How to get mouseup to fire once mousemove complete

问题:

It seems that mouseup events are only fired when they are not in conjunction with a mousemove. In other words, push down on the left mouse button and let go, and mouseup is fired. But if you drag across the image and then let go, no mouseup is fired. Here is an example that shows this behavior:

If you load this, and click and let go, "UP" will alert. However, if you drag and then let go, no UP is fired.

How can I have mouseup fire when mousemove is completed, or how can I inspect the mousemove event to determine that the left mouse button is now off?

回答1:

This is a pattern I use alot, works generally very well on all things relating to mousemove. The mouseup event is binded when the user clicks mousedown, this forces it to fire when the user lets go of the mouse button, no matter how much it's moved.

$('#element').mousedown(function(e) {      // You can record the starting position with     var start_x = e.pageX;     var start_y = e.pageY;      $().mousemove(function(e) {         // And you can get the distance moved by         var offset_x = e.pageX - start_x;         var offset_y = e.pageY - start_y;          return false;     });      $().one('mouseup', function() {         alert("This will show after mousemove and mouse released.");         $().unbind();     });      // Using return false prevents browser's default,     // often unwanted mousemove actions (drag & drop)     return false; }); 

回答2:

Don't forget to namespace your events otherwise all event handlers will be unbound:

$('#element').bind('mousedown.namespace', function(e) {     $(document).one('mouseup', function() {         callback_func();         $(document).unbind('mousedown.namespace');     });  }); 

回答3:

As of JQuery 1.4 you need to substitute $('document') for $(). In fact, I'm using this to make a menu inside a JQuery UI Dialog, which seems to trap mousemove events. So I simply substitute my container div for $() (which looks something like $('#myContainerDiv')). This seems to work fine too.

回答4:

I had a similar problem and this worked for me:

$(document).on("dragend", function(e){   $(e.target).trigger("mouseup");   e.preventDefault(); }); 

回答5:

I've found that when I set my text as unselectable using the below CSS, the mouseup event is inhibited as well -- perhaps this will help someone else.

-moz-user-select: none; -khtml-user-select: none; user-select: none; 

回答6:

I was having a similar issue with KineticJS objects. Using kinetic's dragend instead of mouseup solved the problem.

回答7:

I've encountered the same problem. Even after I add e.preventDefault() in the mousedown handler, it is still not resolved.

Finally, I find that if I turn off the following codes in my mousemove handler, my mouseup handler is called normally.

     mouseDragArea.css({          top: dragAreaPos.y + 'px',          left: dragAreaPos.x + 'px',          width: Math.abs(mouseCurPos.x - mouseClickPos.x) + 'px',          height: Math.abs( mouseCurPos.y - mouseClickPos.y ) + 'px'      }); 

mouseDragArea is a programatically created element, which has a dotted border to show the rectangular area click-dragged by mouse:

    mouseDragArea = $('
'); 

Then, I've realized that this #mouse-drag-area element is ABOVE the original element that handles the mouseup event. So after adding the following css declaration to #mouse-drag-area, it is sorted:

    pointer-events:none; 

In another word, the crux is about which element you are setting your mouseup handler for.

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