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• Grails/Spring HttpServletRequest synchronization

  - by Jeff Storey

  I was writing a simple Grails app and I have a spot in a gsp where one of my java beans in modified. <g:each in="${myList}" status="i" var="myVar"> // if the user performs some view action, update one of the myVar elements </g:each> This works, but I don't think it's quite threadsafe. myList is an http request variable but in cases of pages that use ajax (or other client side manipulations), it is possible for two threads to be modifying the same request scope variable The Spring AbstractController class provides a setSynchronizeOnSession method. Does grails provide any equivalent functionality? If not, what's the best way to protect this non-threadsafe mutation? thanks, Jeff

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• Rails and image gallery: how to make it flexible?

  - by user305270

  Hy! In my app, every profile has a gallery and this gallery has images. They can have 1 or 1000 images, so when i show up the gallery i only need a part of the images, let's say 12 images. Then in my ajax gallery when, someone requests more images are loaded. This gallery is SEO, so, the main url is: "/profile-url/" and then, there are these urls too: "/profile-url/images/1" that loads the image with the id=1 in the database. The gallery have to show only 6 images per stack, so When i request the page with the image.id=64, only have to show from 60 to 72, and to select the 64, that is done with js. how may i add a request like this? and how to order them? thanks

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• Compressing plaintext in JavaScript?

  - by AgileMeansDoAsLittleAsPossible

  I have a simple Notepad-like web application I'm making for fun. When you save a document, the contents of a <textarea> are sent to the server via Ajax and persisted in a database. Let's just say for shits and giggles that we need to compress the contents of the <textarea> before sending it because we're on a 2800 baud modem. Are there JavaScript libraries to do this? How well does plain text compress in the first place?

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• how to set(get) cookie value in ext.net

  - by user591587

  scene: when I click item in ext:ComboBox and want to set the item selected value to cookie variable. Finally, after I click ext:Button, the ext:Label get cookie value and display it. But I get a error :Ext.Ajax Communication Failure , any help will be appreciated. aspx: <ext:ComboBox ID="ComboBox1" runat="server" StoreID="Store1" Width="100" Editable="false" DisplayField="name" ValueField="value" Mode="Local" TriggerAction="All`enter code here`" EmptyText="Select a locale..."> ..... aspx.cs protected void lngIndexChanged(object sender, DirectEventArgs e) { //Sets the cookie that is to be used by Global.asax HttpCookie cookie = new HttpCookie("CultureInfo"); cookie.Value = ComboBox1.SelectedItem.Value ; Response.Cookies.Add(cookie); Label1.Text = cookie.Value; //Set the culture and reload for immediate effect. //Future effects are handled by Global.asax Thread.CurrentThread.CurrentCulture = new CultureInfo(ComboBox1.SelectedItem.Value); Thread.CurrentThread.CurrentUICulture = new CultureInfo(ComboBox1.SelectedItem.Value); }

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• Tapestry 4, get submitted value from non-component element

  - by cometta

  My form has a custom element like below, created using custom ajax: <select jwcid="testtest <at> Any"> <option value="x">California -- CA</option> <option value="y">Colorado -- CO</option> <option value="z">Connecticut -- CN</option> </select> After the form is submitted, how do I get the value of this custom html element? cycle.getPage().getComponents().get("testtest") ?

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• jQuery Mobile ScrollView "initialization"

  - by Fabio B.

  I'm using the scrollview experimental feature of jQuery Mobile: <div class="carousel" data-scroll="xp"> ... my position:absolute very large div ... </div> as described here: http://jquerymobile.com/test/experiments/scrollview/ Now I need to change the ".carousel" content dynamically: I make an ajax call in order to retrieve my new scrollview content. The content loads and shows in my div correctly, but it's not scrollable anymore! How can I rebind my "carousel" to its scrolling original behavior? Does a ".scrollview()" function actually exist? Thank you

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• Dynamically removing records when certain columns = 0; data cleansing

