jquery Operations Select Dropdown box multiple methods (check, value, assignment, etc.)

Query gets the text and value of the Select selection: Syntax Explanation: 1.   $ ("#select_id"). Change (function () {//code ...}); Adds an event for select, triggering 2 when one of the items is selected.  var checktext=$ ("#select_id"). Find ("option:selected"). Text (); Gets the Select selected text 3.  var checkvalue=$ ("#select_id"). Val (); Gets the value 4 selected by the Select.  var checkindex=$ ("#select_id"). Get (0). SelectedIndex; Gets the index value of the select selection of 5.  var maxindex=$ ("#select_id option:last"). attr ("index"); Gets the maximum index value of the Select jquery setting Select the text and value: syntax Explanation: 1.  $ ("#select_id"). Get (0). selectedindex=1; Set the Select index value to 1 to select 2.   $ ("#select_id"). Val (4); Set the value of select to 4 to select 3.   $ ("#select_id option[text= ' jQuery ']"). attr ("selected", true); Set the text value of the Select to jquery for the item selected jquery Add/Remove option entry for select: Syntax explanation: 1.  $ ("#select_id"). Append ("<option value= ' value ' >Text</option>"); Append an option to the Select (drop-down) 2.  $ ("#select_id"). Prepend ("<option value= ' 0 ' > Please select </option>"); Insert an option (first position) 3 for select.  $ ("#select_id option:last"). Remove (); Delete the index value in select maximum option (last) 4. $ ("#select_id option[index=' 0 ']. Remove (); Delete option (first) 5 with index value 0 in select.  $ ("#select_id option[value= ' 3 ']"). Remove (); Delete option 5 for value= ' 3 ' in select.  $ ("#select_id option[text= ' 4 ']"). Remove (); Delete option text= ' 4 ' in select Http://www.k686.com jquery radio value, checkbox value, select Value, Radio selected, CheckBox selected, select selected,  And its correlation 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;   The second element of the radio Radio Group is the currently selected value $ (' input[@name =items] '). Get (1). checked = true; Gets the value: text box, text area: $ ("#txt"). attr ("value"), Multi-marquee checkbox:$ ("#checkbox_id"). attr ("value"), Radio Group Radio: $ ("input[@type =radi  o][@checked]). Val ();   Drop-down box select: $ (' #sel '). Val (); Control form elements: text box, text area: $ ("#txt"). attr ("Value", "");//Empty contents $ ("#txt"). attr ("value", ' 11 ');//Fill Content Multi Marquee checkbox: $ ("#chk1"). attr ("Checked", "");//Do not tick $ ("#chk2"). attr ("Checked", true);//Tick if ($ ("#chk1"). attr (' checked ') ==undefined)// Determine if you have ticked the radio Group radio: $ ("input[@type =radio]). attr ("Checked", ' 2 ');//Set value=2 item as the current Check drop-down box select: $ ("#sel"). attr ("value", '-sel3 ');// Set VALUE=-SEL3 items to the currently selected $ ("<option value= ' 1 ' >1111</option><option value= ' 2 ' >2222</option>" ). AppendTo ("#sel")//Add the option $ ("#sel") to the drop-down box. empty ();//Empty drop-down box----------------------------------------------------- -----------------------------------------------//Traverse option and Add, 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{$ ("<option value= ' 111 ' >ups ground</option>"). AppendTo ($ ("select[@name =ishiptype]"));}} Gets the selected value of the drop-down list $ (#testSelect option:selected '). Text (); or $ ("#testSelect"). Find (' option:selected '). Text (); or $ ("#testSelect"). Val (); A bad memory can be collected under: 1, drop-down box: var cc1 = $ (". FORMC select[@ Name= ' Country '] option[@selected]). Text (); Get the text of the selected item in the drop-down menu (note that there are spaces in the middle) var CC2 = $ ('. FORMC select[@name = "Country"]. Val (); Get the value of the selected item in the drop-down menu var cc3 = $ ('. FORMC select[@name = "Country"]). attr ("id"); Gets the ID property value of the selected item in the drop-down menu ("#select"). empty ();//Empty the drop-down box//$ ("#select"). HTML ("); $ ("<option value= ' 1 ' >1111</option>"). AppendTo ("#select")//Add the drop-down box option to explain it a little bit: 1.select[@name = ' Country '] option[@selected] represents an option element with the Name property, and the value of the property has a selected attribute inside the Select element of ' country '; it can be seen that a @ begins with a property. 