JS dynamically add and delete option objects in a Select

This article mainly introduces JS dynamic add and delete Select option Object (sample code) You need friends can come to the reference, I hope to help you

The following: The code is as follows://dynamically Deletes all Options:function delalloptions () {document.getElementById ("USER_DM") in a select. Options.lengt    h=0; ///Delete one of the items in the Select Option:function deloneoption (index) {document.getElementById ("User_dm"). Options.remove    (index); ///Dynamically add items in select Option:function addoneoption () {//document.getelementbyid ("User_dm"). Options.add (New Opti          On (2, "mytest"));      var Selectobj=document.getelementbyid ("User_dm");      alert (selectobj.length);   Selectobj.options[selectobj.length] = new Option ("MyTest", "2"); }