code to allow negative numbers(no special charcaters,no decimal,no letters)

[Ganeshkumar cheekati]

Hi
Can anybody provide me the code to accept only negative numerics which doesnot allow special characters, decimals and letters?


Thanks
Ganesh Kumar CH

[Bear Bibeault]

Where is your code? What problems are you having with it? CodeRanch is NotACodeMill.

[Ganeshkumar cheekati]

function allow_numericandminus_Tracking(obj){
if (!/^\d+(\d*)?$/.test(obj.value)){
obj.value= theVal = obj.value.replace(/[^0-9.]/g,''); //alert(theVal);
if(theVal>""){
obj.value=parseFloat("0"+theVal);
obj.focus()
}
}
}
above code is not allowing hyphen so please guide how to change the regular expression?

[Eric Pascarello]

/    : start of reg exp
^    : beginning of string
-    : negitive
?    : optional
\d   : number
+    : one or more
$    : end of string
/    : end of reg exp

put it together

var re = /^-?\d+$/;

Eric