How to call Java Script function in ASP.NET TextBox OnTextChanged Event

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Hai,
I have two text boxes named txtDOB (Date Of Birth), and txtDOJ (Date of Join)
i have to compare both text boxes DOJ is not greater than DOB..
For this i wrote a java script function, my problem is how to cal that
java script function in txtDoJ's "OnTextChanged Event ",

If u know help me..

Thanks and Regards,
Honey.

Posted 3-Mar-11 1:08am

honey4bee

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3 solutions

Solution 1

Call your javascript on onchange event.

<asp:TextBox ID="txtDOJ" runat="server" onchange="javascript:alert('test');"></asp:TextBox>

Posted 3-Mar-11 2:16am

m@dhu

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Sandeep Mewara 3-Mar-11 9:39am

OP would get confused. ASP Textbox does not expose the client side onchange via designer! :)

Solution 3

If you want to compare two text boxes having date time values, I would recommend you should use a compare validator with Type="Date"

Posted 3-Mar-11 6:54am

Sreejith Gopinathan

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honey4bee 4-Mar-11 4:20am

K accepted.

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Sandeep Mewara · Accepted Answer · 2011-03-03T03:42:00

Solution 2

For this i wrote a java script function, my problem is how to cal that
java script function in txtDoJ's "OnTextChanged Event ",

You need to add an attribute of client side onchange from server side.
Try:

C#

txtDOJ.Attributes.Add("onchange","javascript:MyJSMethodWhereINeedToChange()");

Doing this would introduce the client side event of text change.

OR

Alternatively, you can use the HTML input control. In that, directly onchange in html designer would trigger the JS event. In order to trigger server textchange event, you would need to use onserverchange event.

Posted 3-Mar-11 3:42am

Sandeep Mewara

Comments

Sergey Alexandrovich Kryukov 3-Mar-11 12:45pm

That's good, but in more general case you also need to pass "event" to the Javascript function.
My 4 this time.
--SA

Sandeep Mewara 3-Mar-11 13:36pm

Event as in? I didn't get that. In general, above works for almost all the cases. At times, one might need to pass on the control's id at max. What else?

Sergey Alexandrovich Kryukov 3-Mar-11 21:29pm

Of course you can add event as the argument. Consider this:

<html>
<head>
<script type="text/javascript"></script>
</head>
<body">

<input type="text" önchange="event.value=1213; eventHandler(event)" />

</body>
</html>

In this code, even will be fired when you type something and hit enter; the handler will alert type "change" and than "1213". This is very useful. For some other events like "OnKeyPress" this is critically important, without event information you cannot filter out keystroke to make input control typing just digits, or something like that.

--SA

Sandeep Mewara 3-Mar-11 22:28pm

Yep, we can. My point was, why to if we can do without it in most of the case. Out here in OP cases for sure.

:)

Sergey Alexandrovich Kryukov 3-Mar-11 22:37pm

Well, yes, it may or may not be needed, depending on event type as well. Still, pretty useful, because you can use the same handler code for different controls (and even different event types), still having some data to tell one case from another. That was my point.
--SA

Sandeep Mewara 3-Mar-11 22:46pm

Ok. I agree on that. I was just a little confused on why would we need it here. :)

(And while suggesting a beginner, if I add on events too, I am sure I will be pinged back, with what & why) :P

Sergey Alexandrovich Kryukov 3-Mar-11 23:08pm

Every beginner deserve a chance to feel like a master :-)
--SA

Sandeep Mewara 4-Mar-11 0:09am

I have yet to start signature lines in my signature. But, whenever I do, this would be the first. :)

(Requested, Copied, Will be published - obviously with your name)

Sergey Alexandrovich Kryukov 4-Mar-11 1:06am

:-)

xibit89 7-Mar-14 6:40am

Thanks Sandeep Mewara it Worked perfect for me..

Sandeep Mewara 7-Mar-14 7:31am

Great to know!