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Disable an onChange

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Quasibobo

Quasibobo

Programmer
Oct 11, 2001
168
NL
Hi,

I have some formfields with an onChange="checkNeg()"
The form itself has an onSubmit="return(Verify())"

This function looks like this:
Code: 
function Verify(){
if (!checkNeg() || !checkValues())
    {
     return(false);
    }
return (true);
}
But what happens when I hit 'ENTER' in a formfield:
the onChange="checkNeg()" runs AND the onSubmit="return(Verify())" runs.... so the alertmassages from the checkNeg() function appears twice.

Is there a way to disable onChange when submitting the form (by hitting the ENTER-button)?

Don't eat yellow snow!
 
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why are u calling the function in onsubmit again???

Known is handfull, Unknown is worldfull
 
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Just making sure no negative values are submitted...

Everyime a formfield gets a value, the onChange activates the checkNeg()-function. But after the alert-message ('Don't use negative values!'), the user can ignore this message and skip to the next field using his mousepointer.

So I need to check the whole form for negative values when the form is submitted.

Tu comprends?

Don't eat yellow snow!
 
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but wont onchange already validate all fields? try removing the validation from ur form submit. It should still have the same functionality...

Known is handfull, Unknown is worldfull
 
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yes... it validates the field, but the user can decide to ignore the alertmessage. He can easily click in the next textfield without changing the negative value.

So I need to run this checkNeg() again when submitting...

Don't eat yellow snow!
 
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easy way:
validate only during submit

tough way:
can i have a sample HTML output???

Known is handfull, Unknown is worldfull
 
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Easy way:
Ok.... I'll disable the ENTER-key (or ENTER = next formfield (like TAB)).

Tough way:
Here's the code (the function have other names than I mentioned in de posts!!)

Code: 
<html>
<head>
<title>Bestellen per lijst</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" href="includes/stylesheet.css" type="text/css">
<script type="text/javascript">
<!--
function selectElement(k) {
		var obj = document.forms['invoeren'].elements['besteld_' + k];
		obj.select();
	}

function LeegVeldControle(){
for(j=0;j<document.forms['invoeren'].elements.length;j++)
	{
	if (document.forms['invoeren'].elements[j].type != 'hidden')
		{
		if(document.forms['invoeren'].elements[j].value.length==0)
			{
			alert('Vul hier wat in!\n(Dit kan bijvoorbeeld ook 0 zijn)');
			document.forms['invoeren'].elements[j].select();
			return(false);
			}
		}
	}
//return confirm('Alles klopt?');
return (true);
}

function checkNegatief(i){
a = parseFloat(document.forms['invoeren' ].elements['besteld_' + i].value);
if (a<0)
	{
	alert('Vul geen negatieve getallen in!');
	setTimeout('selectElement('+i+');', 1);
	}
}

function checkSubmitNegatief(){

for(j=0;j<document.forms['invoeren'].elements.length;j++)
	{
	if (document.forms['invoeren'].elements[j].type != 'hidden')
		{
		a = parseFloat(document.forms['invoeren' ].elements[j].value);
		if (a<0)
			{
			alert('Vul geen negatieve getallen in!');
			document.forms['invoeren'].elements[j].select();
			return(false);
			}
		}
	}
return (true);
}

function Controle(){

if (!LeegVeldControle() || !checkSubmitNegatief())
	{
	return false;
	}
return true;
}
//-->
</script>
</head>
<body onLoad="document.forms[0].elements[0].select();">
<table border="0" cellspacing="1" align="center">
<form name="invoeren" action="bestellen_per_lijst.php" method="post" onSubmit="return Controle()">
<tr>
 <td align="center" colspan="7"><font size="5"><b>Bestellen per lijst</b></font></td>
</tr>
<tr>
 <td colspan="7" align="right"><font size="4"><b>c1</b></font></td>
</tr>
<tr class="tabelhoofd">
 <td>&nbsp;Boekcode&nbsp;</td>
 <td>&nbsp;ISBN&nbsp;</td>
 <td>&nbsp;Voorraad&nbsp;</td>
 <td>&nbsp;Besteld&nbsp;</td>
 <td>&nbsp;Bestellen&nbsp;</td>
 <td>&nbsp;Titel</td>
 <td align="right">&nbsp;Auteur</td>
</tr>
 <tr class="table_row_color_1a">
  <td align="center">c1-1</td>
  <td width="80" align="center">9013007651</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_1" value="0" size="3" style="text-align:center" onChange="checkNegatief(1)"><input type="hidden" name="ISBN_1" value="9013007651"></td>
   <td width="*">&nbsp;Communicatiekaart van Nederland&nbsp;</td><td align="right">&nbsp;Bakker&nbsp;</td>
 </tr>
 <tr class="">
  <td align="center">c1-2</td>
  <td width="80" align="center">9001517641</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_2" value="0" size="3" style="text-align:center" onChange="checkNegatief(2)"><input type="hidden" name="ISBN_2" value="9001517641"></td>
   <td width="*">&nbsp;Basisboek Journalistiek&nbsp;</td><td align="right">&nbsp;Kussendrager&nbsp;</td>
 </tr>
 <tr class="table_row_color_1a">
  <td align="center">c1-3</td>
  <td width="80" align="center">904170499X</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_3" value="0" size="3" style="text-align:center" onChange="checkNegatief(3)"><input type="hidden" name="ISBN_3" value="904170499X"></td>
   <td width="*">&nbsp;Trouw schrijfboek&nbsp;</td><td align="right">&nbsp;Berg&nbsp;</td>
 </tr>
 <tr class="">
  <td align="center">c1-4</td>
  <td width="80" align="center">9001400167</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_4" value="0" size="3" style="text-align:center" onChange="checkNegatief(4)"><input type="hidden" name="ISBN_4" value="9001400167"></td>
   <td width="*">&nbsp;Samenvatten&nbsp;</td><td align="right">&nbsp;Hogen&nbsp;</td>
 </tr>
 <tr class="table_row_color_1a">
  <td align="center">c1-5</td>
  <td width="80" align="center">9001163874</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_5" value="0" size="3" style="text-align:center" onChange="checkNegatief(5)"><input type="hidden" name="ISBN_5" value="9001163874"></td>
   <td width="*">&nbsp;Taaltopics: Formuleren&nbsp;</td><td align="right">&nbsp;Braas&nbsp;</td>
 </tr>
 <tr class="">
  <td align="center">c1-6</td>
  <td width="80" align="center">9001163890</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_6" value="0" size="3" style="text-align:center" onChange="checkNegatief(6)"><input type="hidden" name="ISBN_6" value="9001163890"></td>
   <td width="*">&nbsp;Taaltopics: Spelling&nbsp;</td><td align="right">&nbsp;Braas&nbsp;</td>
 </tr>
 <tr class="table_row_color_1a">
  <td align="center">c1-7</td>
  <td width="80" align="center">905333775X</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_7" value="0" size="3" style="text-align:center" onChange="checkNegatief(7)"><input type="hidden" name="ISBN_7" value="905333775X"></td>
   <td width="*">&nbsp;Religie in een Notendop&nbsp;</td><td align="right">&nbsp;Hondebrink&nbsp;</td>
 </tr>
 <tr class="">
  <td align="center">c1-8</td>
  <td width="80" align="center">9001181279</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_8" value="0" size="3" style="text-align:center" onChange="checkNegatief(8)"><input type="hidden" name="ISBN_8" value="9001181279"></td>
   <td width="*">&nbsp;De economie in Nederland&nbsp;</td><td align="right">&nbsp;Buunk&nbsp;</td>
 </tr>
 <tr class="table_row_color_1a">
  <td align="center">c1-9</td>
  <td width="80" align="center">9001902006</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_9" value="0" size="3" style="text-align:center" onChange="checkNegatief(9)"><input type="hidden" name="ISBN_9" value="9001902006"></td>
   <td width="*">&nbsp;Wisselwerk&nbsp;</td><td align="right">&nbsp;Mezach&nbsp;</td>
 </tr>
 <tr class="">
  <td align="center">c1-10</td>
  <td width="80" align="center">9059401158</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_10" value="0" size="3" style="text-align:center" onChange="checkNegatief(10)"><input type="hidden" name="ISBN_10" value="9059401158"></td>
   <td width="*">&nbsp;Handboek Internetresearch&nbsp;</td><td align="right">&nbsp;Dasselaar&nbsp;</td>
 </tr>
 <tr class="table_row_color_1a">
  <td align="center">c1-11</td>
  <td width="80" align="center">9051896328</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_11" value="0" size="3" style="text-align:center" onChange="checkNegatief(11)"><input type="hidden" name="ISBN_11" value="9051896328"></td>
   <td width="*">&nbsp;Beleidsterreinen van de lagere overheid&nbsp;</td><td align="right">&nbsp;Pollemans&nbsp;</td>
 </tr>
 <tr class="">
  <td align="center">c1-12</td>
  <td width="80" align="center">906283373X</td>  <td align="center">0</td><td align="center">0</td>  <td align="center"><input type="text" name="besteld_12" value="0" size="3" style="text-align:center" onChange="checkNegatief(12)"><input type="hidden" name="ISBN_12" value="906283373X"></td>
   <td width="*">&nbsp;Bestuurlijke kaart van Nederland&nbsp;</td><td align="right">&nbsp;Neelen&nbsp;</td>
 </tr>
 
<tr>
 <td colspan="7"><input type="hidden" name="verder" value="bestellen"><input type="hidden" name="lijst" value="c1">&nbsp;</td>
</tr>
<tr>
 <td colspan="7" align="center"><input type="submit" name="submit" value="Bestellen" style="width:90px">&nbsp;&nbsp;&nbsp;<input type="reset" value="Wissen" style="width:90px"></td>
 </tr>
<tr>
 <td colspan="7"><a href="javascript:history.back()">Terug</a></td>
 </tr>
</table>
</body>
</html>

Don't eat yellow snow!
 
Upvote 0 Downvote
er,
can u give me with the onchange event? its all greek and latin to me...

Known is handfull, Unknown is worldfull
 
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I changed the script with the ENTER disabled.
It's fine now... thanks anyway!

BTW.... it's not greek or latin, it's dutch ;)

Don't eat yellow snow!
 
Upvote 0 Downvote
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