Develop Reference

Check if hyperlink in gridview has been clicked c#

Hi I would like to know how to get the text field and index from a hyperlink in a gridview that has been clicked. Basically, the user would click on the hyperlink in the gridview and when the user has been navigated to the link, the text field and index of the link would be stored into an arraylist. Does anyone have any idea how I can go about doing this?
I have came up with this "pseudo code" for the onrowdatabound event handler in gridview:
ArrayList linksClicked = new ArrayList();
if (e.Row.RowType == DataControlRowType.DataRow)
{
HyperLink hl = (HyperLink)e.Row.FindControl("links");
if (hl != null)
{
linksClicked.Add(h1.ToString());
}
}

You should use ItemTemplate with LinkButton. In this button you can keep index or id like CommandArgument, also you easily catch event onClick and add index to your array. Use this sample.
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="hyperLinkButton" Text="link" PostBackUrl="youruri.com" runat="server"
CommandArgument="<%# Eval("SomeFieldYouNeedArguementFrom") %>" OnClick="hyperLinkButton_Click" >
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
protected void hyperLinkButton_Click(object sender, EventArgs e)
{
LinkButton btn = (LinkButton)(sender);
string yourValue = btn.CommandArgument;
// do what you need here
}

ImageButton open link in new page within Repeater

I have the below Image Button which resides in a Repeater:
<asp:ImageButton PostBackUrl='<%# DataBinder.Eval(Container.DataItem, "VesselId", "getattachment.do?VesselId={0}") %>' CausesValidation="false" ID="insurancestatus" runat="server"/>
So every time the user clicked on the button they were shown their attachment.
The requirement has since changed, and the attachment must open on a new page so I added the following to the Repeaters ItemDataBound event:
ImageButton imagebuttonInsurance = (ImageButton)e.Item.FindControl("insuranceStatus");
imagebuttonInsurance.OnClientClick = String.Format("aspnetForm.target = '_blank'; return true()");
Now when I click on the image it does open another page but it just reloads the previous page on the new page. I tried removing the PostBackUrl and wiring up the following click event:
protected void insurancestatus_Click(object sender, ImageClickEventArgs e)
{
Vessel vessel = (Vessel)e.Item.DataItem;
Response.Redirect(String.Format("~/Secure/getattachment.do?VesselId={0}", vessel.VesselId));
}
But I couldn't get a handle on the item so cannot use the VesselId for the link, where am I going wrong here?

Use the second method, but use the command argument property like:
<asp:imagebutton runat=server...... commandargument='<%# Eval("vesselid") %>' />
then:
protected void insurancestatus_Click(object sender, ImageClickEventArgs e)
{
string vesselId = ((ImageButton)sender).CommandArgument;
Response.Redirect(String.Format("~/Secure/getattachment.do?VesselId={0}", vesselId));
}

codebehind is not setting CssClass on a link button in a repeater

New to webforms/c# I get a reference to the object in the onclick handler.
The reference to the object exists in the Repeater_ItemDataBound method.
After the curObj.CssClass = "XXXXX" has run the class object curObj is updated.
The page renders without the CSS class applied to the object.
I assume this is due to the LinkButton CSS does not apply to the Anchor tag that gets rendered in the end.
So how do I apply the CSS class to the actual rendered Anchor from the code behind?
// my aspx
<asp:Repeater ID="Repeater1" runat="server" onItemDataBound="Repeater_ItemDataBound">
<ItemTemplate>
<asp:LinkButton ID="my_btn" runat="server" OnCommand="cmdSelect_click" CommandArgument='<%# Eval("value") %>'><%# Eval("value") %></asp:LinkButton>
</ItemTemplate>
</asp:Repeater>
// my code behind
protected void Repeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (((MyObject)e.Item.DataItem).value == CurrentValue )
{
curObj.CssClass = "someCssClassHere";
}
}
protected LinkButton curObj;
protected void cmdSelect_click(object sender, CommandEventArgs e)
{
curObj = (LinkButton)sender;
CurrentValue = int.Parse(e.CommandArgument.ToString())-1;
}

