如何在Chrome应用中加入jQuery？ [英] How to include jQuery in Chrome app?

问题描述

我需要在Chrome应用中访问一些jQuery方法，但我不确定如何包含API。我是前端开发的新手，我基本上正在寻找某种 .h #include 与我通常用更多类C语言做的平行。

I need access to some jQuery methods in my Chrome app, but am unsure how to include the API. I'm new to front-end development and am basically looking for some kind of .h #include parallel to what I normally do with more C-like languages.

在我的manifest.json中，我尝试添加一个下载版本的jQuery的路径：

In my manifest.json, I tried adding a path to a downloaded version of jQuery:

{
  "name": "my first app",
  "manifest_version": 2,
  "version": "0.0.1",
  "minimum_chrome_version": "36.0.1941.0",
  "app": {
    "background": {
      "scripts": [ "./assets/js/main.js",  "./assets/third-party/js/jquery-2.1.1.js"]
    }
  }
}

在我的main.js文件中：

In my main.js file:

chrome.app.runtime.onLaunched.addListener(function() {
  chrome.app.window.create(
    "index.html",
    {
      innerBounds: {width: 800, height: 510, minWidth: 800}
    });
});

在我的index.js中，我没有任何width（）方法的可见性：

In my index.js, I don't have visibility to any width() method:

(function() {
  var ui = {
    update: null,
  };

  var initializeWindow = function() {
    console.log("Initializing window...");
    for (var k in ui) {
      var id = k.replace(/([A-Z])/, '-$1').toLowerCase();
      var element = document.getElementById(id);
      if (!element) {
        throw "Missing UI element: " + k;
      }
      ui[k] = element;
    }
    ui.update.addEventListener('click', onUpdateClicked);
    console.log("done initializing window");
  };

  var onUpdateClicked = function() {
    console.log("update button was clicked");
    updateProgressBar(0.25);
  };

  var updateProgressBar = function(percent) {
    var elem = document.getElementById("progressbar");
    console.log("Updating progress bar...");
    var progress_width = percent * elem.width() / 100;
    elem.find('div').animate({ width: progress_width }, 500).html(percent + "% ");
  };

  window.addEventListener('load', initializeWindow);
}());

jQuery width（）方法文档

推荐答案

清单中定义的脚本仅适用于后台事件页面（你可能根本不需要jQuery。

Scripts defined in the manifest only apply to background event page (where you probably don't need jQuery at all).

要在 index.html 中使用jQuery，你应该在< script> 标记中引用它的本地副本。小心按正确的顺序包含它。

To use jQuery in index.html, you should reference a local copy of it in a <script> tag. Be careful to include it in the right order.

这就是说，你的代码存在问题。

你混合了DOM元素和jQuery元素。

That said, there's a problem with your code.
You are mixing up DOM elements and jQuery "elements".

var elem = document.getElementById("progressbar");

返回一个DOM元素。您可以使用 $（elem）将其转换为jQuery元素，或者以jQuery方式查询：

returns a DOM element. You can convert it to a jQuery element with $(elem), or query the jQuery way instead:

var elem = $("#progressbar");

一旦你这样做，你就可以访问jQuery方法了。

Once you do that, you'll have access to jQuery methods.

PS我将elements放在引号中，因为jQuery方法会操纵匹配元素集。在这种情况下，单个元素与id查询匹配。

P.S. I put "elements" in quotation marks because jQuery methods manipulate "sets of matched elements" instead. In this case, a single element matches an id query.

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