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How to make a modal RadNotification

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Article information

Article relates to

 RadNotification for ASP.NET AJAX

Created by

 Marin Bratanov, Telerik

Created on

 7th of October, 2011


HOW-TO:

Make the RadNotification display a modal overlay.

DESCRIPTION:  

The RadNotification is a lightweight control and does not have a built-in modality (i.e. no Modal property).


RadControls for ASP.NET AJAX


SOLUTION:

The modal overlay used in a web page is actually an HTML element that has some specific properties set - absolute positioning, appropriate size, backgroung color, opacity and the unselectable attribute set to on. In this case we need to utilize the RadNotification's client-side events and more precisely the OnClientShowing and OnClientHidden to respectively show and hide the modality div. Below is an example how to create such an element:

if (!modalDiv)
{
    modalDiv = document.createElement("div");
    modalDiv.style.width = "100%";
    modalDiv.style.height = "100%";
    modalDiv.style.backgroundColor = "#aaaaaa";
    modalDiv.style.position = "absolute";
    modalDiv.style.left = "0px";
    modalDiv.style.top = "0px";
    modalDiv.style.filter = "progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=50)";
    modalDiv.style.opacity = ".5";
    modalDiv.style.MozOpacity = ".5";
    modalDiv.setAttribute("unselectable", "on");
    modalDiv.style.zIndex = (sender.get_zIndex() - 1).toString();
    document.body.appendChild(modalDiv);
}

A simple, runnable page that shows the approach in action is attached.

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