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[英]JavaScript Chrome extension- Send Message after create new Tab from popup to content
[英]google chrome extension- unable to pass message from content script to popup page in same extension
我正在使用以下代码从内容脚本发送示例消息:
function sendjsontrue()
{
var arrCars = new Array("Toyota", "Mercedes", "BMW");
jsonStr = JSON.stringify(arrCars);
chrome.extension.sendRequest({greeting: jsonStr}, function(response){
console.log(response.farewell);
});
console.log("Message with header=greeting has been sent...");
}
我的popup.html中用于处理内容脚本发送的消息的代码如下:
<script>
chrome.extension.onRequest.addListener(
function(request, sender, sendResponse) {
console.log(sender.tab ?
"from a content script:" + sender.tab.url :
"from the extension");
if (request.greeting == "hello")
sendResponse({farewell: "goodbye"});
else
sendResponse({notfarewell:"Not goodbye"}); .
});
</script>
我得到的错误如下:
Port error: Could not establish connection. Receiving end does not exist.
chrome/EventBindings:184Error in event handler for 'undefined': TypeError: Cannot read property 'farewell' of undefined
at chrome-extension://nkmkgjckmjekpbghhildcfdlnbjeglkd/obtainformdata.js:81:25
at chrome/RendererExtensionBindings:238:13
at [object Object].dispatch (chrome/EventBindings:182:28)
at Object.<anonymous> (chrome/RendererExtensionBindings:134:27)
我在这里做错了什么?
我在听来自option.html的请求时遇到了同样的问题。 我发现以下解决方案:
您也可以在弹出页面中编写接收器代码,但限制是只有当popup.html处于活动状态时, chrome.extension.onRequest.addListener()才会侦听您的请求。 因此,如果您想一直收听请求,则必须编写
chrome.extension.onRequest.addListener()
在后台页面中,然后将此页面注册到manifest.json 。
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