  - by cdburgess

  I have a simple card table: CREATE TABLE `users_individual_cards` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` char(36) NOT NULL, `individual_card_id` int(11) NOT NULL, `own` int(10) unsigned NOT NULL, `want` int(10) unsigned NOT NULL, `trade` int(10) unsigned NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY `user_id` (`user_id`,`individual_card_id`), KEY `user_id_2` (`user_id`), KEY `individual_card_id` (`individual_card_id`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1; I have ajax to add and remove the records based on OWN, WANT, and TRADE. However, if the user removes all of the OWN, WANT, and TRADE cards, they go to zero but it will leave the record in the database. I would prefer to have the record removed. Is checking after each "update" to see if all the columns = 0 the only way to do this? Or can I set a conditional trigger with something like: //psuedo sql AFTER update IF (OWN = 0, WANT = 0, TRADE = 0) DELETE What is the best way to do this? Can you help with the syntax?

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• Selenium fails to find component after dom update (reRender)

  - by Bozho

  I'm testing a richfaces application with selenium. It works fine, unless I use reRender. (for those unfamiliar with richfaces - whenever an ajax request finished, parts of the DOM are updated/chagned/removed). So, after a reRender selenium (the IDE at least) fails to locate the elements which were within the reRendered area. Both FireBug and WebDeveloper locate the elements, and on "view source" the elements are there. So, is there a way to tell selenium to update its DOM "knowledge" with the latest changes? Firefox 3.5.6, latest version of Selenium IDE.

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• PHP upload with progress bar

  - by Mitchan Adams

  Hi all I want to create an upload form to upload large files. Thats pretty much easy, however, the upload process itself taks long and basically looks like nothing is happening for a few minutes. So now I'd like to insert a progress bar to show the user that something is happening and they should just sit tight. I've read of numerous methods like APC and certian flash plugins, but my site is hosted on a shared server and I cant install any new applications on it. I'm thinking, maybe if it is possible to read the size of the temp file it creates via an ajax page. By polling the size every few seconds I should be able to get the progress of the upload. Now the question I pose is...where is the temp file situated?

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• Scriptaculous Autocomplete to activate when the page is loaded.

  - by Jelle

  Is there a way to fire up Scriptaculous's Autocomplete to search with the default word from the inputfield when the page is loaded? Something like this? <input type="text" id="autocomplete" class="autocomplete_input" name="autocomplete_parameter" value="friends"/> <span id="indicator1" style="display: none"> loading </span> <div id="autocomplete_choices" class="autocomplete"> </div> <script type="text/javascript"> function AutoComp() { var myAutoCompleter = new Ajax.Autocompleter("autocomplete", "autocomplete_choices", "url", {indicator: 'indicator1',}); } document.onLoad = AutoComp.activate(); </script>

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• Extjs - Getting more from the server

  - by fatnjazzy

  Hi, Is it possible to get every data from the server? for example, i want to get the columns items from the server Via Ajax/Proxy by sending json string? thanks var grid = new Ext.grid.GridPanel({ store: store, columns: [ {id:'company',header: 'Company', width: 160, sortable: true, dataIndex: 'company'}, {header: 'Price', width: 75, sortable: true, renderer: 'usMoney', dataIndex: 'price'}, {header: 'Change', width: 75, sortable: true, renderer: change, dataIndex: 'change'}, {header: '% Change', width: 75, sortable: true, renderer: pctChange, dataIndex: 'pctChange'}, {header: 'Last Updated', width: 85, sortable: true, renderer: Ext.util.Format.dateRenderer('m/d/Y'), dataIndex: 'lastChange'} ], stripeRows: true, autoExpandColumn: 'company', height: 350, width: 600, title: 'Array Grid', stateful: true, stateId: 'grid' });

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• Client-side or server-side processing?

