Question

I have few dynamic dropdowns that the created on change of a dropdownlist, on submit of addbutton I need to make sure that none of the dynamic dropdowns are empty. The default value of dynamic dropdowns is empty.

I tried the code below , but it does’nt seem to get the selected value of the dropdown.

 DropDownList MynewDdlList = new DropDownList();
 ddllist.ID = "ddl" + name;
 ddllist.Width = 100;
 ddllist.BorderColor = System.Drawing.Color.Red;
 ddllist.Attributes.Add("IsMandatory", "Y");

Below is my javascript function

function validateInput() {
var ddlTextBox = document.getElementsByTagName("select");
 var returnValue = 1;

for (j = 0; j < ddlTextBox.length; j++) {
    if (ddlTextBox[j].type =="text" && ddlTextBox[j].getAttribute("IsMandatory")=="Y" && ddlTextBox[j].selectedIndex == "") {
        returnValue = 0;
    }
}
if (returnValue == 0) {
    alert("Validation Failed");
    return false;
}
else {
    alert("Validation Success");
    return true;
}
}
         Please help me with the correct syntax for this  ddlTextBox[j].selectedIndex == "")    

Answer 1

.selectedIndex return a number, while .value returns a string. You want either ddlTextBox[j].selectedIndex == 0 or ddlTextBox[j].value== ""

This assumes that your first option index is the empty value.