如何将html div转换成图像，然后保存为gif或png格式?

I have tried figuring out a multitude of coded div to image methods on * and across the internet. The codes aren't working for me, because none of methods are exactly what I need and I'm screwing up the code with my modifications to fit what I need.

我尝试过在*和internet上找到大量的编码div到图像方法。代码对我不起作用，因为没有一个方法是我所需要的，我用我的修改把代码搞砸了，以满足我的需要。

Anyway, a few minutes ago I found someone who is actually applying the code to divs that are set up like mine. Please take a look at his/her tool (it's what I am doing just with a few more images):

不管怎样，几分钟前我找到了一个人，他实际上是在用和我一样的代码来创建div。请看看他/她的工具(这是我用更多的图片做的):

http://kpomservices.com/html5canvas/indexsucc.html

http://kpomservices.com/html5canvas/indexsucc.html

and his/her blueprint (source file):

及其蓝图(源文件):

view-source:http://kpomservices.com/html5canvas/indexsucc.html

查看源代码:http://kpomservices.com/html5canvas/indexsucc.html

This is what I did:

这就是我所做的:

1. I copied the scripts from the source file (found after </body> tag):

   我从源文件中复制了脚本(在标签后):

   <script src="js/html2canvas.js"></script> <script src="js/base64.js"></script> <script src="js/canvas2image.js"></script> <script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>

   < script src = " js / html2canvas。js " > < /脚本> < script src = " js / base64。js " > < /脚本> < script src = " js / canvas2image。js " > < /脚本> <脚本type = " text javascript src=" js / jquery-1.4.2.min.js "> < /脚本>

2. I pasted it into my header file above the </head>.

   我将它粘贴到上面的头文件中。

3. I replaced all src="" with complete urls (they aren't hosted on my servers yet, because I'm testing to see if this will even work for me first).
4. 我用完整的url替换了所有src="" "(它们还没有托管在我的服务器上，因为我正在测试这是否会首先对我起作用)。

5. I copied the function script from http://kpomservices.com/HTML_to_Canvas.php:

   我从http://kpomservices.com/HTML_to_Canvas.php复制了函数脚本:

   function convert() {
                   dom = document.getElementById('watch');
   
                   // execute the html2canvas script
                   var script,
                   $this = this,
                   options = this.options,
                   runH2c = function(){
                       try {
                           var canvas =     window.html2canvas([ document.getElementById('watch') ], {
                               onrendered: function( canvas ) {
   
                               /*
                               canvas is the actual canvas element,
                               to append it to the page call for example
                               */
                               window.open(canvas.toDataURL());
                               //document.body.appendChild( canvas );
                               }
                           });
                       } catch( e ) {
                           $this.h2cDone = true;
                           log("Error in html2canvas: " + e.message);
                       }
                   };
   
                   if ( window.html2canvas === undefined && script === undefined ) {
                   } else {.
                       // html2canvas already loaded, just run it then
                       runH2c();
                   }
               }
   

6. I pasted it, as is, between <script></script> tags in the header file.

   我将它粘贴到头文件中的标记之间。

7. I replaced both (2) instances document.getElementById('watch') with my div id name: document.getElementById('captme').

   我用div id名:document.getElementById('watch')替换了(2)两个实例document.getElementById('captme')。

8. I copied and pasted the displaybox styling from the source file and pasted it before the </head> in header file (I also tried adding it to the css file only, but that didn't work, either):

   我复制并粘贴了源文件中的displaybox样式，并在头文件中的之前粘贴了它(我还尝试将它添加到css文件中，但这也不起作用):

   <style>
   #displaybox {
   z-index: 10000;
   filter: alpha(opacity=50); /*older IE*/
   filter:progid:DXImageTransform.Microsoft.Alpha(opacity=50); /* IE */
   -moz-opacity: .50; /*older Mozilla*/
   -khtml-opacity: 0.5;   /*older Safari*/
   opacity: 0.5;   /*supported by current Mozivalidate-textlla, Safari, and Opera*/
   background-color:#000000;
   position:fixed; top:0px; left:0px; width:100%; height:100%; color:#FFFFFF; text-align:center; vertical-align:middle;
   }
   </style>
   

8) I copied and pasted just these two lines from the source file (I don't need the other two buttons) into the index file after <?php get_header(); ?>:

8)我在 :

<div id="displaybox" style="display: none;"></div>
<input type="button" value="View As Image" onClick="javascript:return convert();">

9) I copied and pasted this line from the source file into the index file after the <div id="captme">:

9)在

后，我将这一行从源文件复制粘贴到索引文件中:

<canvas id="localcanvas" style="display:none" width=500 height=500></canvas>

10) All that and nothing works. I can click on the button but it renders nothing.

所有的这些都不起作用。我可以点击按钮，但它什么也不显示。

What went wrong? Thanks for any guidance you share!

到底是哪里出了错?谢谢大家的指导!

2 个解决方案

#1

This is working for me. It renders picture from div solnePuzzle and post to PHP script via ajax post. In PHP script save.php, I base_64 decode and save content via file_put_content to img.

