Chrome扩展程序-动态右键菜单

问题描述：

我试图在右键单击菜单中创建一个根据用户操作动态变化的选项.如果用户选择了一些文本，然后单击鼠标右键，该选项将显示为显示".如果用户单击鼠标右键而不选择某些文本，则该选项将显示首先选择某些文本"并显示为灰色.我想知道如何实现这一目标?

I am trying to create an option in the right-click menu that is dynamic based on the user's action. If the user selects some text, then right-clicks, the option will say "Display It". If the user right-clicks without selecting some text, the option will say "Select Some Text First" and be grayed out. I am wondering how do I achieve this?

我当前拥有它，因此该选项仅在用户选择了某些文本时才会显示.我不确定如何修改它以满足我的第二个要求.

I currently have it so that the option will appear only when the user has selected some text. I am unsure how to modify it to meet my second requirements.

chrome.contextMenus.create ({
    title:"Display It!", contexts:["selection"], onclick:function(info,tab) {
        chrome.tabs.sendRequest(
            tab.id,
            {callFunction: "displaySidebar", info: info}, 
            function(response) {console.log(response);}
        );
    }           
});

答

您无法将某项显示为灰色... Chrome付出了一些努力，仅在相关菜单项出现时才显示它，这就是为什么我想没有灰显选项.您的方式与Chrome尝试实施的方式背道而驰，我认为您真的应该重新考虑您的实现方式.
话虽如此，您可以使用chrome.contextMenus.update更改菜单项.
下列代码与按自己的方式行事一样好(认真地重新思考这个想法)....

You cant grey an item out...Chrome has gone to a bit of effort to only make context menu items appear when its relevant which is why i guess theres no grey out option. Your way goes against what Chrome have tried to implement and I think you really should rethink the way you go about this.
Saying that, you can use the chrome.contextMenus.update to change a menu item.
The following code is about as good as your going to get it your way (seriously, rethink this idea)....

function selectedTrueOnClick(info, tab) {
    chrome.tabs.sendRequest(
    tab.id, {
        callFunction: "displaySidebar",
        info: info
    }, function(response) {
        console.log(response);
    });
}

function selectedFalseOnClick(info, tab) {
    //
}

var contextMenuID = chrome.contextMenus.create({
    title: "Select some text",
    contexts: ["all"],
    onclick: selectedFalseOnClick
});

function contextMenuUpdate(selected) {
    if (selected) chrome.contextMenus.update(contextMenuID, {
        title: 'You selected "%s"',
        contexts: ["all"],
        onclick: selectedTrueOnClick
    });
    else chrome.contextMenus.update(contextMenuID, {
        title: "Select some text",
        contexts: ["all"],
        onclick: selectedTrueOnClick
    });
}

contextMenuUpdate(false);

Chrome扩展程序-动态右键菜单

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