Question

我是一个相当陌生的JavaScript，我正在创建一个扩展程序，用于保存用户数据以显示在特定页面上（Google Classroom，具体而言）。我尝试过使用localStorage，但这会将其保存到特定页面的本地存储中。我需要用户能够在Chrome中的中保存和访问数据，我也需要在新会话中使用它。

总之，我需要三个功能。一个用于将用户数据保存到chrome.storage，一个用于从给定键的chrome.storage中获取值，另一个用于列出chrome.storage中的所有键。

的manifest.json

{
  "manifest_version": 2,
  "name": "AssignMe for Classroom",
  "short_name": "AssignMe",
  "description": "Create your own assignments on Google Classroom.",
  "version": "1.0",

  "browser_action": {
   "default_icon": "src/icon128.png",
   "default_popup": "popup.html"
  },

  "icons": {
   "16": "src/icon16.png",
   "19": "src/icon19.png",
   "48": "src/icon48.png",
   "128": "src/icon128.png"
  },

  "content_scripts": [{
   "matches": ["https://classroom.google.com/*/not-turned-in/all"],
   "js": ["displayBackground.js"],
   "run_at": "document_end"
  }],

  "permissions": [
   "activeTab",
   "storage",
   "tabs",
   "<all_urls>"
  ]
}

popup.html

<!DOCTYPE html>
<html>
  <head>
  </head>
  <body>
    <form name="newAssignment" onsubmit="return display()">
      <fieldset>
        <legend><strong>New Assignment</strong></legend>
        <strong>Title</strong>
        <input type="text" id="title" spellcheck="false" name="title">
        <br /><br />
        <strong>Date</strong>
        <input type="date" id="date" spellcheck="false" name="date">
        <br />
        <p id="demo">0</p>
        <button type="button" id="do-count">Create Assignment</button>
        <script src="content.js"></script>
      </fieldset>
    </form>
  </body>
</html>

content.js

var title = document.getElementById("title").value;
var date = document.getElementById("date").value;

// Function that saves user data to chrome.storage
// Function that grabs user data from chrome.storage by key
// Function that grabs all keys from chrome.storage

Answer 1

试试这个。

curAssignment = 0;
// save data (you can use .local or .sync)
function saveData() {
  chrome.storage.local.set({
    Data: {
      ["Assignment" + curAssignment]: {
        Title: title,
        Date: date
      }
    }
  }, function() {console.log("Data Saved");});
  curAssignment = curAssignment + 1;
}

[“Assignment”+ curAssignment]根据已保存的项目数为新项目提供唯一ID。

// load data
loadedAssignment = 0;
function loadData() {
  chrome.storage.local.get(["Data"], function(results) {
    while (loadedAssignment < results.Data.length) {
      loadedTitle = results.Data[loadedAssignment].Title;
      loadedDate = results.Date[loadedAssignment].Date;

      // your code that handles the loaded data

      loadedAssignment = loadedAssignment + 1;
    }
    curAssignment = results.Data.length;
  });
}

loadData函数循环遍历chrome.storage.local中的“Data”项，并获取存储项的Title和Date。

根据StackOverflow，你可以使用

// get all items
function getAllItems() {
  chrome.storage.local.get(null, function(items) {
    var allKeys = Object.keys(items);
  });
}

获取存储中的所有项目。

Answer 2

一种更花哨的方法（设置和获取），它还可以处理错误：

public void triggerReload() throws IOException {
    LOG.info("Reloading configuration");

    try {
        this.contextRefresher.refresh();
    } catch (final BeanCreationException e) {
        // DO SOMETHING USEFUL
    }

    LOG.info(this.jHipsterProperties.getMail().getFrom()); // <--- value is not updated
    LOG.info(this.mailProperties.getHost()); // <--- value is updated
}

chrome.storage for Chrome扩展程序

2 个答案: