Question

I am using ASP.NET with C#

I have a HTMLSelect element and i am attemping to call a javascript function when the index of the select is changed.

riskFrequencyDropDown is dynamically created in the C# code behind tried:

 riskFrequencyDropDown.Attributes.Add("onchange", "updateRiskFrequencyOfPointOnMap(" + riskFrequencyDropDown.ID.Substring(8) + "," + riskFrequencyDropDown.SelectedValue +");");

but it does not call the javascript function on my page. When i remove the parameters it works fine, but i need to pass these parameters to ensure proper functionality.

Any insight to this problem would be much appreciated

Answer 1

Are your parameters numeric or alphanumeric? If they contain letters, you’ll need to quote them in the javascript. Note the addition of the single quotes below.

riskFrequencyDropDown.Attributes.Add("onchange",
             "updateRiskFrequencyOfPointOnMap('"
                  + riskFrequencyDropDown.ID.Substring(8)
                  + "','"
                  + riskFrequencyDropDown.SelectedValue +"');");