input validation

Question

How can I check that an input textbox has a float value with no more than 3 places after the point in javascript?

Answer 1

check this

Answer 2

if (textbox.value.match(/\d+(\.\d{1,3})?/) {
}

Answer 3

Multiply it by 1000, subtract the rounded value, and check if it's bigger than 0?

Answer 4

/^\d*\.\d{0,3}$/.test(field.value);  // returns true if valid, otherwise returns false

Answer 5

thank u guys But i made the solution in a much simpler way : 1st wrote this function ----> //Checking A value is 3 decimal palce or not

function chkplace3(ctrl,msg) {

var dot="."
var val = ctrl.value;
var len=val.length
var ldot=val.indexOf(dot)
var diff=(len-ldot)
if(diff>4)
{
 alert(msg + ' can not be more than 3 numeric places');
 ctrl.focus();
 return false;
}
return true;

}

and then calling with the reqd parameter from the form --->

if(!chkplace3(document.from.txtfield,'msg')) { return false; }