Adding listener to Jquery object in constructor
I have the following code:
<body>
<canvas id="canvas" height="300" width="300" style="border:1px solid" />
</body>
<script>
function maze(canvas){
this.ctx = canvas[0].getContext("2d");
canvas.mousedown(down);
}
function down(e){
alert(this.ctx);
}
$(document).ready(function(e){
var m = new maze($('#canvas'))
});
</script>
However in the down functio开发者_高级运维n this.ctx is undefined, any ideas why? (yes I am importing jQuery 1.6.2)
Here canvas is pointing to a jquery object and this will point to maze instance. So try this
function maze(canvas){
canvas.data("ctx", canvas[0].getContext("2d"));
canvas.mousedown(down);
}
function down(e){
alert($(this).data("ctx"));
}
$(document).ready(function(e){
var m = new maze($('#canvas'))
});
加载中,请稍侯......
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