android二维码扫描后停止对手机的instascan提醒

Question

我有一个使用instascan扫描二维码的应用程序，但每次你在android手机上扫描二维码时，都会弹出一个带有解码结果的警报。例如，如果我生成了一个文本为"I like bananas“的二维码，则警报将显示"https://mywebsite.com say I like bananas”。

有什么方法可以阻止显示此警报吗？这不会发生在我的笔记本电脑或平板电脑上，只会发生在我的手机上。这是我的代码，如果你想看的话：

    <video id="preview" visible="true"></video>
    <script type="text/javascript">
        let scanner = new Instascan.Scanner({ video: document.getElementById('preview') });
        //When a QR code is detected
        scanner.addListener('scan', function (content) {
            //If it is a url
            if (content.match(/^http?:\/\//i)) {
                //Redirect to new page
                window.open(content);
            } else {                    
                var options = {};
                options.url = "CameraList.aspx/GetContent";
                options.type = "POST";
                options.data = JSON.stringify({ content });
                options.dataType = "json";
                options.contentType = "application/json";
                options.success = function (result) { };
                options.error = function (err) { };

                $.ajax(options);
            }
        });
    </script>

任何帮助都是非常感谢的。

Answer 1

我根据这篇文章找到了答案：Stop alert javascript popup in webbrowser c# control

我想从一个名为GetContent的方法中返回一个字符串，并仅在该字符串不为空时向用户发出警告：

        //write a new function for alert that expects a boolean value
        var fnAlert = alert;
        alert = function (message, doshow) {
        //only if you pass true show the alert
            if (doshow === true) {
                fnAlert(message);
            }
        }
        let scanner = new Instascan.Scanner({ video: document.getElementById('preview') });
        //When a QR code is detected
        scanner.addListener('scan', function (content) {
            //If it is a url
            if (content.match(/^http?:\/\//i)) {
                //Redirect to new page
                window.open(content);
            } else {                    
                var options = {};
                options.url = "CameraList.aspx/GetContent";
                options.type = "POST";
                options.data = JSON.stringify({ content });
                options.dataType = "json";
                options.contentType = "application/json";
                options.success = function (result) {
                    //If my c# method GetContent returns a value
                    if (result != "") {
                        //then alert the user by passing true
                        alert(result, true);
                    }
                };
                options.error = function (err) { };

                $.ajax(options);
            }
        });