Alert and Confirm in asp.net

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I write function on button click event but alert didn't fire.
btnSubmit.Attributes.Add("onclick", "return check();");--code Behind
function check() --Java Script on cleint side
{
alert("The KRA can't empty");
}
And Confirm fires on 2nd click.

btnSubmit.Attributes["onClick"] = "javascript:return check();";--code Behind
function check() --Java Script on cleint side
{
var answer = confirm("Are you sure to save ?")
if (answer)
{
return true;
}
else
return false;
}
Kindly suggest,please.

Posted 24-Nov-10 19:39pm

Nilesh from Mumbai

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Toniyo Jackson 25-Nov-10 5:24am

Where r u keeping ur javascript? In ur page itself or separate javascript file?

3 solutions

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Toniyo Jackson · Answer 1 · 2010-11-25T00:10:00

Solution 3

Add the below code in page load.

C#

protected void Page_Load(object sender, EventArgs e)
{
    btnSubmit.Attributes.Add("onclick","javascript:return check()");
}

Posted 25-Nov-10 0:10am

Toniyo Jackson

Brij · Answer 2 · 2010-11-24T19:54:00

Solution 2

Try as Toni says. Also return true or false from function check based on your requirement.

Posted 24-Nov-10 19:54pm

Brij

Comments

Nilesh from Mumbai 25-Nov-10 5:05am

Could tell please,
How to check return true or false on code behind?
e.g.if (txtCkeckVal.Text == "")
{
btnSubmit.Attributes.Add("onclick", "javascript:return checkEmpty()");
}
else
btnSubmit.Attributes.Add("onclick", "javascript:return checkOK()");

Thanks Nilesh.

Vicky.tts 15-Mar-12 4:33am

dcfffffff

Brij 25-Nov-10 5:14am

I think, you got something wrong. Here your functions checkEmpty and checkOK should return true or false. If it returns true , then there will be postback after execution of the JS method and if it returns false, then there will be no postback after it

Toniyo Jackson · Answer 3 · 2010-11-24T19:44:00

Solution 1

Try this,

btnSubmit.Attributes.Add("onclick", "javascript:return check()")

Posted 24-Nov-10 19:44pm

Toniyo Jackson

Updated 24-Nov-10 19:45pm

v2

Comments

Nilesh from Mumbai 25-Nov-10 5:07am

Hi Toni ,Thanks.
But the function call on second click not on first click.

Toniyo Jackson 25-Nov-10 5:24am

Where r u keeping ur javascript? In ur page itself or separate javascript file?

Nilesh from Mumbai 25-Nov-10 6:03am

On the upper side of our page Itself.

Toniyo Jackson 25-Nov-10 6:07am

Where did u coded this "btnSubmit.Attributes.Add("onclick", "return check();");"?

Nilesh from Mumbai 25-Nov-10 6:29am

protected void btnSubmit_Click(object sender, EventArgs e)
{
double dblTotal = 0;
dblTotal = dblTotal + dblEarn;

if (dblTotal != 100)
btnSubmit.Attributes.Add("onclick", "javascript:return checkEmpty()");
else
btnSubmit.Attributes.Add("onclick", "javascript:return checkOk()");

//If CheckOK then send to another page else on same page
Response.Redirect("~/SC/frmSCard.aspx");
}

Toniyo Jackson 25-Nov-10 6:33am

thats the problem. put this "btnSubmit.Attributes.Add("onclick", "javascript:return checkEmpty()");" in page load

Nilesh from Mumbai 25-Nov-10 7:31am

Toni,the function works now.
But even the textBox is empty it goes to the next page.How will I check the response from function on code behind.
i.e.If textBox is empty, it remains on the same page.

Toniyo Jackson 25-Nov-10 7:40am

Nilesh from Mumbai 25-Nov-10 7:58am

Toni,textBox value is in Template field.
Could you tell me how I get that of textBox value,please ?
<asp:TemplateField HeaderText="Weightage">
<itemtemplate>
<asp:TextBox ID="txtWtg" runat="server" height="20px"Width="43px"> </asp:TextBox>

</asp:TemplateField>

Nilesh from Mumbai 26-Nov-10 6:33am

Toni,should I use another way like Require Field validator?

Toniyo Jackson 26-Nov-10 6:38am

of course.
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtWtg" ErrorMessage="Field Cannot be empty"></asp:RequiredFieldValidator>

Nilesh from Mumbai 30-Nov-10 4:14am

Thanks,Toni.
I done it allready.But I have to display alert message on the click button for empty box and focussed on that box..Could you tell,the specific way?