jquery operation Select (value, set selected)

Select and option issues are always present in the work, and the content is mostly from the network material

First, the base value problem

For example <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.

Second, many times use the cascade of select , 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 () {

Clear the second one first.

$ (". Selector2"). empty ();

In real-world applications, the option here is typically generated by looping multiple

var option = $ ("<option>"). Val (1). Text ("Pxx");

$ (". Selector2"). Append (option);

});

Iii. jQuery gets the text and value selected by select:

Syntax Explanation:
1. $ ("#select_id"). Change (function () {//code ...}); Add an event for Select, which is triggered when one of the items is selected
2. Var checktext=$ ("#select_id"). Find ("option:selected"). Text (); Gets the text selected by the Select
3. Var checkvalue=$ ("#select_id"). Val (); Gets the value selected by select
4. Var checkindex=$ ("#select_id"). Get (0). SelectedIndex; Gets the index value of the Select selection
5. Var maxindex=$ ("#select_id option:last"). attr ("index"); Gets the maximum index value of the Select

Iv. jQuery Set the text and value selected for select:

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

V. JQuery Add/Remove option for select:
Syntax Explanation:
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 option for value= ' 3 ' in select
5. $ ("#select_id option[text= ' 4 ']"). Remove (); Delete option for text= ' 4 ' in select

Vi. jquery Radio value, checkbox value, select Value, Radio selected, CheckBox selected, select selected, and its related

1 Gets the value of a set of radio selected items
var item = $ (' input[name=items][checked] '). Val ();

2 Gets the text of the Select selected item
var item = $ ("Select[name=items] option[selected]"). Text ();

3 The second element of the Select drop-down box is the currently selected value
$ (' #select_id ') [0].selectedindex = 1;

4 Radio The second element of a radio group is the currently selected value
$ (' input[name=items] '). Get (1). checked = true;

Seven, get the 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 ();

Eight, 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)