JavaScript setting values

In the situation of a combination box populated by JavaScript, when a dropdown list is selected, retrieving the value can be problematical. Here's a solution.

This tip was submitted to the VS.NET Info Center by member Clive Chinery. Please let other users know how useful it is by rating it below. Do you have a tip or code of your own you'd like to share? Submit it here.


In the situation of a combination box populated by JavaScript, when a dropdown list is selected, retrieving the value can be problematical. The solution is to trap the click within JavaScript and output the value to a textbox.

However, this textbox cannot be hidden by setting visible to false, as it will then not be rendered. The solution is make the textbox invisible by setting the border to none, the backcolor to transparent and the forecolor to the same as the form background.

Code:

function DoActivity3() {
var theform = document.Form1;
var iSeek = 0;
var cboActivity3 = theform.cboActivity3;
  i = cboActivity3.selectedIndex;
  iSeek = cboActivity3.options[i].value;
  theform.txtActivityId3.value = iSeek;
}

This was first published in April 2003

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