CODEWITHSUNDEEP
javascriptregex
Sai Krishna
Sai Krishna

Reputation: 43

How to allow only a certain set of domains in javascript and throw an alert if its not matchin?

I need to validate if the url entered in the textbox is a valid domain by comparing it with a set of valid domains and return an alert if its not matching. Can you please help me with this ?

The URL should be of the format http://www..abc.com/cdef.. http://www..xyz.com etc..

I have tried using this regex: 

regex = /((http|https):\/\/)(www.)?([a-zA-Z0-9]+).((abc.com)|(xyz.com)).*/

but its not yielding proper results. Hope this info helps.

Upvotes: 0

Views: 251

Answers (2)

wonghenry
wonghenry

Reputation: 689

This is a basic programming exercise. You can use a put your urls in an array and then loop through them to check against what you entered.

Here's a jsfiddle of something I hack together quickly. Learn to write it yourself afterwards and you can hack together small programs to help you do mundane tasks. 

var listOfUrl = [
 'www.yahoo.com', 
 'www.google.com',
 'www.bing.com'
 //enter more url here...
 ];


 for(var i = 0; i <= listOfUrl.length; i++) {
   if(listOfUrl[i] === enteredUrl){
   document.getElementById('result').innerHTML = 'there is a match';
   return;
 }

http://jsfiddle.net/henryw4k/5mogf06t/

Upvotes: 0

Yeldar Kurmangaliyev
Yeldar Kurmangaliyev

Reputation: 34189

You can do this using JavaScript URL object and its host property:

function isAllowed(urlString)
{
    var allowed = ['example.com', 'stackoverflow.com', 'google.com'];
    var urlObject = new URL(urlString);

    return allowed.indexOf(urlObject.host) > -1;
}

console.log(isAllowed('http://example.com/path/?q=1')); // true
console.log(isAllowed('https://subdomain.example.com/')); // false
console.log(isAllowed('http://stacksnippets.net')); // false

if (!isAllowed(document.getElementById('yourTextbox').value))
{
    alert('Domain is not allowed!');
}

Note that it may not work in all browsers.
Check the compatibility table in the given reference.

Upvotes: 1

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