displaying the parsed result to user got after form post method - javascript

Assumption - people in my office are not that smart / I dont want to use any server port for my below utlity :)
My Html file resides in the local disk (consider cross domain refrences constraint hile sugessting the solution)
When double clicked , HTML form opens and asks for entering order number
when entered and form is submitted , server responds back with details in the form of XML
Note : for submitting i used html POST method ,
Upto 3rd step everything works fine and i get the server response xml as next page on browser.
Now,
How to parse this response xml so that only desired data is shown on the next page when form is submitted on 3rd step , bypassing the raw response from server.
JS submit function
function submit1() // called when i click on submit button on my form
{
var actionFianl = "http://URL(other data is given as form post method)";
document.form1.action = actionFianl;
document.form1.submit();
}
And XML data is displayed , starting with
<?xml version="1.0" encoding="UTF-8" ?>

So if I understand your issue, Ajax calls are out of the question due to cross domain trouble. I remember doing something like this and found that Safari worked, but Chrome did not like it, due to cross origin policy. This was a while back and I am not certain if it was the same problem.
If I understand you correctly you want to have the XML in Javascript, instead showing the raw data independently. What comes to mind if Ajax can't be used, is having two files. The current one will have the form included and gets the XML. The second file containing the first file in an iframe, which reads the content of the iframe, when the form is submitted, and is able to read the XML.
Another solution might be something like node-webkit depending on the scale of your application. Node-webkit is an executable for windows/mac/linux which ships Webkit and Node, and runs them in a single context. Maybe you could get the XML through the Node server instead doing it through a vanilla form submit.

Related

Can I use post to click a button on a page in JQuery?

I'm trying to request a page and click a button on it without opening a window so I'm thinking post could work. Here is my code:
<!DOCTYPE html>
<html>
<head>
<title>test</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"</script>
<script>
$(document).ready(function() {
$.post(
"http://m.roblox.com/Catalog/VerifyPurchase?assetid=161075864&type=tickets&expectedPrice=1",
$("ui-block-a").submit();
);
alert("work");
});
</script>
</head>
<body>
</body>
</html>
If I'm understanding post correctly, the first argument is the url to which it requests from and the second argument is the one where you can send data. I'm trying to send a request to click the "buy" button on the page if you follow the link. Can anyone help?
A post request sends data to a given URL. What the server does with that data from that point is entirely up to the server. It is very unlikely that the web page you are trying to simulate a button press on allows that behavior. If that was possible in general, it would leave users open to some very large security vulnerabilities. For example, a site could simulate donating money via PayPal without the user ever knowing.
In this particular case, the button appears to submit a form. In that case, you could always attempt to send the request directly to the page that the form submits to, which would simulate submitting the form. However form submissions are generally protected against stuff like this, because again, it could be used to act on behalf of the user.
Basically, the best option for something like this is to provide the user with instructions detailing what they need to do, and then open the page for them.
Assuming there is no other issues like CORS you can do the post like you are trying to do, but the following is invalid.
$.post( "http://m.roblox.com/Catalog/VerifyPurchase?assetid=161075864&type=tickets&expectedPrice=1", $("ui-block-a").submit();
You are doing a POST which required the data being send to the server to be in the request body and not the URL string.
When you post to a page you are actually posting directly to the server and not a page and in this case unless the $("ui-block-a").submit(); is returning data for the page you are posting to, it is not needed.
The following would be closer to what you are looking for with that post
$.post( "http://m.roblox.com/Catalog/VerifyPurchase", { assetid: "161075864", type: "2pticketsm", expectedPrice: "1" } );
If it was successful you should see a allow-orgins error in your developer / inspector console.
$.post() is an abbreviated form of $.ajax(), with POST pre-selected as type. There are also $.get() (with GET pre-selected as type), and $.load() (with the returned data immediately injected into the specified element). But $.ajax() is the grand-daddy of them all.
AJAX is a method of exchanging data with a processor file on a server, without leaving / refreshing the page you are on. That is, with AJAX (or $.post), you can send information to a processing page on the server -- such as: my_processor.php -- the processing page can do something with the data (for example, use the data to query a database), and then echo out data, which is returned to the originating page. The received data can then be injected into a DIV on the original page, or something of the sort.
An ajax routine is usually triggered by some event on the originating page (the user presses a button, or selects a value in a drop-down, or some such). Javascript (or jQuery) code detects the event, and the AJAX code is usually actioned in the javascript event.
Here are some simple examples of what has been described.

