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  • ASP.NET AJAX, jQuery and AJAX Control Toolkit&ndash;the roadmap

    - by Harish Ranganathan
    The opinions mentioned herein are solely mine and do not reflect those of my employer Wanted to post this for a long time but couldn’t.  I have been an ASP.NET Developer for quite sometime and have worked with version 1.1, 2.0, 3.5 as well as the latest 4.0. With ASP.NET 2.0 and Visual Studio 2005, came the era of AJAX and rich UI style web applications.  So, ASP.NET AJAX (codenamed “ATLAS”) was released almost an year later.  This was called as ASP.NET 2.0 AJAX Extensions.  This release was supported further with Visual Studio 2005 Service Pack 1. The initial release of ASP.NET AJAX had 3 components ASP.NET AJAX Library – Client library that is used internally by the server controls as well as scripts that can be used to write hand coded ajax style pages ASP.NET AJAX Extensions – Server controls i.e. ScriptManager,Proxy, UpdatePanel, UpdateProgress and Timer server controls.  Works pretty much like other server controls in terms of development and render client side behavior automatically AJAX Control Toolkit – Set of server controls that extend a behavior or a capability.  Ex.- AutoCompleteExtender The AJAX Control Toolkit was a separate download from CodePlex while the first two get installed when you install ASP.NET AJAX Extensions. With Visual Studio 2008, ASP.NET AJAX made its way into the runtime.  So one doesn’t need to separately install the AJAX Extensions.  However, the AJAX Control Toolkit still remained as a community project that can be downloaded from CodePlex.  By then, the toolkit had close to 30 controls. So, the approach was clear viz., client side programming using ASP.NET AJAX Library and server side model using built-in controls (UpdatePanel) and/or AJAX Control Toolkit. However, with Visual Studio 2008 Service Pack 1, we also added support for the ever increasing popular jQuery library.  That is, you can use jQuery along with ASP.NET and would also get intellisense for jQuery in Visual Studio 2008. Some of you who have played with Visual Studio 2010 Beta and .NET Framework 4 Beta, would also have explored the new AJAX Library which had a lot of templates, live bindings etc.,  But, overall, the road map ahead makes it much simplified. For client side programming using JavaScript for implementing AJAX in ASP.NET, the recommendation is to use jQuery which will be shipped along with Visual Studio and provides intellisense as well. For server side programming one you can use the server controls like UpdatePanel etc., and also the AJAX Control Toolkit which has close to 40 controls now.  The AJAX Control Toolkit still remains as a separate download at CodePlex.  You can download the different versions for different versions of ASP.NET at http://ajaxcontroltoolkit.codeplex.com/ The Microsoft AJAX Library will still be available through the CDN (Content Delivery Network) channels.  You can view the CDN resources at http://www.asp.net/ajaxlibrary/CDN.ashx Similarly even jQuery and the toolkit would be available as CDN resources in case you chose not to download and have them as a part of your application. I think this makes AJAX development pretty simple.  Earlier, having Microsoft AJAX Library as well as jQuery for client side scripting was kind of confusing on which one to use.  With this roadmap, it makes it simple and clear. You can read more on this at http://ajax.asp.net I hope this post provided some clarity on the AJAX roadmap as I could decipher from various product teams. Cheers!!!

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  • ScriptManager duplicates javascript

    - by Andreas
    Hi! I have a usercontrol that can be used in for example a gridview itemtemplate, this means that the control might or might not be on the page at page load. In the case where the control is inside an itemtemplate i will popupate the gridview via asyncronous postbacks (via updatepanels). The control itselfs registrers scriptblocks since it is depending on javascripts. First i used Page.ClientScript.RegistrerClientScriptBlock But this doesn't work on asyncronous postbacks (updatepanels) so i then tried the same using ScriptManager which allows me to registrer scripts on the page after async postbacks. great!. ScriptManager.RegisterClientScriptBlock However, ScriptManager (what i know of) does not have the functionallity to see if a script already is on the page, so i will for every postback generate duplicates of the script blocks, this is ofcourse unwanted behaviour. I did a run at Google and found that i can call the Dispose() method of the PageRequestManager can be used, this does work since it clears the scripts and then adding them again (this also solves my issue with removing unused script blocks from removed controls). Sys.WebForms.PageRequestManager.getInstance().Dispose() However, ofcourse there is a downside since im posting here :). The Dispose() method disposes the instance on the master page as well which leads to scripts running there will stop to function after an async postback (updateprogress for example). So, is there a way to check if a script already exists on the page using ScriptManager or any other tools, that will prevent me of inserting duplicate scripts? Also, is there a way to remove certain script blocks (when i am removing an item in itemtemplate for example). Big thanks in advance.