  - by Nick

  So, I'm new to dynamic web design (my sites have been mostly static with some PHP), and I'm trying to learn the latest technologies in web development (which seems to be AJAX), and I was wondering, if you're transferring a lot of data, is it better to construct the page on the server and "push" it to the user, or is it better to "pull" the data needed and create the HTML around it on the clientside using JavaScript? More specifically, I'm using CodeIgniter as my PHP framework, and jQuery for JavaScript, and if I wanted to display a table of data to the user (dynamically), would it be better to format the HTML using CodeIgniter (create the tables, add CSS classes to elements, etc..), or would it be better to just serve the raw data using JSON and then build it into a table with jQuery? My intuition says to do it clientside, as it would save bandwidth and the page would probably load quicker with the new JavaScript optimizations all these browsers have now, however, then the site would break for someone not using JavaScript... Thanks for the help

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• Recommendations or advice for shared computer control

  - by Telemachus

  Basic scenario: we are a school (overwhelmingly Mac, some Windows machines via BootCamp), and we are considering using DeepFreeze to guard the state of our shared machines. We have roughly 250 machines that are either shared laptops (which move around quite a bit) or common desktops in public spaces. Obviously, we spend a lot of time maintaining the machines and trying to reverse the inevitable drift as people make changes to the computers. We would like to control the integrity of the build we initially put onto the machines without handcuffing users and especially without using Mac's Parental Control software. (We've had nothing but bad experiences with it.) We've been testing DeepFreeze, and so far it's very impressive. But I'm curious to hear if people who have used DeepFreeze or any similar software have any advice or tips. To get things started, I will post my own pros and cons. Pros: The state of the machine is frozen in our chosen state. All changes made to the machine after that disappear upon restart. (This frozen state really appears to cover everything. I have yet to do something to a test machine that isn't instantly healed.) Tons of trivial but time-consuming maintenance is gone in an instant. Also, lots of not-so-trivial breakage should be avoided. There are good options, however, that allow you to create storage spaces either globally or per user. (Otherwise, stored files disappear upon reboot. For some machines, this is a good option itself. Simply warn people: save externally or else; this machine is a kiosk, not your storage space.) Cons: Anytime we actually need to make a change (upgrade basic software, add a printer or an airport permanently, add new software), the process is a bit more complex. Reboot into a special mode (thaw state), make changes, reboot back into frozen mode. If (when?) we forget this, we will end up making changes that disappear after the next reboot. Users will forget to save files correctly (in the right place or externally), and we will have loud, unpleasant conversations explaining that we can't recover the document they worked on all afternoon yesterday. The machine rebooted. The file is gone. These are my initial thoughts, but I would love to hear from other people who have experience with DeepFreeze or any similar software. What should we be careful about? Do the pros outweigh the cons? What gains or problems am I not seeing? Thanks.

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• Use javascript variables in Rails view helpers

  - by Horacio

  Using jqGrid I want to generate delete links for each row in the grid. The standard way to do this is to add the links in the gridComplete callback like shown below: gridComplete: function() { var ids = jQuery("#jobs_table").jqGrid('getDataIDs'); for(var i=0;i < ids.length;i++){ var cl = ids[i]; be = '<%= link_to(image_tag("delete.gif", :border=>0, :size=>"20x22", :alt => "delete"),· { :action => 'destroy', :id => 'cl', :method => :delete}, :class => 'ajax') -%>'; jQuery("#jobs_table").jqGrid('setRowData',ids[i],{workflow_state:be}); } }, Using getDataIDs I get a list of IDs that I can use to generate the delete links. The problem is that this is a javascript call that results in a javascript variable. The question is how can I use this variable "cl" inside rails link_to view helper?

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• wpf legacy server call

  - by Shah Al

  Hi, We have a legacy application running tomcat that publishes data in a simple html table. I have no control on the remote server publishing the data. I am looking to extract the data into a WPF desktop application and display it as a table. Is there any way a WPF application can make a url call, get the result and parse the data. This would be similar to AJAX from JSP. Any thoughts/ideas? Please advice. Regards,

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• Transient network dropout for Xen DomU's

