Develop Reference

Workaround for Error 414 when opening file from PHP script

I have a PHP script that's outputting a CSV file and up until now I've been just using a link and passing parameters that are used to determine the output in the GET data. However recently the size of the data increased and now that code gets Error 414 - Request URI too Large. I tried using a hidden form to do it with POST but it just reloaded the page and didn't supply a prompt to download the file and all of the suggestions I've been able to find online about doing it with AJAX suggest using a link with GET data instead. Does anyone know a workaround that will have the browser still let the user easily download the data?
Presently I'm just setting the href attribute of a <a> tag.
$("#exportCSV").attr('href', "myscript.php/?data=" + exportData);
exportData has become too long for GET data but I want to maintain the behavior where if you click on a link that has say a CSV file being outputted the browser provides a download dialog for the user.

Find out when document.location.href has been completed

I have a button that lets users download a file.
The file is returned from the server in the Response (binaries set as attachment), and I am letting the browser handle the file download from there on out.
Im doing the following on button click:
var fileUrl = 'mysite.com?id=12345';
document.location.href = fileUrl;
This will load the file, however, it can take a couple of seconds. I would like to show a preloader but then ofcourse I have to know when the file has been downloaded completed. Since I'm staying on the same page, is there a method or callback that tells if the 'new' location is loaded and thus I can hide the preloader?
Thanks!

Assuming you can download the file twice, you could load the file in a hidden iframe and detect when the iframe is done loading. Then, the file is already cached and should download quickly.

JavaScript retrieve window handle from target=_blank submitted form

I'm trying to create an automated script that lets me download various files from a website, then upload them to a new website. The script will let multiple users copy content from the old site to the new one at the same time.
I initially attempted to use AJAX to download one file at a time, and store the file(s) data in variables, then upload this variable (file data) to the second domain. The download worked fine, but the PHP page on the second domain always threw back a 500 request error message AFTER uploading, despite setting various file size parameters and processing time parameters in PHP. This meant I couldnt even see what was echoed by the PHP page to debug, and continue developing that method.
After spending a long time trying to fix this (and failing miserably), I decided to just let the users download the old files normally, then use a form to upload the files. As I want the script to continue to run whilst the file is uploading, I've decided to set the forms target to "_blank" to open a new tab (which uploads the file).
How can I retrieve the windows handle that's opened with the target="_blank" form, to test when the window is closed? I don't need to access the windows HTML, I just want to check when it closes. The page that's opened by the form is not on the same domain as the form that opens it, but the "Access-Control-Allow-Origin" header is set to "*" on the second domains PHP page.

I don't think you can retrieve the window handle, but you can use Javascript to keep a reference to the window and check whether the window is closed or not. You would have to open your window with Javascript like this
var uploadWindow = window.open("http://www.google.com");
Then you can use a function on a timer to monitor if the window has closed or not:
var interval = 250;
setTimeout(checkClose, interval);
function checkClose() {
if (uploadWindow.closed) {
// Code to run when window is closed
}
else {
setTimeout(checkClose, interval);
}
}
I hope this can be of help

Getting contents of a local file in Javascript

I've currently got a folder with 2 files in it. The first file is output.log which is the text that I want to somehow load into the javascript code. The second file is view.html which contains the javascript. The html file will only be opened on the local users machine and not on a website.
I've tried to embed output.log as an iframe and read the contents, but that has not worked.

The browser prevents a script from manipulating data in an iframe if the origin of the data contained in the iframe is different from the containing web page. This is to prevent cross-site scripting attacks.

You could use the jQuery get() function and then output the returned content to a named <div> element
$(document).ready(function() {
$.get('path/to/output.log',
function(data){
$('.somediv').html(data);
}
);
});

IE extension - Injecting Javascript file

I am developing an IE extension which works on sites opened in Internet Explorer. It is designed to work the same way as a chrome extension. I am trying to implement the Background function of chrome extension using c++ and the content script by injecting JS into the current web page. The content script, I am trying to load via IHTMLWindow2 execScript on Document load event. Now that I need to inject JS files directly I tried the following.
Had the JS file under a folder inside the Project destination and tried to inject using physical path.
std::wstring filePath(_T("d:/xx/xxx/x/x/Content/myFile.js"));
scriptText = scriptText+ filePath + endScript;
VARIANT vrt = {0};
HRESULT hrexec = ifWnd->execScript(SysAllocString(scriptText.c_str()),L"javascript", &vrt);
The scriptText has some javascript code to create script element with type and src attributes. The filePath holds the physical path towards the js file.[Also tried relative path but it was a no go]
The above was not working correctly in IE9 due to mixed content issue, upon which I researched to figure out that IE9 expects the js file to be retrieved from a server rather than local physical path. The console throws me the below exception.
SEC7111: HTTPS security is compromised by file:<filepath>
SCRIPT16388: Operation aborted
I am pretty much not sure is there any round about for injecting Javascript to the current DOM from the physical path. Please help me on this.
Also let me know is there any other possibility of injecting the JS file from the current working directory into the DOM.

You don't have to inject a <SCRIPT> tag in the DOM.
If your js file contains:
var strHello = "Hello";
function SayHello() { alert( strHello ); }
you may just read the file into memory, construct a BSTR string with it, and pass that string to IHTMLWindow2::execScript.
Later, another call to execScript with the string SayHello(); will popup the alert box. The code you injected is still here.