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?
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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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