扩展出现在浏览器的上下文菜单中

Question

我正在使用kango框架开发跨浏览器扩展。我想将我的扩展名添加到浏览器的上下文菜单中。我已经在extension_info.json文件中的权限数组中设置了“context_menu”：true，但我的扩展名仍未出现在上下文菜单中（当浏览器窗口中有右击时）。我怎样才能做到这一点？

Answer 1

您需要添加一个事件侦听main.js这样的：

kango.ui.contextMenuItem.addEventListener(kango.ui.contextMenuItem.event.CLICK, function()  { 
    kango.browser.tabs.getCurrent(function(tab) { 
    tab.dispatchMessage('ContextMenuItemClick'); 
    }); 
}); 

而在content.js需要消耗这样的事件：

function handleContextMenuClick() { 
var clickedElement = null; 

if ('addEventListener' in document) { 
    document.addEventListener('mousedown', function(event) { 
     if (event.button == 2 && IsSupported()) { 
      clickedElement = event.target;    
      kango.console.log('StopIt menu item click 1'); 
     } 
    }, true); 
} else { 
    document.attachEvent('onmousedown', function(event) { 
     event = event || window.event; 
     if (event.button == 2&& IsSupported()) { 
      clickedElement = event.srcElement; 
      kango.console.log('StopIt menu item click 2'); 
     } 
    }); 
} 

kango.addMessageListener('ContextMenuItemClick', function(event) { 
    kango.console.log("addMessageListener: ContextMenuItemClick added"); 
    }); 
} 

handleContextMenuClick(); 


// Only activate the menu when the user is on facebook or twitter. 
// This should be loaded from a service and updated one each new domain visited. 
function IsSupported() 
    { 
    if(document.domain.indexOf("facebook.") > -1) return true; 
    if(document.domain.indexOf("twitter.") > -1) return true; 

    return false; 
    }