[SharePoint Online, SPO] SP.UI.ModalDialog.showModalDialog(options)

Hi,

It's a wired question. I used a project template "Provider Hosted - App For SharePoint" to create a customization App for SharePoint Online. and I add some javascript to increase the value of the function like open a new window. so I use the following javascript code, and call it from the C# code behind.

function sharePointReady() {
    //Using a generic object.
    var options = {
        title: "My Dialog Title",
        width: 400,
        height: 600,
        url: "/_layouts/DialogPage.aspx"
    };
    SP.UI.ModalDialog.showModalDialog(options);
}

and then I got the error message as below and it is funny not to find out the "showmodaldialog" method, just found out the "showpopupdialog" when I use debugging mode. after that, I use the vs .net to find out the "showpopupdialog" but cannot find it out just find "showmodaldialog" out. If I run it, nothing happened. ... so how should I solve it.

the following screen shot: cannot find the "showmodaldialog" out, just find the"showpopupdialog"

Image may be NSFW.
Clik here to view.

the following screen shot: cannot find the "showpopupdialog" out, just find the "showmodaldialog"

Image may be NSFW.
Clik here to view.

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