IE8 issue ' null' is null or not an object #156
Description
Hi,
I'm having an issue with IE8 and 9 and getting the following error
'null' is null or not an object
Jquery.knob.js
Line: 716
Char: 13
Using Jquery version 1.9.0 (error persists with 1.7.0 and 1.8.0)
code
<head>
<style>
body{
padding: 0;
margin: 0px 50px;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-weight: 300;
text-rendering: optimizelegibility;
}
p{font-size: 30px; line-height: 30px}
div.demo{text-align: center; width: 280px; float: left}
div.demo > p{font-size: 20px}
</style>
</head>
<body>
<div class="demo">
<p>× Angle offset and arc</p>
<input class="knob loader" data-readonly="true" data-linecap="round" data-angleOffset=-125 data-angleArc=250 data-fgColor="#66EE66" value="0">
</div>
<div style="clear:both"></div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="js/jquery.knob.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$(".demo").click(function(){
changeColor($(".knob"), '#fff333');
});
$(".knob").knob({
change : function (value) {
//console.log("change : " + value);
},
cancel : function () {
//console.log("cancel : ", this);
},
draw : function () {
// "tron" case
if(this.$.data('skin') == 'tron') {
var a = this.angle(this.cv) // Angle
, sa = this.startAngle // Previous start angle
, sat = this.startAngle // Start angle
, ea // Previous end angle
, eat = sat + a // End angle
, r = 1;
this.g.lineWidth = this.lineWidth;
this.o.cursor
&& (sat = eat - 0.3)
&& (eat = eat + 0.3);
if (this.o.displayPrevious) {
ea = this.startAngle + this.angle(this.v);
this.o.cursor
&& (sa = ea - 0.3)
&& (ea = ea + 0.3);
this.g.beginPath();
this.g.strokeStyle = this.pColor;
this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sa, ea, false);
this.g.stroke();
}
this.g.beginPath();
this.g.strokeStyle = r ? this.o.fgColor : this.fgColor ;
this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sat, eat, false);
this.g.stroke();
this.g.lineWidth = 2;
this.g.beginPath();
this.g.strokeStyle = this.o.fgColor;
this.g.arc( this.xy, this.xy, this.radius - this.lineWidth + 1 + this.lineWidth * 2 / 3, 0, 2 * Math.PI, false);
this.g.stroke();
return false;
}
}
});
function grow($object, value){
if($object.val() < value)
{
setTimeout(function(){$object.val(parseFloat($object.val())+1).trigger("change");grow($object, value);},30);
}
}
function changeColor($object, value){
$object.trigger('configure', {"fgColor":value, "inputColor": value});
}
grow($('.knob'), 75)
});
</script>
</body>
thanks in advance for any assistance.
Greg