ASP.NET

Re: Javascript validation in asp.net for a textbox and dropdown

15-Sep-09 21:15

Well, if you want to hire someone to do your job for you, the job board is just over there. On the other hand, if you intend on being a programmer yourself, you should look up regular expression validators in that book that you surely bought to help you learn ASP.NET.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Abhishek Sur15-Sep-09 21:52

Re: Javascript validation in asp.net for a textbox and dropdown

15-Sep-09 21:52

use

onblur="javascript: return reqcheck()" id="txt"

function reqcheck()
{
 var txt = document.getElementById('txt');
 if(txt.value.length == 0) return false;
 return true;
}

Abhishek Sur

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Christian Graus15-Sep-09 21:57

Re: Javascript validation in asp.net for a textbox and dropdown

15-Sep-09 21:57

Um, this will return true or false for one of the cases he mentioned, but how will it perform validation ?

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Abhishek Sur15-Sep-09 22:09

Re: Javascript validation in asp.net for a textbox and dropdown

15-Sep-09 22:09

I dont know why those people dont use RequiredFieldValidators or RegularExpressionValidators for this.... I think those checks both in server as well as client.. Big Grin | :-D

Anyway, he can trap others in
form onsubmit="javascript: return validatefunction();"
I guess. I thought he can do the others himself. Poke tongue | ;-P

Abhishek Sur

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Christian Graus15-Sep-09 22:10

Re: Javascript validation in asp.net for a textbox and dropdown

15-Sep-09 22:10

Abhishek Sur wrote:
I thought he can do the others himself.

*grin* if he were capable of that, he'd be capable of working out what a regularexpressionvalidator was.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Abhishek Sur15-Sep-09 22:43

Re: Javascript validation in asp.net for a textbox and dropdown

15-Sep-09 22:43

Yes you are right. Poke tongue | ;-P

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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Arun Jacob15-Sep-09 22:51

Arun Jacob

15-Sep-09 22:51

MSDN is a primary resource for this type of doubts,

Have a look at Validator Controls.
Smile | :)

Arun Jacob
http://codepronet.blogspot.com/

Problem in populating a treeview from database

rinku soni 2315-Sep-09 20:23

rinku soni 23

15-Sep-09 20:23

Hellon every one.I have a table as follow;

Node_Id Node_Name Parent_Id
1 Classified 0
2 Job 1
3 Matrimony 1
4 Property 1
5 ChildofJob1 2
6 Childofjob2 2

i am using following code,but its not giving me proper structure.

My logic is,i add the node in to treeview at the same time i also check is this node present into Arraylist or not,if yes then i don't add that node if no then add the node to treeview as well as arraylist also.This procedure used for each and every node of tree.

// For database operation

OdbcConnection con = CodeClass.GetConnetion();
OdbcDataAdapter adapter1 = new OdbcDataAdapter("select * from AdminAddNewItem ", con);
OdbcDataAdapter adapter2 = new OdbcDataAdapter("select * from AdminAddNewItem ", con);
DataSet ds = new DataSet();
adapter1.Fill(ds, "Parent");
adapter2.Fill(ds, "Child");
ds.Relations.Add("relation", ds.Tables["Parent"].Columns["Node_Id"], ds.Tables["Child"].Columns["Parent_Id"]);
// ========================================================================================

//I am takeing a arraylist in which i am going to maintan all nodes
ArrayList list = new ArrayList();
string listitem;
int flage1 = 0;
int flage2 = 0;

//=============================
foreach (DataRow Prow in ds.Tables["Parent"].Rows)
{

// code for add parent nodes
TreeNode pnode = new TreeNode(Prow["Node_Name"].ToString(), Prow["Parent_Id"].ToString());

//code for chech whather the node already present or not

for (int i = 0; i < list.Count; i++)
{

if (pnode.Text.ToString() == list[i].ToString ())
{
flage1++;
break;
}

}
if (flage1 > 0)
{

flage1 = 0;
Response.Write("Node already exist");

}

else
{

TreeView1.Nodes.Add(pnode);
list.Add(pnode.Text.ToString());
}

//code for add Child nodes
// if (Prow.GetChildRows("relation") != null)
{
foreach (DataRow Crow in Prow.GetChildRows("relation"))
{
TreeNode Childnode = new TreeNode(Crow["Node_Name"].ToString());
pnode.ChildNodes.Add(Childnode);
list.Add(Childnode.Text .ToString ());
}
}

}

Abhijit Jana15-Sep-09 20:27

Abhijit Jana

15-Sep-09 20:27

Please post your code with proper format.

