JavaScript common functions (1): jquery operation Select Basic operation

$ (this). Children (' option:selected '). Val ();//This is the value of selected.$ ("#charCity"). empty ();//Content Empty:

jquery Gets the text and value selected by select:

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

jquery Add/Remove option for select:

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

Content empty:

Copy CodeThe code is as follows:
$ ("#charCity"). empty ();

JavaScript common function (1): jquery operation Select Basic Operation