Solved

Infinite Loop

Posted on 2001-09-12
8
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Last Modified: 2008-03-04
HI,
I have an array of text boxes in HTML. like

text1 textamt1 textamount1

text1 textamt1 textamount1
.
.
.
text1 textamt1 textamount1

The user enters some number in textamt1 box.

I write a method display() onblur of textamt1.

So as soon as enters a valur in textamt1 and blurs I need to perform some calculations and show it in textamount3

So i write a for loop in display() method of javascript. Before calculating I need to validate that the users enter a numeric nondecimal nonnegative number. If he enters a non valid value I show him an alert and breaks the for loop. But it is going to infinite loop even though i am breaking the loop.

Wha can be the problem??

Benaam






0
Comment
Question by:benaam
8 Comments
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 50 total points
ID: 6476279
You may trigger the onBlur on the alert

ALways use guard flags or timeout with onBlur and onFocus

Michel
0
 
LVL 3

Expert Comment

by:ne0
ID: 6476686
Well, going from the above information...

Make sure that your textboxes are not named the same.

Here is a same bit of code I have used within an asp page

given that yours might look like this.
     A     +     B     =     C
___________|___________|___________
1txtamount1 1txtamount2 1txtamount3
2txtamount1 2txtamount2 2txtamount3
3txtamount1 3txtamount2 3txtamount3
   ...          ...         ...
ntxtamount1 ntxtamount2 ntxtamount3



function CheckIt(n){
tempnameA=n + "txtamount1";
tempnameB=n + "txtamount2";
tempnameC=n + "txtamount3";
document.all(tempnameC).value=eval(document.all(tempnameA).value) + eval(document.all(tempnameB).value);
}


Then just supply the first number (row number) on every texts onblur event.

onblur=CheckIt('1');..."


Hope This Helps

ne0
0
 
LVL 46

Expert Comment

by:fritz_the_blank
ID: 6476770
Here's the bit to ensure that you have a non-negative integer:



function isInteger(strFieldName, lclMessage)
{
     var lclAt, strValue="";
     strValue = eval('document.formname.' + strFieldName + '.value');
     if(strValue.length !=0)
          {
          if(isNaN(strValue))
               {
               alert("Please enter a valid number for  " + lclMessage + "." );
               eval('document.formname.' + strFieldName + ".focus()");
               return false;
               }
          else(!isNaN(strValue))
               {
               if (strValue<0)
                    {
                    alert("Please enter a positve value for " + lclMessage + ".");
                    return false;
                    }
               for (lclAt=0; lclAt < strValue.length+1; lclAt++)
                    {
                    if ((strValue.substring(lclAt,lclAt+1) == ',') || (strValue.substring(lclAt,lclAt+1) == '.'))
                         {
                         alert("Please round " + lclMessage + " to the nearest whole number (no decimals).");
                         eval('document.formname.' + strFieldName + ".focus()");
                         return false;
                         }
                    }
               }
          }
     return true;
}

Fritz the Blank
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Expert Comment

by:psogaa
ID: 6477963
benaam,

I'm guessing you only get this error in Netscape, yes?

If this is the case, the cause is indeed the alert that triggers the onblur event, causing infinite loop - as mplungian previously stated:
******************
>>You may trigger the onBlur on the alert
>>ALways use guard flags or timeout with onBlur and onFocus

>>Michel
*****************

To test if this is the problem, you could just make the onblur give an alert and nothing else:
<input type=text onblur="alert('foo');">
If the above goes in infinite loop, you've determined your problem.
0
 
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by:Moondancer
ID: 7024717
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Expert Comment

by:fritz_the_blank
ID: 7024752
A split here?

Fritz the Blank
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by:Moondancer
ID: 7077140
Thanks, points split.

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