JS Operation Select and option

Source: Internet
Author: User

  This article is mainly on the JS operation Select and option examples are introduced, the need for friends can come to the reference, I hope to help you.

1. Dynamically create select   code as follows:      function Createselect () {  var myselect = document.createelement_x ("se Lect ");           myselect.id = "Myselect";            Document.body.append Child (Myselect);      }     2. Add options option code is as follows:      function addoption () {      &NB Sp    //Search object based on ID,            var obj=document.getelementbyidx_x (' Myselect ');              //add an option obj.add (new option ("Text", "value"));    //This can only be effective in IE          obj.options.add (New Option ("text", "value"); This compatible IE with Firefox      }     3. Delete all options option code as follows:      function RemoveAll () {           var obj=document.getelementbyidx_x (' Myselect '); obj.options.length=0;             4. Delete an option The following code is as follows: FunctiOn Removeone () {           var obj=document.getelementbyidx_x (' Myselect ');     &N Bsp        //index, to remove the ordinal number of the option, here take the current selected option of the serial number   VAR Index=obj.selectedindex; Obj.options.remove (index);     &NBSP     5. Get options option value   var obj=document.getelementbyidx_x (' Myselect '); var Index=obj.selectedindex; Ordinal number, taking the ordinal number of the currently selected option var val = obj.options[index].value;   6. Get options Option text   var obj=document.getelementbyidx_x (' Myselect '); var Index=obj.selectedindex; Ordinal number, taking the ordinal number of the currently selected option var val = obj.options[index].text;   7. Modify Options option   var obj=document.getelementbyidx_x (' Myselect '); var Index=obj.selectedindex; Ordinal number, taking the ordinal number of the currently selected option var val = obj.options[index]=new option ("New text", "New value");   8. Delete Select   Code as follows: function Removeselect () {var myselect = document.getelementbyidx_x ("Myselect"); MySelect.parentNode.removeChild (Myselect);     &NBSP}   complete code for the entire instance is as follows: The code is as follows: <! DOCTYPE HTML Public "-//w3c//DTD HTML 4.01//zh-cn "Http://www.w3.org/TR/html4/strict.dtd" > <html> <head>    <meta http-equiv= "Content-type" content= "text/html" > <head>    <script language=javascript>     function $ (ID)     {     return document.getelementbyidx_x (ID)    } &NB Sp   function Show ()     {     var selectobj=$ ("area")      var Myoption=docume nt.createelement_x ("option")      myoption.setattribute ("value", "ten")       Myoption.appendchild (document.createTextNode ("Shanghai"))      var myoption1=document.createelement_x (" Option ")      myoption1.setattribute (" value "," M ")      myoption1.appendchild ( document.createTextNode ("Nanjing"))      selectobj.appendchild (myoption)       Selectobj.appendchild (MyOption1)    }     function choice ()     {&nbsp    var index=$ ("area"). SelectedIndex;      var val=$ ("area"). Options[index].getattribute ("value")      if (val==10)      {      var i=$ ("context")-childnodes.length-1      var remobj=$ ("context"). Childnodes[i];      remobj.removenode (true)       var sh=document.createelement_x ("select")       Sh.add (new option ("Pudong District", "a"))       Sh.add (new option ("Huangpu", "102"))       s H.add (New option ("Xuhui", ""))       Sh.add (new option ("Putuo", ")"       $ ("context"). AppendChild (SH)            if (val==100)      {      var i=$ ( "Context"). Childnodes.length-1;      var remobj=$ ("context"). Childnodes[i];      remobj.removenode (true)       var nj=document.createelement_x ("select")       NJ. Add (new option ("Xuanwu District", "201")       Nj.add (new option ("Baixia District", "")       nj.add (new option ("Xiaguan District", "203"))       Nj.add (New Option ("Qixia District", "204")       $ ("context"). AppendChild (NJ)     &NBS P;}    }     Function calc ()     {     var x=$ ("context"). Childnodes.length-1;      alert (x)    }     function remove ()     {     var i=$ (" Context "). Childnodes.length-1;      var remobj=$ ("context"). Childnodes[i];      remobj.removenode (true)    }    </script> <body> <div id= " Context ">    <select id=" area "onchange=" Choice () ">    </select> </div> < Input Type=button value= "display" onclick= "Show ()" > <input type=button value= "Compute node" onclick= "Calc ()" > <input Type=button value= "Delete" onclick= "remove ()" > </body> </html>   Improved version: Add, modify, delete option element code in select: Function Watch_ini () {//initial for (Var i=0; i<arguments.length; I + +) {var word = document.createelement_x ("option"); word.text = Arguments[i]; Watch.keywords.add (word);//watch. is form Name} function Watch_add (f) {//add var word = document.createelement_x ("option"); word.text = F.word.value; f.keywords. Add (Word); }   But the Add () method is only valid under IE, for the compatibility of FF and opera, the code is modified as follows: The   code is as follows: function Watch_ini () {//initial F or (var i=0 i<arguments.length; i++) {   var ooption=new Option (arguments[i],arguments[i);     Document.getelementbyidx_x ("Myselect") [I]=ooption; } function Watch_add (f) {//Add    var ooption=new Option (f.word.value,f.word.value);    f.keywords[ F.keywords.length]=ooption;   The complete code for the entire instance is as follows: The code is as follows: <!doctype HTML PUBLIC "-//W3C//DTD HTML 4.0 transitional//en" > <html> <head> <title>javascript Select options Text value</title> <metA name= "keywords" content= "javascript Select options text value add modify delete Set" > <meta name= "description" con tent= "JavaScript Select options text value add modify delete Set" > <script language= "javascript" > <!--functio n Watch_ini () {//initial for (Var i=0 i<arguments.length; i++) {   var ooption=new Option (arguments[i],arguments [i]);    document.getelementbyidx_x ("Myselect") [I]=ooption; } function Watch_add (f) {//Add    var ooption=new Option (f.word.value,f.word.value);    f.keywords[ F.keywords.length]=ooption; function Watch_sel (f) {//Edit F.word.value = f.keywords[f.keywords.selectedindex].text} function Watch_mod (f) {//modify F. Keywords[f.keywords.selectedindex].text = F.word.value; function Watch_del (f) {//delete f.keywords.remove (f.keywords.selectedindex);} function Watch_set (f) {//save var set = ""; for (var i=0 i<f.keywords.length; i++) {set = = F.keywords[i].text + ";";} confirm (set); }//--> </script> </head> <body> <form name= "Watch" method= "post" action= "" > <select id= "myselect" name= "keywords" Size= "onchange=" Watch_sel (this.form) "></select><br> <script language=" JavaScript "> <!- -Watch_ini ("I", "You", "You", "he", "she", "it", "er"); Initial keywords//--> </script> <input type= "text" name= "word"/><br/> The <input "button" type= "Add" O nclick= "Watch_add (this.form);"/> <input type= "button" value= "Modify" onclick= "Watch_mod (this.form);"/> < Input type= "button" value= delete "onclick=" Watch_del (this.form); "/> <input type=" button "value=" save "onclick=" watch _set (this.form); "/> </form>   Create an array method with a string: The code is as follows: <script language=" JavaScript ">    & nbsp </body> </html> <script> function spli () {datastr= "2,2,3,5,6,6";       var str= new Array ();        str=datastr.split (",");           for (i=0;i<str.length i++)         {document.write (str[i]+ "<br/>");     }    spli ();    </script>     Debugging a section of JS today, running well on IE, debugging on the Firefox error, check the data found in the   Obj.add ("text", "value");    //This can only be effective in IE          obj.options.add (New Option ("text", "value"); This compatible IE and  
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