JQuery gets the Text and Value selected by the Select statement (detailed summary) _ jquery-js tutorial

The Text and Value selected by the Select statement may need to obtain their values and collect user requirements. This article provides some common and practical operation skills, if you are interested, you can consolidate your knowledge. I hope this article will help you explain the Syntax:

The Code is as follows:

1. $ ("# select_id"). change (function () {// code...}); // Add an event for Select, triggered when one of the Select events is selected
2. var checkText = $ ("# select_id"). find ("option: selected"). text (); // obtain the selected Text
3. var checkValue = $ ("# select_id"). val (); // obtain the Value selected by Select
4. var checkIndex = $ ("# select_id"). get (0). selectedIndex; // obtain the index value selected by Select
5. var maxIndex = $ ("# select_id option: last"). attr ("index"); // obtain the largest index value of Select.

JQuery sets the Text and Value selected by Select:
Syntax explanation:

The Code is as follows:

1. $ ("# select_id"). get (0). selectedIndex = 1; // Select an item whose Select index value is 1
2. $ ("# select_id"). val (4); // Select an item whose Value is set to 4.
3. $ ("# select_id option [text = 'jquery ']"). attr ("selected", true); // set the Select Text value to jQuery.

JQuery adds/deletes Select Option items:
Syntax explanation:

The Code is as follows:

1. $ ("# select_id"). append ("Text"); // Append an Option to Select (drop-down)
2. $ ("# select_id"). prepend ("Select"); // Insert an Option for Select (first position)
3. $ ("# select_id option: last"). remove (); // Delete the largest Option (last) index value in Select)
4. $ ("# select_id option [index = '0']"). remove (); // Delete the Option with the index value 0 in Select (the first option)
5. $ ("# select_id option [value = '3']"). remove (); // Delete the Option with Value = '3' In the Select statement
5. $ ("# select_id option [text = '4']"). remove (); // Delete the Option of '4' Text = '4' in Select

Jquery radio, checkbox, select, radio, checkbox, select, and related
Obtains the value of a set of radio selected items.
Var item = $ ('input [name = items] [checked] '). val ();
Text of the selected select item
Var item = $ ("select [name = items] option [selected]"). text ();
The second element in the select drop-down box is the selected value.
$ ('# Select_id') [0]. selectedIndex = 1;
The second element of the radio Group is the currently selected value.
$ ('Input [name = items] '). get (1). checked = true;
Get value:
Text Box, text area: $ ("# txt"). attr ("value ");
Multiple choice box checkbox: $ ("# checkbox_id"). attr ("value ");
Radio Group radio: $ ("input [type = radio] [checked]"). val ();
Drop-down box select: $ ('# sel'). val ();
Control form elements:
Text Box, text area: $ ("# txt"). attr ("value", ''); // clear the content
$ ("# Txt"). attr ("value", '11'); // fill in the content
Multiple choice box checkbox: $ ("# 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: $ ("input [type = radio]"). attr ("checked", '2'); // set the project with value = 2 as the currently selected item
Drop-down box select: $ ("# sel"). attr ("value", '-sel3'); // set the value =-sel3 project to the currently selected item
$ (" 1111 2222"). AppendTo (" # sel ") // Add the option in the drop-down box
$ ("# Sel"). empty (); // clear the drop-down list
Bytes ----------------------------------------------------------------------------------------------------

The Code is as follows:

// Traverse option and add or remove option
Function changeShipMethod (shipping ){
Var len = $ ("select [name = ISHIPTYPE] option"). length
If (shipping. value! = "CA "){
$ ("Select [name = ISHIPTYPE] option"). each (function (){
If ($ (this). val () = 111 ){
$ (This). remove ();
}
});
} Else {
$ ("UPS Ground"). AppendTo ($ (" select [name = ISHIPTYPE] ");
}
}

// Obtain the value of the drop-down list

$ (# TestSelect option: selected'). text ();
Or $ ("# testSelect"). find ('option: selected'). text ();
Or $ ("# testSelect"). val ();
//////////////////////////////////////// //////////////////////////
You can add the following to your favorites:
1. drop-down box:

The Code is as follows:

Var C0 = $ (". formc select [name = 'country'] option [selected] "). text (); // get the text of the selected item from the drop-down menu (note that there is a space in the middle)
Var cc2 = $ ('. formc select [name = "country"]'). val (); // obtain the value of the selected item from the drop-down menu.
Var cc3 = $ ('. formc select [name = "country"]'). attr ("id"); // obtain the ID attribute value of the selected item from the drop-down menu
$ ("# Select"). empty (); // clear the drop-down box // $ ("# select" example .html ('');
$ ("1111"). AppendTo (" # select ") // Add the option in the drop-down box

A little explanation:
1. select [name = 'country'] option [selected] indicates that the name attribute exists,
And the select element with the selected attribute in the 'country' value;

2, single region:

The Code is as follows:

$ ("Input [@ type = radio] [@ checked]"). val (); // obtain the value of the selected item of a single sequence (note that there is no space in the middle)
$ ("Input [@ type = radio] [@ value = 2]"). attr ("checked", 'checked'); // set single checked value = 2 to the selected status. (Note that there is no space in the middle)

3. Check box:

The Code is as follows:

$ ("Input [@ type = checkbox] [@ checked]"). val (); // obtain the value of the first check box.
$ ("Input [@ type = checkbox] [@ checked]"). each (function () {// Since multiple check boxes are selected, You can output them cyclically.
Alert ($ (this). val ());
});

$ ("# Chk1"). attr ("checked", ''); // do not check
$ ("# Chk2"). attr ("checked", true); // check
If ($ ("# chk1"). attr ('checked') = undefined) {}// you can check whether a check has been performed.

Of course, jquery's selector is powerful. There are many other methods.

The Code is as follows: