Problem: Quirky Problem with Javascript OnClick chaining - Server code executed | Client code ignored (C# 3.5) - ASP.NET Discussion Boards

hi, iam using asp.net with c#

above the gridview iam using a textbox , when user enters the name of category the related records should be pop up in gridview control

can you give me a suitable example which helps me

Change your TextBox to a DropDownList
Create a StoredProcedure that will return you a listing of Categories from your Category reference table
Transform the raw data into a List of KeyValuePairs with your category DisplayNames and your Database Values,
Set the DataSource of your DropDownList to the List<KeyValuePair<string,string>> where each KeyValuePair represents an individual category,
DropDownList.DataBind();
Trigger a postback on Category Selection,
Send the category down to your Stored Procedure as a parameter,
Pull back data,
perform ORM,
set the DataSource of your GridView to a List of your Business Objects
GridView.DataBind();

Done

Quick and dirty, typed in-line off top of head:

public List<KeyValuePair<string, string>> GetCategories()
{
     //Pseudo-Code
     //Open Database Connection
     //Create a command of type StoredProcedure
     //Tell the command which stored procedure to execute (preferrably, your "GetCategories() SP)
     List<KeyValuePair<string,string>> categories = new List<KeyValuePair<string,string>>();
     while(reader.Read())
     {
           categories.Add(new KeyValuePair<string,string>(reader["CategoryName"],reader["categoryID"].ToString());
     }
 return categories;
}

public List<BusinessObject> GetData(int category)
{
     //Pseudo-Code
     //Open Database Connection
     //Create a command of type StoredProcedure
     //Tell the command which stored proc to execute (preferrably, the one that "Gets Data")
     //Send category down to Stored Proc as a parameter
     List<BusinessObject> list = new List<BusinessObject>();
     while(reader.Read())
     {
          list.Add(new BusinessObject(reader["id"],reader["blahdeblah"],reader["whateverotherfieldyouwanttomap"]);
     }
     return list;
}


protected void Page_Load(object sender, EventArgs e)
{
   if(!Page.IsPostBack)
   {
      grdData.DataSource = GetData();
      grdData.DataBind();
      ddlCategories.DataSource = GetCategories();
      ddlCategories.DataTextField = "Key";
      ddlCategories.DataValueField = "Value";
      ddlCategories.DataBind();
   }
}

"I need build Skynet. Plz send code"

hi iam using asp.net with c#

in my gridview control 1st column is checkbox,2nd column is product name, 3rd column is price, 4th column is quantity

5th column is total, when user enters the quantity value then price* quantity and the result should be display dynamically in total column

can you provide me a suitable example which helps me

if you're wanting to perform the calculation yourself, and it needs to be done on the fly as data is being entered.....javascript.

"I need build Skynet. Plz send code"

hi iam using asp.net with c#

in my gridview control 1st column is checkbox,2nd column is product name, 3rd column is price, 4th column is quantity

5th column is total, when user selects any no of checkbox that selected row data i have to take it to another page in which

there is also an another gridview i have show the data from previous page

can you provide me a suitable example which helps me

Well...to pass data from one page to another, you are going to have to have some way of persisting the relevant information between pages because web development is inherently stateless.

The most common methods for passing data from form to form would be:
->Session,
->ViewState,
->QueryString.

I suggest you begin by investigating these three mechanisms.

Then, figure out how to bind a GridView to data that you pull out of your chosen variable. Then, figure out how to put data from the original GridView into the variable. If you can combine these three tasks, you will be able to pass data from GridView to GridView.

"I need build Skynet. Plz send code"

Take data into session and print onto next page
2-through previous page control
for more information
jayprakash.554@gmail.com
09999379707
in india

Hi everybody,
I'm running into some very weird (to me) behavior when I try to chain the OnClick event of a Label to an Anchor. If that isn't self-explanatory, what I'm doing is showing a Label and hiding an Anchor. When I click on the Label, the Label clicks the Anchor.

My debugging process:
-> If I hide the Label, Show the anchor and set the function directly in the OnClick event in the a tag, executes as expected

-> If I show the Label, Hide the anchor and set the function directly in the OnClick event in the asp:label tag, executes as expected

-> If I show the Label, Hide the anchor, set the function in the anchor tag and tie the Label's OnClick event to be the PostBackClientHyperlink of the anchor, the javascript function is not executed.

Clicking the Label is triggering a PostBack, but it is not executing the client-side onclick event before doing so.
I've included the relevant code below. Does anyone have enough experience in this area to know why the Anchor's onclick event is not chained to the Label?

Page Markup

<table width="82px" cellspacing="1" cellpadding="0" bgcolor="#99BADD" runat="server">
            <tr runat="server">
                <td runat="server">
                    <table width="80px" cellspacing="0" cellpadding="0" runat="server">
                     <tr runat="server">
                        <td id="trace" bgcolor="#FFFFFF" width="80px" height="16px"  runat="server">
                            <asp:Label runat="server" visible="false" ID="lblTrace" BackColor="#99BADD" >Trace1</asp:Label>
                            <a id="hdnAnchor" visible="true" runat="server" onclick="return poop();" >Trace2</a>
                        </td>
                     </tr>
                    </table>
                </td>
            </tr>
        </table>

JavaScript function (assume that "txtSuccess" exists on the Page)

function poop()
{
document.getElementById('txtSuccess').value = "PooP";
}

Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    lblTrace.Attributes.Add("OnClick",ClientScript.GetPostBackClientHyperlink(this.hdnAnchor, ""));
}

"I need build Skynet. Plz send code"

Message Removed

Sure, do you have about five years to listen, observer and learn it?

