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jquery: Why doesn't the hover event bubble up?

黄舟Original: 2017-06-26 11:20:111998browse

How to prevent jquery hover events from bubbling
The div background color changes when the mouse passes over each div, but I don’t want the parent div of the embedded div to change color. How to do this?
I heard it was a bubbling event, but I don’t understand.

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
        function div_hover(){
                $("div").hover(
                        function(){
                                $(this).addClass("hover");
                        },
                        function(){
                                $(this).removeClass("hover");
                        }
                );
        }
        $(function(){
                div_hover();
        });
</script>
<style type="text/css">
        .box1{background:green;width:400px;height:400px;}
        .box2{background:yellow;width:300px;height:300px;}
        .box3{background:#cc3333;width:200px;height:200px;}
        .hover{background:#33cc33}
</style>
<div class="box1">
        <div class="box2">
                <div class="box3"></div>
        </div>
</div>

$("div").hover(
            function(e){
                $(this).addClass("hover");
                e.stopPropagation();    //这里
            },
            function(e){
                $(this).removeClass("hover");
                e.stopPropagation();   //这里
            }
        );

Note, Event processingThe function needs to pass an eventObjecte

e.stopPropagation(); Putting it in directly has no effect Well? I forgot to show you a running version on the second floor.

The result is out, it’s very complicated.

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
   function div_hover(){
        var levels = {};
        var min = 100, max = 0;
        var change = function() {
            var q = 0;
            for (var p in levels) {
                $(levels[p]).removeClass("hover");
                q = Math.max(q, p);
            }
            $(levels[q]).addClass("hover");
        };
        var getLevel = function(element) {
            var level = 0;
            for (var parent = element; parent.parentNode; parent = parent.parentNode) level++;
            return level;
        };
        $("div").hover(
            function(){
                levels[getLevel(this)] = this;
                change();
            },
            function(){
                delete levels[getLevel(this)];
                $(this).removeClass("hover");
                change();
            }
        );
    }
    $(function(){
        div_hover();
    });

</script>
<style type="text/css">
    .box1{background:green;width:400px;height:400px;}
    .box2{background:yellow;width:300px;height:300px;}
    .box3{background:#cc3333;width:200px;height:200px;}
    .hover{background:#33cc33}
</style>
<div class="box1">
    <div class="box2">
        <div class="box3"></div>
    </div>
</div>

The hover event is not used, but the effect is the same. You can refer to

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        .box1{background:green;width:400px;height:400px;}
        .box2{background:yellow;width:300px;height:300px;}
        .box3{background:#cc3333;width:200px;height:200px;}
        .hover{background:#33cc33}
    </style>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
    $(function() {
        $("div").mouseover(function(e) {
            $(this).addClass("hover");
            e.stopPropagation();
        });
        $("div").mouseout(function(e) {
            $(this).removeClass("hover");
            e.stopPropagation();
        });
    });
</script>

</head>
<body>
    <div class="box1">
    <div class="box2">
        <div class="box3"></div>
    </div>
</div>
</body>
</html>

Haha, three The effects are all different. interesting.

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