Form Validation

@graatzJul 01.2005 — #well, I have a VBS function that works just fine but I'm having problems with a JS one for no good reason...

VBS code (works):

[CODE]function isNumberPeriod(strInput)
 strValid = "0123456789"
 dim hasPeriod, strTest
 for i = 1 to len(strInput)
 strTest = mid(strInput,i,1)
 if instr(strValid, strTest) = 0 then
 if strTest = "." then
 hasPeriod = hasPeriod + 1
 else
 isNumberPeriod = false
 exit function
 end if
 end if
 next
 if hasPeriod <> 1 then
 isNumberPeriod = false
 exit function
 end if
 isNumberPeriod = true
 end function[/CODE]

So in your (JS) validation function, you can use a line like:

If isNumberPeriod(document.form_name.input_name.value) {

...

Of course, since the function is VBS it won't work unless someone is using IE. Below I have the JS version that [B]doesn't work[/B] but is meant to follow the same logic as the above function

JS code ([I]doesn't work[/I])

[CODE]function isNumberPeriod(strInput) {
 var strValid = "0123456789";
 var hasPeriod = 0; 
 var strTest;
 for (var i = 0; i < strInput.length; i++) {
 strTest = strInput.charAt(i);
 if (strValid.indexOf(strTest)) == -1) {
 if (strTest == ".") {
 hasPeriod++;
 }
 else {
 return false;
 }
 }
 }
 if (hasPeriod != 1) {
 return false;
 }
 return true;
 }[/CODE]

Can anyone fix the above code? It's probably something dumb.. I'm apt to make stupid mistakes that I can't catch cuz I code in notepad :p

@crh3675Jul 01.2005 — #isNaN is a built-in function for numerics

<i>
 </i>
 
 function numHasPeriod(val){
 if(isNaN(val)){
 return false;
 }
 if(!String(val).match(/./)){
 return false;
 }   <br/>
 return true;
 }

@BigMoosieJul 01.2005 — #

String.prototype.isNumber=function(){
 return this*1==this;
 }
 
 String.prototype.lessThanTwoDecimals=function(){
 return this.indexOf(".")==this.lastIndexOf(".")
 }

Form Validation

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