Summary of various methods for jQuery to operate input values

Source: Internet
Author: User

Obtain the selected value
Obtains the value of a set of radio selected items.
Copy codeThe Code is as follows:
Var item = $ ('input [@ name = items] [@ checked] '). val ();

Obtain the text of the selected select item.
Copy codeThe Code is as follows:
Var item = $ ("select [@ name = items] option [@ selected]"). text ();

The second element in the select drop-down box is the selected value.
Copy codeThe Code is as follows:
$ ('# Select_id') [0]. selectedIndex = 1;

The second element of the radio Group is the currently selected value.
Copy codeThe Code is as follows:
$ ('Input [@ name = items] '). get (1). checked = true;

Get value:
Text Box, text area:
Copy codeThe Code is as follows:
$ ("# Txt"). attr ("value ");

$ ("# Txt"). val ();

Multiple selection box checkbox:
Copy codeThe Code is as follows:
$ ("# Checkbox_id"). attr ("value ");

Radio Group radio:
Copy codeThe Code is as follows:
$ ("Input [@ type = radio] [@ checked]"). val ();

Drop-down box select:
Copy codeThe Code is as follows:
$ ('# Sel'). val ();

Control form elements:
Text Box, text area:
Copy codeThe Code is as follows:
$ ("# Txt"). attr ("value", ''); // clear the content
$ ("# Txt"). attr ("value", '11'); // fill in the content

Multiple selection box checkbox:
Copy codeThe Code is as follows:
$ ("# Chk1"). attr ("checked", ''); // do not check
$ ("# Chk2"). attr ("checked", true); // check
If ($ ("# chk1"). attr ('checked') = undefined) // you can check whether the checked has been checked.

Radio Group radio:
Copy codeThe Code is as follows:
$ ("Input [@ type = radio]"). attr ("checked", '2'); // set the project with value = 2 to the selected one

Drop-down box select:
Copy codeThe Code is as follows:
$ ("# Sel"). attr ("value", '-sel3'); // set the value =-sel3 project to the currently selected item
$ ("<Optionvalue = '1'> 1111 </option> <optionvalue = '2'> 2222 </option> "). appendTo ("# sel") // Add the option in the drop-down box
$ ("# Sel"). empty (); // clear the drop-down list

==================================

In Jquery, $ ("# id") is used to obtain the page input element, which is equivalent to document. getElementById ("element"). However, this is a Jquery object instead of a dom element Object. value is the attribute of the dom element Object. therefore, use $ ("# id "). the value cannot be obtained using the following methods: val = $ ("# id") [0]. value; $ ("# id") [0]. value = "new value"; value: $ ("# id") [0]. value = "new value ";
Or $ ("# id"). val ("new value"); val = $ ("# id"). attr ("value ");

========================================

Jquery input text radio check select
Copy codeThe Code is as follows:
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> untitled document </title>

<Script src = "jquery-starterkit/lib/jquery-1.3.2.min.js" type = "text/javascript"> </script>

</Head>

<Body>
<Input type = "text" id = "dd" name = "dd" value = "dds"/> dd

<Input name = "rr" id = "rr" type = "radio" value = "34"/> ff
<Input name = "rr" id = "rr2" type = "radio" value = "4"/> 55

<Input name = "ff" type = "checkbox" value = "aa"/> jgdg
<Input name = "ff" type = "checkbox" value = "gd"/> jgdg

<Select name = "ss" id = "ss" size = "1">
<Option value = ""> </option>
<Option value = "8"> d </option>
<Option value = "2"> g </option>
</Select>

<Br/>
<Input type = "button" id = "button" value = "button 1"/>
<Input type = "button" id = "jj" value = "button 2"/>
<Br/>

<Div id = "ssd"> fgoohello </div>

</Body>

<Script language = "javascript" type = "text/javascript">
<! --
$ (Function (){
$ ("# Button"). click (function (){


// Obtain the value
// Alert ($ ('# dd'). val (); // type = text
// Alert ($ ('input [name = rr] [checked] '). val (); // type = radio
// Alert ($ ('input [name = ff] [checked] '). val (); // type = checkbox
// Alert ($ ("select [name = ss] option [selected]"). val (); // select is equal to alert ($ ("# ss option [selected]"). val ());

// Obtain text
// Alert ($ ("select [name = ss] option [selected]"). text (); // select


// Control
/* // Disable # Disable dd
$ ("# Dd"). attr ("disabled", "disabled ");
// Enable # dd unban
$ ("# Jj"). removeAttr ("disabled ");*/


// $ ('Input [name = rr] '). get (0). checked = true; // The first radio is selected
// Alert ($ ("input [type = radio] [value = 34]"). attr ("checked", 'checked'); // radio with value = 34 is selected

// Alert ($ ("input [type = checkbox] [value = gd]"). attr ("checked", 'checked'); // value = gd checkbox is selected
// $ ('Input [name = ff] '). get (1). checked = true; // The first check is selected

 

/* // Select option based on option text
Count = $ ("# ss"). find ("option"). length;
For (var I = 0; I <count; I ++)
{
If ($ ("# ss"). get (0). options [I]. text = 'D ')
{
$ ("# Ss"). get (0). options [I]. selected = true;

Break;
}
}*/

// $ ("<Option value = '1'> 1111 </option> <option value = '25'> 22s22 </option> "). appendTo ("# ss"); // Add option
// $ ("# Ss option [value = 8]"). remove (""); // remove <option value = '8'> d </option>

// $ ("# Ss"). attr ("value", '2'); // select option
// $ ('# Ss') [0]. selectedIndex = 1; // select option

// $ ("# Ss"). empty (); // clear all options

/* // Replace text
Var $ thirdLink = $ ("# ssd ");
Var linkText = $ thirdLink. text (). replace ('foo', 'bar ');
$ ThirdLink. text (linkText );*/

});
});
-->
</Script>
</Html>

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