I dont understand when/where you want to set cssclass..
If you want to set it in ItemDataBound:
protected void Repeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
LinkButton my_btn = (LinkButton)e.Item.FindControl("my_btn");
if (my_btn != null) my_btn.CssClass = "someCssClassHere";
}
or if you want to set after Click:
protected void cmdSelect_click(object sender, CommandEventArgs e)
{
LinkButton my_btn = (LinkButton)sender;
my_btn.CssClass = "someCssClassHere";
}

That's not quite how templated controls such as the Repeater work.
Firstly, you should do a FindControl inside ItemDataBound to find your LinkButton, and apply the CSS to the item that is found.
Secondly, you don't wire up events for controls inside a Repeater that way; instead you handle the ItemCommand event of the Repeater.
Can you post the code you're using to bind the repeater ? It would be useful to know what your DataSource is, then I can post something that works.
This post might help as well - Linkbutton inside Repeater for paging ASP.Net

My checkbox on the gridview doesn't trigger an event

I created my gridview with checkboxes inside of it with this code.
<asp:GridView ID="GridView1" runat="server" Width="366px" autogeneratecolumn="false">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="SelectAllCheckBox" runat="server" AutoPostBack="true" oncheckedchanged="SelectAllCheckBox_OnCheckedChanged" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="EachCheckBox" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I tried check/uncheck it.
enter link description here
protected void SelectAllCheckBox_OnCheckedChanged(object sender, EventArgs e)
{
String test = "test";
test = "newtest";
GridView1.DataSource = null;
GridView1.DataBind();
}
But it doesn't trigger any event.
enter link description here
I'm trying to find where my code is missing and searched so far but still can't.
Thank you for your help!

You must use OnItemCreated or OnItemDataBound and link your checkbox with your delegate
void Item_Created(Object sender, DataGridItemEventArgs e)
{
CheckBox cbx = (CheckBox)e.Item.FindControl("SelectAllCheckBox");
cbx.CheckedChanged += SelectAllCheckBox_OnCheckedChanged;
}

The code looks fine and works for me.
I suspect you might be binding the GridView on every postback.
When you click the CheckBox with the event attached it causes the page to refresh. If you bind the CheckBox on Page_Load (or any method that occurs on every trip to the server) it will bind the grid every time you click the CheckBox. In this case it will never get as far as firing your event.
If so, try checking for a postback before binding your GridView.
For example:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Gridview1.DataSource = myDataSource;
GridView1.DataBind();
}
}

On ASP.NET ListView with LinqDataSource, display the data when the search button clicked

I have a ListView setup with LinqDataSource and a button that triggers search function. To avoid display data on page_load, I set ListView's DataSourceID in the Click event of the search button, bind it and set result data in LinqDataSource's Selecting event. It works as I expected but It does't look pretty to set DataSourceId in the button Click event every time the search button is clicked. How can I do this in a better and clearer way?
ASPX code:
<asp:LinqDataSource ID="LinqDataSource1" runat="server"
ContextTypeName="WebApplication1.DataClasses1DataContext" EntityTypeName=""
TableName="Persons" onselecting="LinqDataSource1_Selecting">
</asp:LinqDataSource>
<asp:ListView ID="ListView1" runat="server" >...</asp:ListView>
<asp:Button ID="Search" Text="Search" runat="server" Click="Search_Clicked"/>
ASPX.CS code:
protected void Search_Clicked(object sender, EventArgs e)
{
ListView1.DataSourceID = LinqDataSource1.ID;
ListView1.DataBind();
}
protected void LinqDataSource1_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
//Search Criteria from CheckBoxList and TextBox applied here.
DataClasses1DataContext data = new DataClasses1DataContext();
var query = from result in data.Persons
where result.ID > 2
select result;
e.Result = query;
}

I honestly don't see anything wrong with your approach, however, if you don't like it, an alternate approach would be to just statically set the DataSourceID in your ListView markup as usual, but set Visible="False", and only make it visible once the button has been clicked.