Evaluating a string or object for compatibility

In my possession, I have a PHP array that has been encoded in JSON format:

<script>
var registeredEmails = <?php echo(json_encode($emails)); ?>;
</script>

To verify that this is functioning properly, I conduct the following test:

console.log(registeredEmails);
// This results in: ["<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="bbd1d4d3d5fbdfd4d6dad2d595d8d4d6">[email protected]</a>", "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7d101c0f043d1912101c1413531e1210">[email protected]</a>"]

My objective now is to iterate through the JSON data and compare a specific string against all the strings it contains.

for (var email in registeredEmails) {
    if (registeredEmails.hasOwnProperty(email)) {

        var duplicate = registeredEmails[email];

        console.log(duplicate + ' is typeof: ' + typeof(duplicate));
        // This shows: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0c666364624c6863616d6562226f6361">[email protected]</a> is typeof: string

        //  $(this).val() holds a string from another source
        if (duplicate.test($(this).val())) {
            // A match has been found
        };
    }
}

It appears that the test() method is for checking string matches. I have checked and confirmed that my variable duplicate is a string, but it seems to still be recognized as an object. An error in JavaScript is returned:

Uncaught TypeError: Object <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2c464344426c4843414d4542024f4341">[email protected]</a> has no method 'test'

What could be the reason for this occurrence?

javascript

Answer №1

test() is a method that belongs to the RegEx object, and not the String object.

If you're looking to search within a string without using Regular Expressions, your best option would be to utilize String.search(). Alternatively, you can consider using String.indexOf().

Answer №2

When utilizing json_encode, it appears that your console output seems like an array. In this scenario, you may consider implementing the following solution:

var located = discover_match( registeredEmails, $(this).val() );

if( located ) {
   // found a match
}

function discover_match(collection, text) {

    for( var i = 0, length = collection.length; i < length ; i++ ) {
        if( collection[i].indexOf( text ) > -1 ) return true;
    }

    return false;
}​

Check out the Fiddle here

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