Handle arrow key, control, alt : Key Event « Event « JavaScript DHTML






  1. JavaScript DHTML
  2. Event
  3. Key Event

Handle arrow key, control, alt

 
<!-- 
     Example File From "JavaScript and DHTML Cookbook"
     Published by O'Reilly & Associates
     Copyright 2003 Danny Goodman
-->
function handleArrowKeys(evt) {
    evt = (evt) ? evt : ((window.event) ? event : null);
    if (evt) {
        var top = getElementStyle("moveableElem", "top", "top");
        var left = getElementStyle("moveableElem", "left", "left");
        var elem = document.getElementById("moveableElem");
        switch (evt.keyCode) {
            case 37:
                elem.style.left = (parseInt(left) - 5) + "px";
                break;    
            case 38:
                elem.style.top = (parseInt(top) - 5) + "px";
                break;    
            case 39:
                elem.style.left = (parseInt(left) + 5) + "px";
                break;    
            case 40:
                elem.style.top = (parseInt(top) + 5) + "px";
                break;    
         }
    }
}

document.onkeyup = handleArrowKeys;

----------

function handleAccelerator(evt) {
    evt = (evt) ? evt : ((window.event) ? event : null);
    if (evt) {
        if (evt.keyCode == 80 && evt.ctrlKey && evt.altKey) {
            runSpecial();
        }
    }
}

document.onkeyup = handleAccelerator;

----------

function showHelp(elem) {
    var elemID = elem.id;
    switch (elemID) {
        case "name":
            alert("Enter your full name.");
            break;
        case "email":
            alert("We will be contacting you with your access code. \n" +
                   "Make sure the address is accurate and up to date.");
            break;
        ...
    }
}

function handleAccelerator(evt) {
    evt = (evt) ? evt : ((window.event) ? event : null);
    var elem = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
    if (evt) {
        // for Ctrl+Alt+F2
        if (evt.keyCode == 113 && evt.ctrlKey && evt.altKey) {
            showHelp(elem);
        }
    }
}
document.onkeyup = handleAccelerator;








Related examples in the same category

1.'ctrlLeft' Example
2.'ctrlKey' Example
3.'shiftKey' Example
4.'shiftLeft' Example
5.'keyCode' Example
6.Catches and manages the keyboard's events
7.Key and Character Codes vs. Event Types
8.Shift key pressed?
9.Unicode of the key pressed
10.Keyboard Event Handler Laboratory
11.Displaying keyCode Property Values
12.Displaying charCode and keyCode Property Values
13.Checking Events for Modifier Keys
14. Checking Events for Key and Mouse Button Pressed
15.Get key code in key down event (IE)
16.Press F1 to trigger the help event