Detecting arrow key presses in JavaScript-第2页回答

How do I detect when one of the arrow keys are pressed? I used this to find out:

function checkKey(e) {
    var event = window.event ? window.event : e;
    console.log(event.keyCode)
}

Though it worked for every other key, it didn't for arrow keys (maybe because the browser is supposed to scroll on these keys by default).

标签： javascript keypress keyboard-events

16条回答

临风纵饮

2楼-- · 2018-12-31 21:49

I've been able to trap them with jQuery:

$(document).keypress(function (eventObject) {
    alert(eventObject.keyCode);
});

An example: http://jsfiddle.net/AjKjU/

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素衣白纱

3楼-- · 2018-12-31 21:50

That's shorter.

function IsArrows (e) { return (e.keyCode >= 37 && e.keyCode <= 40); }

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余生请多指教

4楼-- · 2018-12-31 21:53

That is the working code for chrome and firefox

<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"></script>

<script type="text/javascript">

    function leftArrowPressed() {
      alert("leftArrowPressed" );
      window.location = prevUrl  
    }

    function rightArrowPressed() {
      alert("rightArrowPressed" );
      window.location = nextUrl  
    }
    function topArrowPressed() {
      alert("topArrowPressed" );
      window.location = prevUrl  
    }

    function downArrowPressed() {
      alert("downArrowPressed" );
      window.location = nextUrl  
    }

        document.onkeydown = function(evt) {
                        var nextPage = $("#next_page_link")
                        var prevPage = $("#previous_page_link")
                        nextUrl = nextPage.attr("href")
                        prevUrl = prevPage.attr("href")
        evt = evt || window.event;
        switch (evt.keyCode) {
                case 37:
                leftArrowPressed(nextUrl);
                break;

                case 38:
                topArrowPressed(nextUrl);
                break;

                 case 39:
                rightArrowPressed(prevUrl);
                break;

                case 40:
                downArrowPressed(prevUrl);
                break;

        }
    };


</script>
</head>
<body>
<p>
<a id="previous_page_link" href="http://www.latest-tutorial.com">Latest Tutorials</a> 
<a id="next_page_link" href="http://www.zeeshanakhter.com">Zeeshan Akhter</a>
 </p>
</body>
</html>

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浅入江南

5楼-- · 2018-12-31 21:54

I was also looking for this answer until I came across this post.

I've found another solution to know the keycode of the different keys, courtesy to my problem. I just wanted to share my solution.

Just use keyup/keydown event to write the value in the console/alert the same using event.keyCode. like-

console.log(event.keyCode) 

// or

alert(event.keyCode)

- rupam

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呛了眼睛熬了心

6楼-- · 2018-12-31 21:54

control the Key codes %=37 and &=38... and only arrow keys left=37 up=38

function IsArrows (e) {
   return ( !evt.shiftKey && (e.keyCode >= 37 && e.keyCode <= 40)); 
}

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怪性笑人.

7楼-- · 2018-12-31 21:55

On key up and down call function. There are different codes for each key.

document.onkeydown = checkKey;

function checkKey(e) {

    e = e || window.event;

    if (e.keyCode == '38') {
        // up arrow
    }
    else if (e.keyCode == '40') {
        // down arrow
    }
    else if (e.keyCode == '37') {
       // left arrow
    }
    else if (e.keyCode == '39') {
       // right arrow
    }

}

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Detecting arrow key presses in JavaScript

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