I have question about the Dropdown Validation

Question

1.00/5 (1 vote)

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Flowing Dropdown Validation Not work( tabbing or by moving the cursor)?? what is the error.anyone plz help me??data bound this dropdown.

C#

function LoseFocus(ddlElem) {

         ddlElem.blur();
         var val = ddlElem.options[e.selectedIndex].value;
         if (val == "" || val == "Select")
             alert('Error');

     }

--------------------------------------------------------------------------------------------

XML

<asp:DropDownList ID="DropDownCountry" runat="server" AutoPostBack="true"
                      CssClass="input" Height="20px"
                      onselectedindexchanged="DropDownCountry_SelectedIndexChanged" TabIndex="18"
                      Width="99%"  onchange="LoseFocus(this);" >
                  </asp:DropDownList>

----------------------------------------------------------------------------------------------

DropDownCountry.Attributes.Add("onchange", "LoseFocus(this)");

Posted 27-Feb-13 18:43pm

Hasitha Wijesooriya

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S R JHALA 28-Feb-13 0:56am

When you want to validate, when user changes the value of DDL or on submitting the form ?

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sandeep207 · Accepted Answer · 2013-02-27T19:07:00

First importtant thing to notice is your registering event onchage twice i
Here
DropDownCountry.Attributes.Add("onchange", "LoseFocus(this)");
and
onchange="LoseFocus(this);" in aspx

from your code what i understand is on dropdown lost focus you want validate dropdown please do it below for same
onblur="LoseFocus(this);" make onblur instead of onchage. and below is update javascript method

function LoseFocus(ddlElem) {

ddlElem.blur();
var val = ddlElem.options[ddlElem.selectedIndex].value;
if (val == "" || val == "Select")
alert('Error');

}

Please let me know if you need more help