这对我很有效。它从div solnePuzzle呈现图片，并通过ajax post将图片发布到PHP脚本。在PHP脚本中保存。我通过file_put_content解码并将内容保存到img。

html2canvas js

html2canvas js

function capture() {
    $("#solnePuzzle").html2canvas({
        onrendered: function (e) {
            $("#img_val").val(e.toDataURL("image/png"));
            var t = $("#myForm").serializeArray();
            $.ajax({
                url: "save.php",
                type: "POST",
                dataType: "json",
                data: {
                    box: box,
                    form: t
                },
                success: function (e) {
                    alert(e.text)
                }
            })
        }
    })
}

#2

http://jsfiddle.net/8ypxW/3/

http://jsfiddle.net/8ypxW/3/

$(function() { 
    $("#btnSave").click(function() { 
        html2canvas($("#widget"), {
            onrendered: function(canvas) {
                theCanvas = canvas;
                document.body.appendChild(canvas);

                // Convert and download as image 
                Canvas2Image.saveAsPNG(canvas); 
                $("#img-out").append(canvas);
                // Clean up 
                //document.body.removeChild(canvas);
            }
        });
    });
}); 

body {
    font-family: "Lucida Grande", "Lucida Sans", Arial, sans-serif;
    font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;

}

.dataset {
    float: left;
    vertical-align: top;


}

.widget {
    display: inline-block;
    background-color: white;
    font-size: 14px !important;
    line-height: 20px !important;

    margin: 5px;
    vertical-align: top;
    color: #333;

    border-radius: 5px;
    margin: 10px;
    padding-bottom: 20px;
    border: 1px solid lightgray;


    border-radius:5px;
    -webkit-border-radius: 5px;


    display: inline-block;
    page-break-after: always;

}

.widget .header p {
   padding: 10px;
   border-bottom: 1px solid lightgrey;
   max-width: 360px;
}

.widget .header .title {
    font-weight: bold;
    vertical-align: middle;
    min-height: 36px;
    padding: 5px 10px 5px 10px;

}

.widget .header:hover {
    background-color: #f4f4f4;
}

.widget .header  .title.selected {
    border-color: cornflowerblue;
    background-color: #EEF;

}

.widget .content {
    padding: 5px;
    overflow-y: auto;
    max-height: 400px;
}

.autolayout {
    display: inline-block;
}

.element {
    width: 360px;
}

.compact .content {
    display: table;
    width: 100%;
}

.compact .row {
    display: table-row;
    width: 100%;
}

.compact .cell {
    display: table-cell;
}

.compact .row.selected {
    background-color: #eee;
}



.toolbar {
    display: block;
    vertical-align: top;
    margin: 10px;
}

.toolbar .basis {
    min-width: 100px;
}

.btn {
    /*min-width: 60px;*/
}


.cell.value {
    overflow: hidden;
    text-wrap: none;
    white-space: nowrap;
    text-overflow: ellipsis;
    text-align: right;
    padding-right: 10px;
}

.cell.freq {
    width: 60px;
}

.cell.glyph {
    vertical-align: middle;
    width: 100px;
}


.element {

}
.element table {
    table-layout: fixed;
    width: 100%;
}

.element td {
    padding: 0px;

}

.element .selectable:hover {
    background-color: #f4f4f4;
}


.element .stat {
    text-align: right;
    padding-right: 20px;
    font-weigth: bold;
    color: darkgray;
}



.element .bar {
    height: 18px;
    display: inline-block;
    float: left;
}
.bar-both {
    background-color: #0a67a3 !important;

}

.bar-fg {
    background-color: #3e97d1 !important;
}

.bar-bg {
    background-color: #ddd !important;
}

.selected .bar-fg {
    background-color: #FC0;
}

.selected .bar-both  {
    background-color:#FA0;
}

tr.selected {
    background-color: #eee;
}

.crosstab .selectable:hover {
    background-color: #f4f4f4;
}

.crosstab tr.selected {
    background-color: #eee;
}

.crosstab .header p {
    max-width: 600px;
}


.crosstab td {
  padding: 0 5px 0 5px;
  text-align: right;
}

.crosstab td.value {
  min-width: 60px;
  max-width: 240px;
  text-align: left;
}

.crosstab .cell {
    vertical-align: top;
}



.crosstab th.cell {
    max-width: 120px;
    overflow: hidden;
    white-space: normal;
    text-overflow: ellipsis;
    text-align: right;
    padding-right: 10px;
    vertical-align: bottom;
}

.crosstab .n {
    color: darkgray;
}
.fieldlist {
}

.constraints {
    min-width:300px;
    padding: 10px;

    border-radius:5px;
    -webkit-border-radius: 5px;


}
.constraints table {
    width: 100%;

}

.sidenote {
  max-width:300px;
  padding: 0 10px 0px 10px;
  display: inline-block;
  vertical-align: top;
}

.headnote {
    max-width: 600px;
    padding: 10px;
    margin: 10px;
    display: inline-block;
}

.info-block {
    /*border: 1px solid lightgrey;*/
    background-color: #eee;
    vertical-align: top;
    margin: 10px;
    padding: 10px;
    display: block;