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
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Christian Graus15-Sep-09 21:18

15-Sep-09 21:18

If your code works at all, it defines two levels, not three. I would imagine you can't do this in a way where you just bind to a datasource, or expect a table to work out the details for you. Your code is hideously inefficient on many fronts. It looks to me like it will add every node at the top level, also.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

N a v a n e e t h15-Sep-09 22:08

N a v a n e e t h

15-Sep-09 22:08

A tree is a basic data structure and everyone should know to work with that.

When you add a node, you need to find the parent of that node using the parent id. To do this, keep a reference to the root node and iterate recursively until you find the node with the parent id. New node should be added as a child of this node.

Above method has a O(n) complexity where n is the total number of nodes in a tree. An efficient approach will be to keep each node in an associative container with node id as key. When adding each item, look for a TreeNode object in this container. Here is a working code.

void PopulateTreeView(DataTable dt, TreeView tv)
{
    Dictionary<int, TreeNode> nodes = new Dictionary<int, TreeNode>();
    TreeNode root = null;
    foreach (DataRow row in dt.Rows)
    {
        int parentId = int.Parse(row["Parent_Id"].ToString());
        int nodeId = int.Parse(row["Node_Id"].ToString());
        string nodeName = row["Node_Name"].ToString();

        TreeNode node;
        if (nodes.TryGetValue(parentId, out node))
        {
            TreeNode newNode = new TreeNode(nodeName);
            nodes.Add(nodeId, newNode);
            node.ChildNodes.Add(newNode);
        }
        else
        {
            node = new TreeNode(nodeName);
            nodes.Add(nodeId, node);
            node.ChildNodes.Add(node);
            if (parentId == 0)
                root = node;
        }
    }
    tv.Nodes.Add(root);
}

Navaneeth

How to use google | Ask smart questions

Abhishek Sur15-Sep-09 22:11

15-Sep-09 22:11

Good answer bro .. Thumbs Up | :thumbsup:

Abhishek Sur

My Latest Articles
Create CLR objects in SQL Server 2005
C# Uncommon Keywords
Read/Write Excel using OleDB
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How dynamic objects work during a post back

N a v a n e e t h15-Sep-09 22:14

N a v a n e e t h

15-Sep-09 22:14

Thanks mate.

Navaneeth

How to use google | Ask smart questions

compninja2515-Sep-09 14:58

compninja25

15-Sep-09 14:58

Hello everyone,

I'm working on a web form and I'm dynamically creating a table on the page with two columns. One column has the text description, and the second has a check box which the user can check or uncheck to indicate that they want that particular item to activated. Because each user will have a different amount of options, I felt it best to build the table rows on the fly after I discover who the user is. The only problem I am fighting with now is that after I build the page and do any post back, the dynamic control is no longer there. Has anyone out there ever tried anything similar? I'm thinking I need to modify the post back somehow to indicate that I want the control to submit the check boxes back to the server so I can process them.

Thanks!

Knowledge is not power, however, the acquisition and appropriate application of knowledge can make you a very powerful individual.

Christian Graus15-Sep-09 15:00

15-Sep-09 15:00

You need to create the control on every postback. And you need to do it before pageload if you want any sort of viewstate to be restored.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

compninja2515-Sep-09 16:13

compninja25

15-Sep-09 16:13

Hi Christian,

Thanks for the input. Kudos on your blog too!

