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  • DataGridView live display of datatable using virtual mode

    - by Chris
    I have a DataGridView that will display records (log entries) from a database. The amount of records that can exist at a time is very large. I would like to use the virtual mode feature of the DataGridView to display a page of data, and to minimize the amount of data that has to be transferred across a network at a given time. Polling for data is out of the question. There will be several clients running at a time, all of which are on the same network and viewing the records. If they all poll for data, the network will run very slowly. The data is read-only to the user; they won't be able to edit any of it, just view it. I need to know when updates occur in the database, and I need to update the screen with those updates accordingly using virtual mode. If a page of data a user is viewing contains data that has change, he/she will see those updates on that page. If updates were made to data in the database, but not in the data the user is viewing, then not much really changes on the user screen (Maybe just the scroll bar if records were added or removed). My current approach is using SQL server change tracking with the sync framework. Each client has a local SQL Server CE instance and database file that is kept in sync with the main database server. I use the information from the synchronization event to see if any changes were made to the main database and were sync'ed to the client. I need to use the DataGridView virtual mode here because I can't have thousands of records loaded into the DataGridView at once, otherwise memory usage goes through the roof. The main challenge right now is knowing how to use virtual mode to provide a seamless experience to the user by allowing them to scroll up and down through the records, and also have records update on the fly without interfering with the user inappropriately. Has anybody dealt with this issue before, and if so, where I can see how they did it? I've gone through some of the MSDN documentation and examples on virtual mode. So far, I haven't found documentation and/or examples on their site that explains how to do what I am trying to accomplish.

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  • MS Access 07 - Q re lookup column vs many-to-many; Q re checkboxes in many-to-many forms

    - by TBinLondon
    Hello, I'm creating a database with Access. This is just a test database, similar to my requirements, so I can get my skills up before creating one for work. I've created a database for a fictional school as this is a good playground and rich data (many students have many subjects have many teachers, etc). Question 1 What is the difference, if any, between using a Lookup column and a many-to-many associate table? Example: I have Tables 'Teacher' and 'Subject'. Many teachers have many subjects. I can, and have, created a table 'Teacher_Subject' and run queries with this. I have then created a lookup column in teachers table with data from subjects. The lookup column seems to take the place of the teacher_subject table. (though the data on relationships is obviously duplicated between lookup table and teacher_subject and may vary). Which one is the 'better' option? Is there a snag with using lookup tables? (I realize that this is a very 'general' question. Links to other resources and answers saying 'that depends...' are appreciated) Question 2 What attracts me to lookup tables is the following: When creating a form for entering subjects for teachers, with lookup I can simply create checkboxes and click a subject for a teacher 'on' or 'off'. Each click on/off creates/removes a record in the lookup column (which replaces teacher_subject). If I use a form from a query from teacher subject with teacher as main form and subject as subform I run into this problem: In the subform I can either select each subject that teacher has in a bombo box, i.e. click, scroll down, select, go to next row, click, scroll down, etc. (takes too long) OR I can create a list box listing all available subjects in each row but allowing me to select only one. (takes up too much space). Is it possible to have a click on/off list box for teacher_subject, creating/removing a record there with each click? Note - I know zero SQL or VB. If the correct answer is "you need to know SQL for this" then that's cool. I just need to know. Thanks!

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  • How does dzone.com maintain state of the div?

    - by CShipley
    When you scroll down to the bottom of http://www.dzone.com/links/ it automatically loads more links. However, when you navigate away, then hit the back button, the contents of the modified div stay there. How do they get the browser to go back to a dynamically generated div?

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  • Preventing fixed footer from overlapping content

    - by Robert Morgan
    I've fixed my footer DIV to the bottom of the viewport as follows: #Footer { position: fixed; bottom: 0; } This works well if there isn't much content on the page. However, if the content fills the full height of the page (i.e. the vertical scroll bar is visible) the footer overlaps the content, which I don't wont. How can I get the footer to stick to the bottom of the viewport, but never overlap the content?

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  • My Pop window displays Horizontal scroller, how to remove it?

    - by OM The Eternity
    My Pop window displays Horizontal scroller, how to remove it? I am using Mozilla 3.6.3, PHP in Windows, I have an anchor tag with href as given below: <a href="javascript:popupWindow('http://example/english/images/buttons/button_invoice.gif"></a> but when I click on this link my pop window is displayed with a horizontal scrollbar.. so help me to remove this horizontal scroll bar...

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  • ScrollView with scrollViews - what is the right way to do it?

