Text field needs to validate the entered value is within the specified range from the other field in the form.

[Abhishek Barik]

HI Team,

We have a requirement to validate a text field within the specified range from the other field in the form. Fr ex if the field "a" has a IP range of "192.168.1.0/24" , the other field "b" should be between 0-24 with a valid IP address. Ex: between 192.168.1.1 to 102.168.1.24

Please help in the script.

Thanks in advance,

Abhishek

[Hitoshi Ozawa]

Hi Abhishek,

I got the basic idea but is the question correct? "/24" implies subnet mask 255.255.255.0. This implies valid ip address range from 192.168.1.0/24 to 192.168.1.1 0 192.168.1.254.

[Hitoshi Ozawa]

Here is the script that will validate ip address with CIDR.

1. Since IP address and IP address with CIDR may be used often, created following Regex. (Service Catalog > Catalog Variables > Variable Validation Regex)
1. IPv4
   

   ^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$​

2. IPv4 with subnet mask
   

   ^([01]?\d\d?|2[0-4]\d|25[0-5])(?:\.[01]?\d\d?|\.2[0-4]\d|\.25[0-5]){3}(\/[0-2]\d|\/3[0-2])$​

2. Define fields "a" and "b". Set Validation Regex on field "a" to "IPv4 with subnet mask" and field "b" to "IPv4"
3. Define Client Script on field "b"
   

   function onChange(control, oldValue, newValue, isLoading) {
       if (isLoading || newValue == '') {
           return;
       }
   
       var range = getIpRangeFromAddressAndNetmask(g_form.getValue('a'));
       var start = range[0];
       var end = range[1];
       if (newValue > end || newValue < start) {
           g_form.showFieldMsg('b', 'ip address is not permitted by subnet mask.', 'error');
       }
   
   
       function getIpRangeFromAddressAndNetmask(str) {
           var part = str.split("/"); // part[0] = base address, part[1] = netmask
           var ipaddress = part[0].split('.');
           var netmaskblocks = ["0", "0", "0", "0"];
           if (!/\d+\.\d+\.\d+\.\d+/.test(part[1])) {
               // part[1] has to be between 0 and 32
               netmaskblocks = ("1".repeat(parseInt(part[1], 10)) + "0".repeat(32 - parseInt(part[1], 10))).match(/.{1,8}/g);
               netmaskblocks = netmaskblocks.map(function(el) {
                   return parseInt(el, 2);
               });
           } else {
               // xxx.xxx.xxx.xxx
               netmaskblocks = part[1].split('.').map(function(el) {
                   return parseInt(el, 10);
               });
           }
           // invert for creating broadcast address (highest address)
           var invertedNetmaskblocks = netmaskblocks.map(function(el) {
               return el ^ 255;
           });
           var baseAddress = ipaddress.map(function(block, idx) {
               return block & netmaskblocks[idx];
           });
           var broadcastaddress = baseAddress.map(function(block, idx) {
               return block | invertedNetmaskblocks[idx];
           });
   
           if (baseAddress[3] == 0) {
               baseAddress[3] = 1;
           }
           if (broadcastaddress[3] == 255) {
               broadcastaddress[3] = 254;
           }
   
           return [baseAddress.join('.'), broadcastaddress.join('.')];
       }
   }​

Execution:

Case 1: Valid IP address

Case 2: Invalid IP address

[Abhishek Barik]

Hi @Hitoshi Ozawa ,

"/24" is not a subnet mask. it means "0-24" range at the end of IP like 192.168.1.1 - 192.168.1.24. Anything above 24 will be error like 192.168.1.25.

Could you please remodify the script and update please?

Thanks,

Abhishek

[Hitoshi Ozawa · Accepted solution]

So it's not a CIDR.

It'll be much easier.

Create a regex like below for field "a"

^([01]?\d\d?|2[0-4]\d|25[0-5])(?:\.[01]?\d\d?|\.2[0-4]\d|\.25[0-5]){3}(\/([01]?\d\d?|2[0-4]\d|25[0-5]))$

Client Script

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading || newValue == '') {
        return;
    }
    try {
        var mask = g_form.getValue('a').split('/');
        var end = mask[1];

		var maskOctet = mask[0].split('.');
        var endOctet = newValue.split('.');
		for (var i=0; i<3; i++) {
			if (maskOctet[i] != endOctet[i]) {
				g_form.showFieldMsg('b', 'invalid ip address.', 'error');
				return;
			}
		}
		if (endOctet[3] < 1 || endOctet[3] > end) {
			g_form.showFieldMsg('b', 'invalid ip address.', 'error');
		}
    } catch (e) {
        alert(e.message);
    }
}