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js multiple select all and cancel all selection implementation code_javascript skills

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Release： 2016-05-16 17:47:13

Original

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Copy code The code is as follows:

$("select").change(function(){
 var n = $(this).children().length;
 var obj;
 var i = 1;
 $(this).children().each(function(){
 if(i == n)
 {
 alert($(this).text());
 }
 i ;
 });
 });
 

Based on the above two methods, I easily got the effect I wanted, as follows:

Copy code The code is as follows:

function selectall()
{
 $("select").children().each(function(){$(this).attr("selected" ,"selected")})
}

Used children() and $(this).attr("selected","selected") respectively
A js usage

Copy code The code is as follows:

Related labels：

select all

source：php.cn

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