Help! [Archive] - Dynamic Drive Forums

jstestpager

03-15-2008, 04:53 AM

I have an input named address in a form named customerform and am trying to validate that it contains numbers. But if I were to enter 22222 Pine Way it gives the error message, but 67845 Alfa St would work fine because it has two unique numbers. Why do I need two numbers and how can I change this? Here is the script:
_test_000 = "0"
_test_00 = "1"
_test_01 = "2"
_test_02 = "3"
_test_03 = "4"
_test_04 = "5"
_test_05 = "6"
_test_06 = "7"
_test_07 = "8"
_test_08 = "9"
address_name = document.customerform.address.value
if((address_name.indexOf(_test_000) <= 0) && (address_name.indexOf(_test_00) <= 0) && (address_name.indexOf(_test_01) <= 0) && (address_name.indexOf(_test_02) <= 0) && (address_name.indexOf(_test_03) <= 0) && (address_name.indexOf(_test_04) <= 0) && (address_name.indexOf(_test_05) <= 0) && (address_name.indexOf(_test_06) <= 0) && (address_name.indexOf(_test_07) <= 0) && (address_name.indexOf(_test_08) <= 0)) {
//error message
}

Bob90

03-15-2008, 01:01 PM

You really should get in to the habit of using javascripts built-in functions. Regular Expressions, or regExp for short, are convienient functions for searching for strings (words or numbers).

<HTML>
<HEAD>
<SCRIPT type="text/javascript">
function checkNum(inputId) {

//get the form object from its ID.
inputObj = document.getElementById(inputId);

//Set up a 'regular expression' to search for 1 or more numbers. '\d' searches for a number, '+' searches for 1 or more occurences
var re = /\d+/;

//Use the regular expression on the string. In this case the string is the objects value (address.value = 11 parsons drive in this example). If there are numbers then the value of containsNum = true;
var containsNum = inputObj.value.match(re);

//Use the value true or false to determine what to alert to the user.
var alertText = containsNum ? "Contains numbers" : "Doesn't contain numbers";

//alert the user.
alert(alertText);

}
</SCRIPT>
</HEAD>
<BODY>
<form id="customerform">
<input id="address" type="text" value="11 Parsons Drive">
<input type="button" value="Check" onclick="checkNum('address')">
</form>
</BODY>
</HTML>