    - by hveveris
    Hello! Client wants some tricky stuff and i don't really know where to start with it. The idea is that there is a horizontal scrollView whose each page consists of a vertical scrollView. For example, on the horizontal axis there are galleries, on the vertical we scroll through selected gallery's images. Is this even possible? I'd be very glad to hear comments on this one!

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  • Why does this page scrolls down to the bottom automatically?

    - by Majid
    This happens only with Google Chrome and Safari. This is the page in question: http://jqeedu.tuxfamily.org/pmr/ After opening the landing, click on post your apartment, a form is loaded via ajax, and the page automatically scrolls to the bottom and if you scroll up, it returns to the bottom again! What is causing this?

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  • align an object

    - by Gaurav
    I wanted to align a newsticker about 300px above it's current position , but I am unable to do so. Please help. The page is uploaded for viewing at http://cerebration.0fees.net/test/bottom.html scroll down the page to find the newsticker. The css file contains the css code for the newsticker and the newsticker is of white color(color mentioned for identification). The html page code is at : http://pastebin.com/dP8dSEDS and the css code is as at : http://pastebin.com/46YvqwT7 Thanks in advance.

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  • HTML 5: how to make stackable images?

    - by Bobafett
    Is it possible to load up 10 images (same dimension), stack them on top of one another only showing 1 image at a time and then by holding down the left mouse button and dragging the mouse up you scroll in one direction and moving the mouse down scrolls in the opposite direction?' if so how can this be done? canvas element would be the begining, no?

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  • Window resolution handling without javascript

    - by Sai Sasdhar
    Is there any CSS property to deal window resolution. I created a HTML page taking total resolution width as 1424px.When I open it on different resolution I see a scroll bar & resolution of HTML does not adjust automatically. I don't want the scrollbar to be seen in maximized size of the page. Is it possible without using javascript.At the same time how to increase the resolution when itself is created in lower res.

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  • Keeping Velocity Constant and Player in Position - Sidescrolling

    - by user2904951
    I'm working on a Little Mobile Game with Cocos2D-X and Box2D. The Point where I got stuck is the movement of a box2d-body (the main actor) and the according Sprite. Now I want to : move this Body with a constant velocity along the x-axis, no matter if it's rolling (it's a circleshape) upwards or downwards keep the body nearly sticking to the ground on which it's rolling keep the Body and the according Sprite in the Center of the Screen. What I tried : in the update()- method I used body->SetLinearVelocity(b2Vec2(x,y)) to higher/lower values, if the Body was passing a constant value for his velocity I used to set very high y-Values in body->SetLinearVelocity(b2Vec2(x,y)) First tried to use CCFollow with my playerSprite, which was also Scrolling along the y-axis, as i only need to scroll along the x-axis, so I decided to move the whole layer which is containing the ambience (platforms etc.) to the left of my Screen and my Player Body & Player sprite to the right of the Screen, adjusting the speed values to Keep the Player in the Center of the Screen. Well... ...didn't work as i wanted it to, because each time i set the velocity manually (I also tried to use body->applyLinearImpulse(...) when the Body is moving upwards just as playing around with the value of velocityIterations in world->Step(...)) there's a small delay, which pushes the player Body more or less further of the Center of the Screen. ... didn't also work as I expected it to, because I needed to adjust the x-Values, when the Body was moving upwards to Keep it not getting slowed down, this made my Body even less sticky to the ground.... ... CCFollow did a good Job, except that I didn't want to scroll along the y-axis also and it Forces the overgiven sprite to start in the Center of the Screen. Moving the whole Layer even brought no good results, I have tried a Long time to adjust values of the movement Speed of the layer and the Body to Keep it negating each other, that the player stays nearly in the Center of the Screen.... So my question is : Does anyone of you have any Kind of new Approach for me to solve this cohesive bunch of Problems ? Cheers, Seb

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  • Recreating the Apple Store's summary that moves with the page scrolling

    - by Darryl Hein
    I'm looking to create something like what Apple has on their online store for displaying the summary of your computer and total as seen here. I'm guessing this is JavaScript, but it'd be even cooler if it could be done in CSS. Basically I'd like something scrolls with the page like position:fixed, but I don't want it to start moving until the user has scroll past a certain position. I'm using jQuery, so a jQuery plugin would be perfect as well.

