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what is trigger in asp net

by Dr. Richard Ondricka Published 3 years ago Updated 3 years ago

Understanding ASP.NET AJAX UpdatePanel Triggers

  • Triggers. Triggers for a given UpdatePanel, by default, automatically include any child controls that invoke a postback, including (for example) TextBox controls that have their AutoPostBack property set to true.
  • The <Triggers> Element. ...
  • <Triggers> Element Reference. ...
  • Walkthrough: Cross-UpdatePanel Triggers. ...
  • Under the Hood. ...

<Triggers> Element Reference
Specifies a control and event that will cause a partial page update for the UpdatePanel that contains this trigger reference. <asp:PostBackTrigger> Specifies a control and event that will cause a full page update (a full page refresh).
Feb 19, 2020

Full Answer

Is it possible to create a custom trigger based on another control?

Triggers that are based on controls in other naming containers are not supported. The workaround is to use the UniqueID of the control that the trigger is referencing. Unfortunately the UniqueID isn't qualified until the control has been added to its parent (and its parent has been added to its parent, all the way up the control tree).

How does the triggers element work?

One of which is the Triggers element, which specifies the controls on the page (or the user control, if you are using one) that will trigger a partial render of the UpdatePanel control in which the element resides.

How do I include triggers in UpdatePanel control?

However, triggers can also be included declaratively using markup; this is done within the <triggers> section of the UpdatePanel control declaration.

How do I register a partial render trigger?

Although triggers can be accessed via the Triggers collection property, it is recommended that you register any partial render triggers at run-time (for instance, if a control is not available at design time) by using the RegisterAsyncPostBackControl (Control) method of the ScriptManager object for your page, within the Page_Load event.

What is the use of postback trigger in asp net?

Hi naren, Use the PostBackTrigger control to enable controls inside an UpdatePanel to cause a postback instead of performing an asynchronous postback.

Why do we use UpdatePanel in asp net?

Introduction. UpdatePanel controls are a central part of AJAX functionality in ASP.NET. They are used with the ScriptManager control to enable partial-page rendering. Partial-page rendering reduces the need for synchronous postbacks and complete page updates when only part of the page has to be updated.

What is difference between AsyncPostBackTrigger and PostBackTrigger?

The AsyncPostBackTrigger “wires” up these controls to trigger an asynchronous post back. Conversely, controls declared inside an update panel will trigger an asynchronous call by default. The PostBackTrigger short circuits this, and forces the control to do a synchronous post back.

What is ScriptManager in asp net?

ScriptManager is a server-side control that sits on your Web Form and enables the core of ASP.NET AJAX. Its primary role is the arbitration of all other ASP.NET AJAX controls on the Web Form and the addition of the right scripting libraries to the Web browser so that the client portion of ASP.NET AJAX can function.

What is timer control in asp net?

The ASP.NET AJAX Timer control performs postbacks at defined intervals. If you use the Timer control with an UpdatePanel control, you can enable partial-page updates at a defined interval. You can also use the Timer control to post the whole page.

Why PostBackTrigger is used in update panel?

Remarks. Use the PostBackTrigger control to enable controls inside an UpdatePanel to cause a postback instead of performing an asynchronous postback. Use the RegisterPostBackControl method of the ScriptManager control to programmatically register a postback control.

Is Async a postback?

The main difference between these 2 trigger are: Asynchronous Postback triggers update the page partially without refreshing the whole page (AJAX). Postback triggers update the complete page caused by complete post of the page to the server.

What is the difference between synchronous postback and asynchronous postback?

The difference between synchronous and asynchronous postback is thatAsynchronous postback renders only the required part of the page and whereas, synchronous postback renders the entire page for any postback.

What is async postback trigger?

Converts postbacks into async callbacks Typically used to trigger updates when controls outside an UpdatePanel post back If ChildrenAsTriggers="false", can be used to specify which controls inside UpdatePanel should call back rather than post back.

What is .NET Viewstate?

View state is the method that the ASP.NET page framework uses to preserve page and control values between round trips. When the HTML markup for the page is rendered, the current state of the page and values that must be retained during postback are serialized into base64-encoded strings.

How do I use ASP UpdateProgress?

Using a Single UpdateProgress ControlCreate a new page and switch to Design view.In the AJAX Extensions tab of the toolbox, double-click the ScriptManager control to add it to the page.Double click the UpdatePanel control to add it to the page.Double-click the UpdateProgress control to add it to the page.More items...•

Where do I put script Manager?

I would put the ScriptManager at the top of the Master page outside of any Multi-View. The ScriptManager is a what is used by the Microsoft controls to provide AJAX functionality.

Introduction

Triggers

  • Triggers for a given UpdatePanel, by default, automatically include any child controls that invoke a postback, including (for example) TextBox controls that have their AutoPostBack property set to true. However, triggers can also be included declaratively using markup; this is done within the <triggers> section of the UpdatePanel control declaratio...
See more on docs.microsoft.com

The <triggers> Element

  • When working in the markup editor in Visual Studio, you may notice (from IntelliSense) that there are two child elements of an UpdatePanel control. The most-frequently seen element is the <ContentTemplate> element, which essentially encapsulates the content that will be held by the update panel (the content for which we are enabling partial rendering). The other element is the …
See more on docs.microsoft.com

Walkthrough: Cross-Updatepanel Triggers

  1. Create a new ASP.NET page with a ScriptManager object set to enable partial rendering. Add two UpdatePanels to this page - in the first, include a Label control ( Label1 ) and two Button controls (...
  2. Set the UpdateMode property of both UpdatePanel tags to Conditional.
See more on docs.microsoft.com

Under The Hood

  • Utilizing the example we just constructed, we can take a look at what ASP.NET AJAX is doing and how our UpdatePanel cross-panel triggers work. To do so, we will work with the generated page source HTML, as well as the Mozilla Firefox extension called FireBug - with it, we can easily examine the AJAX postbacks. We will also use the .NET Reflector tool by Lutz Roeder. Both of th…
See more on docs.microsoft.com

Summary

  • The ASP.NET AJAX Extensions UpdatePanel control is versatile, and can utilize a number of methods for identifying control events that should cause it to be updated. It supports being updated automatically by its child controls, but can also respond to control events elsewhere on the page. To reduce potential for server processing load, it is recommended that the ChildrenAs…
See more on docs.microsoft.com

Bio

  • Rob Paveza is a senior .NET application developer at Terralever (www.terralever.com), a leading interactive marketing firm in Tempe, AZ. He can be reached at robpaveza@gmail.com, and his blog is located at http://geekswithblogs.net/robp/. Scott Cate has been working with Microsoft Web technologies since 1997 and is the President of myKB.com (www.myKB.com) where he sp…
See more on docs.microsoft.com

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