iOS WKWebView未显示javascript警报()对话框

sc4hvdpw 于 2022-12-05 发布在 iOS

关注(0)|答案(7)|浏览(137)

我在iOS8中的WKWebView显示一个从Javascript调用的提醒对话框时遇到了一些麻烦。在创建了一个标准的WKWebView并加载了一个HTML文件后，我在页面上有一个按钮，它可以创建一个带有一些文本的简单提醒。这个按钮在UIWebView和Google Chrome/Safari中有效，但在WKWebView中似乎不起作用。感谢任何帮助。
我的设置如下：

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.allowsInlineMediaPlayback = YES;
config.mediaPlaybackRequiresUserAction = false;
_wkViewWeb = [[WKWebView alloc] initWithFrame:_viewWeb.frame config];
_wkViewWeb.scrollView.scrollEnabled = NO;
NSString *fullURL = @"file://.../TestSlide.html";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];

[_wkViewWeb loadRequest:request];

html具有以下功能：

<SCRIPT Language="JavaScript">
function alertTest() {
    alert("Testing Alerts");
}
</SCRIPT>

还有一个按钮：

<b>Test Alerts: <input type="button" value="Alert Popup" onclick="alertTest()"><br></b> <br>

此设置在UIWebView和常规浏览器中有效，但在WKWebView中无效。我是否遗漏了配置中的某些内容？我是否应该使用WK委托来控制警报/确认对话框行为？谢谢。

ios

来源：https://stackoverflow.com/questions/26898941/ios-wkwebview-not-showing-javascript-alert-dialog

7条答案

按热度按时间

vlf7wbxs1#

以下是Swift 4.2中的代码

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
             initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: message, message: nil,
                                            preferredStyle: UIAlertController.Style.alert);

    alertController.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.cancel) {
        _ in completionHandler()}
    );

    self.present(alertController, animated: true, completion: {});
}

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qyswt5oh2#

1.视图控制器

ViewController: UIViewController, WKUIDelegate, WKNavigationDelegate

1.启用JavaScript

webView.configuration.preferences.javaScriptEnabled = true

1.在ViewDidLoad（）函数中添加以下项

webView.uiDelegate = self
   webView.navigationDelegate = self
   view.addSubview(webView)

1.按如下方式添加委托

func webView(_ webView: WKWebView,
                 runJavaScriptAlertPanelWithMessage message: String,
                 initiatedByFrame frame: WKFrameInfo,
                 completionHandler: @escaping () -> Void) {
        
        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
        let title = NSLocalizedString("OK", comment: "OK Button")
        let ok = UIAlertAction(title: title, style: .default) { (action: UIAlertAction) -> Void in
            alert.dismiss(animated: true, completion: nil)
        }
        alert.addAction(ok)
        present(alert, animated: true)
        completionHandler()
    }

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vhipe2zx3#

要解决这个问题，您需要一个WKUID代理来显示您的网页视图。代理的职责是决定是否显示警告，以及以什么方式显示。您需要实现警告，确认和文本输入（提示）。
以下是没有验证页面url或安全特性的示例代码：

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"OK"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    [self presentViewController:alertController animated:YES completion:^{}];
}

官方文档中的更多内容

赞(0）回复(0）举报 2022-12-05

1szpjjfi4#

Swift 3实现了所有3个可选功能：

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler()
    }))

    present(alertController, animated: true, completion: nil)
}

func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (Bool) -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler(true)
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(false)
    }))

    present(alertController, animated: true, completion: nil)
}

func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (String?) -> Void) {

    let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)

    alertController.addTextField { (textField) in
        textField.text = defaultText
    }

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        if let text = alertController.textFields?.first?.text {
            completionHandler(text)
        } else {
            completionHandler(defaultText)
        }
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(nil)
    }))

    present(alertController, animated: true, completion: nil)
}

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7y4bm7vi5#

Just to expand a bit, WKWebView requires you to show alerts, prompts, and confirms yourself. Do this by becoming a WKUIDelegate :

#import <WebKit/WebKit.h>
@interface MyController : UIViewController<WKUIDelegate>

Then assign the delegate:

web.UIDelegate = self;

Then you need to actually implement alert, prompt, and confirm. I create WKWebViewPanelManager.h/m as an easy implementation, so here's what I do:

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    [WKWebViewPanelManager presentAlertOnController:self.view.window.rootViewController title:@"Alert" message:message handler:completionHandler];
}

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {
    [WKWebViewPanelManager presentConfirmOnController:self.view.window.rootViewController title:@"Confirm" message:message handler:completionHandler];
}

- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {
    [WKWebViewPanelManager presentPromptOnController:self.view.window.rootViewController title:@"Prompt" message:prompt defaultText:defaultText handler:completionHandler];
}

Of course, it's up to you to filter out bad alert/confirm/prompt requests.

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41zrol4v6#

下面是swift中的内容：

func webView(webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
             initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: message,
                                            message: nil,
                                            preferredStyle: .alert)

    alertController.addAction(UIAlertAction(title: "OK", style: .cancel) {
        _ in completionHandler()}
    )

    self.present(alertController, animated: true, completion: nil)
}

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dzjeubhm7#

1.将协议实现到WKWebview容器控制器。WKUID委派
1.将首选项添加到WKWebview，以便在**viewDidLoad（）**中启用javascript作为。

// enable JS
webView.configuration.preferences.javaScriptEnabled = true

1.将viewDidLoad（）中的WKWebviewUI委托注册为

self.webView.uiDelegate = self

1.在您的类别中实作下列委派。

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: 
String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> 
Void) {
let alertController = UIAlertController(title: message,message: nil,preferredStyle: 
.alert)

alertController.addAction(UIAlertAction(title: "OK", style: .cancel) {_ in 
completionHandler()})

self.present(alertController, animated: true, completion: nil)
}

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iOS WKWebView未显示javascript警报()对话框

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