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javascript - 'onmousedrag' event js

I have some code that works each time onmouseclick and continuously onmousemove when I set them accordingly. I am looking for a way to combine the two (i.e. like a click and drag) which I thought would be a simple task but cannot find any simple explanation. The closest I get is drag-and-drop tutorials.

Do I have to call the onmousemove event while the onmouseclick event is triggered? Or is there something really simple I am completely overlooking?

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You might want to just use a flag like this: http://jsfiddle.net/n3MeH/.

var isMouseDown = false;
document.onmousedown = function() { isMouseDown = true  };
document.onmouseup   = function() { isMouseDown = false };
document.onmousemove = function() { if(isMouseDown) { /* do drag things */ } };

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