javascript for take difference of value

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i have three textbox.one for totalfees.second for payfees.third for remainingfees.

totalfees is filled already when page load.payfees i have to enter.when i leave from textbox remainigfees calculated automatically.
for this i have to use javascript.i have try this..but i think i have problem in my javascript function.please help me.

function RemainingFees()
{
var v1=document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_totalfees");
var v2=document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_remainingFees");
var v=v1.value-v2.value;
document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_totalfees")=v.value;

}

Posted 25-Jan-13 9:17am

Member 9511889

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2 solutions

Solution 2

In addition to correct answer by Zoltán Zörgő:

First bug I can see immediately:

C#

document.getElementById("txt_remainingfees")=v.value;

What is v.value?! Should be:

C#

document.getElementById("txt_remainingfees").value=v;

Besides, to get values from strings, you had to use parseInt(string):
http://www.w3schools.com/jsref/jsref_parseint.asp[^].

I would also advise to use jQuery. It would be:

C#

total=parseInt($("#txt_totalfees"));
fees = parseInt($("#txt_payFees"));
result = $("#txt_remainingfees");
result.value = total.value - fees.value;

Please see:
http://en.wikipedia.org/wiki/JQuery[^],
http://jquery.com/[^].

—SA

Posted 25-Jan-13 10:42am

Sergey Alexandrovich Kryukov

Updated 25-Jan-13 10:47am

v3

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**Zoltán Zörgő** · Accepted Answer · 2013-01-25T09:20:00

Solution 1

Try:

document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_totalfees").value=v;

You have put .value on the wrong side.

Posted 25-Jan-13 9:20am

Zoltán Zörgő

Comments

Sergey Alexandrovich Kryukov 25-Jan-13 16:34pm

Correct, a 5.
—SA

Sergey Alexandrovich Kryukov 25-Jan-13 16:45pm

However, something else is missing before this line.
Before doing integer arithmetic operations, strings should be parsed with JavaScript parseInt(string).
Please see my answer. Your answer is of course credited...

And I deleted OP's re-post where I initially saw this question and answered. Tnank you for notification on this re-post.
—SA