Text not rendering in html5 canvas - IE7 & 8 (fabric.js)

Question

I'm using the canvas, Fabric.js library and IE canvas fix (excanvas.js) to generate some editable curved text over an image, but the text doesn't seem to render at all in IE7 & 8.

http://explorercanvas.googlecode.com/svn/trunk/excanvas.js

Is this a known issue with text altogether using canvas for IE7 & 8 or is there a js fix I could use to get this to work?

Here's some modified code using the curvedText example found here: http://jsfiddle.net/EffEPi/qpJTz/

HTML & CSS

<style type="text/css">
body{
font-family: Helvetica;
font-weight: normal;
font-size: 13px;
}
.canvas-box{
clear: both;
position: relative;
width: 740px;
height: 700px;
margin: auto;
}
.canvas-box .canvas-nav{
width: 200px;
height: 462px;
float: left;
position: relative;
background: #E9E9E9;
padding: 20px;
}
.canvas-box .canvas-wrap{
float: left;
position: relative;
}
</style>

<div class="canvas-box">
<div class="canvas-wrap">
<canvas id="c" width="500" height="500" style="border:1px solid #E9E9E9;"></canvas><br/>
</div>
<div class="canvas-nav">
<input type="text" id="text" value="Enter Your Name" maxlength="20" /><br>
Radius : <input type="range"  min="0" max="100" value="50" id="radius" /><br>
Spacing : <input type="range"  min="5" max="40" value="20" id="spacing" /><br>
<button id="save_img">Save Image</button>
</div>
</div>
<div class="show_img"></div>

JS

<script type='text/javascript' src='http://code.jquery.com/jquery-1.9.1.js'></script>
<!--[if IE]><script type="text/javascript" src="http://explorercanvas.googlecode.com/svn/trunk/excanvas.js"></script><![endif]-->
<script type='text/javascript' src="http://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.2.0/fabric.all.min.js"></script>
<script type='text/javascript' src="https://rawgithub.com/EffEPi/fabric.curvedText/master/fabric.curvedText.js"></script>
<script type='text/javascript'>//<![CDATA[ 
$(window).load(function(){
var CurvedTextWidth = 0;
canvas = new fabric.Canvas('c');
var circle = new fabric.Circle({
radius: 100, fill: 'blue', left: $("#c").width() / 2, top: $("#c").height() / 2, selectable: false
});
canvas.add(circle);
canvas.on('selection:cleared', onDeSelected);
canvas.on('object:selected', onSelected);
canvas.on('selection:created', onSelected);

var CurvedText = new fabric.CurvedText($('#text').val(),{
left: $("#c").width() / 2,
top: $("#c").height() / 2 -50,
textAlign: 'center',
fill: '#ffffff',
radius: 80,
id: 12,
fontSize: 18,
spacing: 10,
fontFamily: 'Arial',
fontWeight: 'normal'
});

canvas.add(CurvedText).renderAll(); 
canvas.setActiveObject(canvas.item(canvas.getObjects().length-1));
$('#text').keyup(function(){
var obj = canvas.getActiveObject();
if(obj){
obj.setText(this.value);
canvas.renderAll();
//update space and position
updatePos();
}
});

$('#text').focus(function(){
canvas.setActiveObject(canvas.item(canvas.getObjects().length-1));
});

//update space and position
function updatePos(){
CurvedText.top=$("#c").height() / 2 - 86 + CurvedText.height/2;
canvas.renderAll();
}

$('#radius, #spacing').change(function(){
var obj = canvas.getActiveObject();
if(obj){
obj.set($(this).attr('id'),$(this).val()); 
}
canvas.renderAll();
//update space and position
updatePos();
});

$('#radius, #spacing').change(function(){
var obj = canvas.getActiveObject();
if(obj){
obj.set($(this).attr('id'),$(this).val()); 
}
canvas.renderAll();
//update space and position
updatePos();
});

$('#convert').click(function(){
var props = {};
var obj = canvas.getActiveObject();
if(obj){
if(/curvedText/.test(obj.type)) {
default_text = obj.getText();
props = obj.toObject();
delete props['type'];
var textSample = new fabric.Text(default_text, props);
}else if(/text/.test(obj.type)) {
default_text = obj.getText();
props = obj.toObject();
delete props['type'];
props['textAlign'] = 'center';
props['radius'] = 50;
props['spacing'] = 20;
var textSample = new fabric.CurvedText(default_text, props);
}
canvas.remove(obj);
canvas.add(textSample).renderAll();
canvas.setActiveObject(canvas.item(canvas.getObjects().length-1));
}
});

function onSelected(){
var obj = canvas.getActiveObject();
$('#text').val(obj.getText());
$('#reverse').prop('checked', obj.get('reverse'));
$('#radius').val(obj.get('radius'));
$('#spacing').val(obj.get('spacing'));
$('#fill').val(obj.getFill());
}
function onDeSelected(){
$('#reverse').prop('checked', false);
$('#radius').val(50);
$('#spacing').val(20);
$('#fill').val('#0000FF');
}
});//]]>  

$("#save_img").click(function(){
canvas.deactivateAll().renderAll();
var mycanvas = document.getElementById("c"); //get your canvas
var image    = mycanvas.toDataURL("image/png");
window.open(image);
});
</script>

Answer 1

Dude对IE8使用ExCanvas http://excanvas.sourceforge.net/，这仅在IE8浏览器中受支持，而在IE 7中不支持

Answer 2

sorry mate you cant use canvas withie7 and ie8 . Canvas Api is not supported there

http://caniuse.com/canvas