  - by Stephen C

  We've got a CentOS server running a cluster of virtuals. Occasionally the cluster's internal network drops out for a minute or so ... and then comes back. The problem is somehow related to the actual network traffic, but it is not a simple load issue. (The system is generally lightly loaded, and the problem occurs irrespective of actual load.) The setup: CentOS 5.6 on Dom0, various CentOS on the DomU's Hardware - a Dell R710 with a BroadCom NextXpress 2 NIC (sigh) using the latest drivers for the NIC from BroadCom Xen configured to use network-bridge and vif-bridge Some iptable tweaks to route an unrelated port to one of the virtuals. The system has one externally visible IP address, and Dom0 runs an Apache httpd configured with a number of virtual hosts each of which reverse proxies to web servers running on the virtuals. (The virtuals have to be NAT'ed, primarily because we don't have enough allocated public IP addresses.) The symptoms: Works fine most of the time. When someone tries to UPLOAD a large file to one virtuals, the internal network drops out ... for all virtuals: The Dom0 httpd sees a network timeout talking to the backend server on the virtual and reports a 502. A previously established ssh connection from Dom0 to any of the DomU's freezes. Our monitoring shows ping failures for traffic between virtuals. The Xen consoles to the DomU's do not freeze. No log messages in any log files that I can see, on either Dom0 or the DomU's ... apart from the Dom0 httpd logs. After a minute or so, the problem clears by itself. This is 100% reproducible. What we've tried: Downloading, building and installing the latest BNX2 driver on Dom0 Turning off MSI on the NIC - adding "options bnx2 disable_msi=1" to /etc/modprobe.conf Turning off tcp segmentation offload - "ethtool -K eth0 tso off". Sacrificing a black rooster at midnight. I've exhausted all my options apart from switching to KVM ... or slaughtering more roosters. Any suggestions?

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• Scrollable display of multiple video icons

  - by Tam

  Hello, I want to have multiple video icons at the top my website's front page. I will have about 20 or so which won't fit on one line (I want to keep the videos on one like) so I thought of having two button on the right of the group and on the left of the group where you click to scroll and view more videos. Do you know an easy way to do this? I can pass in the video links from the server in different Divs or anyway that will make it easy. I thought of using AJAX and pass it different set every time from the server with every click (I'm using Rails and it's fairly easy to do it) but that will be an extra load on the server which I'm trying to avoid. I'd rather send all the icons at once and let the JavaScript handle the scrolling. I thought of using iFrame but I don't like the idea of scrollbar and wanted to be more like button Any ideas? Thanks, Tam

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• Is there equivalences between Microsoft and Oracle/Sun technologies?

  - by Junior Mayhé

  Hello is it possible to say what are the Microsoft equivalents technologies compared to Sun? For example: Microsoft | Sun --------------------------------------------------------------- Visual Studio | Eclipse? IIS | Apache? ASP.NET | JSP, JSF ? SQL Server | Java DB ? ADO.NET Entity Data Model | ??? ASP.NET MVC | ??? Windows Presentation Foundation | Java FX? Windows Communication Foundation | ??? ASP.NET AJAX Toolkit | ??? Reporting Services/RDLC | ??? LINQ to SQL Classes | ??? Windows Forms | ???

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• How should I port this Prototype to JQuery?

  - by blu

  There is currently this Prototype code that does a PUT: new Ajax.Request(someUrl, { method: 'put', parameters: { 'foo': bar }, onSuccess: function(response) { } .bind(this) }); I found this post but the solution uses an extra parameter supported by RoR, however I am targeting an ASP.NET backend. I searched a bit and found that not all browsers support PUT operations so apparently this could fail in certain browsers? This is already in prod, so a direct port would be fine for now I suppose. As an aside, what is the deal with the bind(this) in the onSuccess function?

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• php curl: how can i emulate a get request exactly like a web browser?

  - by ufk

  Hi. there are websites that when i open specific ajax request on browser i get the resulted page, but when i try to load them with curl, i receive an error from the server. how can i properly emulate a get request to the server that will simulate a browser ? that's what i'm doing: $url="https://new.aol.com/productsweb/subflows/ScreenNameFlow/AjaxSNAction.do?s=username&f=firstname&l=lastname"; ini_set('user_agent', 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)'); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL,$url); $result=curl_exec($ch); print $result;

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• Facebook app: Using Flex or JQuery

  - by javanes

  Hello; I am about to start a new project, a facebook app. There are two alternatives for client-side in my mind. Write Flex-Facebook app. Or write html with Ajax and Jquery. So what are your opinion, which do you recommend? What are the issues about each to take into account? Advantages, disadvantages, subjective opinion? Thank you help me decide..

