Develop Reference

hiding div element in code behind

I have built a slideshow. Each of the slides has a div placed over the top of it. The div contains some text. What I want to do is if the h2 and p element have no text then hide the div that contains them. I have attempted to hide the div from the repeaters DataBound event but it is still showing the div over the slide.
Here's what I have so far:
aspx:
<asp:Repeater ID="rptSlides" runat="server" ClientIDMode="Static" OnItemDataBound="rptSlides_ItemDataBound">
<ItemTemplate>
<div runat="server" id="slideDiv" class="slide">
<img runat="server" src='<%# Eval("slideImgPath")%>' />
<div id="slideTextdiv" runat="server" class="slideText">
<h2 id="titlePlaceHolder" runat="server" class="slideTitle text-center text-capitalize h2 ">
<%# Eval("slideTitle") %>
</h2>
<p id="textPlaceHolder" runat="server" class="slideDes">
<%# Eval("slideDesc") %>
</p>
</div>
</div>
</ItemTemplate>
</asp:Repeater>
Code behind:
protected void rptSlides_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
foreach (RepeaterItem item in rptSlides.Items)
{
HtmlGenericControl titleText = (HtmlGenericControl)item.FindControl("titlePlaceHolder");
HtmlGenericControl slidetextDesc = (HtmlGenericControl)item.FindControl("textPlaceHolder");
HtmlGenericControl slideDiv = (HtmlGenericControl)item.FindControl("slideTextdiv");
if (titleText.InnerText == "" && slidetextDesc.InnerText == "")
{
slideDiv.Style.Add("Display", "none");
}
}
}
Further info
I have also tried the following:
foreach (RepeaterItem item in rptSlides.Items)
{
HtmlGenericControl slideDiv = (HtmlGenericControl)FindControlRecursive(item, "slideTextdiv");
HtmlGenericControl titleText = (HtmlGenericControl)FindControlRecursive(item, "titlePlaceHolder");
HtmlGenericControl slidetextDesc = (HtmlGenericControl)FindControlRecursive(item, "textPlaceHolder");
if (string.IsNullOrWhiteSpace(titleText.InnerText) && string.IsNullOrWhiteSpace(slidetextDesc.InnerText))
{
slideDiv.Attributes["class"] = "emptySlideText";
}
}
I created a class in the css called emptySlideText, like so:
.emptySlideText {
display:none; }
Unfortunatley this has had no effect.
I have also tried changing the line
slideDiv.Style.Add("Display", "none");
to
slideDiv.Attributes.Add("style", "display:none");
But again it made no difference

First of all you don't need a foreach loop inside your rptSlides_ItemDataBound event as ItemDataBound event of a repeater control iterates for each item. Next Div is not a HtmlGenericControl control rather it is HtmlControl control. Once you have this you can hide the div using Visible property like this:-
protected void rptSlides_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
{
HtmlControl slideTextdiv = (HtmlControl)e.Item.FindControl("slideTextdiv");
HtmlGenericControl titlePlaceHolder = (HtmlGenericControl)e.Item.FindControl("titlePlaceHolder");
HtmlGenericControl textPlaceHolder = (HtmlGenericControl)e.Item.FindControl("textPlaceHolder");
if (titlePlaceHolder != null)
titlePlaceHolder.InnerText = Regex.Replace(titlePlaceHolder.InnerText, #"\r\n?|\n", "").Trim();
if (textPlaceHolder != null)
textPlaceHolder.InnerText = Regex.Replace(textPlaceHolder.InnerText, #"\r\n?|\n", "").Trim();
if (String.IsNullOrEmpty(titlePlaceHolder.InnerText) && String.IsNullOrEmpty(textPlaceHolder.InnerText))
{
slideTextdiv.Visible = false;
}
}
}
Please include using System.Text.RegularExpressions; to import Regex class.

