I need to get response data (incuding html markup) on server and then replace them to anothe one and send to the client.
Is where the best way to do this?
Response.OutputStream is closed for reading.
So what can I use for reading data?
I need to get response data (incuding html markup) in controller
For obvious reasons that's not possible. The response HTML is generated when the view executes, at a much later stage after the controller action has finished executing.
If you want to modify the response HTML you could write a response filter.
Related
So the scenario is getting data we need from controller and using it in our view. But there are two options, you can have either this line in your "show" method:
UserController#show
return view('webpage');
And in the 'webpage' you can send an Ajax request to UserController#fetch and get that data. Or you can get the data from database in UserController#show and then send it alongside view like this:
UserController#show
return view('store', compact('store'));
But which is the more efficient and secure way of doing this?
It really depends on what you're doing, if the data you're requesting and the process you're running takes a lot of time or in a future it would, ajax is the way to go, but if process is short and the requested data from your model is small, then you can request it on the same method that returns your view and send the data to it.
I've asked a question about what is "rendering a view". Got some answers:
Rendering a view means showing up a View eg html part to user or
browser.
and
So by rendering a view, the MVC framework has handled the data in the
controller and done the backend work in the model, and then sends that
data to the View to be output to the user.
and
render just means to emit. To print. To echo. To write to some source
(probably stdout).
but don't understand then the difference between rendering a view and using the Response class to send the output to the user using its sendResponse() method. If render a view means to echo the output to the user then why sendResponse() exists and vise versa? sendResponse() exactly sends headers and after headers outputs the body. They solve the same tasks but differently? What is the difference?
In ZF, rendering a view doesn't actually output any content. Instead the rendering process returns the content as a string to the caller. Zend_Application automatically takes care of taking the rendered view and inserting it into your layout (assuming you use layouts) through a placeholder, and putting that data into the Zend_Controller_Response_Http object which is ultimately responsible for delivering the content to the user. The reason for the Response object is so it can encapsulate your HTML output, and also manage any additional HTTP headers or redirects you want to send.
You can also manipulate further the contents of the response in the Response object prior ot sending the data to the client if you wish.
sendResponse() takes care of sending any headers (including the HTTP response code), checking for any exceptions that may have occurred (due to not being able to send headers or other reasons) and then sends the HTML which could include your layout and one or more rendered view scripts.
Hope that helps.
They are two very different things.
Rendering a view provides another layer in which you can template your data. This will allow you to easily dynamically populate HTML/templates keeping logic seperate from presentation.
Echoing data directly skips this step, and is usally reserved for reterning json/xml (data) responses to user instead of html response.
You didn't post which framework you are talking about but both should allow you to specify response headers.
Please don't oversimplify. Every server's purpose is to render resource but that doesn't mean they are all the same.
I want to change the list of available values in a dropdown depending on the value selected in another dropdown and depending on values of certain fields in the model. I want to use JQuery to do this. The only hard part is checking the values in the model. I have been informed that I can do this using Ajax. Does anyone have any idea how I will approach doing this?
AJAX is indeed the technology your looking for. It is used to sent an asynchronous request from the client browser to the server.
jQuery has an ajax function that you can use to start such a request. In your controller you can have a regular method tagged with the [HttpPostAttribute] to respond to your AJAX request.
Most of the time you will return a JSON result from your Controller to your view. Think of JSON as something similar to XML but easier to work with from a browser. The browser will receive the JSON and can then parse the results to do something like showing a message or replacing some HTML in the browser.
Here you can find a nice example of how to use it all together.
$('submitbutton').addEvent( 'submit', function(e){
e.stop();
$('fuss').send();
req2.send();
});
trying to get this working but not sure if it is possible and had no success so far.
Mootools docs doesnt helped me either.
Will the multiple usage of .send() work?
Do i have to specify the data beeing send for the html request or does it take automatical the data beeing send by the form ?
It's in the documentation: http://mootools.net/docs/core/Request/Request#Element:send
This shorthand method will do a request using the post-processed data from all of the fields.
You can do as many requests in a specific event as you wish, as long as they're all asynchronous.
In your specific example it would seem you want to do two requests using two different methods, one with setting up a new Request class manually and the second doing it via the Element Method.
Based on your last comment, I wrote a little example in jsFiddle.
Basically I think you don't need two request for your goal. Just override onRequest method to update the html.
I am trying to send data to my jsp via:"xhr.send(projectCode);"
but apparently the parameter is not received when I am trying to realise it with System.out.print it is a null displayed.
so the story from the begining. my javascript function send the parameter to the jsp whitch construct an xml file and resend to the first one.
this will reconstruct my second dropdownList with the xml code constructed and received.
so the problem that the parameter dosent sent at all.
What should I do.
Just note in case the syntax whatever you have sent is like this:
url="postjob2.jsp?param=" + param;
After param=" keep a space and then the parameter. My issue got resolved as soon as I entered the space.
The simplest all-round solution is to run your application with a HTTP-tracer, such as fiddler for windows or wireshark. In that way you can see if the proper data is being submitted from your client to the server Given the amount of details you provide, I think this is the best starting point