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• Can I bind multiple forms to a single model using the default model binder?

  - by MedicineMan

  I have a complex page with several forms on it. The page is divided into sections, and each section has a continue button on it. The page is bound to a pageViewModel, each section addresses a different set of properties on the model. The continue button makes an ajax call to the controller, and the model binder binds it appropriately to the appropriate sections of the model. The section is refreshed appropriately. Finally, I would like to have a save button at the bottom of the page that takes all the forms, and binds all of the forms to the model. The model, at this point has all of the properties filled out, and can be processed accordingly. Can I accomplish this by some ASP MVC magic?

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• Why can host and nslookup resolve a name but dig cannot?

  - by musashiXXX

  Can anyone tell me why this is happening? I can resolve a hostname using host and/or nslookup but forward lookups do not work with dig; reverse lookups do: musashixxx@box:~$ host someserver someserver.somenet.internal has address 192.168.0.252 musashixxx@box:~$ host 192.168.0.252 252.0.168.192.in-addr.arpa domain name pointer someserver.somenet.internal. musashixxx@box:~$ nslookup someserver Server: 192.168.0.253 Address: 192.168.0.253#53 Name: someserver.somenet.internal Address: 192.168.0.252 musashixxx@box:~$ nslookup 192.168.0.252 Server: 192.168.0.253 Address: 192.168.0.253#53 252.0.168.192.in-addr.arpa name = someserver.somenet.internal. musashixxx@box:~$ dig someserver ; <<>> DiG 9.8.1-P1 <<>> someserver ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 55306 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;someserver. IN A ;; Query time: 0 msec ;; SERVER: 192.168.0.253#53(192.168.0.253) ;; WHEN: Wed Oct 3 15:47:38 2012 ;; MSG SIZE rcvd: 27 musashixxx@box:~$ dig -x 192.168.0.252 ; <<>> DiG 9.8.1-P1 <<>> -x 192.168.0.252 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28126 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;252.0.168.192.in-addr.arpa. IN PTR ;; ANSWER SECTION: 252.0.168.192.in-addr.arpa. 3600 IN PTR someserver.somenet.internal. ;; Query time: 0 msec ;; SERVER: 192.168.0.253#53(192.168.0.253) ;; WHEN: Wed Oct 3 15:49:11 2012 ;; MSG SIZE rcvd: 86 Here's what my resolv.conf looks like: nameserver 192.168.0.253 search somenet.internal Is this behavior normal? Any thoughts?

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• How do you access URL text following the # sign through Java?

  - by cmcculloh

  Using Java (.jsp or whatever) is there a way where I can send a request for this page: http://www.mystore.com/store/shelf.jsp?category=mens#page=2 and have the Java code parse the URL and see the #page=2 and respond accordingly? Basically, I'm looking for the Java code that allows me to access the characters following the hash tag. The reason I'm doing this is that I want to load subsequent pages via AJAX (on my shelf) and then allow the user to copy and paste the URL and send it to a friend. Without the ability of Java being able to read the characters following the hash tag I'm uncertain as to how I would manipulate the URL with Javascript in a way that the server would be able to also read without causing the page to re-load. I'm having trouble even figuring out how to access/see the entire URL (http://www.mystore.com/store/shelf.jsp?category=mens#page=2) from within my Java code...

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• Where to learn about HTTP?

  - by razass

  I am fluent in HTML and PHP and slowly learning JavaScript however I have noticed that there is a huge hole in my knowledge when it comes to understanding how web software communications actually work. I understand the flow of information across the net however I would like to learn about HTTP protocols to better understand how the data is actually sent back and forth through the internet to help me understand things like REST, HTTP Headers, AJAX requests, etc. However, I must be searching the wrong terms because I haven't been able to find a good description of HTTP protocols. Any help is appreciated to point me in the right direction. Thanks!

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