jQuery .keyup() vs .change() vs .bind()

I’ve found that using .keyup() in jQuery doesn’t always work like I want. For example, if I want to ensure that a user can’t put a special character into an input field I want to check for that character every time the input changes. Only using .keyup() allows someone to right-click and paste a bad value in.

Instead I use .bind(“change keyup input”) to catch all changes on an input field, regardless of how they are done.

For example:

// detect the change
$('input#myId').bind("change keyup input",function() {
    // if there's a bad value
    if (this.value.match(/[^a-zA-Z0-9\-_\s]/g)) {
        // replace it with nothing
        this.value = this.value.replace(/[^a-zA-Z0-9\-_\s]/g, '');

Pretty simple, eh?

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Eric is a jack of all trades. From running social networks to internet cafes, he’s been in the startup scene for almost a decade. Recently returned from a stint at Start-Up Chile, Eric spends his days focusing on his startups Backup Box and Surreal WiFi.

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  • http://www.philwebservices.com/ web design philippines

    Well, thanks for this. I hope it will work on mine.

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  • Anders Sjöqvist

    Is there a reason to first check for matches before doing the replacement? Would calling replace() immediately be less performant or does it trigger more events?

  • Michael Hjulskov

    Thanks for sharing
    I think you can also use
    .on(‘keyup paste change input’)
    and get the same result, right?

  • Josua Obando Cortés


    $(“input#id”).bind(‘change keyup input’,function(e){})

  • Piesho Nais

    What if there are no changes in the fields because they have default values (e.g. database values)? How do you calculate that? And, at the same time, the user can change any of those values to let jQuery recalculate.