单击按钮时无法在html中调用JavaScript函数

问题描述：

我正在制作一个Chrome扩展程序，为此，我有一个html文件，一个JavaScript文件(可在新标签页中打开修改后的链接)，清单文件和图标.

I was making a Chrome extension, for which I have an html file, a JavaScript file which opens a modified link in a new tab, the manifest file and the icon.

它可以正常工作，但是现在我希望javascript函数仅在用户单击按钮时才能工作.因此，我在html文件中创建了一个按钮，将js代码放入函数中，并使用onclick调用了该函数.

It works fine but now I want the javascript function to work only when the user clicks a button. So I made a button in the html file, put the js code inside a function and called the function using onclick.

但是由于某种原因，它不起作用.单击该按钮似乎没有任何反应.我尝试重新加载扩展程序.另外，我以一个简单程序的工作示例为例，在该程序中，单击按钮时，使用alert()显示一条简单的"Hello world"消息.

But for some reason, it is not working. On clicking the button nothing seems to happen. I have tried reloading the extension. Also, I took a working example of a simple program in which on clicking the button, a simple "Hello world" message is displayed using alert().

当我直接在chrome中打开html页面时，这很好用，但是当我用我制作的功能替换它时，单击似乎没有任何反应.

This works fine when I open the html page directly in chrome but when I replaced this with the function that I made, nothing seems to happen on clicking.

有人可以找到错误/问题吗?

Can someone please find the bug/problem?

urltry.html文件为:

The urltry.html file is:

<!DOCTYPE html>
<html>
<button onclick="editorial()">View Editorial</button>
<script>
function editorial()
{
chrome.tabs.query({currentWindow: true, active: true}, function(tabs){
    var tab_url=tabs[0].url;
    var new_url=tab_url.slice(11);
    chrome.tabs.create({ url:"http://www.discuss." + new_url});        
});
}
</script>
</html>

答

由于Google Chrome扩展程序中默认的内容安全策略(CSP)，因此不允许以下操作:

Due to the default Content Security Policy (CSP) in Google Chrome extensions, the following is disallowed:

评估和相关功能
内嵌JavaScript

SCP上的Google Chrome扩展文档提供的建议是将代码放置在一个单独的文件，并使用适当的绑定来单击JavaScript中的click事件.见下文.

The suggestion, as provided by Google Chrome Extensions documentation on SCP is to place the code to a separate file and use proper binding to click event from JavaScript. See below.

您的HTML文件:

<!DOCTYPE html>
<html>
<head>
  <script src="editorial.js"></script>
</head>
<body>
  <button id="viewEditorial">View Editorial</button>
</body>
</html>

您的JavaScript文件 editorial.js

Your JavaScript file, editorial.js

function editorial() {
  chrome.tabs.query({currentWindow: true, active: true}, function(tabs){
    var tab_url=tabs[0].url;
    var new_url=tab_url.slice(11);
    chrome.tabs.create({ url:"http://www.discuss." + new_url});        
  });
}

document.addEventListener('DOMContentLoaded', function () {
  var btn = document.getElementById('viewEditorial');
  if (btn) {
    btn.addEventListener('click', editorial);
  }
});

注意:请不要忘记您需要声明"tabs"权限才能修改URL.请参见标签文档.

Note: don't forget that you need to declare "tabs" permission to be able to modify the URL. See the tabs documentation.

单击按钮时无法在html中调用JavaScript函数

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