Send Binary Data With IE 7's XmlHttpRequest
Sep 18, 2008
I'm reading the content of a local binary file with the method mentioned here: [URL]
Then I'm getting the data as a string where each character represents the binary value. I have successfully sent that string with Mozilla's XmlHttpRequest's sendAsBinary method, but IE 7's version doesn't have that method...
Using the send method almost works, the only problem is that binary content can be represented as the asciicode 0. This means that the string read by sent is cut off as soon as it is encountered. That means that the part before the first NULL character (asciicode = 0) is successfully sent to the server.
The solution I have made right now is to increment each character's asciicode on the client side by one and decrement them on the server before converting the character to the binary representation. The downside with this is that the size of the data sent between the client and server gets larger than the original filesize. Ex: 8kb file grows to ~12kb.
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Dec 8, 2005
I've search far and wide for an answer, so forgive me if this is a
stupid question. (Well, it probably is.)
Consider the following javascript:
var foo = new Image();
foo.src = "http://some.server.com/some_filename.gif";
Now, the browser will retrieve 'some_filename.gif' from some.server.com
and put it into the object foo. What I want to do is then subsequently
analyze the actual binary data contained inside some_filename.gif.
(Specifically, I just need to look at the first few bytes.) Is there
any way to do this in just JavaScript?
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Dec 19, 2009
I'm trying to get the binary data of an image object.
I've found articles to writing binary to be the source of an image, but they don't tell you how to do the reverse. Pretty much, after the page loads I want to do something like.
myImg = document.getElementById('cow.jpg');
binData = myImg.somethingToGetBinaryDataPlese
For those that are curious why I'm doing this its for another project I'm working on where I store the binary data somewhere else after load, but for technical reasons this has to be done client side for if I do it server side I'm not getting the results I need for this project.
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Mar 2, 2009
Im trying to implement dynamic images on my site. Basically, there is a list box, and when the user selects an option, it calls a service that streams back a base64 encoded image that will be the preview of what they're looking at.in FF you can do this: img.src = "data:image/png;base64," + args ; This doesnt work for IE. from what ive learned, IE doesnt support this type of inline coding.
I was thinking that maybe the next best solution would be to convert the base64 back into binary, and set the new image object to that source. something like this:
Code:
var img = new image();
img.source = binarydata;
now obviously, img.source isnt a real method. but i would like to be ale to set the binary data as the image.
possiblities: Is there anyway to save that binary as a file on the client? and then be able to reference that file as the picture img.src = "images/" + newfilename;
Some other alternatives is to stream back a reference on the server to get the picture, this would require two callbacks, which i dont want.
Also, there is a method of turning the image into a big array of HTMl elements, and each element holds a color, being a pixel. im not doing that, that is the biggest hack job i have ever seen.
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Feb 12, 2010
I'm trying to get an xml file using an xmlhttprequest with the GET method. My request works fine with any browser except internet explorer. This one send no http request at all. (using wireshark to monitor).I thought about a caching issue but it should work at least once.
My code is the following:
var req;
var xmlDoc;
function GetXmlHttpObject()
{
if (window.XMLHttpRequest){
[Code]...
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Jun 10, 2009
i have a problem dealing with an xmlhttprequest with the POST method: i receive a string from a java applet in my page and i want to use this string as a post parameter to send an xmlhttprequest, but once i send the request the string becomes empty. i put some debug alert before invoking the send method and they show the string properly. the string comes from a new String(byte[]) in java, so i thought maybe there's somethinig related to the charset?
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Jul 23, 2005
I am playing with the XMLHTTPRequest method to perform client/server
transactions. I have it set up right now so that when readyState is 4,
it takes the XML and processes it. This works great until there is alot
of data. In that case, the user will have to wait for the data to come
back which may take a minute or so.
I don't want the user to have to wait. Is it possible for javascript to
periodically (while still receiving more data) stop and display what it
has received thus far? I guess this would be considered a type of
streaming.
In mozilla/firefox, I have read that I can use readyState 3 to run my
callback function every 4096 bytes. I can then take those 4K, parse
them, and then continue on. However I have also read that IE cannot do
this. Since I need this to work in IE, is there a workaround?
