I know two ways of submitting form data: by having a button of type submit or by an AJAX post call. What is the difference between those two regarding performace?
This is a very general question, so here is a very general answer.
If you implement the AJAX call efficiently on the server, then you can expect AJAX to be more performant (when measured on the server) than a full page round-trip.
For instance, if you use ASP.NET, clicking a button to submit a page will cause a POST of the form data and a complete re-buildup and rendering of the page. That is not necessary with an AJAX call, if you use real AJAX and not the Microsoft AJAX Control Toolkit for ASP.NET.
Better to use Ajax.BeginForm instead of Html.BeginForm. It will prevent the full postback and will improve the performance.
Ajax POST
Ajax post prevents reload and postback.İt sends data to controller.
Form Data
İt occurs reload page and postback.İt sends data to controller.
Related
So I'm able to successfully integrate AJAX requests with Spring MVC. However, I have a problem- if I click the "submit" button of my form, my #Controller class detects the url and returns a ModelAndView. However, what I want is that there be an AJAX check first, and if the form submission is not successful (e.g., blank fields), return an AJAX response. Otherwise, proceed as per normal and display a ModelAndView. However, I have no clue how to integrate both at the same time.
Any ideas or tutorials are appreciated.
Thanks!
You have several choices:
submit the form to a specific, different URL, when using AJAX
add a specific parameter to the request when posting using AJAX, and use this specific parameter to check if the request is n AJAX request
test if the X-Requested-With request header is present and contains XMLHttpRequest
I would go the PJAX route or what's also known as HiJax.
Basically you return a subset of the page if it's an AJAX request using headers. Most people than just use conditions in their view/template to decide to include the full or chrome-less HTML.
I have created an MVC application that uses webgrids to display data on my views. In my grid's toolbar I have drop downs, text boxes and a search button that call Jquery to perform various actions. For example, if I click the search button, I refresh the grid via Ajax based on a text entry. This all works well until interaction with the webgrid (page or sort) occurs. We noticed that if any ajax calls are made, then the sorting and paging do not work anymore. Also, if I load the page and page or sort first, then none of my JavaScript works. I have been researching this issue, but have not seen any concrete solutions. Does anyone have recommendations for a solution?
I would wager to guess that you are attaching your jquery handlers in the document.ready function using something like $("#Sort").click(function(){});. When you reload the grid via an AJAX call, the jquery handlers are not reattached since the DOM was not reloaded. Try using something like this $("#Sort").live('click', function(){}); which will attach the handler to any instance of your identifier once it is present on the page.
This is was a complete guess since you posted no code, but this and the post you referenced above (SO post) seems to have fixed your issue.
I am an average newbie to CakePHP. While reading cookbook found Ajax form and its submission. But it lacks more details.
What are the main difference between ajax form and a normal form or What are the more specific cases we need to use Ajax form over normal form?
An example will be appreciated
Thanks....
A properly implemented Ajax form is exactly the same as a regular form, except that if JavaScript is enabled a submit handler will be bound to it that will prevent the normal submission of the form and send the data using the XMLHttpRequest object. The response will then be processed by JavaScript in the current page instead of by loading an entirely new page.
This isn't necessarily a CakePHP question, it's understanding what AJAX is.
AJAX in layman's terms is basically submitting data to a website without reloading the current page. If this is the sort of feature you want, you'll need to look into the RequestHandler component and the JsHelper in the CakePHP book for the version you are using.
I have a Telerik MVC Tabstrip.
I have used:
.LoadContentFrom("Grid", "Orders");
"Grid" Action just returns view without model. Then the Ajax request should have been fired to get the data.
It is loading the grid normally but it is not calling the Ajax request to fill the data.
If I am calling the same action normally i.e. without ajax it displays grid and fires Ajax request to load the data.
Perhaps you've missed to register the required JavaScript files for the Grid. You can check the following help topics:
Loading components in tab content
Required JavaScript files
Check the sample available at here.
This one uses MVC 1.0 but can be surely converted to MVC 2.0
I read some paragraphs in a book saying that it is not possible to do a partial postback for web, even AJAX is employed. Ajax will postback everything and update only ajaxfied controls.
However, on pages I made using ajax, I used Fiddler to monitor the transportation. I found when the page initial load, it loaded everything include pictures .... However, when I click a button and do a ajax postback. I can only see the some data were loaded.... Looks like it doesn't need to reload the whole page again.
I don't know if what I see is correct? Or the book I read is correct?
Thank you guys.
That depends what you put in the term "postback".
The AJAX call will send the complete form data back to the server, just as if the form was posted normally. The server will answer with a partial response that only contains the parts of the page that should be updated.
So, the request is not partial, but the response is.
I am not sure how you are posting back from the client side. I am guessing you are using UpdatePanels. How well you 'AJAX-ify' a web page depends on what method you employ.
UpdatePanels - Read Dave Ward's posting on them - http://encosia.com/2007/07/11/why-aspnet-ajax-updatepanels-are-dangerous/
PageMethods to post back to a web service, get the data and update the DOM to display the result
JQuery and other such AJAX frameworks to post back to a web service
I am sure the link above should clear things up a bit
I'm having a hard time understanding your terminology. I'm not really sure what a "postback" is, much less a "partial" one. I do know that one of the basic ways to transmit information to an HTTP server is via a POST request, which is usually used when submitting forms. If you mean to say that the entire form is transmitted when you click a submit button, I believe you'd be right.
You also seem to be doing something with AJAX, but it's difficult to tell. The whole point of AJAX is to have dynamic data displayed on a page without resorting to reloading it. Defining what to send and what to do with the results is entirely up to your own JavaScript. So unless you're using a framework, which you don't specify, there is no such thing as "ajaxified controls."
In any case, "AJAX" usually means using the XMLHttpRequest() method of modern browsers to send data to servers without refreshing the page. When you call this function, you specify exactly what data to send. This has nothing to do with HTML forms. One caveat: if you are indeed using a library for AJAX, it might impose additional limits on how you structure information to send.