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  • jsp chatting with ajax

    - by paramesh
    Hi sirs, I am writing one web chat program using AJAX (a little bit). It is working when both users open a chat page, but I want to open a window when one user send data to others.

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  • Managing multiple AJAX calls to PHP scripts

    - by relativelycoded
    I have a set of 5 HTML dropdowns that act as filters for narrowing results returned from a mySQL database. The three pertinent filters are for "Province", "Region", and "City" selection, respectively. I have three functions: findSchools(), which runs when any of the filters (marked with CSS class .filter) are changed, and fetches the results via AJAX from a PHP script. Once that is done, two other functions are called... changeRegionOptions(), which, upon changing the "Province" filter, and updates the available options using the same method as the first function, but posting to a different script. changeCityOptions(), which runs if the "Region" filter was changed, and updates options, again using the same method. The problem is that since I want these AJAX functions to run simultaneously, and they by nature run asynchronously, I've tried using $.when to control the execution of the functions, but it doesn't fix the problem. The functions run, but the Region and City filters return blank (no options); the FireBug report shows absolutely no output, even though the POST request went through. The posted parameter for filter_province gets sent normally, but the one for region gets cut off at the end -- it sends as filter_region=, with no value passed. So I'm presuming my logic is wrong somewhere. The code is below: // When any of the filters are changed, let's query the database... $("select.filter").change(function() { findSchools(); }); // First, we see if there are any results... function findSchools() { var sch_province = document.filterform.filter_province.value; var sch_region = document.filterform.filter_region.value; var sch_city = document.filterform.filter_city.value; var sch_cat = document.filterform.filter_category.value; var sch_type = document.filterform.filter_type.value; $.post("fetch_results.php", { filter_province : sch_province, filter_region : sch_region, filter_city : sch_city, filter_category : sch_cat, filter_type : sch_type }, function(data) { $("#results").html(""); $("#results").hide(); $("#results").html(data); $("#results").fadeIn(600); } ); // Once the results are fetched, we want to see if the filter they changed was the one for Province, and if so, update the Region and City options to match that selection... $("#filter_province").change(function() { $.when(findSchools()) .done(changeRegionOptions()); $.when(changeRegionOptions()) .done(changeCityOptions()); }); }; This is just one of the ways I've tried to solve it; I've tried using an IF statement, and tried calling the functions directly inside the general select.filter.change() function (after findSchools(); ), but they all return the same result. Any help with this would be great!

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  • Modifying jQuery ajax request Connection header

    - by Pat
    I'm trying to modify the Connection header with the following code with no success jQuery.ajax({ url: URL, async: boolVariable, beforeSend: function(xhr) { xhr.setRequestHeader("Connection", "close"); } }) The request headers via Firebug show: Connection keep-alive X-Requested-With XMLHttpRequest Any odd bugs/problems with setting this particular header known? Or is there something I'm doing wrong?

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  • How to use the Value of a Selected Value from a DropDownList populated with AJAX/PHP

    - by mouthpiec
    Hi, I have form with two dropdownlists (lets say A and B). When I select a value from A, B is being populated accordingly using AJAX In the same page I have a button, that when pressed, posts the values of the selected items of the dropdownlists to another PHP page. The problem I am having is that the selected value of B is returned as Blank/Empty. Is there a way to store the selected value of a dropdownlist populated using AJAX? Code below: (Main FORM) <form name="NewBar" method="post" onsubmit="return validateFormOnSubmit(this)" action="AssignContactDetailToBar_f.php"> <tr> <td width="150"><b>Bar:</b></td> <td> <select name = "bar" onChange="getContact('AssignContactDetailToBar_f_getContacts.php?bar='+this.value)" size = 1 style = "width:190px"> <option value = "">---Select---</option> <?php while ($data = mysql_fetch_array($r_getBarsDetails)) { echo "<option value=\"".$data['bar_id']."\">".$data['bar_name']." (".$data['town_name'].")</option>"; } ?> </td> </tr> <tr> <td width="150"><b>Contact Person:</b></td> <td> <div id="persondiv"><select name = "person" size = 1 style = "width:190px"> <option value = "">--Select Bar--</option> </td> </tr> <tr> <td> <input name="security" type="text" size="15"> </td> <td> <input type="submit" name="Submit" value="Submit"> </td> </tr> </form> FORM to populate the 2nd Dropdownlist <select name="person" size = 1 style = "width:190px"> <option value = "">--Select Person--</option> <?php while($data=mysql_fetch_array($result)) { echo "<option value=\"".$data['person_id']."\">".$data['person_name']." ".$data['person_surname']." (".$data['town_name'].")</option>"; } ?> if you would like to see the complete code download from here

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  • ASP.NET MVC 2 AJAX dilemma: Lose Models concept or create unmanageable JavaScript

