How to use showModalDialog in JS modal dialogs.

showModalDialog is a JavaScript function used to create a modal dialog box. A modal dialog box refers to a dialog box where the user must complete some actions before returning to the original page. Here is how to use showModalDialog:

1. Open a modal dialog using showModalDialog.

var returnValue = showModalDialog(url, [options]);

1. URL: The URL to be loaded in the modal dialog box.
2. An optional string that includes some configuration options for the dialog, such as window size and title.

1. Retrieve the parameters passed to a modal dialog box using dialogArguments.

var args = dialogArguments;

1. Set the return value and close the dialog box using returnValue in the modal dialog.

window.returnValue = value;
window.close();

1. Use the returnValue to retrieve the value returned by the modal dialog in the page where it is opened.

var returnedValue = window.showModalDialog(url, [options]);

1. The value returned by the dialogue box.

It is worth noting that the showModalDialog function has been deprecated in modern browsers, and it is recommended to use more flexible methods, such as using pop-up windows, modal windows, or dialog box components to achieve similar functionality.