How to differentiate between click and drag/drop event?

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梦毁少年i
梦毁少年i 2021-02-15 23:23

I have a problem with element which is both draggable and also has a click event.

$(\'.drag\').mousedown(function() {
    //...
});

$(\'.class\').click(function         


        
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5条回答
  • 2021-02-16 00:11

    In my case selected answer didn't worked. So here is my solution which worked properly(may be useful for someone):

        var dragging = 0;
        $(document).mousedown(function() {
            dragging = 0;
            $(document).mousemove(function(){
               dragging = 1;
            });
        });
    
        $('.class').click(function(e) {
            e.preventDefault();
            if (dragging == 0){
                alert('it was click');
            }
            else{
                alert('it was a drag');
            }
        });
    
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  • 2021-02-16 00:14

    Also you could probably do something with the mousemove and mousedown events together to disable the click event:

    var dragging = 0;
    
    $('.drag').mousedown(function() {
        $(document).mousemove(function(){
           dragging = 1;
        });
    });
    
    $(document).mouseup(function(){
        dragging = 0;
        $(document).unbind('mousemove');
    });
    
    $('.class').click(function() {
        if (dragging == 0){
           // default behaviour goes here
        }
        else return false;
    )};
    
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  • 2021-02-16 00:15

    I noticed that if the drag event is registered prior to click event then the problem described will not happen. Here is an example code:

    This code create the mentioned problem:

            var that = this;
            var btnId = "button_" + this.getId();
            var minView = $("<div>", {"id":btnId, style:"position:absolute; top:"
                + this.options.style.top + ";left:" + this.options.style.left + ";border:1px solid gray;padding:2px"});
            minView.html(this.getMinimizedTitle());
    
            minView.click(function expendWidget(event) {
                $("#" + btnId).remove();
                that.element.css({"left":that.options.style.left, "right":that.options.style.right});
                that.element.show();
            });
    
            minView.draggable();
            minView.on("drag", this.handleDrag.bind(this));
    
            this.element.parent().append(minView);
    

    this code does not create the problem:

            var that = this;
            var btnId = "button_" + this.getId();
            var minView = $("<div>", {"id":btnId, style:"position:absolute; top:"
                + this.options.style.top + ";left:" + this.options.style.left + ";border:1px solid gray;padding:2px"});
            minView.html(this.getMinimizedTitle());
    
            minView.draggable();
            minView.on("drag", this.handleDrag.bind(this));
    
            minView.click(function expendWidget(event) {
                $("#" + btnId).remove();
                that.element.css({"left":that.options.style.left, "right":that.options.style.right});
                that.element.show();
            });
            this.element.parent().append(minView);
    
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  • 2021-02-16 00:21

    It's ok, but you should alway remember, that user can move mouse slightly during the click and don't notice that. So he'd think hi clicked and you – that he dragged

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  • 2021-02-16 00:28

    You should be able to do that by stopping the propagation on the mousedown event.

    $('.drag').mousedown(function(event){
      event.stopPropagation();
    });  
    

    You may have to make sure that this event is attached before the click event though.

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