Programming Forums > Web Development and Design > JavaScript and Client-Side Browser Scripting

paulmedic555 · Nov 24th, 2006, 9:28 AM

Hi all our teacher gave us this simple script that when someone gives two numbers in two forms then it will multiply their contents and print the result in an another form after he click one button.Here is the code:

(Toggle Plain Text)

<script language="javascript">
function convert (form)
{
   if ((form.first.value == "") 
       (form.second.value ==""))  
       return;
   form.result.value=form.first.value * form.second.value;     
}  
</script>

and

(Toggle Plain Text)

<form method="post">
Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)>
<p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)>
<p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)>
<p>Result:<input type="text" name="result" value="not calculated" ><br>
</form>

I only tried in firefox and it didn't work.Any ideas?

DaWei · Nov 24th, 2006, 11:33 AM

You didn't copy it correctly. You're missing a logical operator between the two expressions in the "if". I didn't look beyond that. You could well get into conversion problems, auto conversion or not.

paulmedic555 · Nov 24th, 2006, 12:10 PM

Yes i didn't copy it correctly.I was missing a logical "or" operator between the expressions of "if".Now it works :

(Toggle Plain Text)

<script language="javascript">
function convert (form)
{
   if ((form.first.value == "") ||
       (form.second.value =="")) 
       return;
   form.result.value=form.first.value * form.second.value;     
}  
</script>

and

(Toggle Plain Text)

<form method="post" >  
Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)>
<p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)></p>
<p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)></p>
<p>Result:<input type="text" name="result" value="not calculated" ></p><br>
</form>

Sorry for the stupid post

bl00dninja · Nov 25th, 2006, 1:59 AM

it wasn't stupid...you fixed your problem.

oftentimes all you need is a fresh perspective.

good luck!

Nov 24th, 2006, 9:28 AM	#1
paulmedic555 Newbie Join Date: Jan 2005 Location: Greece Posts: 18 Rep Power: 0	simple multiply script Hi all our teacher gave us this simple script that when someone gives two numbers in two forms then it will multiply their contents and print the result in an another form after he click one button.Here is the code: (Toggle Plain Text) <script language="javascript"> function convert (form) { if ((form.first.value == "") (form.second.value =="")) return; form.result.value=form.first.value * form.second.value; } </script> <script language="javascript"> function convert (form) { if ((form.first.value == "") (form.second.value =="")) return; form.result.value=form.first.value * form.second.value; } </script> and (Toggle Plain Text) <form method="post"> Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)> <p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)> <p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)> <p>Result:<input type="text" name="result" value="not calculated" ><br> </form> <form method="post"> Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)> <p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)> <p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)> <p>Result:<input type="text" name="result" value="not calculated" ><br> </form> I only tried in firefox and it didn't work.Any ideas?

Nov 24th, 2006, 11:33 AM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	You didn't copy it correctly. You're missing a logical operator between the two expressions in the "if". I didn't look beyond that. You could well get into conversion problems, auto conversion or not. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Nov 24th, 2006, 12:10 PM	#3
paulmedic555 Newbie Join Date: Jan 2005 Location: Greece Posts: 18 Rep Power: 0	Yes i didn't copy it correctly.I was missing a logical "or" operator between the expressions of "if".Now it works : (Toggle Plain Text) <script language="javascript"> function convert (form) { if ((form.first.value == "") \|\| (form.second.value =="")) return; form.result.value=form.first.value * form.second.value; } </script> <script language="javascript"> function convert (form) { if ((form.first.value == "") \|\| (form.second.value =="")) return; form.result.value=form.first.value * form.second.value; } </script> and (Toggle Plain Text) <form method="post" > Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)> <p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)></p> <p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)></p> <p>Result:<input type="text" name="result" value="not calculated" ></p><br> </form> <form method="post" > Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)> <p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)></p> <p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)></p> <p>Result:<input type="text" name="result" value="not calculated" ></p><br> </form> Sorry for the stupid post

Nov 25th, 2006, 1:59 AM	#4
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 5	it wasn't stupid...you fixed your problem. oftentimes all you need is a fresh perspective. good luck! __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

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Programming Forums > Web Development and Design > JavaScript and Client-Side Browser Scripting

simple multiply script