How to determine whether an element is hidden in jquery

Jquery method to determine whether an element is hidden: 1. Use CSS attributes, the code is [var display =$('#id').css('display');]; 2. Use jquery's built-in selector , the code is [if($("#test").is(":hidden")].

The operating environment of this tutorial: windows7 system, jquery3 .2.1 version, DELL G3 computer.

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jquery method to determine whether an element is hidden:

1: Use CSS attributes

The code is as follows:

var display =$('#id').css('display');
if(display == 'none'){
   alert("被你发现了，我是隐藏的啦！");
}

2: Use jquery built-in selector

Assume our page There is such a label,

The code is as follows:

<div id="test">
<p>仅仅是测试所用</p>
</div>

Then, we can use the following statement to determine whether the label with the id "test" is hidden:

The code is as follows:

if($("#test").is(":hidden")){...} //前提是已经将jQuery的库导进来了

In this way, we can easily determine whether an element is hidden and set animations according to its status. For example:

The code is as follows:

if($("#test").is(":hidden")){
       $("#test").show();    //如果元素为隐藏,则将它显现
}else{
      $("#test").hide();     //如果元素为显现,则将其隐藏
}

3 : jQuery determines whether the element is displayed or hidden

The code is as follows:

var node=$('#id');

The first way of writing

The code is as follows:

if(node.is(':hidden')){　　//如果node是隐藏的则显示node元素，否则隐藏
　　node.show();　
}else{
　　node.hide();
}

The code for the second way of writing

is as follows:

if(!node.is(':visible')){　　//如果node是隐藏的则显示node元素，否则隐藏
　　node.show();　
}else{
　　node.hide();
}
if(node.is(':visible')){　　//如果node是显示的则隐藏node元素，否则显示
　　node.hide();
}else{
　　node.show();
}

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