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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 - 9:17
Member 9511889660
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2 solutions

Try:
document.getElementById("ctl00_ContentPlaceHolder1_TabContainer1_TabPanel1_txt_totalfees").value=v;
You have put .value on the wrong side.
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Posted 25 Jan '13 - 9:20
Zoltán Zörgő39.6K
Comments
Sergey Alexandrovich Kryukov - 25 Jan '13 - 16:34
Correct, a 5. —SA
Sergey Alexandrovich Kryukov - 25 Jan '13 - 16:45
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
In addition to correct answer by Zoltán Zörgő:
 
First bug I can see immediately:
document.getElementById("txt_remainingfees")=v.value;
 
What is v.value?! Should be:
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:
 
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
  Permalink  
Posted 25 Jan '13 - 10:42
Sergey Alexandrovich Kryukov585K
Edited 25 Jan '13 - 10:47
v3
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