select all in list box

[ben oliver]

I have a struts 2 list box, want to create button or link for "select all items" for user to click and select all the items in the list box. How to do that ? any example ?

[Roberto Hernandez]

I guess you'll have to do this with javascript. See this example.
First, make sure you give your listbox an id attribute;

function selectAll(){       
       var selectBox = document.getElementById("myList");
       if(selectBox.length > 0){
		//Select all options from the Select Box Element
		for(var i = 0; i < selectBox.options.length; i++){
			selectBox.options[i].selected = true;
		}
      }
}

Then, you can invoke this function when the user clicks on the button

<input type="button" value="Select All" onclick="selectAll();" />