I have question about the Dropdown Validation

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I have Dropdown-A and Dropdown-B. Dropdown-A is mandatory.

If a user comes to Dropdown-A and without entering anything if he moves to next available control ( Dropdown-B) either by tabbing or by moving the cursor,

error message should be displayed.

This is My dropdown.dataBind this dropdown

XML

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

Could anyone of you please help me by telling in which event to write the validation.i try 2,3 days i cant fix this problum..

Posted 25-Feb-13 19:01pm

Hasitha Wijesooriya

Updated 27-Feb-13 18:06pm

v3

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[no name] 26-Feb-13 4:06am

anyone of you please help me

3 solutions

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sandeep207 · Answer 1 · 2013-02-25T19:27:00

Please go thorugh below url for handling lostfoucs event in asp.net and
if LotsFoucs event check droplist.Itmes
JavaScript

function LoseFocus(ddlElem) {

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

}

ASPX

<asp:dropdownlist id="ddlLoseFocus" runat="server" autopostback="true" xmlns:asp="#unknown">

C#

protected void Page_Load(object sender, EventArgs e)

{

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

}

Sanjeev Alamuri · Answer 2 · 2013-02-25T19:29:00

You can achieve by following 2 quick notes:

1. onblur event for Dropdown-A, in this funcion "Check whether the Dropdown-A is selected or not. if not, then Display error messge".

2. onchange event for DropDown- b,in this funcion "Check whether the Dropdown-A is selected or not. if not, then Display error messge".

manognya kota · Answer 3 · 2013-02-25T23:01:00

Solution 3

Hi,

Try using a required field validator.

hope this link helps you.

http://forums.asp.net/t/1296491.aspx/1[^]

Posted 25-Feb-13 23:01pm

manognya kota

I have question about the Dropdown Validation

3 solutions

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