jQuery operation input type=radio implementation code

as follows:

<input type="radio" name="city" value="BeiJing">北京 
<input type="radio" name="city" value="TianJin">天津 
<input type="radio" name="city" value="NanJing">南京 
<input type="radio" name="city" value="YangZhou">扬州 
<input type="radio" name="city" value="SuZhou">苏州

1. Get the value of the selected radio:

$("input[name='city']:checked").val();

Use the element selector and then use the attribute filter name= 'city', and finally use:checked to select the selected elements.

2. Set the selected state for the radio with the specified value:

$("input[name='city'][value='YangZhou']").attr("checked",true);

Set the selected state for the radio with name="city" and value="YangZhou".

3. Cancel the selection status of the radio with name="city":

$('input[name="city"]:checked').attr("checked",false);

4. Get the number of radios with name="city":

$("input[name='city']").length;

5. Get the radio with name="city" and the index is even:

$("input[name='city']:even");

The index starts from 0.

6. Get the radio with name="city" and the index is odd:

$("input[name='city']:odd");

The index starts from 0.

7. Iterate radio:

$("input[name='city']").each(function(i,obj){ 
//i,迭代的下标，从0开始 
//obj,当前的对象(HTMLInputElement),可以使用obj.value格式获取属性值 
//$(this);当前jQuery对象,可以使用$(this).val()获取属性值 
});

Iterate the radio with name="city".

8. Disable radio:

$("input[name='city']").attr("disabled",true);

Disable the radio with name="city".

9. Enable radio:

$("input[name='city']").attr("disabled",false);

Enable the radio with name="city".

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