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Infinite Loop

Posted on 2001-09-12
Medium Priority
Last Modified: 2008-03-04
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??


Question by:benaam
LVL 75

Accepted Solution

Michel Plungjan earned 200 total points
ID: 6476279
You may trigger the onBlur on the alert

ALways use guard flags or timeout with onBlur and onFocus


Expert Comment

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.


Hope This Helps

LVL 46

Expert Comment

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)
               alert("Please enter a valid number for  " + lclMessage + "." );
               eval('document.formname.' + strFieldName + ".focus()");
               return false;
               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

ID: 6477963

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


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.

Expert Comment

ID: 7024717
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Expert Comment

ID: 7024752
A split here?

Fritz the Blank

Expert Comment

ID: 7077140
Thanks, points split.

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