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  • Android custom ListView unable to click on items

    - by MattC
    So I have a custom ListView object. The list items have two textviews stacked on top of each other, plus a horizontal progress bar that I want to remain hidden until I actually do something. To the far right is a checkbox that I only want to display when the user needs to download updates to their database(s). When I disable the checkbox by setting the visibility to Visibility.GONE, I am able to click on the list items. When the checkbox is visible, I am unable to click on anything in the list except the checkboxes. I've done some searching but haven't found anything relevant to my current situation. I found this question but I'm using an overridden ArrayAdapter since I'm using ArrayLists to contain the list of databases internally. Do I just need to get the LinearLayout view and add an onClickListener like Tom did? I'm not sure. Here's the listview row layout XML: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="?android:attr/listPreferredItemHeight" android:padding="6dip"> <LinearLayout android:orientation="vertical" android:layout_width="0dip" android:layout_weight="1" android:layout_height="fill_parent"> <TextView android:id="@+id/UpdateNameText" android:layout_width="wrap_content" android:layout_height="0dip" android:layout_weight="1" android:textSize="18sp" android:gravity="center_vertical" /> <TextView android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1" android:id="@+id/UpdateStatusText" android:singleLine="true" android:ellipsize="marquee" /> <ProgressBar android:id="@+id/UpdateProgress" android:layout_width="fill_parent" android:layout_height="wrap_content" android:indeterminateOnly="false" android:progressDrawable="@android:drawable/progress_horizontal" android:indeterminateDrawable="@android:drawable/progress_indeterminate_horizontal" android:minHeight="10dip" android:maxHeight="10dip" /> </LinearLayout> <CheckBox android:text="" android:id="@+id/UpdateCheckBox" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> And here's the class that extends the ListActivity. Obviously it's still in development so forgive the things that are missing or might be left laying around: import java.util.List; import android.app.ListActivity; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import com.xxxx.android.R; import com.xxxx.android.DAO.AccountManager; import com.xxxx.android.model.UpdateItem; public class UpdateActivity extends ListActivity { AccountManager lookupDb; boolean allSelected; UpdateListAdapter list; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); lookupDb = new AccountManager(this); lookupDb.loadUpdates(); setContentView(R.layout.update); allSelected = false; list = new UpdateListAdapter(this, R.layout.update_row, lookupDb.getUpdateItems()); setListAdapter(list);

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  • ASP.Net/C# File Upload Progress Display

    - by Ioxp
    I am having a hard time figuring out how to do a "Please wait while file is uploading" message when the user submits the following form. So far the application works to specification with regards to checking files and uploading to the server. You will see some java script below, this is there to allow me to fake out the style of the file up load buttons so that it matches the rest of the site. I have tried to use the ASP.Net Ajax controls to do this however the updateprogress panel would not show up. In further reading it was explained that this has something to do with the Asynchronous transfer that the file upload control uses when you issue a PostedFile.SaveAs("filename") command. I also found a site that refereed to using an iframe to do the job. I'm not really sure if that's the best way to go about doing this or not so I'm asking you the professionals of stackoverflow for help to try and resolve this issue. I will be more than happy to post any spinets you need from my code to help me expedite a solution for this. <table border="0"> <tr> <td>File 1:&nbsp;</td> <td><div class="fileinputs"><input type="file" class="file" size="37" id="f1" runat="server" /></div></td> </tr> <tr> <td>File 2:&nbsp;</td> <td><div class="fileinputs"><input type="file" class="file" size="37" id="f2" runat="server" /></div></td> </tr> <tr> <td colspan="2" style="text-align:right;"><asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/Images/Buttons/Upload_Files.gif" OnClick="Submit_Form" /></td> </tr> </table> <asp:Label ID="lblError" runat="server" Text=""></asp:Label> <script type="text/javascript"> var fakeFileUpload = document.createElement('div'); fakeFileUpload.className = 'fakefile'; var fakeInput = document.createElement('input'); fakeInput.style.width = '200px'; fakeFileUpload.appendChild(fakeInput); var image = document.createElement('img'); image.src='../Images/Buttons/Browse.gif'; fakeFileUpload.appendChild(image); var x = document.getElementsByTagName('input'); for (var i=0;i<x.length;i++) { if (x[i].type != 'file') continue; if (x[i].parentNode.className != 'fileinputs') continue; x[i].className = 'file hidden'; var clone = fakeFileUpload.cloneNode(true); x[i].parentNode.appendChild(clone); x[i].relatedElement = clone.getElementsByTagName('input')[0]; x[i].onchange = x[i].onmouseout = function () { this.relatedElement.value = this.value; } } </script>

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