捕获JavaScript错误WebView Xamarin表单IOS
[英]Catch JavaScript errors WebView Xamarin forms IOS
问题描述
I have a WebView control in my Xamarin form that points to a URL. 
我在Xamarin表单中有一个WebView控件，它指向一个URL。 I am looking for a way to see any unhandled JavaScript errors (things like we see in console of desktop browser) as part of response. 我正在寻找一种方法来查看任何未处理的JavaScript错误（例如我们在桌面浏览器控制台中看到的内容）作为响应的一部分。 please advise? 请指教？
1 个解决方案
解决方案1
0 2019-09-11 01:48:51
Have a try with Invoking JavaScript in Forms as follow : 尝试使用“在表单中调用JavaScript ”，如下所示：
WebView includes the ability to invoke a JavaScript function from C#, and return any result to the calling C# code. WebView包括从C＃调用JavaScript函数并将任何结果返回到调用C＃代码的功能。 This is accomplished with the WebView.EvaluateJavaScriptAsync method, which is shown in the following example from the WebView sample: 这是通过WebView.EvaluateJavaScriptAsync方法完成的，该示例在WebView示例的以下示例中显示：
var numberEntry = new Entry { Text = "5" };
var resultLabel = new Label();
var webView = new WebView();
...
int number = int.Parse(numberEntry.Text);
string result = await webView.EvaluateJavaScriptAsync($"factorial({number})");
resultLabel.Text = $"Factorial of {number} is {result}.";
The WebView.EvaluateJavaScriptAsync method evaluates the JavaScript that's specified as the argument, and returns any result as a string. WebView.EvaluateJavaScriptAsync方法评估指定为参数的JavaScript，并以字符串形式返回任何结果。 In this example, the factorial JavaScript function is invoked, which returns the factorial of number as a result. 在此示例中，调用了阶乘JavaScript函数，该函数返回数字的阶乘。 This JavaScript function is defined in the local HTML file that the WebView loads, and is shown in the following example: 此JavaScript函数在WebView加载的本地HTML文件中定义，并在以下示例中显示：
<html>
<body>
<script type="text/javascript">
function factorial(num) {
if (num === 0 || num === 1)
return 1;
for (var i = num - 1; i >= 1; i--) {
num *= i;
}
return num;
}
</script>
</body>
</html>
Then if want to get errors from JavaScript , also can use this way . 然后如果要从JavaScript中获取错误，也可以使用这种方式。
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