Validate textboxes using event handler registration

**papote** · 09-25-2014, 12:36 PM

I have a piece of JavaScript code that should validate that a username field is not empty or null and that a telephone field is in the correct format using event handler registration. It seems to be validating fine but if there is an error it still manages to submit.

HTML

Code:

<html>
    <head> 
        <script type = "text/javascript"  src = "js/validator.js" >
        </script>
    </head>

    <body>

        <form id = "decorForm" action = "">
            <table border = "0">
                <tr>
                    <th>Username: </th>
                    <td>
                        <input type = "text"  id = "myUserName" size = "15" maxlength = "15"/>
                    </td>
                </tr>

                <tr>
                    <th>Telephone: </th>
                    <td>
                        <input type = "text" id = "telephone" name = "telephone" size = "15" maxlength = "13"/>
                        <br />
                        (999)999-9999
                    </td>
                </tr>

                <tr>
                    <td>
                        <input type = "submit" value = "Submit" />
                    </td>
                    <td>
                        <input type = "reset" value = "Reset" />
                    </td>
                </tr>

            </table>

        </form>

        <script type = "text/javascript"  src = "js/validatorr.js" >
        </script>

    </body>
</html>

JAVASCRIPT (validator.js)

Code:

function chkUser() {
// Verifies that the UserName field is not empty.
    var myUserName = document.getElementById("myUserName");
    if (myUserName.value == ""  || myUserName.value == null) {
        alert ("Please enter a Username!");
        return false;
    } else {
        return true;
    }
}

function chkTelephone() {
// Verifies that the Telephone field value is in the correct format.
    var tel = document.getElementById("telephone");
    var pos = tel.value.search(/^\(\d{3}\)\d{3}-\d{4}$/);
    if (pos != 0) {
        alert ("Please enter telephone number in the following format: (999)999-9999");
        return false;
    } else {
        return true;
    } 
}

function chkFields() {
// Verifes all fields and returns boolean to event handler
// The event handler function
    if (chkUser() && chkTelephone()) {
        return true;
    } else {
        return false;
    }
}

JAVASCRIPT (validatorr.js)

Code:

//Register the event handlers for validator.js
document.getElementById("decorForm").onSubmit = chkFields;

I am trying to use this as an example.

**jscheuer1** · 09-25-2014, 02:08 PM

There could also be other problems, but in javascript there is no event onSubmit. It's onsubmit. So before anything else can work or not work, this:

Code:

//Register the event handlers for validator.js
document.getElementById("decorForm").onSubmit = chkFields;

Needs to be:

Code:

//Register the event handlers for validator.js
document.getElementById("decorForm").onsubmit = chkFields;

**papote** · 09-25-2014, 07:52 PM

I can't believe a little case insensitive was driving me nuts.
Thanks.

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