empty input value jquery code example

Example 1: how can prevent the empty input in jquery

$('#form').submit(function() {
    if ($.trim($("#email").val()) === "" || $.trim($("#user_name").val()) === "") {
        alert('you did not fill out one of the fields');
        return false;
    }
});

Example 2: empty the value of an input in jquery

$('#field').val('');

Example 3: jquery select input with empty value

$('input:text').filter(function() { return $(this).val() == ""; });

Example 4: clear value input jquery

<body>
    <form method="" action="">
        <input type="text" name="email" class="input" />
        <input type="submit" value="Sign Up" class="button" />
    </form>
</body>

<script>
    $(document).ready(function() {
        $(".input").val("Email Address");
        $(".input").on("focus", function() {
            $(".input").val("");
        });
        $(".button").on("click", function(event) {
            $(".input").val("");
        });
    });
</script>

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