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Jul 23, 2005
My JavaScript is trying to POST data to a CGI script (Perl) using
XMLHttpRequest. My CGI server gets different data from IE than Mozilla
Firefox.
// For Mozilla, req = new XMLHttpRequest();
// For IE req = new ActiveXObject("Microsoft.XMLHTTP");
req.onreadystatechange = requestHandler ; // function to handle async
response
req.open('POST', myURL, true); // use POST
req.send('foo=11&bar=22') ;
A Perl CGI script prints the parameters passed to it.
$q = new CGI ;
foreach my $param ($q->param) {
print "$param: " . $q->param($param) . "
" ;
}
The data received by the CGI script is inconsistent, depending if the client
is IE or Mozilla (Firefox)
Server result from IE client:
foo: 11
bar: 22
Server result from Mozilla Firefox client:
POSTDATA: foo=11&bar=22
It seems that the POST data IE sends is more correct than the Mozilla data.
Is there another way to send the data in Mozilla so the CGI script will give
the same results. I could easily adjust the CGI script, but I think the
problem is at the client.
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Oct 14, 2007
I'm working with a pretty large XML file, but I really only need to
display a few things that requires quite a few transforms. I already
limited to the transforms to the data i need to use, but I'd like to
speed things up by loading only the data I need.
I need to mention that this is for a local application that sometimes
will lookup updates on a server, but mostly, it is for local use
(offline)
I can use xmlHTTPrequest for both local or server data access. That
seems to work fine. Now I would like to be able to load only the data
I need.
I hear the Google suggest tool bar uses xmlHTTPrequest to look up a
list of known queries, so I am hoping they lookup "only" the necessary
data as one types. It's kinda what I want to do, but I'm not sure how
that would work, since the "url" parameter should be a destination
file name.
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May 9, 2010
I am having trouble populating elements from the following Yahoo RSS feed: [URL] I need to show the current weather conditions when a button is clicked. Here is what I have so far.
[Code].....
I need to populate the <h1> and two <p> elements. I know that the copyWeatherData() and getWeatherData() functions are not coded properly.
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Apr 3, 2006
I am going to use the server push
for streaming the data by keeping the connection open. At client side,
i am having the XMhttprequest object (i.e ActiveX object of IE). When
the data comes, onreadystatechange method get callback on state 3 but
it doesn't allow me to read the data from the object. It says 'The data
necessary to complete this operation is not yet available'. Is it
possible to read the streaming data from the XMLHttprequest object in
IE?
I know Mozilla supports to read the data, when the ready state is 3. In
Internet Explorer, how we can use the XMLhttp Active object to read the
streaming data.
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Mar 20, 2009
I am trying to read data from server using AJAX XMLHttpRequest.responseText.In received data, there are lot of similar type of characters which has tge value of FFFFFD (65533). I think, all characters which has the value above 127 are converted to default character.
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Aug 6, 2006
I am trying to use javascript just to make a gui for a program written in C++. I am having trouble finding any information on how to input data obtained from a user in the javascript application into the C++ program if it is even possible.
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Mar 30, 2009
I have been directed from .NET section to this section. My original post and question are here. forums.devshed.com/net-development-87/asp-net-how-to-send-data-to-parallel-port-600691.html
Is it possible to send data to parallel port using javascript?
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Apr 25, 2010
I'm trying to send data to 2 different functions using the same selectbox. 1 function only needs a "ID" as value like this:
Code HTML4Strict:
<select name="ccountry" onchange="getState(this.value)">
<option value="1">USA</option>
<option value="2">England</option>
</select>
The other one needs an url like this:
[Code]...
I have an idea, but not sure how to do it... If I use the last example and then somehow in my javascript function would be able to, like in php, extract the code=1 so I would get only the "1"...
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Sep 29, 2007
I wonder, what is the simpliest way to send data to PHP script from Javascript? For example, user clicks some image and JS runs some PHP script in background (so browser keeps loaded page) which makes few MySQL queries etc.
