Send backspace key press event to the applet and prevent it from continuing

I am struggling with a Java applet on my webpage that allows users to edit text. Whenever a user tries to modify the text by pressing the backspace button, the browser mistakenly forwards to the previous page. I attempted to filter out the backspace key press using the following code snippet:

var a = function () {
        var event = window.event;
        if (event.keyCode == 8){
            alert('backspace');
            return false;
        }
}
document.onkeydown = a;

While this solution prevents the backspace action from reaching the applet and modifying the text, it also stops the propagation of the event altogether. My question is: How can I successfully pass the event to the applet without further propagation?

Answer №1

After researching, I discovered a solution with the help of the jQuery sendkeys plugin. Due to limitations in our project's use of jQuery, I am now attempting to convert it into plain JavaScript.

Answer №2

if (event.keyCode === 8)
{
   var newKeyEvent = document.createEvent('KeyboardEvent');
   newKeyEvent.initKeyEvent(                                                                                      
                 "keydown",        //  in DOMString typeArgument,                                                           
                  true,             //  in boolean canPropagateArg,                                                        
                  true,             //  in boolean isCancelableArg,                                                       
                  null,             //  in nsIDOMAbstractView viewArgument,  Specifies UIEvent.view. This value may be null.     
                  false,            //  in boolean controlKeyArgument,                                                               
                  false,            //  in boolean alternativeKeyArgument,                                                        
                  false,            //  in boolean shiftKeyArgument,                                                      
                  false,            //  in boolean metaKeyArgument,                                                       
                   8,               //  in unsigned long keyCorrespondentArgument,                                                      
                   0);              //  in unsigned long charCodeParameter); 
   document.getElementById('myjavaapplet').dispatchEvent(newKeyEvent);
}

Answer №3

When the "Backspace" key is pressed, this code creates a new UI event and dispatches it to the specified Java applet element on the page. This allows for simulating a keypress event with the same keyCode as the Backspace key.

Answer №4

// This code snippet is intended for IE8 compatibility, but you can add detection logic to handle other browsers as well.

if (event.keyCode === 8)
{
    var simulatedEvent = document.createEventObject();
    simulatedEvent.keyCode = 8;
    document.getElementById('myjavaapplet').fireEvent('onkeypress',simulatedEvent);
}

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