How to pass javascript variables to rails variables

How can I pass a javaScript variable into ruby. I want to do something like this but I don't know how to express it.
function save(){
var g = document.getElementById("self").value;
<% #owner.info = g %>
}
Another possible work around is that i would need to be able to extract contents of a text area through rails and not javascript.
Can anyone help me?
What you are attempting to do doesn't make sense with a vanilla rails installation and javascript. Here's a good workflow that accomplishes what you're trying to do along with some details:
1. A page is requested from the server
The ruby code that runs rails and your application is executed on the server. The server receives a request, executes the ruby code, and sends the response as an html document.
2. A user gets the response from the server
The user's browser receives the html and turns it into a pretty web page. It's at this point that any javascript related to your application is executed in the user's browser. The connection with the server has been severed and no further ruby code will be executed until another request is made.
3. The user fills out an ajax form
On the page rendered in step 2, you have a form. Following this guide you can tell this form to submit via ajax. That means instead of requesting a new web page, the browser will send a special request using javascript to the server. The server can save the form values to your database and send a response back to the browser. All the while the user hasn't left the page they are currently viewing.
Alternatively you can skip the ajax and have the user submit the form, but you'll need to redirect them back to the page they were viewing (and probably adding a note the form they submitted was saved).

How to get POST contents before form submits using javascript

So, I know that when I submit a form whose method is POST that the server receives the contents of that form and then processes them accordingly, and then returns a page with the desired content. What I am trying to learn is what exact query url is being passed to the server side script when I submit a form on a website that does not belong to me. The reason I want this query string is so that I can make use of the server side script programatically with my own data. There is no public API served by this website, but I would like to formulate my own.
So my question is, is there a way to intercept the POST as a query string URL? Perhaps by using a javascript console in browser?
I know I can look at the source code for the page and find the names/values of the form fields. However, there also happens to be a hidden field on this page whose properties are set by javascript during validation at submission time. How should I go about this?
You can use an extension for intercept the data : Tamper Data on FireFox
https://addons.mozilla.org/fr/firefox/addon/tamper-data/
You can intercept and modify all headers requests

Save the client HTML content back to the Server as a HTML file

I want to create an HTML form on the Server. When the client completes the form and clicks submit, I want to be able to save HTML form and data in a single HTML file on the server.
The best suggestion I have seen is using JavaScript. Use a client side script that on click will save the document.InnerHTML to a var that can then be submitted back to the server.
Is this the best approach, or is there an easier way?
Even though I have no idea why you want to save the whole html code because I'm sure there will be parts that are the same for every user and you will be wasting memory, but ok.
So there are two ways to do this:
1. is javascript as you said
2. would be to put all the generated html code into a hidden form input (already on server side)
the first one seems more comprehensive and this is what I would do but the second one would also work for users with js disabled.
I wouldn't really recommend this way, because I'm still a huge fan of saving data in a database, but here's a general outline of what to do:
User fills out the form and submits.
Server-side code executes a method:
a. String holding the template for your HTML page with placeholders for the fields.
b. Use String.Format to put all the user input into the correct places.
c. Create a file, write the string to the file, and save.
d. Return file name to user.
HTML files are not that large, but still you risk using up your hard drive space. Also, you need write permissions which introduces security risks.
Going the database route:
1. User fills out the form and submits.
2. Server-side code saves the data to a database, and returns a link (with querystring string of ID and possibly a user id to help with security) to the user.
3. Whenever the user goes to the link, the server-side code repopulates the form with the ID passed.

Can you use JavaScript to detect a file download window created server side?

I have a jQuery plugin I use to dynamically create and render a form on a default.aspx asp.net page, then submit it. The page it gets submitted to is a pdf.aspx page. The page builds a PDF then uses Response.Write to write the file (application/pdf) to the browser. I use the same method to render XLSX files to the browser as well. It works really great, but I need a callback or some event to tell the button when to stop spinning. This prevents the user from continuously clicking the Excel or PDF buttons. Does anyone know a way to detect the file dialog window when it was not created using JavaScript? I am also open to other methods of callback from the server side as well.
The way I do that was suggested in response to a question I asked here a while ago by T.J. Crowder. I can't find the response from the last time I wrote this up because the Stackoverflow "search" facility is so incredibly lame, so I'll probably type in a blog post. The basic idea is that your client code (Javascript) should append an extra parameter when it submits the request for the download. The parameter should contain some generated random string (probably just the current timestamp is good enough). The server then looks for that parameter, and when it's preparing the response with the download file it also sets a cookie and gives it that random value.
Right after the submit (or right before; it doesn't really matter), the Javascript code should start an interval timer with a routine to look at the value of document.cookie and see if it contains that random string. As soon as the cookie does contain that string, then you know that the server has sent back its response and that the file download dialog has been presented.

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