检查analytics.js是否已加载 [英] Check if analytics.js is loaded

问题描述

我必须使用我的服务器提供的本地analytics.js。我只想在必要时使用本地版本 - 那么是否有解决方案来检查analytics.js的调用是否失败？

I have to use a local analytics.js that I serve from my server. I just want to use the local version if necessary - so is there a solution for checking if the call for analytics.js has failed?

我想过用全局window.onerror，但我不认为失败的外部文件调用会导致错误。我尝试检查ga（）是否可用，但即使analytics.js未加载，也是如此。

I thought about checking it with a global window.onerror, but I don't think a failed call for an external file causes an error. I've tried checking if ga() is available, but it is even if analytics.js isn't loaded.

有什么想法？如果您想知道，并非本网站的所有用户都可以访问互联网，那就是我服务本地版本的原因。在这种情况下会发生更多事情，例如添加sendHitTask以将答案从analytics.js重定向到本地服务器。

Any ideas? If you are wondering, not all users of this site has internet access, that's why I'm serving a local version. There is more things happening in this case, like adding a sendHitTask to redirect the answer from analytics.js to the local server.

编辑
您检查用户是否可以上网的解决方案也可以。但我还没有找到任何解决方案，这可以适用于所有现代浏览器。

EDIT A solution where you check if the user has Internet access would also be OK. But I have not found any solution for this either that works on all modern browsers.

推荐答案

有一个函数来跟踪库已加载。从文档 https://developers.google。 com / analytics / devguides / collection / analyticsjs / command-queue-reference＃ready-callback ：

There's a function to track if the library has loaded. From the docs https://developers.google.com/analytics/devguides/collection/analyticsjs/command-queue-reference#ready-callback:

ga(function(tracker) {
   var defaultPage = tracker.get('page');
});

传入函数在加载库时执行，因此您可以设置一个变量来跟踪是否已加载。你必须把它放在某种计时器上，以决定你何时考虑失败：

The passed in function is executed when the library is loaded, so you could set a variable to keep track of whether or not it has loaded. You'd have to put it on some sort of timer to decide when you want to consider it failed:

var loaded = false;
ga(function() {
   loaded = true;
});

// after one second do something if the library hasn't loaded
setTimeout(function(){
    if (!loaded){
        //do something
    }
},1000);

这篇关于检查analytics.js是否已加载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！