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chrome app开发学习笔记1

2013-12-26 12:20 323 查看

昨天照着教程试着写第一个chrome app，下面记录和分享下一些小收获。（教程会在下面附注出来）
自学的时候，最让人不爽的是，照着教程一步一步来，结果却与教程差距甚大，还找不到原因。。。
一个简单的chrome app的demo的教程我在重复它的过程时遇到两个问题。
首先就是manifest.json的问题，给出的代码是：

{
"name": "My First Extension",
"version": "1.0",
"description": "The first extension that I made.",
"browser_action": {
"default_icon": "icon.png",
"popup": "popup.html"
},
"permissions": [
"http://api.flickr.com/"
]
}

我们需要修改下，才能让我们的app正确的运行：

{
"name": "My First Extension",
"version": "1.0",
"manifest_version": 2,//必须添加
"description": "The first extension that I made.",

"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"//更改成default_popup
},

"permissions": [
"http://api.flickr.com/"
]
}

第二个，就是添加popup.html，同时也需要添加popup.js，popup.html代码如下：

<!doctype html>
<html>
<head>
<title>Getting Started Extension's Popup</title>
<style>
body {
min-width: 357px;
overflow-x: hidden;
}

img {
margin: 5px;
border: 2px solid black;
vertical-align: middle;
width: 75px;
height: 75px;
}
</style>

<!--
- JavaScript and HTML must be in separate files: see our Content Security
- Policy documentation[1] for details and explanation.
-
- [1]: http://developer.chrome.com/extensions/contentSecurityPolicy.html -->
<script src="popup.js"></script>
</head>
<body>
</body>
</html>

popup.js代码如下：

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
* Global variable containing the query we'd like to pass to Flickr. In this
* case, kittens!
*
* @type {string}
*/
var QUERY = 'kittens';

var kittenGenerator = {
/**
* Flickr URL that will give us lots and lots of whatever we're looking for.
*
* See http://www.flickr.com/services/api/flickr.photos.search.html for
* details about the construction of this URL.
*
* @type {string}
* @private
*/
searchOnFlickr_: 'https://secure.flickr.com/services/rest/?' +
'method=flickr.photos.search&' +
'api_key=90485e931f687a9b9c2a66bf58a3861a&' +
'text=' + encodeURIComponent(QUERY) + '&' +
'safe_search=1&' +
'content_type=1&' +
'sort=interestingness-desc&' +
'per_page=20',

/**
* Sends an XHR GET request to grab photos of lots and lots of kittens. The
* XHR's 'onload' event is hooks up to the 'showPhotos_' method.
*
* @public
*/
requestKittens: function() {
var req = new XMLHttpRequest();
req.open("GET", this.searchOnFlickr_, true);
req.onload = this.showPhotos_.bind(this);
req.send(null);
},

/**
* Handle the 'onload' event of our kitten XHR request, generated in
* 'requestKittens', by generating 'img' elements, and stuffing them into
* the document for display.
*
* @param {ProgressEvent} e The XHR ProgressEvent.
* @private
*/
showPhotos_: function (e) {
var kittens = e.target.responseXML.querySelectorAll('photo');
for (var i = 0; i < kittens.length; i++) {
var img = document.createElement('img');
img.src = this.constructKittenURL_(kittens[i]);
img.setAttribute('alt', kittens[i].getAttribute('title'));
document.body.appendChild(img);
}
},

/**
* Given a photo, construct a URL using the method outlined at
* http://www.flickr.com/services/api/misc.urlKittenl *
* @param {DOMElement} A kitten.
* @return {string} The kitten's URL.
* @private
*/
constructKittenURL_: function (photo) {
return "http://farm" + photo.getAttribute("farm") +
".static.flickr.com/" + photo.getAttribute("server") +
"/" + photo.getAttribute("id") +
"_" + photo.getAttribute("secret") +
"_s.jpg";
}
};

// Run our kitten generation script as soon as the document's DOM is ready.
document.addEventListener('DOMContentLoaded', function () {
kittenGenerator.requestKittens();
});

结果如下：

chrome app 开发文档

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