JS select the relevant drop-down box method

1. The dynamic creation of select

 function createSelect(){

        var mySelect = document.createElement(select); 
        mySelect.id = mySelect;  
        document.body.appendChild(mySelect);
    }

2. Add Options option

function addOption(){

         According to ID lookup object,  
         var obj=document.getElementById('mySelect');

          Add an option  
         obj.add(new    Option( Text  , Value  ));   
   }

3. Delete all option option

function removeAll(){
         var obj=document.getElementById('mySelect');
  
         obj.options.length=0;  

   }

4. Option to delete an option

  function removeOne(){
         var obj=document.getElementById('mySelect');

         index, The number you want to delete option, remove the currently selected option here the ordinal number  

         var index=obj.selectedIndex;
         obj.options.remove(index);  
   }

5. To obtain the option value option

var obj=document.getElementById('mySelect');

var index=obj.selectedIndex;  Ordinal number, take the ordinal number of the currently selected option  

var val = obj.options[index].value;

6. To obtain a copy option option

var obj=document.getElementById('mySelect');

var index=obj.selectedIndex;  Ordinal number, take the ordinal number of the currently selected option  

var val = obj.options[index].text;

7. Edit Options option

var obj=document.getElementById('mySelect');

var index=obj.selectedIndex;  Ordinal number, take the ordinal number of the currently selected option  

var val = obj.options[index]=new Option( The new text  , The new value  );

8. Delete select

    function removeSelect(){
          var mySelect = document.getElementById(mySelect);
         mySelect.parentNode.removeChild(mySelect);
   }

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