Chrome扩展程序API:将背景页上的chrome.tabs.captureVisibleTab添加到内容脚本 [英] Chrome Extension API: chrome.tabs.captureVisibleTab on Background Page to Content Script
问题描述
我的总体目标是通过后台页面使用以下截图:
http://developer.chrome.com/extensions/tabs.html#method-captureVisibleTab
并将它传递给内容脚本,这样我就可以使用该页面的HTML DOM来分析屏幕截图并以我想要的方式剪切它。
然而,我可以' t似乎通过Message Passing将dataUrl传递回内容脚本:
http://developer.chrome.com/extensions/messaging.html
我试过JSON.stringify(),但是
这很好:
background.js
chrome.runtime.onMessage.addListener(
函数(request,sender,sendResponse){
sendResponse({imgSrc:'hello'});
}
);
我将代码切换到此状态,没有任何东西可以通过:
background.js
chrome.runtime.onMessage.addListener(
函数(request,sender,sendResponse){
chrome.tabs.captureVisibleTab(
null,
{},
function(dataUrl)
{
sendResponse({imgSrc:dataUrl});
}
)
}
);
我唯一可以证明背景页面实际上是截图的是我可以做的
chrome.tabs.captureVisibleTab(null,{},function(dataUrl){console.log(dataUrl);});
我看到
data: image / jpeg; base64,/ 9j / 4AAQSkZJRgABAQAAA ....等等......
记录在background.html中,这是有效的
我的问题是:如何将此网址发送到内容脚本? 我不希望在背景页面上执行所有逻辑,这些逻辑无法控制实际可见页面上的任何内容。 使用chrome.tabs。
sendMessage
后台页面:
chrome.runtime.onMessage.addListener (
函数(request,sender,sendResponse){
chrome.tabs.captureVisibleTab(
null,
{},
函数(dataUrl)
{
sendResponse({imgSrc:dataUrl});
}
); //记住captureVisibleTab()是一个语句
返回true;
}
);
内容脚本
chrome.runtime.sendMessage({msg:capture},function(response){
console.log(response.dataUrl);
});
My overall goal was to take a screenshot via the background page using:
http://developer.chrome.com/extensions/tabs.html#method-captureVisibleTab
and pass it to the content script so I can use the page's HTML DOM to analyze the screenshot and cut it up the way I would like.
However, I can't seem to pass the dataUrl back to the content script with Message Passing:
http://developer.chrome.com/extensions/messaging.html
I tried JSON.stringify() but to no avail.
This works perfectly fine:
background.js
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
sendResponse({imgSrc:'hello'});
}
);
I switch the code to this and nothing gets through:
background.js
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
chrome.tabs.captureVisibleTab(
null,
{},
function(dataUrl)
{
sendResponse({imgSrc:dataUrl});
}
)
}
);
My only proof that the background page is actually taking a screenshot is that I can do
chrome.tabs.captureVisibleTab(null,{},function(dataUrl){console.log(dataUrl);});
and I see
"data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAA....etc..."
logged in background.html, which is valid
My question is: How can I send this URL to the content script?
I would prefer not to do all the logic on the background page which can't control anything on the actual visible page.
Use chrome.tabs.sendMessage
background page:
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
chrome.tabs.captureVisibleTab(
null,
{},
function(dataUrl)
{
sendResponse({imgSrc:dataUrl});
}
); //remember that captureVisibleTab() is a statement
return true;
}
);
content script
chrome.runtime.sendMessage({msg: "capture"}, function(response) {
console.log(response.dataUrl);
});
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