Especially Alert and Confirm Dialog designed for Mobiles/Tablets replacing window.alert and window.confirm.

It’s a best practice to use the new Syntax for Online/On premise as well.

Alert Dialog: Displays a dialog box like alert.

Syntax:

Xrm.Utility.alertDialog(message,onCloseCallback)

Parameter Name	Type	Description
message	String	The text of the message to display in the dialog.
onCloseCallback	Function	A function to execute when the OK button or Close button clicked.Use null if you don’t want callback.

Example: Set Personal Notes field with some text in Contact Entity Onload after Alert Click on Ok or Cancel/Close

Solution: Copy and paste the below Code in Contact Entity and call showAlertDialog on onLoad

function showAlertDialog() {
    Xrm.Utility.alertDialog("Click Ok or Cancel to set the Personal Notes Value", function() {
        Xrm.Page.getAttribute("description").setValue("alertDialog Fired");
    });
}

Output:

After Click on Ok or Cancel,

Confirm Dialog: Displays a confirmation dialog box that contains an optional message as well as OK and Cancel buttons.

Syntax: 

Xrm.Utility.confirmDialog(message,yesCloseCallback,noCloseCallback)

Parameter Name	Type	Description
message	String	The text of the message to display in the dialog.
yesCloseCallback	Function	A function to execute when the OK button is clicked.Use null if you don’t want callback.
noCloseCallback	Function	A function to execute when the Cancel button is clicked.Use null if you don’t want callback.

Example: Set Personal Notes field with some text in Contact entity Onload after Confirm Click on Ok or Cancel/Close

Solution: Copy and paste the below Code in Contact Entity and call showConfirmDialog on onLoad

function showConfirmDialog() {
    Xrm.Utility.confirmDialog("Click Yes or No to set the Personal Notes Value",
        function() {
            Xrm.Page.getAttribute("description").setValue("Yes Callback fired");
        },
        function() {
            Xrm.Page.getAttribute("description").setValue("No Callback fired");
        });
}

Output:

Click on Ok to see the below result,

Click on Cancel or Close to see the below result,

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