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JQuery radio button and multi-selection button state judgment

Source: Internet
Author: User
Tags api manual
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HTML structure:

<!--the same group of single input tags must have the same name value to indicate the same set of radio boxes, otherwise have ' check ' function-->

<input type= "Radio" name= "Test" checked= "checked" value= "1th"/> 1th Item
<input type= "Radio" name= "Test" value= "section www.111cn.net"/> Item 2nd
<input type= "Radio" name= "Test" value= "3rd"/> 3rd Item
<input type= "button" value= "51gg3 search"/>

1, to set a single selection of input for the selected state:

① can set its properties checked to True

$ ("input[type= ' Radio ']"). EQ (1). attr (' checked ', true);

Click the expand Code, easy to read ② can also set its properties checked as ' checked ', the original selection will be automatically unchecked after setting

$ ("input[type= ' Radio ']"). EQ (1). attr (' checked ', ' checked ');

Click the expand code to easily read 2, to determine whether a radio box is selected:

❶ use Object.attr (' checked ') ==true is wrong, should use Object.attr (' checked ') = = ' checked ' for judgment

$ ("input[type= ' Radio ']"). EQ (1). attr (' checked ') = = ' checked ';

Click the expand Code to facilitate reading ❷ can also use the IS (': Checked ') method for judgment

$ ("input[type= ' Radio ']"). EQ (1). Is (': checked ');

Click the expand code to easily read 3 to get the selected radio box: using: Checked method

$ ("input[type= ' Radio ']:checked");

Multiple selection buttons


In the HTML checkbox, the selected word will have attributes checked= "checked".

If a checkbox is selected, the value alert ($ "#xxx" for the CheckBox's property "Checked") is printed "true" instead of "checked" attr ("checked").

If not selected, print out "undefined". That's weird, isn't it? Keep looking, ~www.111cn.net!

Don't try to make such a judgment: if ($ "#xxx". attr ("checked") = = "true")

Because it is wrong to do so, the jquery API manual writes that the return value of attr (name) is object.

So, it should be if ($ "#xxx". attr ("checked") ==true)

Example

The code is as follows Copy Code

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<title>Index</title>

<script src= "/scripts/jquery-1.4.1.js" type= "Text/javascript" ></script>
<script type= "Text/javascript" >
$ (function () {
$ ("#CheckAll"). Click (function () {
var flag = $ (this). attr ("checked");
$ ("[Name=subbox]:checkbox"). each (function () {
$ (this). attr ("checked", flag);
})
})
})
</script>

<body>
    <div>
         <input id= "Checkall" type= "checkbox"/>
        <input name= " Subbox "type= checkbox"/>
        <input name= "Subbox" type= "checkbox" />
        <input name= "Subbox" type= "checkbox"/>
         <input name= "Subbox" type= "checkbox"/>
    </div>
</body>

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Related Keywords:
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