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  • treeview size in wpf

    - by AComputert
    please let me know how can I re size height of tree view control when screen resolution is changed? please see this code: <TreeView Name="treeView1" Height="150" VerticalAlignment="Top"> <TreeViewItem Header="Root" IsExpanded="True"> <TreeViewItem Header="Item 1"></TreeViewItem> <TreeViewItem Header="Item 2"></TreeViewItem> <TreeViewItem Header="Item 3"></TreeViewItem> <TreeViewItem Header="Item 4"></TreeViewItem> <TreeViewItem Header="Item 5"></TreeViewItem> <TreeViewItem Header="Item 6"></TreeViewItem> <TreeViewItem Header="Item 7"></TreeViewItem> <TreeViewItem Header="Item 8"></TreeViewItem> <TreeViewItem Header="Item 9"></TreeViewItem> <TreeViewItem Header="Item 10"></TreeViewItem> <TreeViewItem Header="Item 11"></TreeViewItem> <TreeViewItem Header="Item 12"></TreeViewItem> <TreeViewItem Header="Item 13"></TreeViewItem> <TreeViewItem Header="Item 14"></TreeViewItem> <TreeViewItem Header="Item 15"></TreeViewItem> <TreeViewItem Header="Item 16"></TreeViewItem> <TreeViewItem Header="Item 17"></TreeViewItem> <TreeViewItem Header="Item 18"></TreeViewItem> <TreeViewItem Header="Item 19"></TreeViewItem> <TreeViewItem Header="Item 20"></TreeViewItem> <TreeViewItem Header="Item 21"></TreeViewItem> <TreeViewItem Header="Item 22"></TreeViewItem> <TreeViewItem Header="Item 23"></TreeViewItem> <TreeViewItem Header="Item 24"></TreeViewItem> <TreeViewItem Header="Item 24"></TreeViewItem> </TreeViewItem> </TreeView> in some screen resolutions i can see all nodse and in some resolutions i see a scroll bar. I want to see all nodes without scroll bar.

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  • Android Progress Dialog not showing

    - by ilomambo
    This is the handler, in the main Thread, which shows and dismisses a progress dialog. public static final int SHOW = 0; public static final int DISMISS = 1; public Handler pdHandler = new Handler() { @Override public void handleMessage(Message msg) { Log.i(TAG, "+ handleMessage(msg:" + msg + ")"); switch(msg.what) { case SHOW: pd = ProgressDialog.show(LogViewer.this, "", getText(R.string.loading_msg), true); break; case DISMISS: if(pd != null) { pd.dismiss(); pd = null; } break; } } }; The message to show the progress is: pdHandler.sendMessage(pdHandler.obtainMessage(SHOW)); The message to dismiss it is: pdHandler.sendMessage(pdHandler.obtainMessage(DISMISS)); It works well when I call it before I start an AsyncTask, the AsyncTask onPostExecute() dismisses it. But when it runs within a runnable (runOnUiThread), the dialog does not show. Examining the pd variable on the debugger, it shows that is is created, it is running and it is visible, but in practice it is not visible. Any suggestion? UPDATE: I did the obvious test I should have done in the first place. I commented the DISMISS message. And the progress dialog did show up. It appeared too late, after the runnable was finished. I undestand now that the DISMISS message did dismiss the not-yet-visible ProgressDialog, that's why I did not see it. The question becomes now: I need the ProgressDialog to show BEFORE the runnable code is executed. And it is not so straight forward. My call hierarchy is like this: onScrollEventChanged --> runOnUiThread ( --> checkScrollLimits --> if need to scroll show ProgressDialog "Loading" get new data into table dismiss ProgressDIalog ) I tried something like this: onScrollEventChanged --> checkScrollLimits --> if need to scroll show ProgressDialog "Loading" --> runOnUiThread ( get new data into table dismiss ProgressDIalog ) But still the dismiss message got there before the ProgressDialog could show. According to Logcat there is a five second interval between the arrival of the SHOW message and the arrival of the DISMISS message. UPDATE II: I though I will use the isShowing() method of ProgressDIalog pd = ProgressDialog.show(...) while(!pd.isShowing()); But it does not help at all, it returns true even if the dialog is not showing yet.

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  • UIImagePickerController can not select picture

    - by yjcpu
    I have some problem when i work with UIImagePickerController .when I presentModalViewController,and the picker pops up right,but i can not select a picture! when i touch on the picture list, the list can only scroll up and down,but can not select! how about this? thanks.

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  • Fix buttons at the bottom of the screen.

    - by Wilson
    I am a beginner in Android programming. I want to build a simple application with a main list view in the screen and two buttons at the bottom of the screen. When more items are added to the list view, the list view should scroll without increasing the overall length of the list view.

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