ASPxHint Class

A hint control.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v20.2.dll


public class ASPxHint :


The ASPxHint control allows you to display a hint message for a UI element on a web page. A hint is displayed within a box with an arrow targeting the specified UI element in response to user interaction.


Create a Hint Control

Design Time

The ASPxHint control is available on the DX.20.2: Navigation & Layout toolbox tab in the Microsoft Visual Studio IDE.

Drag the control onto a form and customize the control's settings, or paste the control markup in the page's source code.


To properly function, DevExpress controls require that special modules, handlers and options are registered in the the Web.config file. Switch the Microsoft Visual Studio IDE to the Design tab to automatically update the Web.config file with the required DevExpress information.

<dx:ASPxHint ID="ASPxHint1" runat="server" TargetSelector=".left" Position="left" Content="Sample Text" />

Run Time

<div class="country" style="width: 50px">
    <asp:Button ID="Button1" runat="server" Text="Button" />
using DevExpress.Web;

protected void Page_Load(object sender, EventArgs e)
    ASPxHint hint = new ASPxHint();
    hint.ID = "ASPxHint1";
    hint.TargetSelector = ".country";
    hint.Position = HintPosition.Top;
    hint.Content = "Sample Text";

Client-Side API

The ASPxHint's client-side API is implemented with JavaScript language and exposed by the ASPxClientHint object.


Available by default.

Client object type


Access name




<dx:ASPxHint ID="ASPxHint1" runat="server"></dx:ASPxHint>
ASPxClientHint.Register('[data-visibleindex]', {
    onShowing: function(s, e) {
        var index = getElementAttr(e.targetElement);
        var key = Grid.GetRowKey(index);
        Grid.GetRowValues(index, 'Notes', function(content) {
            e.contentElement.innerHTML = '<div class="hintContent">' +
              '<img src="LoadContentOnDemand.aspx?photo=' + key + '" />' +
              '<div>' + content + '</div>' + '</div>';
        return 'loading...';
        position: 'left',
        triggerAction: 'click',
        className: 'paddings'
    function getElementAttr(element) {
        return element.dataset ? element.dataset['visibleindex'] : element.getAttribute('data-visibleindex');

Customizable Content

You can specify custom content for a hint either on the server or client side programmatically.

<dx:ASPxHint ID="ASPxHint1" Selector=".myImage" Title="My Title"  Content="My Content" runat="server"></dx:ASPxHint>

Learn more

Hint Position

The hint can be displayed on any side (left, right, top, bottom) of the target element.

<dx:ASPxHint ID="ASPxHint1" runat="server" TargetSelector=".left" Position="left" Content="Sample Text" />

Learn more

Trigger Action

The hint allows you to specify which action triggers a hint (hover, click, focus, programmatic).

<dx:ASPxHint ID="ASPxHint1" TargetSelector=".myImage" TriggerAction="HoverAndFocus" runat="server"></dx:ASPxHint>        
<dx:ASPxImage ID="ASPxImage1" ImageUrl="~/Content/myImage.png" CssClass="myImage" runat="server"></dx:ASPxImage>

Learn more

Concept and Getting Started

Hint Control - Overview

Online Demos

See Also