Product version 9.1.2.
I am writing an event handler for the BeforePopup event for an Xtrabars.PopupMenu. I would like to disable certain items and was following this approach I found on the DevExpress support forum.
private void popupMenu1_BeforePopup(object sender, System.EventArgs e) {
(sender as DevExpress.XtraBars.PopupMenu).ItemLinks[1].Item.Enabled = ! (sender as DevExpress.XtraBars.PopupMenu).ItemLinks[1].Item.Enabled;
}
In the event handler I get the XtraBars.PopupMenu sender object and then access the links via the ItemLinks property as shown above. ItemLinks returns an object of type PopupMenuItemLinkCollection. But this object is unindexable. I can find no documentation on PopupMenuItemLinkCollection.
How can I access the items in the PopupMenuItemLinkCollection?
I am able to get the indexing via client side code.
1) Assign menu with some id (ex : ID="menu")
2) Make a client side code as
<ClientSideEvents ItemClick="OnMenuItemClick" />
3)
function OnMenuItemClick(){
var item = menu.GetSelectedItem();
}
item will provide you the index of current menu selected.
I found the method 'get_Item' that allows me to access the items in the collection:
links.get_Item(0)
Related
Summary: When trying to hide a custom command button in ASPxGridView command column, it hides the buttons strangely, one of the buton texts appears in the filter row entry, and the button handlers stop working. The error message like "More controls with the DXCBtn_0_9_-1 were found. The FindControl requires unique identifiers of the controls" (loosely translated) appeares.
I am using DevExpress 14.2.3.0, the grid view is nested in another grid views and in ASPxRoundPanels.
Details: The command column contains the following custom buttons...
<dx:GridViewCommandColumn VisibleIndex="9">
<CustomButtons>
<dx:GridViewCommandColumnCustomButton ID="btnClose" Text="Close as done">
</dx:GridViewCommandColumnCustomButton>
<dx:GridViewCommandColumnCustomButton ID="btnReopen" Text="Reopen">
</dx:GridViewCommandColumnCustomButton>
</CustomButtons>
</dx:GridViewCommandColumn>
The buttons are displayed fine (as links) and the following code handles them nicely:
protected void gvMilestoneTasks_CustomButtonCallback(object sender, ASPxGridViewCustomButtonCallbackEventArgs e)
{
ASPxGridView grid = sender as ASPxGridView;
if (e.ButtonID == "btnClose")
{
int milestoneID = Convert.ToInt32(grid.GetRowValues(e.VisibleIndex, "ID"));
DbUtil.ExecuteNonQuery(String.Format("EXEC sp_milestone_tasks_close_open {0}, 0, N'{1}'",
milestoneID, Page.User.Identity.Name));
grid.DataBind();
} else if (e.ButtonID == "btnReopen")
{
int milestoneID = Convert.ToInt32(grid.GetRowValues(e.VisibleIndex, "ID"));
DbUtil.ExecuteNonQuery(String.Format("EXEC sp_milestone_tasks_close_open {0}, 1, N'{1}'",
milestoneID, Page.User.Identity.Name));
grid.DataBind();
}
}
(That is, dedicated SQL stored procedures with different arguments are called [notice the second argument if curious], and the grid.DataBind(); is used to refresh the content of the status column.)
I want to show only one of the buttons. When the row shows the open one, only the Close button should be displayed and active. When the row shows it was closed earlier, only the Reopen button should be visible and active.
I tried to handle visibility in the CustomButtonInitialize event handler (based on the status info -- when the closed is NULL in the database, then it is open; otherwise, the closed contains the datetime of when it was closed):
protected void gvMilestoneTasks_CustomButtonInitialize(object sender, ASPxGridViewCustomButtonEventArgs e)
{
if (e.VisibleIndex == -1)
return;
ASPxGridView grid = sender as ASPxGridView;
if (e.ButtonID == "btnClose")
{
object o = grid.GetRowValues(e.VisibleIndex, "closed");
bool flagVisible = Convert.IsDBNull(o);
e.Visible = flagVisible ? DefaultBoolean.True : DefaultBoolean.False;
}
else if (e.ButtonID == "btnReopen")
{
object o = grid.GetRowValues(e.VisibleIndex, "closed");
bool flagVisible = !Convert.IsDBNull(o);
e.Visible = flagVisible ? DefaultBoolean.True : DefaultBoolean.False;
}
}
I can observe also an error message in the browser in the sense "More controls with the DXCBtn_0_9_-1 were found. The FindControl requires unique identifiers of the controls" (loosely translated) -- this is hidden somewhere deep in the controls; I am not using the FindControl.
