Ajax :: Sends Multiple Requests
Aug 19, 2011
I have a jsp page using ajax that has a button with an action. The action sends multiple ajax requests. The response from these requests is to be used to update a progress indicator to show the servers current progress. I can see from the debug that I am getting the 1st response. I think it is the way how I have implemented the further requests. I think this is down to my javascript knowledge, which isnt very much. Also I assume using multiple requests in this way is the correct thing to do? I have spent ages trawling the internet trying to get a solution.
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May 15, 2011
This might seem like a silly question..First issue. If i have a response and i'd like to update both text div and a status div how would i go about doing this. I've seen that jQuery has a few options such as OnSuccess etc?
Say that i post a comment and obviously you'd want to update some kinda statusbar on your website with the info that the message was posted successfully with ajax. (otherwise it might slip by the user unnoticed since ajax is kinda discrete)
Would it be a good way to for instance check the responseText if it contains anything and if it does you simply write a successmessage by grabbing a div from JS and if the responseText contains a custom error code lets say 1 you'll update the statusbar with a deny message?
Second thing. I've currently created an Ajax search on my site which activates whenever the user press or unleash the button. The issue is that if the user types fast enough it comes stuck showing the Loading.gif constantly. Could this be due so many requests opening and that i have a sleep on the server-side and if so how would you do it instead? I am using a serversleep of 1 second to have the Ajax pic appear consistently.
[Code]...
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Apr 18, 2011
I'm encountering an AJAX problem when I try to execute multiple AJAX requests at the same time. What I want to do is delete a message and display the status (succes or failure) of that in div1, and refresh the messages on the page in div2. This needs (for as far as my knowledge reaches) two AJAX actions from which I both need the responseText.
The problem:
What happens when I execute my script is that the second action (refresh a part of the page) happens before the deletion is executed. The result of this is that when the deletion has been executed, the page is already updated, and the deleted message is still there.
The script
What I now have is:
function doAjax(url, element_id, img_url){
var ajaxObject = createAjaxObject();
ajaxObject.open('GET', url, true);
ajaxObject.onreadystatechange = function(){
if(ajaxObject.readyState==4 && ajaxObject.status==200){
document.getElementById(element_id).innerHTML = ajaxObject.responseText;
delete ajaxObject; .....
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Mar 18, 2009
I need to send 15 requests to my server and get results, these results are queries to other sites. I then update my page with the results. I need to know if I am taking the correct approach, as things are working a bit slow, and i.e., seems the be as slow as a snail.
Here is my function for the first request
Code:
function one(){
var xmlHttpa=null;
try{
xmlHttpa=new XMLHttpRequest();
} catch (e){
try {
xmlHttpa=new ActiveXObject("Msxml2.XMLHTTP");
} catch (e){
try {
xmlHttpa=new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
alert("Your browser does not support AJAX!");
return false;
}}}
xmlHttpa.onreadystatechange=function(){
if(xmlHttpa.readyState==4){
document.getElementById('resulta').innerHTML = xmlHttpa.responseText;
var el = document.getElementById('showMessagea');
el.parentNode.removeChild(el);
applystyle();
}}
xmlHttpa.open("GET","one.php",true);
xmlHttpa.send(null);
}
I then call this function and others from my page, one(); two(); etc. Am I correct in my approach?
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May 11, 2011
I have a page that relies on AJAX for content manipulation. Once a person selects a radio button, a request is made through $.getJSON() to get the replacement content. This works in all browsers. Once the new content is loaded, there are 3 more calls to $.getJSON() to change more content (on other tabs in jQuery UI). This works in all browsers except for IE.
I understand this is a Microsoft problem, and not a jQuery problem, but I am wondering if there is a way to manipulate the jQuery calls to get them to work in IE. I did try replacing $.getJSON with $.ajax, and even set async to false. None of those three methods worked in IE. I noticed the problem when my loading div was still displayed in IE. Using Firebug Lite, I saw that only one request was made, rather than four.
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May 6, 2010
I have a problem where if a form submission (set up to submit via AJAX) fails validation, the next time the form is submitted, it doubles the number of post requests - which is definitely not what I want to happen. I'm using the jQuery ValidationEngine plugin to submit forms and bind validation messages to my fields. This is my code below. I think my problem is that I need to unbind from the validationEngine plugin when the form fails, but I can't figure out how to do this.
[Code]...
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Feb 9, 2009
I'm using AIR to write an application that is mostly javascript (I am using jquery for quite a lot of it). The program has to be able to download multiple HTML pages (like a RSS feed reader might) and take a specific action when the download is complete, depending on which page has just downloaded. I'm using air.URLLoader with an eventlistener to notify when the page download is complete. The problem I have is that I want to run through a database table of around 20-30 URLs and dynamically create URLLoaders for each.I've spent hours searching Google and looking for ways to overload the event listener, add a property to the URLLoader object etc but all to no avail.
