class="block-holder">
    <div class="html-content-holder" style="">
      <strong>Codepedia.info</strong>
      <hr/>
      <h3 style="color: #3e4b51;">
            Html to canvas, and canvas to proper image
        </h3>

    </div>
    <input class="btn-Preview-Image" type="button" value="Preview" />
    <a class="btn-Convert-Html2Image" href="#">Download</a>
    <br/>
    <h3>Preview :</h3>
    <div class="previewImage">
    </div> 
  </div>

脚本

$(document).ready(function() {
    $(".btn-Preview-Image").on('click', function() {
    parent = $(this).closest('.block-holder');
    element=parent.find('.html-content-holder')
    //  getCanvas;
    console.log(parent,element);
    preview = element.find(".previewImage");
    html2canvas(element, {
      onrendered: function(canvas) {
        $(".previewImage").html(canvas);

      }
    });
  });

  $(".btn-Convert-Html2Image").on('click', function() {
   parent = $(this).closest('.block-holder');
   getCanvas = parent.find('canvas')[0];
   console.log(parent,getCanvas)
    var imgageData = getCanvas.toDataURL("image/png");
    var newData = imgageData.replace(/^data:image\/png/, "data:application/octet-stream");
    $(".btn-Convert-Html2Image").attr("download", "your_pic_name.png").attr("href", newData);
  });

});

您可以看到 preview= element.find(".previewImage")，对 getcanvas 变量和其他变量使用相同的技术。

这里正在运行 fiddle https://jsfiddle.net/5cfz2ufp/10/

关于javascript - 将 anchor id 和按钮 id 传递给 jquery，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41156878/

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