Where is the bug hidden?
Thanks for your help.
I think this is a DevExpress bug fixed in version 2014 2.5:
Fix
The reason is that FilterRow behaves as another row of the displayed grid. It is considered to be another visible row. This way the handler should return early also in the case when the cell type is detected as filter.
if (e.VisibleIndex == -1 || e.CellType == GridViewTableCommandCellType.Filter)
return;
Alternatively, that part can be changed to...
if (e.CommandCellType != GridViewTableCommandCellType.Data)
return;
I am trying to replace my listbox without data binding for a LongListSelector with data binding.
The problem I am facing (since I'm new with this) I don't find a good example how to implement properly the LongListSelector Jumplist with data binding that according to the item choose navigates to different pages.
I followed this example: http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj244365(v=vs.105).aspx#BKMK_AddingLongListSelectortoyourproject
How do I make it to navigate to different pages according to the option chosen?
<phone:LongListSelector x:Name="selector" SelectionChanged="selector_SelectionChanged">
event handler (in code behind):
private void selector_SelectionChanged(object sender, SelectionChangedEventArgs e) {
if (selector.SelectedItem == null)
return;
NavigationService.Navigate(new Uri("/yourNextPage.xaml", UriKind.Relative));
selector.SelectedItem = null;
}
Here you can find example with JumpList handler: http://www.dotnetspeaks.com/DisplayArticle.aspx?ID=215
I've some UserControls which are created dynamically, with parameters :
foreach (DataRow dr in drc)
{
question = (from ques in bdd.QUESTION where ques.ID_QUESTION == idQuestion select ques).FirstOrDefault();
List<Object> listParams = new List<Object>();
listParams.Add(question);
AdminQuestion qa = (AdminQuestion)(Controller.LoadControl(Page, "~/UserControls/AdminQuestion.ascx", listParams.ToArray()));
pnl_question_list.Controls.Add(qa);
}
This is a method I found on SoF and it works great.
This method is called when I click on a button, and all my usercontrols are correctly created.
In this usercontrol, I have a button :
<asp:Button ID="btn_validation_modify_question" runat="server" Text="Modifier"
CssClass="clear_left_float_left myBouton myBoutonEnvoyer"
OnClick="btn_validation_modify_question_Click"/>
And my method :
protected void btn_validation_modify_question_Click(object sender, EventArgs e)
{
QUESTION q = (from m in bdd.QUESTION where m.ID_QUESTION == question.ID_QUESTION select m).FirstOrDefault();
q.MESSAGE = txt_modify_question_message.InnerText;
q.ID_THEME = new Guid(ddl_modify_question_theme.SelectedValue);
bdd.ApplyCurrentValues<QUESTION>("QUESTION", q);
bdd.SaveChanges();
}
But when I click on the button, it don't apply the method, and reload the page, like if I didn't have any declared method.
Is there something I don't know? I already used this technique and everything worked...
If you add controls dynamically, you'll normally need to do it on Init or PreInit page events. Otherwise event handlers will never work.
So, dynamically added controls must be programmatically added to the Web page on each and every page visit. The best time to add these controls is during the initialization stage of the page life cycle, which occurs before the load view state stage. That is, we want to have the control hierarchy complete before the load view state stage arrives. For this reason, it is best to create an event handler for the Page class's Init event in your code-behind class, and add your dynamic controls there.
Note You may be able to get away with loading your controls in the
Page_Load
event handler and maintaining the view state properly. It all depends on whether or not you are setting any properties of the dynamically loaded controls programmatically and, if so, when you're doing it relative to the
Controls.Add(dynamicControl)
line. A thorough discussion of this is a bit beyond the scope of this article, but the reason it may work is because the
Controls
property's
Add()
method recursively loads the parent's view state into its children, even though the load view state stage has passed.
Here you have more information.
EDIT
Just to be sure we're talking about the same, here you have how your code should look like
protected void Page_Init(object sender, EventArgs e)
{
...
foreach (DataRow dr in drc)
{
question = (from ques in bdd.QUESTION where ques.ID_QUESTION == idQuestion select ques).FirstOrDefault();
List<Object> listParams = new List<Object>();
listParams.Add(question);
AdminQuestion qa = (AdminQuestion)(Controller.LoadControl(Page, "~/UserControls/AdminQuestion.ascx", listParams.ToArray()));
pnl_question_list.Controls.Add(qa);
}
...
