JS dynamically adds and deletes the Option object in the select statement (sample code)

Source: Internet
Author: User

As follows:
Copy codeThe Code is as follows:
// Dynamically delete all options in the select statement:
Function delAllOptions (){
Document. getElementById ("user_dm"). options. length = 0;

// Dynamically delete an option in the select statement:
Function delOneOption (index ){
Document. getElementById ("user_dm"). options. remove (index );
// Add the option in the select statement dynamically:
Function addOneOption (){
// Document. getElementById ("user_dm"). options. add (new Option (2, "mytest "));

Var selectObj = document. getElementById ("user_dm ");
Alert (selectObj. length );
SelectObj. options [selectObj. length] = new Option ("mytest", "2 ");

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