回答編集履歴
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見直しキャンペーン中
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[How do you call a JavaScript method that returns a result?](https://github.com/cefsharp/CefSharp/wiki/General-Usage#2-how-do-you-call-a-javascript-method-that-returns-a-result)
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`EvaluateScriptAsync`は`Task<JavascriptResponse>`を返します。
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```
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```cs
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Task<JavascriptResponse> task = browser.EvaluateScriptAsync(script);
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```
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通常は`await`して`JavascriptResponse`を取得すればいいでしょう。
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```
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```cs
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JavascriptResponse response = await browser.EvaluateScriptAsync(script);
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```
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@@ -15,7 +15,7 @@
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制限もあるようですので参考URLの前後もチェックしてください。
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```
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```cs
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using System.Diagnostics;
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using System.Windows;
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using CefSharp;
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元ドキュメント修正済み
test
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[How do you call a JavaScript method that returns a result?](https://github.com/cefsharp/CefSharp/wiki/General-Usage#2-how-do-you-call-a-javascript-method-that-returns-a-result)
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いきなり間違っていますがw
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`EvaluateScriptAsync`は`Task<JavascriptResponse>`を返します。
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```
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Task<JavascriptResponse> task = browser.EvaluateScriptAsync(script);
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```
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通常は`await`して`JavascriptResponse`を取得すればいいでしょう。
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```
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JavascriptResponse response = await browser.EvaluateScriptAsync(script);
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```
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通常は`await`して`JavascriptResponse`を取得すればいいでしょう。
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```
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JavascriptResponse response = await browser.EvaluateScriptAsync(script);
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```
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成功していれば`response.Success`が`true`です。
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戻り値は`response.Result`に`object`で入っています。キャストして使用してください。
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制限もあるようですので参考URLの前後もチェックしてください。
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```C#
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using System.Diagnostics;
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using System.Windows;
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using CefSharp;
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using CefSharp.Wpf;
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namespace Questions244110
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{
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public partial class MainWindow : Window
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{
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private ChromiumWebBrowser chrome;
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public MainWindow()
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{
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InitializeComponent();
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chrome = new ChromiumWebBrowser { Address = "https://teratail.com/tags/WPF/new/1", };
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chrome.LoadingStateChanged += OnLoadingStateChanged;
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Content = chrome;
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}
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private async void OnLoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
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{
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if(!e.IsLoading)
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{
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JavascriptResponse response = await chrome.EvaluateScriptAsync("1+2");
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Debug.WriteLine(response.Result); // 3
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response = await chrome.EvaluateScriptAsync("aaa");
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Debug.WriteLine(response.Success); // False
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Debug.WriteLine(response.Message); // ncaught ReferenceError: aaa is not defined
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string script = @"var bool = false;" +
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"if(document.body.innerHTML.includes('CefSharp')){" +
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"bool = true;" +
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"}" +
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"bool;";
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response = await chrome.EvaluateScriptAsync(script);
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if(response.Success)
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{
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string s = (bool)response.Result ? "ありました" : "ありませんでした";
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Debug.WriteLine($"CefSharpの質問が{s}");
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}
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else
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{
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Debug.WriteLine($"スクリプトエラー！ {response.Message}");
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}
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}
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}
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}
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}
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```
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