在background.html中，如何访问当前网页以获取dom [英] In background.html,how can I access current web page to get dom
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问题描述
例如getElementById（）
解决方案
为此，您需要使用消息传递。需要消息传递以允许您与DOM进行通信，并且唯一的沟通方式是方法1
background.html
<$ c
< script>
chrome.tabs.getSelected（null，function（tab）{
chrome.tabs.sendRequest（tab.id，{method： getHTML}，函数（响应）{
console.log（response.data）;
}）;
}）;
< / script>
< ; / html>
content_script.js
chrome.extension.onRequest.addListener（function（request，sender，sendResponse）{
if（request.method ==getHTML）
sendResponse（{data：document.getElementById（'header'）。innerHTML}）;
else
sendResponse（{}）; //缓解他们。
}）;
方法2
只执行一个内容脚本，只要你需要：
background.html
< HTML>
< script>
chrome.browserAction.onClicked.addListener（function（tab）{
chrome.tabs.executeScript（tab.id，{file：'execute.js'}）;
}）;
chrome.extension.onRequest.addListener（function（request，sender，sendResponse）{
console.log（'Data Recieved：'+ request.data）;
}） ;
< / script>
< / html>
execute.js
chrome.extension.sendRequest（{data：document.getElementById（'header'）。innerHTML}）;
In background.html,I want to get current web page dom. such as "getElementById()
解决方案
To do this, you would need to use Message Passing. Message passing is needed to allow you to communicate to the DOM, and the only way to communicate to the DOM is through Content-Scripts. I will show you two ways which you can do this:
Method 1
Having every visited page listen for an extension request
background.html
<html>
<script>
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendRequest(tab.id, {method: "getHTML"}, function(response) {
console.log(response.data);
});
});
</script>
</html>
content_script.js
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
if (request.method == "getHTML")
sendResponse({data: document.getElementById('header').innerHTML});
else
sendResponse({}); // snub them.
});
Method 2
Only execute a content script whenever you need to:
background.html
<html>
<script>
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(tab.id, {file: 'execute.js'});
});
chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
console.log('Data Recieved: ' + request.data);
});
</script>
</html>
execute.js
chrome.extension.sendRequest({data: document.getElementById('header').innerHTML});
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