The code above will load whatever pages it is told to, but the problem I have is that it needs to take different actions depending on which page is loading. Each page in the database table has an ID field and I need to somehow identify the ID of the page within the notifyURLComplete function, hence the reason I'd like to pass the page ID into the event listener (apparently not possible) or add an additional property to the URLLoader object.Another possibility was a custom event handler, but I'm not sure how/where this would be done in my code.
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Oct 14, 2006
I have an web application (PHP backend) where I want to initiate multiple requests to the same server (to different php functions/files) and asynchronously update the response on the page (the call back function is same for all the requests).
What is the best solution for this ? Is it better to
a) call multiple server calls from the java script file? if so Do we create multiple http objects ? can someone point me to the few examples ?
b) call one Php service and have the php fork the multiple requests on the server side. I am not sure if this can be done multiple requests be done asynchronously on the server side ? and if so how to dynamically update teh resultant page as each request finishes?
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May 14, 2009
It looks like IE is caching the response for some AJAX requests here. The app I'm working on is a catalog of sorts. Clicking the link for a category loads a set of "items". Those, in turn, may be deleted from the admin view. The delete works fine (I checked the DB) but, when loading the same set of category items, I'm seeing the list unchanged. That is, the thing that was deleted is still there. Sorry for the crap explanation but I'm not really sure of a better way of putting it. Bottom line is, has anyone seen this sort of behavior with IE before? Can it cache the result of an AJAX request like that? And, if so, how can I guard against that? Can I set cache-control headers for an AJAX request?
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Jan 12, 2009
I have this function among many that houses forms. I'm also using an ajax page that is supposed to deal with form's entries and insert everything into my DB and I don't know how to separate the different requests on the ajax page so that it can do what the correct request is.
[Code]...
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Apr 29, 2009
Very intermittently, I am finding ajax requests submitted with jquery are being submitted twice, once with parameters, and once without parameters. The code looks something like this:
[Code]...
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Feb 12, 2010
I'm trying to launch two ajax requests at same time. I'm expecting result from the first later than the second. The problem is, it won't return me any result from the second request untill first one is returned.
Check it out :
$.post("sendMail.php");
getSendInfo();
setTimeout(getSendInfo,5000);
[code]....
I'm getting response from the $.getJSON function only when the $.post is over. Is this a bug or a mistake from me ? My aim is to launch a long request and fire multiple other requests to check how is doing the first one.
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Jul 12, 2011
I need to encrypt my AJAX requests and responses from the server. As the message format I use simple JSON.Can you advise any libraries about it?
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Oct 25, 2010
I'm having problems performing a simple load(...) request to bring in HTML content from a partner Oracle system within the same domain. Our portal has a built-in SO connection will handles security for me transparently. However during the process it initiates a 302 temporarily moved response which seems to trip up an AJAX request, but doesn't trip up Firefox when accessed through the address bar. If I use the same URL in an IFRAME it's totally fine.
After tons of googling, searching the forums, and the bug tracker database I cannot find anyone who has experienced this problem. Before I open a bug ticket I'd like community feedback to help me see if I am doing anything wrong.
My AJAX call looks like this in Javascript:
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Mar 26, 2010
I have a element when click, it will trigger some other elements to be selected. and those elements will trigger elements in next level.
It is a three levels hierarchy so to speak. but each element will send an ajax request when selected. Those requests will become out of control especially when I repeatedly click the root element.
Can I queue those XHR request in a queue and send them one by one? or maybe add a delay before send so that they can collect their information into one batch request and send one request after that.
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Jul 23, 2010
I am developing a fairly complicated application with a lot of JavaScript and making use of JQuery. The application repeatedly makes simultaneous GET requests.
I am looking for a way of assigning a unique token to each request when it is made, so that I can store information about that request and cache the request / response combo, when using $.get() (or potentially $.ajax() if required for the extra functionality).
So far I have not had any joy and after a while googling this am none the wiser. I have used similar functionality in Flex 3 with the AsyncToken object which can maintain data between HTTP request / response.
[Code]...
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Jan 29, 2011
I'm working on a php/jQuery application, I want to display a loading image automatically every ajax request, without writing code for every ajax request. Is there anyway to do this.
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Oct 3, 2011
When a pending ajax request is aborted in IE browsers there is a new global object called "jQuery" + timestamp, for example "jQuery16405272192696596443".
This happens in every IE from 6 to 9 but not in Chrome, Safari, FireFox in their current stable versions. I am a bit lost and found nothing similar. I created a little test page to determine whether it started due to some own code or just in this little piece.
