How do you convert an html div to image and then save as gif or png?

Question

I have tried figuring out a multitude of coded div to image methods on stackoverflow 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.

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):

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

and his/her blueprint (source file):

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

This is what I did:

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

   <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>

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

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

    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(); } } 

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

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

7. 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):

    <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(); ?> <?php get_header(); ?> :

<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"> :

<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.

What went wrong? Thanks for any guidance you share!

Answer 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.

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)
                }
            })
        }
    })
}

Answer 2

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>