    /*box-shadow: 0 0 0 0px #9bc0cf, 0 0 0 3px #e0ebf0;*/
}

.menu-item {
}

.menu-item-value {
    text-align: right;
    float: right;
}

.gradient-blue {
    background: #b8e1fc; /* Old browsers */
    /* IE9 SVG, needs conditional override of 'filter' to 'none' */
    background: url(data:image/svg+xml;base64,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);
    background: -moz-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #b8e1fc), color-stop(10%, #a9d2f3), color-stop(25%, #90bae4), color-stop(37%, #90bcea), color-stop(50%, #90bff0), color-stop(51%, #6ba8e5), color-stop(83%, #a2daf5), color-stop(100%, #bdf3fd)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* IE10+ */
    background: linear-gradient(to bottom, #b8e1fc 0%, #a9d2f3 10%, #90bae4 25%, #90bcea 37%, #90bff0 50%, #6ba8e5 51%, #a2daf5 83%, #bdf3fd 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#b8e1fc', endColorstr='#bdf3fd', GradientType=0); /* IE6-8 */
}

<span id="widget" class="widget" field="AGE" roundby="20" description="Patient age, in years">
    <div class="header ng-scope">
      <div class="title ng-binding">AGE</div>
      <p class="ng-binding">Patient age, in years</p>
    </div>
    <div class="element ng-scope">
      <div ng-show="hasData()" class="content">
        <table ng-model="table" class="ng-pristine ng-valid">
          <colgroup>
            <col/>
            <col width="60x"/>
            <col width="100px"/>
          </colgroup>
          <thead>
            <tr>
              <th class="cell value">Value</th>
              <th class="cell freq">Freq</th>
              <th class="cell value"></th>
            </tr>
          </thead>
          <tbody>
<tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="0" class="selectable ng-scope">
            <td class="cell value"><span tooltip="0 to 19" class="ng-scope ng-binding">0 to 19</span>
            </td>

            <td class="cell freq ng-binding">17.2%</td>
            <td class="cell glyph">
              <span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 17.234468937875754%;"></span>
              <span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
              <span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
            </td>
          </tr><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="20" class="selectable ng-scope">
            <td class="cell value"><span tooltip="20 to 39" class="ng-scope ng-binding">20 to 39</span>
            </td>
            <td class="cell freq ng-binding">18.0%</td>
            <td class="cell glyph">
              <span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 18.03607214428858%;"></span>
              <span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
              <span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
            </td>
          </tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort --><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="40" class="selectable ng-scope">
            <td class="cell value"><span tooltip="40 to 59" class="ng-scope ng-binding">40 to 59</span>
            </td>

            <!--<td >{{table.getRowPercent('current', rowKey) | percent}}</td>-->
            <td class="cell freq ng-binding">34.3%</td>
            <td class="cell glyph">
              <!--<div class="bar bar-both" style="width: {{(row.current.pct * 100)||2}}px; " ></div>-->
              <span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 34.2685370741483%;"></span>
              <span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
              <span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
            </td>
          </tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort --><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="60" class="selectable ng-scope">
            <td class="cell value"><span tooltip="60 to 79" class="ng-scope ng-binding">60 to 79</span>
            </td>

            <!--<td >{{table.getRowPercent('current', rowKey) | percent}}</td>-->
            <td class="cell freq ng-binding">24.0%</td>
            <td class="cell glyph">
              <!--<div class="bar bar-both" style="width: {{(row.current.pct * 100)||2}}px; " ></div>-->
              <span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 24.04809619238477%;"></span>
              <span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
              <span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
            </td>
          </tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort --><tr ng-repeat="rowKey in table.rowKeys | orderBy:elementRowSort " ng-click="onSelect(rowKey, $event.shiftKey)" ng-class="{true:'selected'}[isSelected(rowKey)]" data-key="80" class="selectable ng-scope">
            <td class="cell value"><span tooltip="80 to 99" class="ng-scope ng-binding">80 to 99</span>
            </td>

            <!--<td >{{table.getRowPercent('current', rowKey) | percent}}</td>-->
            <td class="cell freq ng-binding">6.4%</td>
            <td class="cell glyph">
              <!--<div class="bar bar-both" style="width: {{(row.current.pct * 100)||2}}px; " ></div>-->
              <span class="bar bar-both" ng-style="{width: (table.getBothPct(rowKey) | barSize)+'%' }" style="width: 6.4128256513026045%;"></span>
              <span class="bar bar-fg" ng-style="{width: (table.getFgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
              <span class="bar bar-bg" ng-style="{width: (table.getBgPct(rowKey) | barSize) +'%' }" style="width: 0%;"></span>
            </td>
          </tr><!-- end ngRepeat: rowKey in table.rowKeys | orderBy:elementRowSort -->
          <tr ng-show="getShowMean()" class="">
            <td class="stat">Mean</td>
            <td class="ng-binding">46.1</td>
          </tr>


          </tbody>
        </table>
      </div>


    </div>
  <!-- ngRepeat: field in getChildren(field) -->
</span>
<br/>
<input type="button" id="btnSave" value="Save PNG"/>

<div id="img-out"></div>