How to get JAVASCRIPT textbox value from C#

Question

3.70/5 (3 votes)

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hi,

I have three textboxes, here when i change the value of the text box it will calculate(multiply) the value and give output in another textbox.

My problem is...

When i change value in text 2, The appropriate values are calculated and gives in text 3.But while i retrieve text 3 value from server side it remains the older value not newer value which i changed through text 2(generated from JAVASCRIPT).

My Script is...

C#

function GetTotalamt(vat, assess, dis, dischk, net)
 {
 var V = parseFloat(document.getElementById(assess).value) * (parseFloat(document.getElementById(vat).value) / 100);

 var afterV = parseFloat(document.getElementById(assess).value) + parseFloat(V);

 var D = parseFloat(document.getElementById(dis).value);

 document.getElementById(net).value = parseFloat(afterV) - parseFloat(D);

}

Posted 11-Jul-11 1:36am

J.Karthick

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4 solutions

Solution 1

Hi,

try this

document.getElementById('<%= txtFName.ClientID %>').value

where txtFname is asp.net server control

Posted 11-Jul-11 1:46am

Syed Salman Raza Zaidi

Comments

J.Karthick 11-Jul-11 8:15am

:( No luck....

J.Karthick 11-Jul-11 8:48am

Its added the values to my text....but i cant retrieve those newly added text

Syed Salman Raza Zaidi 11-Jul-11 9:17am

for newly added text you can use a variable and store value in it

Solution 2

You only changed the value in the textbox on the client side (javascript). The server won't get an update on this automatically because it would otherwise always happen, even if you don't want/need it. You need to submit the form with that textbox to post those values to the server. The server code (c#) can then store those values or do whatever with it you like.

You might want to consider storing only the value of text 2 server side and recalculate the value of text 3. It's not often a good idea to store calculated values because as it implies, they can be recalculated easily most of the time.

Good luck!

Posted 11-Jul-11 1:54am

E.F. Nijboer

Comments

J.Karthick 11-Jul-11 8:03am

Ya...Thanks for your suggestion

Ankur^\m/ 11-Jul-11 8:19am

answer worth a 5!

J.Karthick 11-Jul-11 8:46am

How can i submit it runtime?

E.F. Nijboer 13-Jul-11 15:19pm

Ah, I see you already found that a form submit is needed. That was exactly what I meant :-)

Solution 4

string value = Request.Form[[TextBoxID].UniqueID]

The above works for me.

Posted 29-May-14 11:16am

Dianyang Wu

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J.Karthick · Accepted Answer · 2011-07-11T03:11:00

I found a solution....

I should POSTBACK my page to save the Client side values....
If i POSTBACK once it will automatically updated to my Server side controls...

or

You can use <asp:HiddenField> to retrieve values...

refer

http://stackoverflow.com/questions/4396804/access-server-side-variable-on-client-side-and-vice-versa-asp-net-and-javascript[^]

Thanks for your support....