How to determine whether checkbox is selected in jquery

Jquery method to determine whether the checkbox is selected: 1. Use the [.attr('checked)] method; 2. Use the [.prop('checked')] method; 3. Use [.is(': checked')] method.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version. This method is suitable for all brands of computers.

How jquery determines whether the checkbox is selected:

Three ways jquery determines whether it is checked:

• .attr('checked): //Look at version 1.6, return: "checked" or "undefined"; 1.5-return: true or false

• ##.prop('checked'): //16 :true/false

• .is(':checked'): //All Version: true/false//Don’t forget the colon

Several ways to write jquery assignment checked:

All jquery versions can be like this Assignment:

// $("#cb1").attr("checked","checked");
// $("#cb1").attr("checked",true);

jquery1.6: 4 types of assignment of prop:

　　　　// $("#cb1″).prop("checked",true);//很简单就不说了哦
　　　　// $("#cb1″).prop({checked:true}); //map键值对
　　　　// $("#cb1″).prop("checked",function(){
　　　　　　return true;//函数返回true或false
　　　　});

Remember there is this one:

$("#cb1″).prop("checked","checked");

Related learning recommendations:

javascript video tutorial

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