    - by Slightly Frustrated
    Hi, Ok, let's assume we are working with ASP.NET MVC 2 (latest and greatest preview) and we want to create AJAX user interface with jQuery. So what are our real options here? Option 1 - Pass Json from the Controller to the view, and then the view submits Json back to the controller. This means (in the order given): User opens some View (let's say - /Invoices/January) which has to visualize a list of data (e.g. <IEnumerable<X.Y.Z.Models.Invoice>>) Controller retrieves the Model from the repository (assuming we are using repository pattern). Controller creates a new instance of a class which we will serialize to Json. The reasaon we do this, is because the model may not be serializable (circular reference ftl) Controller populates the soon-to-be-serialized class with data Controller serializes the class to Json and passes it the view. User does some change and submits the 'form' The View submits back Json to the controller The Controller now must 'manually' validate the input, because the Json passed does not bind to a Model See, if our View is communicating to the controller via Json, we lose the Model validation, which IMHO is incredible disadvantage. In this case, forget about data annotations and stuff. Option 2 - Ok, the alternative of the first approach is to pass the Models to the Views, which is the default behavior in the template when you start a new project. We pass a strong typed model to the view The view renders the appropriate html and javascript, sticking to the model property names. This is important! The user submits the form. If we stick to the model names, when we .serialize() the form and submit it to the controller it will map to a model. There is no Json mapping. The submitted form directly binds to a strongly typed model, hence, we can use the model validation. E.g. we keep the business logic where it should be. Problem with this approach is, if we refactor some of the Models (change property names, types, etc), the javascript we wrote would become invalid. We will have to manually refactor the scripting and hope we don't miss something. There is no way you can test it either. Ok, the question is - how to write an AJAX front end, which keeps the business logic validation in the model (e.g. controller passes and receives a Model type), but in the same time doesn't screw up the javascript and html when we refactor the model?

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  • Ajax PageMethods troubles

    - by Tony
    Hi http://stackoverflow.com/questions/2709245/ajax-without-updatepanel/2709262#2709262 I tried to use these methodologies to remove UpdatePanel from application, I have a page with search keyword which call the PageMethods and I load the user control manually and render it then place rendering output to the page, but something strange happen, while search results is 100 and there is DataPager in the user control, the data pager did not appear, and also only one element appear, it looks that ItemTemplate did not resolve more than once. What is chances ??

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  • jquery, get url segment - ajax

    - by mike
    Hello! Say I have a list of items from a database. Next to each item there is a delete link. the links look something like: http://example.com/exp/delete/1 - 1 is the ID of the record I want to delete. How can I grab the ID to pass through AJAX? Thanks

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  • Javascript AJAX function returns undefined instead of true / false

    - by Josh K
    I have a function that issues an AJAX call (via jQuery). In the complete section I have a function that says: complete: function(XMLHttpRequest, textStatus) { if(textStatus == "success") { return(true); } else { return(false); } } However, if I call this like so: if(callajax()) { // Do something } else { // Something else } The first is never called. If I put an alert(textStatus) in the complete function I get true, but not before that function returns undefined.

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  • AJAX, Subdomains and the 200 OK response.

    - by b. e. hollenbeck
    A non-hypothetical but abstracted situation: I have a domain www.foo.com, from which I'm making an AJAX POST to beta.foo.com. Examining the XHR object, I see a response header of 200 OK, but no response text - I even get a response 12B long, which is the exact response (a 12-character string) that I'm expecting - but the response text is blank. If this is a cross-domain issue, why am I getting 200 OK, and better yet - why am I seeing the PHP functions fire on the beta.foo.com side - yet getting no response?

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  • jQuery AJAX requests with Rails 3

    - by elsurudo
    I'm trying to do a manual jQuery AJAX request the following way: $("#user_plan_id").change(function() { $("#plan_container").load('/plans/' + this.value); }); I have the "rails.js" file included in my header, and a "<%= csrf_meta_tag %". I see from my log that the request IS getting to the server (although without the authenticity token... does rails.js even do this?), but the response is a 302 (Found) rather than 200, and no data actually gets rendered. Any ideas?

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  • Javascript: achieving the Google Ad AJAX effect

    - by johnnietheblack
    I need to create a portable script to give to others to implement on their websites that will dynamically show content from my database (MySQL). I know AJAX has a cross-site problem, but it seems that Google's ad's somehow manage the effect in a cross-browser / cross-site fashion. Knowing that I have to give people a simple cut/paste snippet to put in their website...how can I achieve this? How did Google?

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  • mySQL - One large query vs Ajax indivdual queries

    - by Mark
    Hi guys, I guess no one will have a definative answer to this but considered predictions would be appriciated. I am in the process of developing a mySQL database for a web application and my question is: Is it more efficient to make a single query that returns a single row using AJAX or To request 100 - 700 rows when the user will likely only ever use the results of two or three? Really I am asking what is heavier for the server 2-3 requests with one result or 1 request with 100 - 700 results? Thanks, Mark

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  • Desiging a AJAX website

    - by Narmatha Balasundaram
    What are the things to consider and watch out for when designing a website with AJAX? Must take care of conditions, say timeouts, error handling, for instance? Best practices? What parameters to take care of while designing and coding?

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  • Caching ASP.NET AJAX service javascript proxies

    - by Stephen Newman
    We have a number of small but useful WCF services which are being hosted using the WebScriptServiceHostFactory class and consumed via ASP.NET AJAX. We've noticed that in our production environment that the javascript proxies are not being cached by the client. Is there anyway to allow these files to be cached?

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  • JQuery username validation - Ajax call

    - by Denise
    Hi, I am currently using JQuery's validation plugin for basic form validation such as required fields. I want to add functionality so that when the user types in the username field, an ajax call is triggered to check whether the username is already taken. My requirements are: Preferably integrate with JQuery Validation plugin, rather than writing a custom function I want the lookup to occur on the nkeyup event I want the lookup to be triggered approx 0.5 seconds after the keyup event has occurred. Thanks!

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