ASP.NET

Editable combobox in ASP.Net

21-Mar-08 19:57

Yes, get the user to disable them. This is a security feature, you can't just turn it off remotely

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

new2pgrmg21-Mar-08 19:51

new2pgrmg

21-Mar-08 19:51

Hi,

Is it possible to have a combobox in ASP.Net were a user can enter new values or edit the existing values.

I searched via google but am not getting the simplest way to do this.

Am new to ASP ,any help will be welcome.

Any links or ideas are welcome.

Many Thanks

Re: Editable combobox in ASP.Net

Christian Graus21-Mar-08 19:57

access server controls using javascript in web user controls

21-Mar-08 19:57

I doubt it. You could do some javascript to alternate between a textbox and a dropdownlist, but I don't think a HTML drop list is ever editable.

indian14321-Mar-08 18:38

Re: access server controls using javascript in web user controls

21-Mar-08 18:38

Hi All,

I want to access server controls using javascript in web user controls. I tried it by using "i=document.all.txtActualCost.value;" statement. But it is giving error. Please can anybody help me.

Thanks,
Aleem Mohammad

S/W Engineer
Akebono Soft Technologies
aleem_abdul@akebonosoft.com.

Christian Graus21-Mar-08 19:32

Re: access server controls using javascript in web user controls

21-Mar-08 19:32

Your first port of call ( apart from google ) should be to look at the actual HTML being generated. ASP.NET generates unique client side names. That means the server side name is not it.

On the server side, txtActualCost has a property called ClientID. Emit some script that stores this value for the client side and use that.

indian14321-Mar-08 19:51

Re: access server controls using javascript in web user controls

21-Mar-08 19:51

Hi Christian,
I have tried it too, by using the i=getElementByID("txtActualCost").value;. It is too giving error. And not getting much support from google too. Please can any body help me.

Thanks,
Aleem Mohammad

S/W Engineer
Akebono Soft Technologies
aleem_abdul@akebonosoft.com.

Christian Graus21-Mar-08 20:02

Re: access server controls using javascript in web user controls

21-Mar-08 20:02

Please read what I told you. What you're doing, won't work, for the reason I just explained. Please do what I suggested - look at the HTML and you'll see what it's called on the client. The nasty hack is to copy that value, the right way is to use the ClientID property to write out the right string into your javascript.

indian14322-Mar-08 2:07

Re: access server controls using javascript in web user controls

22-Mar-08 2:07

Sorry christian I got it. And became busy thats why I didnt inform you yaar. Sorry.

Aleem Mohammad.

S/W Engineer
Akebono Soft Technologies
aleem_abdul@akebonosoft.com.

N a v a n e e t h21-Mar-08 20:20

N a v a n e e t h

21-Mar-08 20:20

indian143 wrote:
i=getElementByID("txtActualCost").value

As CG suggested, use ClientId. If your server control is in a user control, ASP.NET prefixes the user control's id with the control id. So your getElementById('ControlName') won't work. Use ClientId instead.

var controlId = '<% ControlId.ClientId %>';
var controlObject = document.getElementById(controlId);

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

How to use google | Ask smart questions

Re: access server controls using javascript in web user controls

indian14322-Mar-08 2:12

Re: access server controls using javascript in web user controls

22-Mar-08 2:12

I got it Navaneeth, but why document.getElementById() function is not working at my machine. I guess its browsers version problem. At clients place how can we solve this problem. Can you please suggest me yaar.

Thanks,
Aleem Mohammad.

S/W Engineer
Akebono Soft Technologies
aleem_abdul@akebonosoft.com.

N a v a n e e t h22-Mar-08 5:52

N a v a n e e t h

22-Mar-08 5:52

indian143 wrote:
but why document.getElementById() function is not working at my machine

As I told, use ClientId instead. Appending container id with control's id is a ASP.NET mechanism to keep control id unique throughout the page.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

How to use google | Ask smart questions

How to: Create a MessageBox Class for Asp.Net

ScepterMT21-Mar-08 14:25

ScepterMT

21-Mar-08 14:25

When I began the programming for http://www.sceptermarketingtechnologies.com, I quickly noticed that Asp.net does not support the MessageBox class that I was familiar with in windows forms.