2, Radio Box: $ ("input[@type =radio][@checked]"). Val (); Get the value of the selected item in the Radio box (note that there is no space in the middle) $ ("input[@type =radio][@value =2]"). attr ("Checked", ' checked '); Sets the value=2 of the radio box to the selected state. (Note that there is no space in the middle) 3, check box: $ ("input[@type =checkbox][@checked]"). Val (); The value of the first item that gets the check box selected is $ ("input[@type =checkbox][@checked]"). each (function () {////Because the check box is generally selected for more than one, you can loop out the alert ($ (this). val ()); }); $ ("#chk1"). attr ("checked");//Do not tick $ ("#chk2"). attr ("Checked", true);//Tick if ($ ("#chk1"). attr (' checked ') = = Undefined) {}//Determine if it has been ticked of course the jquery selector is powerful. There are many other ways. <script src= "Jquery-1.2.1.js "type=" Text/javascript "></script> <script language=" javascript "type=" Text/javascript "> $ ( Document). Ready (function () {$ (' #selectTest '). Change (function () {//alert ("Hello");//alert ($ ("#selectTest"). attr (" Name ")); $ ("a"). attr ("href", "xx.html"); Window.location.href= "xx.html"; Alert ($ ("#selectTest"). Val ()); Alert ($ ("#selectTest option[@selected]"). text ()); $ ("#selectTest"). attr ("Value", "2"); }); }); </script> <a href= "#" >aaass</a> <!--drop-down box--<select id= "selecttest" name= "Selecttest" > & Lt;option value= "1" >11</option> <option value= "2" >22</option> <option value= "3" >33</ Option> <option value= "4" >44</option> <option value= "5" >55</option> <option value= "6" >66</option> </select> jquery Radio value, checkbox value, select Value, Radio selected, CheckBox selected, select selected, And its correlation 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; The second element of the radio Radio Group is the currently selected value $ (' input[@name =items] '). Get (1). checked = true; Gets the value: text box, text area: $ ("#txt"). attr ("value"), Multi-marquee 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", "");//Empty contents $ ("#txt"). attr ("value", ' 11 ');//Fill Content Multi Marquee checkbox: $ ("#chk1"). attr ("Checked", "");//Do not tick $ ("#chk2"). attr ("Checked", true);//Tick if ($ ("#chk1"). attr (' checked ') ==undefined)// Determine if you have ticked the radio Group radio: $ ("input[@type =radio]"). attr ("Checked", ' 2 ');//Set value=2 item as the currently selected drop-down box select: $ ("#sel"). attr (" Value ", '-sel3 ');//Set VALUE=-SEL3 item as currently selected $ (" <optionvalue= ' 1 ' & gt;1111</option><optionvalue= ' 2 ' >2222</option& gt; "). AppendTo ("#sel")//Add the option $ ("#sel") of the drop-down box. empty ();//empties the drop-down box to get a set of radio the value of the selected item 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; The second element of the radio Radio Group is the currently selected value $ (' input[@name =items] '). Get (1). checked = true; Gets the value: text box, text area: $ ("#txt"). attr ("value"), Multi-marquee 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", "");//Empty contents $ ("#txt"). attr ("value", ' 11 ');//Fill Content Multi Marquee checkbox: $ ("#chk1"). attr ("Checked", "");//Do not tick $ ("#chk2"). attr ("Checked", true);//Tick if ($ ("#chk1"). attr (' checked ') ==undefined)// Determine if you have ticked the radio Group radio: $ ("input[@type =radio]"). attr ("Checked", ' 2 ');//Set value=2 item as the currently selected drop-down box select: $ ("#sel"). attr (" Value ", '-sel3 ');//Set VALUE=-SEL3 item as currently selected $ (" <option value= ' 1 ' >1111</option><option value= ' 2 ' >    2222</option> "). AppendTo (" #sel ")//Add the option $ (" #sel ") to the drop-down box. empty ();//Empty drop-down box

jquery Operations Select Dropdown box multiple methods (check, value, assignment, etc.)