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What to do if jquery .attr fails

藏色散人Original: 2021-11-11 10:43:232677browse

The solution to jquery .attr failure: 1. Create an HTML sample file; 2. Operate the checkbox through jquery; 3. Replace attr with prop.

The operating environment of this article: windows7 system, jquery version 1.2.6, DELL G3 computer

What to do if jquery .attr fails manage?

Solution to the problem of jquery attr failure after multiple uses

Today when I was making a select-all function, I used jq’s attr method, but when I actually used it For the first time, the function of selecting all and unselecting all can be realized. However, if you click it a few times, the check effect will disappear!

Let’s take a look at the code first:

<!DOCTYPE html>  
<html>  
    <head >  
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
    <title>jquery操作checkbox方法</title>  
    <script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>  
    <script type="text/javascript" >  
         //全选  
         function selectAll() {  
             //方法一：  
             $("input[name=&#39;bjjb&#39;]").attr("checked",true);  
             //方法二：  
             /**$("input[name=&#39;bjjb&#39;]").each(function(){  
                  $(this).attr("checked",true);  
             });*/  
             //获得checkbox的值和文本  
              $("#checked").html("");  
              $("#checkedText").html("");  
              $("input[name=&#39;bjjb&#39;]:checked").each(function () {  
                    $("#checked").append($(this).val()+",");  
                    //注意文本一定要元素标签如span否则next得不到值  
                    $("#checkedText").append($(this).next().text()+",");  
              });  
         }  
         //取消全选  
         function selectNone(){  
             //方法一：  
            $("input[name=&#39;bjjb&#39;]").removeAttr("checked");  
            //方法二：  
            /*$("input[name=&#39;bjjb&#39;]").each(function(){  
                  $(this).attr("checked",false);  
             });*/  
              //获得checkbox的值和文本  
              $("#checked").html("");  
              $("#checkedText").html("");  
              $("input[name=&#39;bjjb&#39;]:checked").each(function () {  
                    $("#checked").append($(this).val()+",");  
                    //注意文本一定要元素标签如span否则next得不到值  
                    $("#checkedText").append($(this).next().text()+",");  
              });  
         }  
         //反选  
         function selectInvert() {  
            $("input[name=&#39;bjjb&#39;]").each(function(index,item){  
                 if ($(this).attr("checked")) {  
                    $(this).removeAttr("checked");  
                 } else {  
                    $(this).attr("checked", true);  
                }  
            });  
         }  
     </script>  
    </head>  
    <body>  
        <form  id="" action="" method="post">  
            <div >  
                <input type="checkbox" name="bjjb" value="1"/><span>選項一</span></br>  
                <input type="checkbox" name="bjjb" value="2"/><span>選項二</span></br>   
                <input type="checkbox" name="bjjb" value="3"/><span>選項三</span></br>    
                <input type="checkbox" name="bjjb" value="4"/><span>選項四</span></br>  
                <input type="checkbox" name="bjjb" value="5"/><span>選項五</span></br>  
            </div>  
            <div style="margin-top:10px;">  
                <input type="button"   onclick="selectAll()"   value="全选" />  
                <input type="button"   onclick="selectNone()"    value="全不选" />  
                <input type="button"   onclick="selectInvert()"   value="反选" />  
            </div>  
            <div style="margin-top:10px;">  
                选中项：<div id="checked"></div>  
                选中文本：<div id="checkedText"></div>  
            </div>  
        </form>  
  </body>  
</html>

Running effect:

First time (click to select all):

The second time (click to select all):

The third time (click again to select all):

Although I clicked it, there is no check mark. Sure enough there is a problem.

After many verifications, the forum master said:

If it is an attribute of the html itself, it is best to use the prop method

After checking the jquery 1.8 document, I also used the prop method when giving the same example:

So the above How to change it?

It’s very simple:

Just replace attr with prop. Go and try it! !

Recommended learning: "

jquery video tutorial

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