So, I need to use the Page.PreLoad event and build my control there? Right now I'm building the table using data from my database, so if I did that during the page preload, wouldn't that overwrite the post back arguments? Or do I have that backwards? If I create the table during the preload, will the changes in the post back overwrite the results from the database? Sorry if it sounds like a 'you should already know this' type question. I've been reviewing the articles I've found online about the page lifecycle, but it still seems a little vauge to me.

Knowledge is not power, however, the acquisition and appropriate application of knowledge can make you a very powerful individual.

N a v a n e e t h15-Sep-09 16:18

N a v a n e e t h

15-Sep-09 16:18

compninja25 wrote:
So, I need to use the Page.PreLoad event and build my control there?

Init will be a good place for dynamic controls.

It looks like you are displaying tabular data. Why don't you try controls like GridView or DataGrid? GridView has inbuilt checkbox support. In DataGrid, a checkbox can be added by using a template column. If you can do that, you don't need to worry about the viewstate issues.

Smile | :)

Navaneeth

How to use google | Ask smart questions

compninja2516-Sep-09 2:08

compninja25

16-Sep-09 2:08

Hi Navaneeth,

Indeed, it is tabular data. I've done what you are suggesting before with much larger amounts of data, but because in general the task at hand is only calling for 2 through 5 options to display to the user, I originally thought it would be quicker to just build a quick table and add the few rows. Anyhoo, I did consider using the data grid, but figured I'd like to look into trying to get the dynamic control working first as a way to learn more about the page life cycle and view state. Hopefully it will come in handy somewhere down the line! Smile | :)

Thanks again for your response!

Knowledge is not power, however, the acquisition and appropriate application of knowledge can make you a very powerful individual.

Christian Graus15-Sep-09 16:19

15-Sep-09 16:19

compninja25 wrote:
So, I need to use the Page.PreLoad event and build my control there?

I believe that is correct.

compninja25 wrote:
Right now I'm building the table using data from my database, so if I did that during the page preload, wouldn't that overwrite the post back arguments?

you do it precisely so that you can get your postback data. The control needs to exist in order for the system to populate it with data from postback. I'd expect if you want to put your own data in there, you'd do it in prerender, which is always the right place. But for viewstate to work, it needs to be created before page load.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Abhijit Jana15-Sep-09 18:26

Abhijit Jana

15-Sep-09 18:26

Christian Graus wrote:
compninja25 wrote:
So, I need to use the Page.PreLoad event and build my control there?

I believe that is correct.

Boss,
I have one small doubt over here, AFAIK , we need to create the control either Init or PreInit for maintaining the post back. Because Though, LoadViewState and Loadpostback Data Calls before Page_Load(), ASP.NET Creates a control hierarchy only at Init event, based on that the postback data and view state data maintains. So, How it would restore view state and postback data if we create control on Pre_Load() ?.

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

Arun Jacob15-Sep-09 18:58

Arun Jacob

15-Sep-09 18:58

Abhijit Jana wrote:
we need to create the control either Init or PreInit for maintaining the post back

I guess whatever u said is correct its better to create dynamic controls on Init according to the Event Cycle.Control developers are mostly rely on this event.Otherwise we need to manually keep the View state.
Smile | :)

Arun Jacob
http://codepronet.blogspot.com/

Abhijit Jana15-Sep-09 19:08

Abhijit Jana

15-Sep-09 19:08

Yes, But my question was different. We need to create those dynamic control over Init and Preinit() because of maintaining view state and load postback data. And In Init Event ASP.NET Create a control list to do all the operation during page life cycle.

Suppose you are creating one Dynamic Textbox on Page_Load and done some post back after changing some value of that textbox .As per the Page_Life Cycle goes, View State Data for the newly created text box has been saved because, SaveViewdata() calls after Pre_Render and Before Render().
Its means My View State data has been saved but, now why that data would not restored ? Though my ViewState data has already saved and LoadView State Data is calling before Page_load. So it should restore the data. But It should not. Beacuse, the reason I have said. In Init() asp.net creats an Control Tree. If you create the control on/after Page_Load, they are not a member of that tree.
There is also some workaround for it. Wink | ;)

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.