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Jun 22, 2007
I want to send form data to given email id, I'm using mailto:ur@mail.com, but it doesn't working it dirsctly goes to localSystem A/C i.e outlook.. Code:
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Jul 12, 2009
I would like to send my form data to a php file but not to get any response. I want to send an ID so that PHP can do MySQL search and generate a PDF file. Problem seems to be that PHP is responding something back to HTML and that is messing my code. So I just want to send the data and run the scripit in PHP so that nothing is returned back to HTML.
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Oct 29, 2010
eg topic, see "HERE THE VALUE" in the script, I want to send: selected.val()
<script
type
=
"text/javascript"
[Code]....
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May 11, 2011
The script below works, but only returns one headline/url from the html list.I am coming from a procedural background and know there must be a better way to pass all the urls and headlines (the link text) to my PHP script, which populates my database, but even after reading 'Jquery in Action' I am flummoxed.how to attack this problem? The .each portion of my script does not seem to work as I expect it to. I have also tried append, which would seem to be a solution ... really all I need is the "which" value from the url, so passing a simple array of those values to PHP would suffice.
<SCRIPT>
$("#latest-news button").click(function () {
$.each(function()[code]....
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Oct 25, 2009
I have been using Ajax to send data to php scripts and I would like to send text data from a textarea of a form. Normally I send data to the script with the following code...
How can I send larger amounts of data to the php script? Can the url contain 750 characters? I think the limit is 255 characters.
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Nov 19, 2010
My HTML:
<form action="mail.php" class="contactForm" name="cform" method="post">
<div class="left">
<h1>Insurance Details</h1>[code]....
thank you message loads in a new page. BUt if I delete this line: var gender = document.getElementsById('gender'); The form run properly, when submit button is click, it will hide the forms and replace by a thank you message but problem is the data send in the email is not the right value eg. in Gender: I select Female. BUt I receive Male as value. Why is that?for live demo: http:[url]....for full Script Code: http:[url].....
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Oct 12, 2005
The purpose of these scripts are to allow you to send forms using javascript. If your server doesn't support scripting languages like php or perl, or if you are unfamiliar with those languages, then this is an easy alternative for you.
When you send a form using the mailto: command, the data gets sent using the post method and in the process gets reformatted. When you receive the form data in your email it will contain hexadecimal characters, spaces will be replaced with + signs, and each value will be separated by an & sign.
You have two options when sending a form with javascript. Either you can reformat the data before it's sent. Thereby creating an email that is legible upon receiving it. Or you can reformat the data after you receive the email. I have posted both methods on this page.
Option 1: REFORMAT AFTER
Create your form using the following syntax:
<form name="NameOfYourForm" method="post" action="mailto:yourname@yourdomain.com">
<!-- your input tags go here -->
<input type="submit" value="Send">
</form>
Then download the attachment to this post. Open the file in your web browser. When you receive the email containing the form data, just select it all and copy it. Then paste the data into the "hexadecimal value" box. Click decode to convert it to ascii. Then click split to remove +'s and to split data onto multiple lines. Use the "add html" checkbox to make the output viewable in your web browser.
NOTE:
The first input tag that you use in your form will become the <title> if you use the html option. So if your first input tag is name="Name" value="Joe Smith" then the html title will appear as <title>Name: Joe Smith</title>.
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Oct 11, 2010
I am using Ajax to send a large text box to a server script, however, when the textbox has a lot of data it fails. Is there a better way for me to do this? Here is my code.
Code:
<script type="text/javascript">
function testmail()
{
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
[Code]...
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Aug 25, 2009
html > input field > customer types in field > as customer types in field jquery send what is typed and the field id to a php file > php store value as session variable
now i know how to store the php variable i just dont know how to get JQuery to send the input id and the value to the php file
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Apr 27, 2010
I'm working on a very Javascript heavy application, and we've set up a number of different Objects to handle the data on the page. Very often, we'll need to send all of the data from these objects to PHP. Right now, we're using JSON.stringify. Are there any issues with this? It seem's like it does exactly what we need, but are there any downsides?
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