Ajax Call Jquery

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  • Specifically, how does it differ from the default ( async: true ) ?
  • In what circumstances would I want to explicit set async to false, and does it have something to do with preventing other events on the page from firing ?
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  • Does it have something to do with preventing other events on the page from firing?
  • Setting async to false means that the statement you are calling has to complete before the next statement in your function can be called.
  • If you set async: true then that statement will begin it's execution and the next statement will be called regardless of whether the async statement has completed yet.

For more insight see: jQuery ajax success anonymous function scope. 3232 gold badges306306 silver badges290290 bronze badges.

290290 bronze badges. async:false = Code paused. (Other code waiting for this to finish.).

async:true = Code continued. (Nothing gets paused. Other code is not waiting.). As simple as this.

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Async:False will hold the execution of rest code.

Once you get response of ajax, only then, rest of the code will execute.

  • 3838 bronze badges. If you disable asynchronous retrieval, your script will block until the request has been fulfilled. It's useful for performing some sequence of requests in a known order, though I find async callbacks to be cleaner.

  • 3939 gold badges207207 silver badges222222 bronze badges. 222222 bronze badges. Setting async to false means the instructions following the ajax request will have to wait for the request to complete.

  • Below is one case where one have to set async to false, for the code to work properly. Above example clearly explains the usage of async:false. By setting it to false, we have made sure that once the data is retreived from the url ,only after that return php_data; is called.

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Harsh GuptaHarsh Gupta. One use case is to make an ajax call before the user closes the window or leaves the page.

This would be like deleting some temporary records in the database before the user can navigate to another site or closes the browser. 3939 bronze badges. Synchronous XMLHttpRequest outside of workers is in the process of being removed from the web platform as it has detrimental effects to the end user's experience.

(This is a long process that takes many years.) Developers must not pass false for the async argument when the JavaScript global environment is a document environment.

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User agents are strongly encouraged to warn about such usage in developer tools and may experiment with throwing an InvalidAccessError exception when it occurs.The future direction is to only allow XMLHttpRequests in worker threads.

jQuery.get( url [, data ] [, success ] [, dataType ] )Returns: jqXHR

The message is intended to be a warning to that effect.

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  • In this jQuery AJAX Example you will learn the most powerful feature of jQuery, and this is performing an Asynchronous HTTP Request. It is also known as AJAX (Asynchronous JavaScript and XML).

  • With AJAX you can update one or more areas of your web page without reloading the whole page, and thus making your application more interactive, faster and light weight. In this tutorial I will create a simple yet powerful jQuery AJAX Example, this will explain how easily you can use it in your web application.

The jQuery AJAX Method Calls the Below C# Function

I will also be doing some jQuery Validation to prevent users from inputting wrong values in the text boxes.

I will create this application in ASP.NET with C# as the programming language. I will be making AJAX call using jQuery AJAX method. Now coming to the development part, here I have two text boxes, one for name and other for email, and a submit button. When user fills both the text boxes and press the button, it sends the AJAX request to the C# function and no page postback happens.

The work of this C# function is to store the two text boxes information in the database.

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In the end the function returns the success or failed message depending up on whether the information is saved successfully in the database or not. The HTML of the Web Page and jQuery AJAX Method is given below:.

jQuery AJAX Method Code

Why I used [WebMethod] in this jQuery AJAX Example? It is an attribute that can be applied to certain functions in C#.

It is necessary that this method should be static and must have the attribute of [WebMethod] so that it can be called with the jQuery AJAX Method.

The jQuery AJAX method is called in the submit button click event. I have given the C# function’s location to the url field, and passed the values of the two text boxes in the function parameter by using the data field.

Action method to return JSON

Finally the returned message (returned by the C# function) is shown on the errorDiv. Please note that I have returned false in the last line of the click event so that the click event of this button does not bring postback to the page.

Sr.No.Methods & Description
1jQuery.ajax( options )

Load a remote page using an HTTP request.

2jQuery.ajaxSetup( options )

Setup global settings for AJAX requests.

3jQuery.get( url, [data], [callback], [type] )

Load a remote page using an HTTP GET request.

4jQuery.getJSON( url, [data], [callback] )

Load JSON data using an HTTP GET request.

5jQuery.getScript( url, [callback] )

Loads and executes a JavaScript file using an HTTP GET request.

6jQuery.post( url, [data], [callback], [type] )

Load a remote page using an HTTP POST request.

7load( url, [data], [callback] )

Load HTML from a remote file and inject it into the DOM.

8serialize( )

Serializes a set of input elements into a string of data.

9serializeArray( )

Serializes all forms and form elements like the .serialize() method but returns a JSON data structure for you to work with.

jQuery AJAX call to MVC controller

Showing Loading Image During jQuery AJAX Calls. You can use jQuery AJAX Events to show a loading image whenever a jQuery AJAX call is made.

Similarly hiding this image when the AJAX call is finished.

Sr.No.Methods & Description
1ajaxComplete( callback )

Attach a function to be executed whenever an AJAX request completes.

2ajaxStart( callback )

Attach a function to be executed whenever an AJAX request begins and there is none already active.

3ajaxError( callback )

Attach a function to be executed whenever an AJAX request fails.

4ajaxSend( callback )

Attach a function to be executed before an AJAX request is sent.

5ajaxStop( callback )

Attach a function to be executed whenever all AJAX requests have ended.

6ajaxSuccess( callback )

Attach a function to be executed whenever an AJAX request completes successfully.

Additional Notes:

For this we can use the ajaxStart and ajaxStop functions.

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The updated code is given below:.

Kindly check the below link for this tutorial:.

I hope you learned this jQuery AJAX Example and now can go on and use it in your websites.

The jqXHR Object

The jQuery AJAX is very useful for making complex looking things in a better manner.

With it, you will reduce your code’s length and will make your web application faster, manageable and lighter.

The jQuery AJAX will also benefit your server by giving it less load, and so it is a win-win situation for both website administrators and their customers.

version added: 1.12-and-2.2jQuery.get( [settings ] )

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This article gives you details about how you can implement jQuery AJAX calls to ASP.NET MVC controller and display JSONResult on view.

version added: 1.0jQuery.get( url [, data ] [, success ] [, dataType ] )

For this tutorial, we will use the Northwind database.

If you do not have Northwind database you can download from here.

You will have a DropDownList filled with Northwind.Categories table.

Deprecation Notice

You may check for ways to bind MVC DropDownList.

On selection change of this DropDownList, a jQuery Ajax call will be made to the controller.

The controller will return JSONResult and success part of ajax call will display JSONResult.

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Follow the below steps to implement jQuery AJAX call to MVC Controller and display JSON result.

Open your Visual Studio and create a empty ASP.NET MVC application.


Click on File -> New Project -> Web -> ASP.NET web application.