I know the language. I've read a book. - _Madmatt

Here you go

"I need build Skynet. Plz send code"

Sorry man,
Unfortunately, this is a big issue that cannot be answered on a forum
I suggest that you buy a good book in oop
Or join a course

Then, you can find a list of very useful articles here on CodeProject that provides samples for beginners and some tricks, etc.

The message board will be useful for you only when you are developing some application and have a specific issue

However, welcome to CodeProject

foreach(Minute m in MyLife)
myExperience++;

Hi all,

I am trying to code a procedure in VB.Net where a user clicks on a link and the page detects the email of the person. This way I will be able to validate that it is a new user who has accessed the activation aspx page.

Currently, I have the follwing:

IF Request.QueryString("uid") > 0 THEN<br />
'activate user<br />
ELSE<br />
'display error message<br />
END IF

I can also query the DB to see if the userID is > 0 AND if the activation status is false, but it is still not specific enough. If I can include his EMAIL ADDRESS in the query, I will have solved the issue.

Thanks for your help!

Well because your user might have a browser but not an email client or multiple registered emails, there's no linkage between machine and email address or browser and email address so you're basically going to have to add another variable to your querysting to include their registered email (I'm assuming your link is sent out via mail a la a forum registration message).

Thanks for the answer! I see what you mean.. query the email that they input and send it to his email.. when it arrives back to the application, it will be there ready for me to query!

Sometimes the solution is soo simple!

Thanks again Big Grin | :-D

My only extension would be to encrypt the value on the way out and then decode it in your page's code when they come back. Just because someone might mess around with the URL, randomly entering IDs and email combinations.

It's unlikely I'll admit but it's just one of those things I end up doing just for peace of mind.

Good Call.. I will do that.. I shall use an encryption algorithm.

Thanks!

i've declared a variable "i" in javascript in aspx file...now i want to retrieve its value in .cs file....also i've to provide the value of "i" from .cs file only.....how can we do it????

Could you outline the scenario please?
Javascript is client side, C# is server. You -can- pass back the value to the server using a postback or async but C# cannot simply grab a value set in client side javascript.

cs on the server ..
javascript on the client browser ...

declared every asp.net control with an ID that when you postback your page will display the result
is this what you are looking for ?

mydevbank.com

Create an ASP:HiddenField control. Set the value of that control in javascript. If you have lots of nested controls you may have to use the <%#yourHiddenCtrlName.ClientID%> trick to get the client side ID to use when setting it in javascript.

when partial postback is happen then accessing data from viewstate is getting problem. it is giving error like
"threw an exception of type 'System.NullReferenceException".

here i giving a small sample code by which anyone can undersdtand what i am trying to do

ASPX Page
-----------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script type="text/ecmascript">
function ReceiveServerData(rValue)
{
document.getElementById("ResultsSpan").innerHTML = rValue;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID=btn1 runat=server Text="Button1" OnClientClick="CallServer('btn1', '');" />
<asp:Button ID=btn2 runat=server Text="Button2" OnClientClick="CallServer('btn2', '');"/>
<div id="ResultsSpan"></div>
</div>
</form>
</body>
</html>

Code Page
-----------
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page ,ICallbackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsCallback)
{
String cbReference =
Page.ClientScript.GetCallbackEventReference(this,"arg", "ReceiveServerData", "context");

String callbackScript;
callbackScript = "function CallServer(arg, context)" + "{ " + cbReference + ";}";
Page.ClientScript.RegisterClientScriptBlock(this.GetType(),"CallServer", callbackScript, true);
}
}

public void RaiseCallbackEvent(String eventArgument)
{
//threw an exception of type 'System.NullReferenceException
if (vwValue == "")
{
vwValue = "Hello";
}
}

public String GetCallbackResult()
{
return vwValue;
}

public string vwValue
{
get
{
if (ViewState["dt"] != null)
return ViewState["dt"].ToString();
else
return "";
}
set
{
ViewState["dt"] = value;
}
}

}

first time i assing value to viewstate when callback happen and when again callback happen then i am not getting anyvalue in viewstate which
i have stored in first call back. i just can not understand why it is happening. please help me to understand the problem and also show me the
way i can persist value in viewstate accross multile callback. please help me with a small sample code.

thanks in advance.

tbhattacharjee

Please edit your post and use the pre tags to format the code and markup

I know the language. I've read a book. - _Madmatt

U had suggested me to right click on the image and check the path. I had tried it but it didnt work.
My prog is running on local host so the num ber keeps changing so how can i run the program.
this was the path which was poping up on selecting the image.
Friends please help me .
http://localhost:49216/ws/App_Data/pics/pic1.jpg
In asp.net this is the coding which i have provided

asp:TableCell ID="TableCell4" ColumnSpan ="2" VerticalAlign = "Top" HorizontalAlign ="Center" runat ="server">
<asp:image id="Image1" runat="server" imageurl="../../../../../App_Data/pics/pic1.jpg">

sowjanya3 wrote:
ImageUrl="../../../../../App_Data/pics/pic1.jpg" />

Why are you making the path relative to the page it's on instead of relative to the root of your application?

i.e.

File A is at <project root="">\images\a.jpg
So in your ImageURL you make it referenced as "/images/a.jpg"

Edit: Also your thread title is misleading. This has nothing to do with IIS or using regiis.

modified on Thursday, April 1, 2010 6:04 AM