为什么chrome.extension.getBackgroundPage（）返回null？ [英] Why does chrome.extension.getBackgroundPage() return null?
问题描述
我有一个 manifest.json 文件，如下所示：
{
name：Zend Debugger Extension，
version：0.1，
background_page：background.html，
permissions：[
cookies，tabs，http：// * / *，https：// * / *
]，
browser_action：{
default_title： 启动Zend Debugger，
default_icon：icon.png，
popup：popup.html
}
}
以下是我的 background.html ：
< HTML>
< script>
函数testRequest（）{
console.log（test Request received）;
}
< / script>
< / html>
而我的 popup.html ：
< script>
function debug（target）{
if（target.id =='thisPage'）{
console.log（'sending request'）;
chrome.extension.getBackgroundPage（）。testRequest（）;
}
}
< / script>
< div onclick =debug（this）id =thisPage>当前页面< / div>
但是， background.html 页似乎无法访问。我得到这个错误：
未捕获的TypeError：无法调用null的方法'testRequest'
当我检查 chrome.extension.getBackgroundPage（）时，我得到一个空值。我想我的清单文件中有一个错误，但我看不到我做错了什么。
谢谢。
您缺少背景权限，请查看我的chrome扩展程序的manifest.json文件：
{
content_scripts：[
{
matches：[http：// * / *]，
js：[jquery.js，asserts.js]
}
]，
name：Test Extension，
version ：1.0，
description：将js注入网页的测试扩展。，
background_page：background.html，
options_page： options.html，
browser_action：{
default_icon：icon.png，
popup：popup.html
}，
权限：[
标签，
http：// * / *，https：// * / *，< all_url>，background
$ b 编辑：
你确定你有表现力ound.html 文件放在同一个文件夹中作为所有你的chrome扩展的文件吗？如果是，请尝试从扩展管理页面重新加载你的扩展，我记得有一个错误，我的扩展没有重新加载，所以我去了我的背景页面的开发工具，并从控制台执行 window.location.reload（true）; ，修复了它。请回复如果这工作，我会继续研究
I have a manifest.json file that looks like this:
{
"name": "Zend Debugger Extension",
"version": "0.1",
"background_page": "background.html",
"permissions": [
"cookies", "tabs", "http://*/*", "https://*/*"
],
"browser_action": {
"default_title": "Launch Zend Debugger",
"default_icon": "icon.png",
"popup": "popup.html"
}
}
Here's my background.html:
<html>
<script>
function testRequest() {
console.log("test Request received");
}
</script>
</html>
And my popup.html:
<script>
function debug(target) {
if (target.id == 'thisPage') {
console.log('sending request');
chrome.extension.getBackgroundPage().testRequest();
}
}
</script>
<div onclick="debug(this)" id="thisPage">Current Page</div>
However, the background.html page doesn't seem to be accessible. I'm getting this error:
Uncaught TypeError: Cannot call method 'testRequest' of null
When I inspect chrome.extension.getBackgroundPage() I get a null value. I'm thinking I have made a mistake in my manifest file, but I can't see what I've done wrong.
Thanks.
解决方案 You are missing the background permission, take a look at my manifest.json file of my chrome extension:
{
"content_scripts": [
{
"matches": ["http://*/*"],
"js": ["jquery.js", "asserts.js"]
}
],
"name": "Test Extension",
"version": "1.0",
"description": "A test extension to inject js to a webpage.",
"background_page": "background.html",
"options_page": "options.html",
"browser_action": {
"default_icon": "icon.png",
"popup": "popup.html"
},
"permissions": [
"tabs",
"http://*/*", "https://*/*", "<all_url>", "background"
]
}
EDIT:
Are you sure you have the background.html file on the same folder as all your chrome-extension's files?, and if so, try reloading your extension from the extension management page, I remember once had a bug that my extension didn't reload, so I went to the developer's tools for my background page and executed window.location.reload(true); from console, that fixed it. Please respond if this worked, I will keep researching
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