Table of Contents
What is ASP AsyncPostBackTrigger?
Description. Specifies a control and event that will cause a partial page update for the UpdatePanel that contains this trigger reference. Specifies a control and event that will cause a full page update (a full page refresh).
What is the purpose of AsyncPostBackTrigger in the update panel?
Use the AsyncPostBackTrigger control to enable controls to be triggers for an UpdatePanel control. Controls that are triggers for an update panel cause a refresh of the panel’s content after an asynchronous postback.
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 a ContentTemplate asp net?
The ContentTemplate property contains the content that appears inside an UpdatePanel control when it is rendered. You can create the template’s content declaratively or programmatically. The content template of an UpdatePanel control is a single-instance template.
What is templating in HTML?
The tag is used as a container to hold some HTML content hidden from the user when the page loads. The content inside can be rendered later with a JavaScript. You can use the tag if you have some HTML code you want to use over and over again, but not until you ask for it.
What is difference between synchronous and asynchronous request?
Synchronous request — (Default) Where the client blocks and waits for the result of the remote request before continuing execution. Asynchronous request — Where the client continues execution after initiating the request and processes the result whenever the AppServer makes it available.
What is the use of asyncpostbacktrigger in Ajax?
The AsyncPostBackTrigger is specified in the AJAX UpdatePanel in order to fire the SelectedIndexChanged event of the DropDownList using Partial PostBack. When an item is changed in ASP.Net DropDownList, the following OnSelectedIndexChanged event handler is executed.
How to fire the selectedindexchanged event of the dropdownlist using partial postback?
The AsyncPostBackTrigger needs to be specified in the AJAX UpdatePanel in order to fire the SelectedIndexChanged event of the DropDownList using Partial PostBack. The SelectedIndexChanged event will work / fire / trigger only when the AutoPostBack property of the ASP.Net DropDownList is set to True.
How does the selectedindexchanged event work in HTML markup?
The SelectedIndexChanged event of will work / fire / trigger only when the AutoPostBack property of the ASP.Net DropDownList is set to True. The HTML Markup consists of an ASP.Net DropDownList specified with OnSelectedIndexChanged event handler and AutoPostBack property set to True.
What is an asynchronous trigger control?
Controls that are triggers for an update panel cause a refresh of the panel’s content after an asynchronous postback. Defining an asynchronous trigger control is useful in the following scenarios: