量角器：我应该如何从browser.executeAsync内部传播错误？ [英] Protractor: How should I propagate an error from within browser.executeAsync?

问题描述

如果根据量角器规范，我在browser.executeAsyncScript中执行了脚本，我该如何传达该脚本确实失败了？考虑以下对browser.executeAsyncScript的调用：

If from a Protractor spec, I execute a script within browser.executeAsyncScript, how should I communicate that the script has indeed failed? Consider the following call to browser.executeAsyncScript:

browser.executeAsyncScript((callback) ->
  # How do I communicate an error condition here!?
  callback()
)
.then((data) ->
  console.log("Browser async finished without errors: #{data}")
, (data) ->
  console.log("Browser async finished with errors: #{data}")
)

我想发生的是调用了错误回调。我该怎么做？

What I want to happen is that the error callback to then is invoked. How do I do this?

推荐答案

来自 webdriverjs文件：

driver.executeAsyncScript(function() {
  var callback = arguments[arguments.length - 1];
  var xhr = new XMLHttpRequest();
  xhr.open("GET", "/resource/data.json", true);
  xhr.onreadystatechange = function() {
    if (xhr.readyState == 4) {
      callback(xhr.responseText);
    }
  }
  xhr.send('');
}).then(function(str) {
  console.log(JSON.parse(str)['food']);
});

因此，它似乎没有错误回调，但是您可以将一些参数传递给回调方法。您可以使用它来传播错误。

So, it does not seem to have an error callback, but you can pass some arguments to the callback method. You can use it to propagate errors.

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