javascript - Cross browser keydown handling of carriage return? - Stack Overflow

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I'm looking for a cross browser solution to handling carriage return, to submit input from a text box.

My current issue is firefox...

javascript event is not defined

<input id="myinput" type="text" onkeydown="press();" value="X"/>

<script type="text/javascript">
function press() {
    if (event.keyCode == 13) {
    // do something
    }
}
<script>

I can use jquery.

I'm looking for a cross browser solution to handling carriage return, to submit input from a text box.

My current issue is firefox...

javascript event is not defined

<input id="myinput" type="text" onkeydown="press();" value="X"/>

<script type="text/javascript">
function press() {
    if (event.keyCode == 13) {
    // do something
    }
}
<script>

I can use jquery.

• javascript
• jquery
• cross-browser

Share Improve this question Follow asked Apr 17, 2012 at 8:43 JulesJules 7,7741616 gold badges106106 silver badges195195 bronze badges 1

• 2 If you can use jQuery you should use it to attach the event handlers as well, rather than using inline attributes. – Anthony Grist Commented Apr 17, 2012 at 8:52

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 8

Where does event e from? :-)

Here is the solution you're looking for:

// First, change the HTML to:
<input id="myinput" type="text" onkeydown="return press( event );" value="X" />

// Then, on the JS part:
function press( e ) {
    var evt = e || window.event
    // "e" is the standard behavior (FF, Chrome, Safari, Opera),
    // while "window.event" (or "event") is IE's behavior
    if ( evt.keyCode === 13 ) {
        // Do something

        // You can disable the form submission this way:
        return false
    }
}

Note the use of return in this function and the HTML event to prevent the form from submitting (which is the default behavior when you press [Enter] in a form's field).

However, I'd remend removing the javascript part in the HTML, and go straight with:

document.getElementById('myinput').onkeydown = function( e ) {
    // Your code
}

This allows you to have unobtrusive javascript

For the jQuery way, this'd be the following:

$('#myinput').on( 'keydown', function( e ) {
    // jQuery normalizes the "e" parameter, so you can use:
    if ( e.keyCode === 13 ) {
        // Do something
    }
} )

P.S.: event is actually the same as window.event, which is the correct use for IE. This is not the standard though, which other browsers (FF, Chrome...) use. Which is why we use the trick provided (var evt = e || window.event, where e was passed as argument).

first of all, you must define event for the use in FF/Chrome/Opera/.. in the function definition and in the function call. (onkeydown)

HTML:

<form method="POST" action="/">
<input id="myinput" type="text" onkeydown="return press( event )" value="X"/>
</form>

JavaScript:

function press(e) {
    // IE uses "window.event", others pass the event as argument
    var evt = e || window.event;
    if (evt.keyCode == 13) {
        // do something
        alert("enter!");

        return false;
    }
}

Note the use of return in both the function definition and the function call in the HTML markup. It prevents the form from submitting, which is the default behaviour when you hit enter in an input inside a form.

$('#myinput').keypress(function(e){
      if(e.which == 13){
         //do something.
         e.preventDefault();
       }  
});

You need to declare the event parameter that will be passed to your function:

function press(event) {
    if (event.keyCode == 13) {
    // do something
    }
}

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