javascript 将按下退格键事件传递给小程序并停止其传播

db2dz4w8 于 2023-01-01 发布在 Java

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我在网页上有一个Java小程序，允许编辑文本。当用户试图修改文本，按退格键，浏览器前进到上一页。如果过滤器退格键按如下：

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

那么退格键不会传播到applet，因此不会修改文本。问题是如何将事件传递到applet并停止进一步传播？

JavaScript

来源：https://stackoverflow.com/questions/1565264/pass-backspace-key-pressed-event-to-the-applet-and-stop-it-propagation

4条答案

按热度按时间

cunj1qz11#

现在我找到了使用jQuery sendkeys plugin的解决方案，因为在我们的项目中使用jQuery不是一个选项，我将尝试用普通的javascript重写它。

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fsi0uk1n2#

if (event.keyCode === 8)
{
   var newEvent = document.createEvent('KeyboardEvent');
   newEvent.initKeyEvent(                                                                                      
                 "keypress",        //  in DOMString typeArg,                                                           
                  true,             //  in boolean canBubbleArg,                                                        
                  true,             //  in boolean cancelableArg,                                                       
                  null,             //  in nsIDOMAbstractView viewArg,  Specifies UIEvent.view. This value may be null.     
                  false,            //  in boolean ctrlKeyArg,                                                               
                  false,            //  in boolean altKeyArg,                                                        
                  false,            //  in boolean shiftKeyArg,                                                      
                  false,            //  in boolean metaKeyArg,                                                       
                   8,               //  in unsigned long keyCodeArg,                                                      
                   0);              //  in unsigned long charCodeArg); 
   document.getElementById('myjavaapplet').dispatchEvent(newEvent);
}

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ttvkxqim3#

if (event.keyCode === 8)
{
    var newEvent = document.createEvent('UIEvents');
    newEvent.initUIEvent( 'keypress', true, true, window, 1 );
    newEvent.keyCode = 8;
    document.getElementById('myjavaapplet').dispatchEvent(newEvent);
}

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bihw5rsg4#

// assumes IE8, but you could write detection code based on if (document.createEventObject)

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

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javascript 将按下退格键事件传递给小程序并停止其传播

4条答案

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