must have an IF in my Repeater

This is how I will find out about my like a true or false, and I will do my Repeater.
If my like is false then the display content. but if it is true then the display content on the page.
Right now makes this error:
Databinding methods such as Eval(), XPath(), and Bind() can only be
used in the context of a databound control.
<asp:Repeater ID="RepeaterReport" runat="server">
<ItemTemplate>
<%--I have much more different content here.--%>
<% if (Convert.ToBoolean(Eval("like")) != true)
{ %>
<a href="../mentor/report.aspx?like=<%# Eval("IdBesked") %>" class="btn btn-success mr-xs mb-sm">
<i class="fa fa-thumbs-up"></i>Synes godt om
</a>
<% } %>
<%--I have much more different content here.--%>
</ItemTemplate>
</asp:Repeater>
Error are here:
<% if (Convert.ToBoolean(Eval("like")) == false) {%>
Select data:
var MentorBeskedReport = from mb in db.MentorBeskeds
where mb.Id == beskedId && mb.Til_BrugerId == Helper.ReturnBrugerId() && mb.godkendt == true && mb.opretdato < months
select new
{
IdBesked = mb.Id,
Navn = mb.brugere.fornavn + " " + mb.brugere.efternavn,
dag = mb.opretdato,
tekst = mb.tekst,
like = mb.like // Bit in database TRUE/FALSE
};
if (MentorBeskedReport != null)
{
//Report
RepeaterReport.DataSource = MentorBeskedReport.ToList().OrderByDescending(i => i.IdBesked);
RepeaterReport.DataBind();
}

The problem is that you're using the Eval method inside an if statement.
You should change your a tag to runat=server and give it an ID. Then, instead of doing the validation inside your .aspx file, you should add an ItemDataBound event and check it on .aspx.cs:
<asp:Repeater ID="RepeaterReport" ItemDataBound="RepeaterReport_ItemDataBound" runat="server">
<ItemTemplate>
<a id="myAnchor" runat="server" href="../mentor/report.aspx?like=<%# Eval("IdBesked") %>" class="btn btn-success mr-xs mb-sm">
<i class="fa fa-thumbs-up"></i>Synes godt om
</a>
</ItemTemplate>
</asp:Repeater>
public void RepeaterReport_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
if (Convert.ToBoolean(DataBinder.Eval(e.Item.DataItem, "like")) != true)
{
((HtmlControl)e.Item.FindControl("myAnchor")).Visible = false;
}
}
}

How to Get Count of Items in Repeater inside ItemDataBound

I have one Repeater
<asp:Repeater runat="server" ID="rptID" OnItemDataBound="repID_ItemDataBound">
<ItemTemplate>
<a href='example.com/somepage.aspx' id="myLink">
<%# Eval("MyVal")%>
</a>
</ItemTemplate>
</asp:Repeater>
In Code Behind I need to add one css class for this <a> tag when in repeater is one
Item
protected void repID_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
//how to set this class only then count of items is equal with 1
((HtmlGenericControl)e.Item.FindControl("myLink")).Attributes
.Add("class", "Count1");
}
}

This will give you the count of your datasource items:
if (((IEnumerable)rptID.DataSource).Cast<object>().Count() == 1)
{
((HtmlGenericControl)e.Item.FindControl("myLink")).Attributes
.Add("class", "Count1");
}
Counting the IEnumerable was borrowed from this thread: Calculating Count for IEnumerable (Non Generic)

Nested repeater not being triggered

I have three repeaters with a parent child relationship (so we have a parent repeater, and child repeater, and a child-child repeater) with the inner-most repeater not being triggered. here is my aspx page for the layout:
<asp:Repeater ID="rptMission" runat="server">
<HeaderTemplate>
<ul id="acc1" class="ui-accordion-container">
</HeaderTemplate>
<ItemTemplate>
<li>
<div class="ui-accordion-left"></div>
<a class="ui-accordion-link acc1"><%# Eval("Name") %><span class="ui-accordion-right"></span></a>
<div>
<ul class="ui-accordion-container" id="acc2">
<asp:Repeater ID="rptActivity" runat="server">
<ItemTemplate>
<li>
<div class="ui-accordion-left"></div>
<a class="ui-accordion-link acc2"><%# Eval("Name") %>
<span class="ui-accordion-right"></span></a>
<div>
<asp:Repeater ID="rptProject" runat="server">
<ItemTemplate>
<%# Eval("Name") %><br/>
</ItemTemplate>
</asp:Repeater>
</div>
</li>
</ItemTemplate>
</asp:Repeater>
</ul>
</div>
</li>
</ItemTemplate>
<FooterTemplate>
</ul>
</FooterTemplate>
</asp:Repeater>
The top two repeaters work great but the 'rptProject' repeater doesn't get triggered. Here is my code behind:
protected void Page_Load(object sender, EventArgs e)
{
_presenter = new TierTypesPresenter(this);
rptMission.ItemDataBound += new RepeaterItemEventHandler(rptMission_ItemDataBound);
RaiseStartUp();
}
void rptMission_ItemDataBound(Object sender, RepeaterItemEventArgs e)
{
RepeaterItem item = e.Item;
Mission row = (Mission)item.DataItem;
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
{
var rptActivity = (Repeater)item.FindControl("rptActivity");
var activity = _presenter.GetActivitiesByMission(row.Id);
rptActivity.DataSource = activity;
rptActivity.DataBind();
}
}
void rptActivity_ItemDataBound(Object sender, RepeaterItemEventArgs e)
{
RepeaterItem item = e.Item;
Activity row = (Activity)item.DataItem;
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
{
var rptProject = (Repeater)item.FindControl("rptProject");
var project = _presenter.GetProjectsByActivities(row.Id);
rptProject.DataSource = project;
rptProject.DataBind();
}
}
public void SetMissions(IEnumerable<Mission> missionList)
{
rptMission.DataSource = missionList;
rptMission.DataBind();
}
If I could trigger the second ItemDataBound event 'rptActivity_ItemDataBound' I think it would work fine but it gets skipped over. Thanks for any insight!

