jquery operation Select (value, set selected)

jquery operation Select (Add, delete, empty)

1. $ ("#select_id"). Change (function(){//code ...}); Add an event for Select, which is triggered when one of the items is selected2.varchecktext=$ ("#select_id"). Find ("option:selected"). Text ();//Gets the Select selected3.varcheckvalue=$ ("#select_id"). Val ();//gets the value selected by Select4.varcheckindex=$ ("#select_id"). Get (0). SelectedIndex;//gets the index value of the select selection5.varmaxindex=$ ("#select_id option:last"). attr ("index");//Gets the maximum index value of the Selectjquery Add/delete option entry for select: 1. $ ("#select_id"). Append ("<option value= ' value ' >Text</option>");//append an option to the Select ( drop-down item)2. $ ("#select_id"). Prepend ("<option value= ' 0 ' > Please select </option>");//Insert an option for select (first position)3. $ ("#select_id option:last"). Remove ();//Delete index value in select maximum option (last)4. $ ("#select_id option[index= ' 0 ']"). Remove ();//Delete option with index value 0 in select (first)5. $ ("#select_id option[value= ' 3 ']"). Remove ();//Delete the optiona of value= ' 3 ' in select5. $ ("#select_id option[text= ' 4 ']"). Remove ();//Delete the optiona of text= ' 4 ' in selectcontent Empty: $ ("#charCity"). empty ();

 jquery get select selected text and value: 

$ ("#select_id"). Change (function() {//Code ...});//Add an event for Select to trigger Var when one of the items is selected  // gets the text selected by the Select var // gets the value selected by Select var // gets the index value of the select selection var // Gets the maximum index value of the Select

such as <select class= "selector" ></select>

1. Set value to Pxx item selected

     $ (". Selector"). Val ("Pxx");

2. Set text to Pxx to select

    $ (". Selector"). Find ("option[text= ' Pxx ')"). attr ("selected", true);

Here is the use of a bracket, preceded by the attribute name in parentheses, without quotation marks. In many cases, the use of brackets can make logic very simple.

3. Gets the value of the currently selected item

    $ (". Selector"). Val ();

4. Gets the text of the currently selected item

    $ (". Selector"). Find ("option:selected"). Text ();

Using a colon here, mastering its usage and extrapolate will also make the code concise.

There are many times when a select cascade is used, that is, the value of the second select changes with the value selected in the first select. This is very simple in jquery.

Such as:

$ (". Selector1"). Change (function() {     //  Empty the second      $ (". Selector2") first. Empty ();      // in real-world applications, the option here is typically generated by looping multiple      var option = $ ("<option>"). Val (1). Text ("Pxx");      $ (". Selector2"). Append (option);});

jquery Gets the text and value selected by select:
Syntax Explanation:

$ ("#select_id"). Change (function () {//code ...});   Adds an event for select, triggering var checktext=$ ("#select_id") when one of the items is selected. Find ("option:selected"). Text ();  Gets the Textvar checkvalue=$ ("#select_id") selected by the Select. Val ();  Gets the Valuevar checkindex=$ ("#select_id") selected by the Select. Get (0). SelectedIndex;  Gets the index value of select selected Var maxindex=$ ("#select_id option:last"). attr ("index");  Gets the maximum index value of the Select

jquery sets the text and value selected for select:
Syntax Explanation:

$ ("#select_id"). Get (0). selectedindex=1;  Set the Select index value to 1 to select $ ("#select_id"). Val (4);   Set the value of the select value to 4 to select $ ("#select_id option[text= ' jQuery ']"). attr ("selected", true);   Set the text value of select to the item selected for jquery

jquery Add/Remove option for select:
Syntax Explanation:

$ ("#select_id"). Append ("<option value= ' value ' >Text</option>");  // append an option (drop-down) $ ("#select_id") for select. Prepend ("<option value= ' 0 ' > Please select </option>");  // Insert an option (first position)$ ("#select_id option:last") for Select. Remove ();  // Delete the index value in select maximum option (last)$ ("#select_id option[index= ' 0 ']"). Remove ();  // Delete option (first) $ ("#select_id option[value= ' 3 ')" with index value 0 in select. Remove ();  // Delete option $ ("#select_id option[text= ' 4") for value= ' 3 ' in select. Remove ();  // Delete option for text= ' 4 ' in select

jquery Radio value, checkbox value, select Value, Radio selected, CheckBox selected, select selected, and its related
Gets the value of a set of radio selected items
var item = $ (' input[name=items][checked] '). Val ();
Gets the text of the Select selected item
var item = $ ("Select[name=items] option[selected]"). Text ();
The second element of the Select drop-down box is the currently selected value
$ (' #select_id ') [0].selectedindex = 1;
Radio the second element of a radio group is the currently selected value
$ (' input[name=items] '). Get (1). checked = true;
Get Value:
text box, text area: $ ("#txt"). attr ("value");
Multi 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 Contents
$ ("#txt"). attr ("value", ' 11 ');//fill content
Multiple marquee checkbox: $ ("#chk1"). attr ("Checked", "");//No Tick
$ ("#chk2"). attr ("Checked", true);//tick
if ($ ("#chk1"). attr (' checked ') ==undefined)//Determine if a tick has been made
Radio Group Radio: $ ("Input[type=radio]"). attr ("Checked", ' 2 ');//Set value=2 for the currently selected item
Drop-down box select: $ ("#sel"). attr ("value", '-sel3 ');//Set the VALUE=-SEL3 item as the current selection
$ ("<option value= ' 1 ' >1111</option><option value= ' 2 ' >2222</option>"). AppendTo ("#sel")// option to add a drop-down box
$ ("#sel"). empty ();//Empty drop-down box

jquery operation Select (value, set selected)