Is there a tool in CakePHP to send POST data before a redirect and to be valid only one request? Something similar like in Laravel's Flashdata.
I'm trying to redirect back and keeping the form with the previous data.
I know there is way using session, but it requires extra work, like removing the data after the submit is completed
Related
It took me a while to understand this, being that it was a little obvious. I will answer myself, so other can benefit of the answer and ofcourse to see if there's a better way to do this. The problem was based on Axios/Yii2 but I guess this will apply equally to other frontend libraries/frameworks sending data to Yii2.
I needed to post data from a small form made on Vuejs, sending the request Axios to a Action/Controller on Yii2, so data is sent on a simple POST request and the post is getting to the controller, but I was not able to receive the data on the action, $_POST | $post arrives empty (checked using xdebug).
As much as I remember, this had something to do with security. But I already tried by disabling public $enableCsrfValidation, so that was not the problem.
public $enableCsrfValidation = false;
But no matter what, data was not being added to the request/post data inside Yii2.
The following Image, explains the problem you will find there:
The Axisos method that sends the post with test data.
The Yii2 Action stpoed at the place, I should be able to see data.
The capture of the xdebug variables and data for the request.
The capture of Chrome where you can check the payload is sent.
The answer is as I said "kind of obvious", but I could not see that, and I am sure some other devs will probably fall on this.
After searching like crazy and asking everyone, I tried sending the request by using Postman app, yup the best thing I know to test apis.
Dont forgue to add the xdebug cookie to be able to debug your PHP Endpoint.
There I found the first clue «the obvious part», I was not sending data as a form-data, Axios and other libraries, send the data as a raw (application/json) payload.
This means that Yii2 will no be able to find the data inside the post request, yes its there but Yii2 magic will not work, neither you will find this data inside $GLOBALS or in $_POST.
So reading the Yii2 documentation I found that inside request I can use a function that will help me recovering the Raw data, so to do this use the following line:
$raw_data = Yii::$app->request->getRawBody();
Now, that data gets to you as a simple, raw json string, so use the power of PHP to parse it to an object.
$object= json_decode($raw_data );
And finally use the data inside by calling the properties you look for, sent on the pay load:
Json Payload:
{
"msg":"This is my payload",
"id":"11"
}
To use it:
echo $object->{'msg'}; // prints: This is my payload
So that's the way to handle that, now I would like some other points of view to see if there's a better way or cleaner way to do this. Hope it helps.
I have a page html let's call it abc.html
There are AngularJS fields embedded in it.
I am now writing a GET and POST in scala which routes the fuzzy search arguments to the proper page on the server.
I am trying to understand the sequence in which things occur in order to implement a GET/POST requests (written in scala) which would happen when someone makes a search on the search bar on the abc.html page, and which would return elements from the database
Is it abc.html (search) --> http GET request --> backend ( AngularJS) --> Database?
In this case this would mean my http post or get request would pass in the html data model elements which would in turn hit the backend AngularJS controller page which in turn would hit the database, and the return ride would send the database results via an http request to the page?
Do I need to explicitly define my GET in terms of angular fields and the database model?
thanks
HTTP uses request-response pairs. This means you don't have to make another request to return anything to the client, you just need to write the proper response. Other than that, your idea is fundamentally right. The process would look something like this:
Type something into the search form on your HTML page
Submit the search form to your backend. This creates a GET or POST request depending on your form element's method attribute.
(At this point the browser is awaiting a response)
As the request reaches the server, your backend code can capture its data and make a query to your database.
(At this point the server is awaiting data from the database)
The database returns its results, your backend code is free to format it into a response to the client's original request.
The client receives the response and you can use your frontend code to display it to the user.
I am creating a dashboard application in which i show information about the servers. I have a Servlet called "poller.java" that will collect information from the servers and send it back to a client.jsp file. In the client.jsp , i make AJAX calls every 2 minutes to call the poller.java servlet in order to get information about the servers.
The client.jsp file shows information in the form of a table like
server1 info
server 2 info
Now, i want to add one more functionality. when the user clicks on the server1, I should show a separate page (call it server1.jsp) containing the time stamps in which the AJAX call was made by calling.jsp and the server information that was retrieved. This information is available in my calling.jsp page. But, how do i show it in the next page.
Initially, i thought of writing to a file and then retrieving it in my server1.jsp file. But, I dont think it is a good approach. I am sure i am missing a much simpler way to do this. Can someone help me ?
You should name your servlet Poller.java not poller.java. Classes should always start with an uppercase. You can implement your servlet to forward to a different page for example if sombody clicks to server1 then the servlet will forward to server1.jsp. Have a look at RequestDispatcher for this. Passing information between request's should be done by request attributes. if you need to retain the information over several request you could think about using session.
In the .NET world, we use SessionState to maintain data that must persist between requests. Surely there's something similar for JSP? (The session object, perhaps.)
If you can't use session state in a servelet, you're going to have to fall back on a physical backing store. I'd use a database, or a known standard file format (like XML). Avoid home-brew file formats that require you to write your own parser.
I am trying to validate that a username is unique on a registration form and would like to verify the uniqueness of the username right after the client types it as opposed to performing this server side after the form has been submitted.
Should I collect a resultSet from the database, store it in an array and then pass this along to the jsp page in the form of a bean (I am using a model 2 design so the user passes through a servlet before arriving at the jsp page)? What if the array is very large? How do I bring this data into javascript?
Alternatively, is there a way to do the query using ajax and javascript all on the client side? Maybe its possible to somehow run the query in the background?
I am really just looking for some direction because I am clueless as to what to even begin researching something like this. Is this even a smart move, performance wise?
I'd use "AJAX" for this.
Here's one approach: set up a blur() handler on the username text field of your form. When the blur() method is invoked, you post the username to the backend code; it verifies it and returns some appropriate response. You then parse the response and change the CSS class on the username text field (e.g., turning it red) -- or do whatever else visually you want to do to indicate "username in use."
Either way, you've got to get the username from the client to the server for verification; you wouldn't want any mechanism which allowed the client to directly use the DB (think security/exploits/etc).
If you're not already familiar, check out jQuery (http://jquery.com/) to make your client-side life much easier.
I don't understand. I have searched all internet forums but found nothing helpful. I am trying to update the numberOfLikes field on my postsTable in MySql when the user clicks on the like button. I know this is done through ajax but I am only familiar with prototype ajax and none internet forums state anything about it.
Here's the flow chart
1. On "seeForums.php" user clicks on the "like" link.
2. The like link has an id that triggers the function which updates numberOfLikes on my postsTable.
Thats it. Thats all I need. But I need it in a prototype ajax format, something like this.
function processLikes()
{
new Ajax.Request(theUrl,
{
contentType:"text/HTML",
onSuccess:updateLikesMySql,
onFailure:error
onException:error,
});
}
Helps are appreciated :)
You can't do this with Javascript alone as it is client side only, you'll need to get a server side language (e.g. PHP) involved as well.
The idea is that you send an AJAX request to your PHP file along with the data that you want to update, and your PHP file will handle inserting values into the database. That PHP file would then print an output (e.g. success or failure) which would be received in your Javascript so you can act accordingly.
You should know that the nature of HTTP (web) makes it Request/Response like.
So your backend code runs on the server,
And javascript and all frontend code run on the client.
Client has no access to your database, So you can't do anything to your database with Javascript.
Best thing you can do is ask your serve with javascript to update the database,
Make a server-side script available at some URL,
Then use ajax to call that URL.
In the server-side script, do the code which updates the database.