javascript 在画布 html5 页面上模拟鼠标上下移动
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simulate a mouse down and up on a canvas html5 page
提问by Philo
How can I simulate a mouse down and then followed by a mouse up event on a canvas hmtl5 section of an aspx page?
如何在 aspx 页面的画布 hmtl5 部分模拟鼠标按下，然后是鼠标按下事件？
I searched on the web and found this... but i cannot correlate this to my canvas html5 element, Can anyone help ?
我在网上搜索并找到了这个……但我无法将它与我的画布 html5 元素相关联，有人可以帮忙吗？
dispatchMouseEvent(element, 'mouseover', true, true);
dispatchMouseEvent(element, 'mousedown', true, true);
dispatchMouseEvent(element, 'click', true, true);
dispatchMouseEvent(element, 'mouseup', true, true);
回答by user2701675
"Simulating" events is very easy, in fact, you can simply trigger them. Using jQuery, this becomes child's play (see this jsfiddlefor working example):
“模拟”事件非常容易，实际上，您可以简单地触发它们。使用 jQuery，这就变成了孩子的游戏（参见这个 jsfiddle的工作示例）：
$('#canvas_element').on("mousedown mouseup", function(e) {
console.log(e.type + " event fired at coords: " + e.pageX + ", " + e.pageY);
});
x_coord = 1;
y_coord = 1;
var e = jQuery.Event( "mousedown", { pageX: x_coord, pageY: y_coord } );
$('#canvas_element').trigger(e);
// execute more code
x_coord = 255;
y_coord = 255;
var e = jQuery.Event( "mouseup", { pageX: x_coord, pageY: y_coord } );
$('#canvas_element').trigger(e);
See this old SO questionfor a pure javascript solution.
有关纯 javascript 解决方案，请参阅这个旧的 SO 问题。
