contact form require to fill one of two fields

Question

I want to create a contact form in WordPress where one of two fields must be filled to send. For example - e-mail and telephone number are required, but if a user fills just one field then it will be ok.

Answer 1

This depends on how you want to validate it.

PHP? You could do something like:

if ( empty($_POST['name1']) && empty($_POST['name2']) ) {
    // Error message
}

JS? You could do something like:

var input1Val = document.getElementsByName('name1')[0].value;
var input2Val = document.getElementsByName('name2')[0].value;

if ( input1Val.length > 0 || input2Val.length > 0 ) {
    // Allow submission
}

Answer 2

`$(document).ready(function () {

    $('#forgot_pass_form').validate({ // initialize the plugin
        groups: {
            names: "uname email"
        },
        rules: {
            uname: {
                require_from_group: [1, ".send"]
            },
            email: {
                require_from_group: [1, ".send"]
            }
        },
        submitHandler: function (form) { // for demo
            alert('valid form submitted'); // for demo
            return false; // for demo
        }
    });

    jQuery.extend(jQuery.validator.messages, {
        require_from_group: jQuery.format("'Please enter either username/ email address to recover password'/Please fill out at least {0} of these fields.")
    });

});`

And html

<form action="#" class="send_form" id="forgot_pass_form" method="POST">
    <fieldset>
        <div class="send_row">
            <label class="padding-top10">Email</label>
            <input type="text" class="send_email send" id="email" name="email"
            /> <em>You need to type an email address</em>

        </div>
        <div class="send_row option">OR</div>
        <div class="send_row">
            <label class="padding-top10">Username</label>
            <input type="text" class="send_username send" id="uname"
            name="uname" />
        </div>
        <div class="send_row send_submitforgotuser">
            <input type="submit" value="Submit" />
        </div>
    </fieldset>
</form>
<a id="docs" href="http://docs.jquery.com/Plugins/Validation" target="_blank">Validation Documentation</a>

Working demo: http://jsfiddle.net/sgmvY/1/

Answer 3

Validating form without js, needs developing your own form plugin.

Here is one article about it.

Change validation logic to be aware of logical OR in these two fields.