Example HTML:
<!DOCTYPE html>
<html>
<head>
[Code].....
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Sep 25, 2009
I use $.post like so: $.post("http://mydomain.com/some/webservice", $.toJSON({ emailAddress: emailAddress }), callback, "json"); this works great..the response of the POST is a json string and that is used in the callback..now I added https: $.post("https://mydomain.com/some/webservice", $.toJSON ({ emailAddress: emailAddress }), callback, "json"); so it is now a cross domain post...in firebug I see that instead of POST'ing like in the http case..it first is sending an OPTIONS verb..why? The webservice doesn't know how to respond to that and gives a 403 forbidden...I need it to just send the POST like it did when it was on the same domain...
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Jun 10, 2010
Looking to parse the XML file a perl script sends back.I wantto get values from specific tags in the XML file. Here is my code:
[Code]...
The code seems to be getting hung up on the dataType: "xml", line because when I comment it out, it goes to the next step and executes the function (although it doesn't do anything). how I can change this or just take a different approach? Let me know if I can provide more information.
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Jul 28, 2010
I am using ajaxSubmit from the jquery.form plugin for a file upload. Obviously my form contains a file input element, and therefore it needs to be submitted to an iframe and have its response read from the iframe (since xhr won't work with a file input). This is built into the jquery.form plugin and is working fine in firefox. However, when I submit my upload with IE, it is still acting like the form was submitted to the main page -- not the iframe. The response is just some JSON string indicating the results of the file upload.
In firefox, the upload runs, the json response comes back to the iframe, and then the callback reads the response from the iframe and updates the page. In IE, the upload runs and then the json response comes back to the main page as a text file...so IE pops up a window asking me if I want to download or open the file. Does anyone know why my JSON response is coming back to the main page and not the iframe?
Here is some of the code. The only semi-funky thing that goes on here is that the form is not set with a multipart encoding originally. This is because the main page's form submit should not be multipart. I set the form as multipart right before the fileUpload, and then before the main form is saved I reset the encoding. As far as I can tell this part is working, though...since the file is uploading no, problem; it's just the response that isn't being read correctly (or directed correctly?)
Here is a code snippet from the code that runs when the upload button is clicked.
// set the encoding to multipart. I've heard IE can be wonky, so it's set in two ways.
form.setAttribute('encoding', 'multipart/form-data');
form.setAttribute('enctype', 'multipart/form-data');
[Code]....
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Oct 7, 2009
I'm using the AutoComplete Plugin with ASP.NET MVC For some reasonthe client side input value is NULL when it reaches the Server method.
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Feb 8, 2010
I am working on a javascript code for validating phone numbers against 0's.The scenario is that, 1 ) If the phone number contains all 0's in it, an error message is displayed. Eg. 0, 0000, 000-000-0000, 000,0000000000 etc..2 ) Phone number should only take digits [0-9] and some delimiters ()-,.+ "All other alphabets and special characters are not allowed.Eg. 01, 102-125-0214, etc.. ( allowed ) sjjlkjkj, xllfs -09-49- ( not allowed )3 ) The code I have written is as below -
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
[code].....
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Sep 25, 2011
I made a request to db via jQuery.post(). Generally it works as it should, but if I use german special characters, they are treated wrongly. For closer examinations, I set up a new file without db-access, only displaying regular and special chars. I checked the characters after reading the value of text-input by alerting it. At this moment, it is correct! The issue happens when jQuery gives the variables to POST (its the same with GET). The target-file can read only wrong characters from POST. I crosschecked it by submitting data by a standard form. Now, the POST is read correctly. Special chars, which are echoed explicitly (not questioned by POST) are given back correcty
- I defined charset it in html header and tried other charsets - always the same.
- Adding the accept-tag to inputbox didn't help.
- Redefining charset in target-file didn't help.
- Adding the charset-tag to the jQuery including script didn't help.
So, I think, the code is correct but there is an issue with the charset. And it is definitley at this moment, when transfering the variable to the POST.
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Jul 23, 2005
how do I know when the browser is making a request to the server? I am
not having an onclick event for EVERY hyperlink, submit, etc. There
must be some javascript function that I can overwrite that will allow
me to do something when the browser requests something from the server.
My plan is whenever a browser is about to request something from the
server to create a time stamp and then compare this time to the time
when the page returns from the server. This will allow me to measure
performance.
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Feb 14, 2006
Say I wrote an ajax script to send out HTTP requests via ajax. Any
cookies that I have associated with that site will be sent along with
this HTTP request. Is there a way to prevent this from happening? I
tried the following to no avail:
http.setRequestHeader('Cookie','');
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