Re: Disable a button a web form. - ASP.NET Discussion Boards

AndieDu12-Mar-09 13:39

12-Mar-09 13:39

Hi All,

My senario is: once a user clicks a button on web form, say Save, how can i disable this button to prevent user click it again.

Because this is a web form, so this one: btnSave.Enable = false wasn't working unitl the web fom refreshs, but i just want this button to be disable as soon as the user clicks it.

could someone in here guide me or point me to the right direction as i am struggling to get this work long time already.

Thanks heaps.

Re: Disable a button a web form.

johnsontroye12-Mar-09 13:43

johnsontroye

12-Mar-09 13:43

use javascript to disable the button.

www.anothercodesite.com/blog

Re: Disable a button a web form.

kumar_k50812-Mar-09 19:51

kumar_k508

12-Mar-09 19:51

Hi,

In the button click event you can write the btnsave.enable=false as a first line ,or else you can do it by using the javascript also ....

S Kumar

Re: Disable a button a web form.

AndieDu15-Mar-09 12:49

AndieDu

15-Mar-09 12:49

this is a web form, not a windows form, what you said in here wont work....

Re: Disable a button a web form.

Rajdev Ramasamy13-Mar-09 0:52

Rajdev Ramasamy

13-Mar-09 0:52

Hi,
Are you using UpdatePanel?

Thanks,
Rajdev KR

Re: Disable a button a web form.

AndieDu15-Mar-09 12:48

AndieDu

15-Mar-09 12:48

sorry what do u mean...

Re: Disable a button a web form.

therios16-Mar-09 12:31

therios

16-Mar-09 12:31

I have done pretty much the same thing. I ended up using a little jscript. I call it with the "true" or "false" that I want the item to have.

function applyvalidate(myenableflag) {
        document.all.validate.disabled = true;
        if (myenableflag == true) {
            document.all.validate.disabled = false;
        }
        if (myenableflag == false) {
            document.all.validate.enabled = false;
        }
    }

The name of the button is "validate". I do this so that the person has to have a valid form (actively check with jscript) and when it is valid, the validate button lights up. they can then hit the validate button that provides a code for entry into a checklist. Then I light up the submit button.

At anytime when the formcheck becomes invalid, i use the same functions to disable the buttons on the fly.

Does that help?

Re: Disable a button a web form.

AndieDu16-Mar-09 12:47

AndieDu

16-Mar-09 12:47

ya it does help. thanks a lot.

Re: Disable a button a web form.

therios16-Mar-09 13:10

therios

16-Mar-09 13:10

Glad it helped. I can't even remember how and where I stumbled across that... allowed me to do a TON of client side automation on forms. Probably NOT the best solution, but in specific areas, it works well...

download works in IE but not in firefox

Meax12-Mar-09 12:19

Meax

12-Mar-09 12:19

<br />
Response.Clear()<br />
        Response.AddHeader("Content-Disposition", "attachment; filename=" & fileName)<br />
        Response.ContentType = "application/octet-stream"<br />
        Response.TransmitFile(FullFilePath)<br />
        Response.End()<br />

with this code i am unable to open the downloaded files, if browser is FireFox.

Controls Are Coming Over to Calendar....

Sr...Frank12-Mar-09 11:17

Sr...Frank

12-Mar-09 11:17

I have a Calendar Extender/JavaScript Calendar[I tested Both] in a TextBox control. There is another TextBoxcontrol below this one. When the Calendar pops up, it is over the lower TextBox and the text and header from that TextBox are showing up over the Calendar. Is there a way to make sure the Calendar is always on top?

Re: Controls Are Coming Over to Calendar....