Since Asp.net runs on the server it doesn't have access to produce a modal dialog box on the client. However, by using a scripting language that runs in the clients browser a similar construct is available. In javascript the window.alert() function will produce a modal dialog similar to what you would expect from MessageBox in windows forms.

So, I decided to create a static class MessageBox with a static method Show(), which will give you the ablility to to still use the syntax MessageBox.Show("Your Message"); and then convert it into the javascript window.alert("Your Message"); and add the script to the end of the current response stream.

I've written a how to on my blog at: http://sceptermt.blogspot.com/2008/02/how-to-create-message-box-class-in-c.html that shows the source code that I used in C# for my web application and details on how it works.

You could also write overloads for the static show() method to allow the class to do a javascript confirm() or a prompt(). I haven't needed that functionality yet so I've just kept it simple.

Re: How to: Create a MessageBox Class for Asp.Net

Christian Graus21-Mar-08 16:54

21-Mar-08 16:54

We have articles on this site. Sounds like you're looking to write one ?

Database Engines

Mohammad A Gdeisat21-Mar-08 12:37

Mohammad A Gdeisat

21-Mar-08 12:37

Hi,

I am new to ASP .NET and I am creating an e-exam website for a customer, the customer will have at most 50 students taking an exam simultanously.

I want to create a Microsoft Jet (Access) database (.mdb), but I know that Access database format is not designed to be used in websites where concurrency is an issue.

The question is:
Can Microsoft Access database files bear the load of 50 students submitting their answers almost at the same time or do I need an SQL server database? I don't know but I think that 50 users is a very small load even for this kind of database.

Any answers?

Thanks Poke tongue | ;-P

And ever has it been that love knows not its own depth until the hour of separation

Christian Graus21-Mar-08 12:54

21-Mar-08 12:54

Mohammad A Gdeisat wrote:
I am new to ASP .NET and I am creating an e-exam website for a customer

It's only a matter of time before the backlash starts because of people who take on clients in technologies they are new to.

I would say go with SQL Server. According to google[^], 10 is the limit for the Jet engine, even across different apps. That doesn't mean that you can even have 10 concurrent users for an Access DB, let alone 50.

Mohammad A Gdeisat21-Mar-08 12:57

Mohammad A Gdeisat

21-Mar-08 12:57

Ok, now my client wants to install the website on his own server (in the school). The server is running Windows XP.

Does my client need to install any applications (other than IIS) to make the website work with SQL server database?

Thanks Smile | :)

And ever has it been that love knows not its own depth until the hour of separation

Christian Graus21-Mar-08 13:02

21-Mar-08 13:02

I recommend reaing this[^].

No, he doesn't need anyting else, but for 50 users, he's going to have to buy SQL Server, I believe that's more than the Express Edition will support.

Mohammad A Gdeisat21-Mar-08 13:12

Mohammad A Gdeisat

21-Mar-08 13:12

I just have one more question about the same issue.

I don't want my client to buy SQL server (if possible), so I would suggest myself to place the code that tries to connect to the database in a loop that checks whether the connection has succeeded or not, if it succeeds then it will update the database, if not, then it will try to connect again and again until it succeeds and then update the database, and so on.

Does this solve part of the issue or is it a BAD solution?

Thanks Smile | :)

And ever has it been that love knows not its own depth until the hour of separation

Christian Graus21-Mar-08 13:22

21-Mar-08 13:22

I guess it depends. He's probably paying you little enough that if you can handle the work, writing some sort of caching that does the DB updates when the DB is free, may be a viable solution. It's a hack tho. You still will be using a tool that's not suited to the task, when 50 students make a request that takes some time, if they all have to wait their turn, you risk web pages timing out, and your app breaking.

Brady Kelly21-Mar-08 23:43

Brady Kelly

21-Mar-08 23:43

Only 2 out of our 190 client sites use full SQL Server. There are no more connection limits on 2005, just CPU and RAM, so for a standard DB, without additional services, there is nothing wrong with Express for 50 users.

Paul Conrad21-Mar-08 13:16

Paul Conrad

21-Mar-08 13:16

Christian Graus wrote:
only a matter of time before the backlash starts because of people who take on clients in technologies they are new to

Yep.

Christian Graus wrote:
10 concurrent users for an Access DB, let alone 50

A client of mine uses Access with about 10-15 concurrent and I've warned them about consequences of overloading the database. They want to add a few more people, and we'll see Roll eyes | :rolleyes:

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus