How to use the JavaScript window ShowModalDialog feature?

Window.ShowModalDialog is a JavaScript method that displays a new window in a modal dialog box. With a modal dialog box, the user must interact with the content in the dialog box before being able to continue using the original window.

Here is a simple example demonstrating how to use the Window.ShowModalDialog method:

var returnValue = window.showModalDialog('dialog.html', 'dialogArguments', 'dialogHeight=200px; dialogWidth=400px; resizable=no;');

// 处理返回值
alert('用户选择了：' + returnValue);

In this example, we called the Window.ShowModalDialog method and passed in three parameters.

1. URL: The URL of the page to be displayed in the modal dialog.
2. Argument: parameters passed to the modal dialog.
3. Properties of the dialog box, such as height, width, and whether it can be resized.

The page in the modal dialog can return a value using window.returnValue. In the example above, we assigned the value selected by the user in the modal dialog to returnValue and displayed it using the alert method.

It should be noted that the Window.ShowModalDialog method has been deprecated in some modern browsers. It is recommended to use the Window.Open method or other alternative solutions to achieve similar functionality.