Jörgen Andersson12-Mar-09 12:13

Jörgen Andersson

12-Mar-09 12:13

See if it supports z-index

loading user info after login from object

liamderice12-Mar-09 9:37

liamderice

12-Mar-09 9:37

hey there, I'm still learning C# and am having some issues with a login I've created. The login page gets the user info into an object and sets the cookie no problem. But when I go to the next page I can't seem to figure out how to get at the object I created on the login page. Here's a snippet of what I've got...

login.aspx.cs

private void cmdLogin_ServerClick(object sender, System.EventArgs e)
{
  UserDetails oUserDetails = validateUser(txtAssocNum.Value, txtUserName.Value, txtUserPass.Value);
  if (oUserDetails != null) 
  {
    //UserDetails oUserDetails = new UserDetails();
    
    Response.Cookies["UserID"].Path = "/";
    Response.Cookies["UserID"].Value = oUserDetails.UserID.ToString();
    FormsAuthentication.RedirectFromLoginPage(txtUserName.Value, chkPersistCookie.Checked);

    //oUserDetails = null;
  } 
  else {
    lblMsg.Text = "The information you provided does not match our database.";
  }
}

loadDetailsAfterLogin.aspx.cs

protected System.Web.UI.WebControls.Panel PanelMain;

private void Page_Load(object sender, System.EventArgs e)
{
  Response.Cache.SetCacheability(HttpCacheability.NoCache);

  if (!User.Identity.IsAuthenticated) 
  {
    Response.Redirect("~/Login.aspx");
  }

  UserDetails oUserDetails = new UserDetails();
  //UserDetails oUserDetails = UserDetails();

  PanelMain.Controls.Add(new LiteralControl("<table>"));
  PanelMain.Controls.Add(new LiteralControl("<tr><td>First Name : </td><td>" + oUserDetails.FirstName + "</td></tr>"));
  PanelMain.Controls.Add(new LiteralControl("<tr><td>Last Name : </td><td>" + oUserDetails.LastName + "</td></tr>"));
  PanelMain.Controls.Add(new LiteralControl("</table>"));

  oUserDetails = null;
}

Thanks in advance.

Re: loading user info after login from object

Christian Graus12-Mar-09 10:04

Christian Graus

12-Mar-09 10:04

liamderice wrote:

First Name : " + oUserDetails.FirstName + "
Last Name : " + oUserDetails.LastName + "

oUserDetails does not exist on this page, therefore you can't access it.

I suggest you learn some OO and C# first, then move on to ASP.NET.

Christian Graus

Driven to the arms of OSX by Vista.

Re: loading user info after login from object

liamderice12-Mar-09 10:31

liamderice

12-Mar-09 10:31

I had wondered that, but thought there might be a fancy new way of keeping the state of an object between pages in c#. Thanks.

Re: loading user info after login from object

Jörgen Andersson12-Mar-09 12:11

Jörgen Andersson

12-Mar-09 12:11

There are ways, but they're neither fancy nor are they new.
I suggest that you google
Asp.net request.querystring
Asp.net session
Asp.net Page State
for the most common methods to pass data between pages.

Re: loading user info after login from object

Christian Graus12-Mar-09 12:20

Christian Graus

12-Mar-09 12:20

Jorgens answer is correct. I'll just add - user info should go in the session, but for anything else, I'd write pages that load data from the db using a value on the querystring.

Christian Graus

Driven to the arms of OSX by Vista.

Re: loading user info after login from object

liamderice13-Mar-09 3:42

liamderice

13-Mar-09 3:42

Yeah, I'm used to doing this kinda thing with classic asp, but thought there might be something different as I moved to c#. Thanks for the advice guys.

in excel how to use mailmerge

sivapran12-Mar-09 9:24

sivapran

12-Mar-09 9:24

explain rhe mailmerge

Refresh of a seperate gridview in an ASP.NET page.

shawty_ds12-Mar-09 6:53

shawty_ds

12-Mar-09 6:53

Hi All,

I've been grappling with this for a few days now, and am no further forward, here's the scenario:

I have a page that contains the following

linqDataSource : productListDS (Selects * from products table)
GridView : gridProductList (Data source is productListDS)
linqDataSource : productDetailDS (Selects * from products table where id == id)
DetailsView : detailsProduct (Data source is productDetailDS)

The gridview lists all the products in the data source, with paging and select button enabled, when the select command is clicked the details view is then updated to show all the fields of the selected product and has the 'Edit', 'Insert' and 'Delete' commands enabled.

The gridView ONLY shows 5 columns from it's data source (The AutoGenerateColumns option is false) and i'm constructing the colums manually in the columns tag. I have the DataKeys set to id, and when i click the select button everything works flawlessly.

My problem comes when i do an Insert/Delete/Update.

As an example if i add a new record by putting the details form into insert mode, fill in the fields and then click insert, it inserts the record into the underlying SQLServer database, but the gridview does not update.

I've tried doing a 'gridProductList.DataBind()' in the page load, and in the details view 'ItemInserted' event, and still no luck. If however i browse away from the page, and then back the gridView then displays the newly added products. Even pressing F5 to force an update does not work, in fact all that achieves is to resubmit the last insert and add another new record to the DB.

The linq Data SOurce is connected to a LInqToSql DBML class.

Does anyone have ANY ideas on how to force the Grid View to update and show the table changes made using the details view without having to browse away from the page and then browse back.

Cheers

Shawty

Re: Refresh of a seperate gridview in an ASP.NET page.

Christian Graus12-Mar-09 9:35

Christian Graus

12-Mar-09 9:35

pingpingpong wrote:
I've tried doing a 'gridProductList.DataBind()' in the page load,

Page load runs before your events. So, you're binding before the insert. This is why browsing away and back works. Do your databinding in page prerender, always.

Christian Graus

Driven to the arms of OSX by Vista.

Re: Refresh of a seperate gridview in an ASP.NET page.

shawty_ds12-Mar-09 12:57

shawty_ds

12-Mar-09 12:57

Thanks Christian,

I'll look into that, one more question...

Does ths even apply when i'm not doing the original databinding manually, i'm just letting the datasource/datagrid sort it out them selves. Calling the DataBind() proc just seemed like a sensible thing to try to force it to update.

Re: Refresh of a seperate gridview in an ASP.NET page.

shawty_ds12-Mar-09 13:06

shawty_ds

12-Mar-09 13:06

Christian, thanks.... that worked excellently. Smile | :)

byte[] to string

M.Ambigai12-Mar-09 6:43

M.Ambigai

12-Mar-09 6:43

sir,
Just to encrypt a string, i used this code.
code:
public string encryptText(string plaintext,string passpharse,string saltValue,string hashAlgorithm,int passwordIterations,string initvector,int keysize)
{
byte[] InitVectorBytes = Encoding.ASCII.GetBytes(initvector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
byte[] plaintextbytes = Encoding.ASCII.GetBytes(plaintext);
PasswordDeriveBytes password = new PasswordDeriveBytes(passpharse, saltValueBytes, hashAlgorithm, passwordIterations);
byte[] keyBytes = password.GetBytes(keysize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, InitVectorBytes);
MemoryStream memorystream = new MemoryStream();
CryptoStream cryptostream = new CryptoStream(memorystream, encryptor, CryptoStreamMode.Write);
cryptostream.Write(plaintextbytes, 0, plaintextbytes.Length);
cryptostream.FlushFinalBlock();
byte[] ciphertextbytes = memorystream.ToArray();
memorystream.Close();
cryptostream.Close();
string ciphertext = Convert.FromBase64String(ciphertextbytes);

return ciphertext;
}
I've got the following errors:

Error 1 The best overloaded method match for 'System.Convert.FromBase64String(string)' has some invalid arguments.54,29
Error 2 Argument '1': cannot convert from 'byte[]' to 'string'.54,54

Please help me to resolve it.

Re: byte[] to string

shawty_ds12-Mar-09 6:57

shawty_ds

12-Mar-09 6:57

You've declared ciperTextBytes as a byte array, when it needs to be a string.

ConvertFromBase64String(string) is telling you that you need to pass the parameter to it as a string data type.

I'm not 100% sure with out testing it, but

string ciphertext = Convert.FromBase64String(ciphertextbytes.ToString()); !!MIGHT!! work.

Cheers

Shawty

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