display html depending on selected items in listbox

[dtra]

hi all

i'm after some script to display some html depending on what
is selected in a list box
the html i want to display are checkboxes so it's more stuff for a form
i'm using lotus notes, so i have to use javascript

i can get it to display a checkbox if a particular item is selected
but it won't show up in place, it loads a new page
with the check box the only thing on that new page

the code i'm using is very basic

function updateChecks()
{
string = "";
if (document._WEBRequest.dataReq.value == "blah") {
string = "<input type=\"checkbox\" name=\"check\" />";
string += "Boundary";
}
return string;
}
function writeChecks()
{
document.write(updateChecks());
}

the writeChecks() function is called onChange for the listbox

also don't have much clue as to how to make it show
more checkboxes if more than one item is selected in the listbox

thanks for any help

[Vincent Puglia]

Hi,

document.write(...) will always write to a new page once the original page has finished loading. What you want to do (if you want the checkboxes to appear on the same page) is use a div for the boxes to appear in and dHTML (document.layers, document.all, document.getElementById) to write to the div. (If interested, see the "dHTML: an Introduction" script/tutorial at my site -- GrassBlade)

Insofar as the multiple selections:

function a(selObj)
{
 for (var i =0;i < selObj.length;i++)
	 if (selObj.options[i].selected)
		 alert(selObj.options[i].value);
}
 
<select multiple onchange='a(this)'>

Vinny