A summary of some basic methods of jquery operation Select

T1 >>> Create a new Select
var $newSelect = $ ("<select id=\" sel\ "name=\" s_name\ "></select>"); Note Escape \

T2 >>> Create a new option
var $option = $ ("<option value=\" value\ ">1</option>");

T3 >>> add option to array options
Way One:
$newSelect. Append ($option);
Way two:
$newSelect. Append ("<option value=\" value\ ">1</option>"); Add to option sequence last
Way three:
$newSelect. Prepend ("<option value=\" value\ ">1</option>"); Add to Option sequence top
Option index value overflow is not supported add new option

T4 >>> Adding a Select to a page
$newSelect. AppendTo (' body ');
$newSelect. AppendTo ($ (' body '));
$ (' body '). Append ($newSelect);

The Append () and AppendTo () methods perform the same tasks.
The difference is that the location of content and selectors, and append () can use functions to attach content.
$ (selector). Append (function (index,html))

T5 >>> Clear option options for select
$ ("#sel option[value= ' 1 ']"). Remove (); Remove option with value 1
$ ("#sel option[index=2]"). Remove (); To remove option with index 2
$ ("#sel option[text= ' _txt ')". Remove (); Remove the option with the text value of _txt
$ ("#sel option:last"). Remove (); Remove the last option
$ ("#sel option:selected"). Remove (); Remove selected selected option

T6 >>> Modify option option for select

The text value of the selected item
Newselect.find (' option:selected '). Text ();

Value of the selected item
$newSelect. Val ()
$newSelect. Find (' option:selected '). Val ();
$ (' select[name= ' S_name "]). Find (' option:selected '). Val ();

The text val value of any item
$newSelect. Find (' option '). EQ (index). text ();
$newSelect. Find (' option '). EQ (Index). Val ();

$newSelect. Children (' option '). EQ (index). text ();
$newSelect. Children (' option '). EQ (Index). Val ();

$ ("#sel option[value= ' 1 ']"). Text ();
$ ("#sel option[value= ' 1 ']"). Val ();

$ ("#sel option[index=2]"). Text ();
$ ("#sel option[index=2]"). Val ();

$ ("#sel option[text= ' _txt ')". text ();
$ ("#sel option[text= ' _txt ')". Val ();

Outputs all text values for the option sequence.
$newSelect. Text ()

Output Select the index value that is selected.
$ ("#sel"). Get (0). SelectedIndex; Get (0) converts the jquery object into the Dom form.
$ ("#sel option:selected"). Index ()

Gets the length value of option
$ ("#sel option"). length
$newSelect. Find (' option '). length
$newSelect. Children (' option '). length

>>> the entire process
<script>
var $newSelect = $ ("<select id=\" sel\ "></select>");
var $option = $ ("<option value=\" 1\ ">1</option>");
$ (' body '). Append ($newSelect);
$newSelect. Append ($option);
</script>

Note: Some of the ways to convert jquery and DOM elements are sometimes used:
$ (this) [0]
$ (this). Get (0)
$ (this). ToArray () [0];
The above 3 types of notation are equivalent

A summary of some basic methods of jquery operation Select