JavaScript + Chrome Tabs Api - 无法获取标签的URL [英] JavaScript + Chrome Tabs Api - can't get tab's URL

问题描述

我有以下一段代码，问题在于chrome.tabs.getSelected的回调是在用空url发送的请求之后进行评估的。如何解决这个问题？

I have the following piece of code and the problem is that the callback from chrome.tabs.getSelected is evaluated after the request which is send with empty url. How can I solve this?

function send() {
var url = '';
chrome.tabs.getSelected(null, function(tab) {
    url = tab.url;
});

var client = new XMLHttpRequest();
client.onreadystatechange = function() {
    if(this.readyState == 4) {
        alert(this.status);
    }
}
client.open("POST", "http://myurl");
client.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");

client.send(url);
}

推荐答案

欢迎使用Asynchronous Programming p>

Welcome to Asynchronous Programming

function send() {
    chrome.tabs.getSelected(null, function(tab) {
        var client = new XMLHttpRequest();
        client.onreadystatechange = function() {
            if(this.readyState == 4) {
                alert(this.status);
            }
        }
        client.open("POST", "http://myurl");
        client.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");

        client.send(tab.url);
    });
}

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