Custom Alert When Checking Data Input, Javascript

Question

I would like to display a custom alert, rather than simply true or false. I have:

function isValid(test) {

     return /^[a-zA-Z]{2}(?:\d{6}|\d{8}|\d{10})$/.test(test);
}

function checkValid(){

     var userEntry = document.getElementById("entry1").value;

     alert(isValid(firstRef));

}

So depending on whether what the user is valid or not they get the message "true" or "false". I would like the user to get a customised message if their input returns false such as "Invalid format try again" and get no message displayed when they input the correct data. Could I somehow use an if statement along the lines of if true then.... else...?

I did try but for some reason couldn't get it to work for me. Probably some silly mistake, not been doing this for that long. — Stumf
– Stumf, Commented Aug 26, 2011 at 0:39

JJ. · Accepted Answer · 2011-08-26 00:36:35Z

2

function checkValid(){

     var userEntry = document.getElementById("entry1").value;

     if (!isValid(firstRef)) {
         alert("Invalid format try again.");
     }

}

answered Aug 26, 2011 at 0:36

JJ.

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Comments

iurisilvio · Accepted Answer · 2011-08-26 00:45:47Z

1

Change your checkValid function to something like this one:

function checkValid(){

    var userEntry = document.getElementById("entry1").value;

    if (isValid(firstRef)) {
        alert("It is valid!");
    }
    else {
        alert("It is invalid");
    }
}

answered Aug 26, 2011 at 0:45

iurisilvio

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