I solved my problem by putting the third repeater binding into the second repeaters ItemBoundEvent. Here is the updated code for any interested:
void rptMission_ItemDataBound(Object sender, RepeaterItemEventArgs e)
{
RepeaterItem item = e.Item;
Mission row = (Mission)item.DataItem;
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
{
var rptActivity = (Repeater)item.FindControl("rptActivity");
var activity = _presenter.GetActivitiesByMission(row.Id);
var i = 0;
foreach (Activity data in activity)
{
RepeaterItem activityItem = rptActivity.Items[i];
var rptProject = (Repeater)activityItem.FindControl("rptProject");
var project = _presenter.GetProjectsByActivities(data.Id);
rptProject.DataSource = project;
rptProject.DataBind();
i++;
}
rptActivity.DataSource = activity;
rptActivity.DataBind();
}
}

I guess you are missing this line of code:
rptActivity .ItemDataBound += new RepeaterItemEventHandler(rptActivity_ItemDataBound);
It is easier to set the events in the asp file by the way...

Go Through All The Rows of DataList Control on Button Click

I need to check every row of a datalist on a button click to check if the checkbox inside the each row is checked or not. I put my buttons inside the FooterTemplate of the DataList but I couldn't find a way yet. This is my ItemCommand method;
protected void DataList1_ItemCommand(object sender, DataListCommandEventArgs e) {
if (e.Item.ItemType == ListItemType.Footer) {
if (e.CommandName == "AddContinue") {
} else if (e.CommandName == "SkipContinue") {
}
}
}
here is my footer;
<FooterTemplate>
<div class="top-margin-25">
<div class="left-floathy">
<asp:Button runat="server" ID="btnPreviousStep" Text="<<< Previous Page"
class="blueButtonSmall boxShadow" onclick="btnPreviousStep_Click" />
</div>
<div class="right-floathy">
<asp:Button runat="server" ID="btnAddContinue" Text="Add & Contuniue >>>"
class="blueButtonSmall boxShadow" CommandName="AddContinue" /><br />
</div>
<div class="clarFix"></div>
<div class="right-floathy">
<asp:Button runat="server" ID="btnSkipContinue" Text="Skip & Continue >>>"
class="blueButtonSmall boxShadow" CommandName="SkipContinue" />
</div>
<div class="clarFix"></div>
</div>
</FooterTemplate>

Ok, apparently I was a little careless for not seeing DataList.Items thing. Answer is sitting here;
http://blog.ysatech.com/post/2011/06/03/ASPNET-Get-selected-checkbox-value-in-DataList.aspx
EDIT
For others who has the same problem, here is the code;
protected void DataList1_ItemCommand(object sender, DataListCommandEventArgs e) {
if (e.Item.ItemType == ListItemType.Footer) {
if (e.CommandName == "AddContinue") {
foreach (DataListItem item in DataList1.Items) {
CheckBox extraCheck
= item.FindControl("extraCheck") as CheckBox;
if (extraCheck != null) {
if (extraCheck.Checked) {
Response.Write(item.ItemIndex);
}
}
}
} else if (e.CommandName == "SkipContinue") {
}
}
}