}
PageLoad(){
If(!Page.IsPostBack())
foreach (DataRow dr in drc)
{
question = (from ques in bdd.QUESTION where ques.ID_QUESTION == idQuestion select ques).FirstOrDefault();
List<Object> listParams = new List<Object>();
listParams.Add(question);
AdminQuestion qa = (AdminQuestion)(Controller.LoadControl(Page, "~/UserControls/AdminQuestion.ascx", listParams.ToArray()));
pnl_question_list.Controls.Add(qa);
}
}
Did you try with this solution? And not use Page_Init()?
I have a GridView on ASP.NET web form which I have bound to a data source and set it to have 10 records per page.
I also have a hyper link column on the GridView, such that a user can navigate to another page (details page) from the list. On the details page, they have "Back" button to return to the GridView page
Edit
Just to clarify the query
I am looking for sample code snippet on the Server Side on how to specify the page index to set the GridView after data binding. The idea is to ensure the user navigates to the same page index they were on.
The three basic options at your disposal: query string, session, cookie. They each have their drawbacks and pluses:
Using the query string will require you to format all links leading to the page with the gridview to have the proper information in the query string (which could end up being more than just a page number).
Using a session would work if you're sure that each browser instance will want to go to the same gridview, otherwise you'll have to tag your session variable with some id key that is uniquely identifiable to each gridview page in question. This could result in the session management of a lot of variables that may be completely undesirable as most of them will have to expire by timeout only.
Using a cookie would require something similar where cookie data is stored in a key/data matrix (optimized hash table might work for this). It would not be recommended to have a separate cookie name for each gridview page you're tracking, but rather have a cookie with a common name that holds the data for all gridview pages being tracked and inside that have the key/value structure.
Edit: A small code snippet on setting the page index.
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
try
{
if(HttpContext.Current.Request["myGVPageId"] != null])
{
myGridview.PageIndex = Convert.ToInt32(HttpContext.Current.Request["myGVPageId"]);
}
}
catch(Exception ex)
{
// log it
}
}
}
I'm more of a fan of the Session approach, personally. Simply save your page index as a session variable, and, if this Session variable isn't null on page load, use it to fire your "OnPageIndexChanging" method, like so:
Set your current page number whenever the page number changes:
protected void GridViewIndexChanging(object sender, GridViewPageEventArgs e)
{
myGridView.PageIndex = e.NewPageIndex;
Session["pageNumber"] = e.NewPageIndex;
//whatever your page index changing does...
}
Then, on Page_Load do something like:
if (!IsPostBack)
{
if (Session["pageNumber"] != null)
{
GridViewIndexChanged(myGridView, new GridViewPageEventArgs((int)Session["pageNumber"]));
}
}
you can ues the Page Index Change Event of Gridview and Find out the Current Page Index for e:g
yourGridId.PageIndex=e.NewPageIndex;
ViewState["GridPageIndex"]=e.NewPageIndex;
on PageLoad Get the Viewstate Value
string pIndex=string.Empty;
pIndex=Convert.toInt32(ViewState["GridPageIndex"]);
if(!string.Empty(pIndex))
{
yourGridId.PageIndex =pIndex;
}
you must use query string and is recommended, otherwise you can use session object but don't use that for this as you may have grid view opening in different pages so use query string .
gridView1.CurrentPageIndex = (Request["pageNo"] != null) ? Request["pageNo"] as int : 0;
gridView1.DataSource = myDataSet;
gridView1.DataBind();
you can update your link on GridView_DataBound event
I have an asp.net application in which i want to get the value of hidden field value in to my code behind page.
Actually its executing code first and after that its executing javascript.
That's why i am not getting the value. Please tell me how can i get the value.
Javascript
function changeCSS(colr,wd)
{
chooseStyle(colr, wd)
var CssTitle = document.getElementById('<%= hdCssTitle.ClientID %>');
CssTitle.value = colr;
}
and code behind page is
protected void Page_Load(object sender, EventArgs e)
{
string CssTitle = hdCssTitle.Value;
}
Values changed in Javascript won't be reflected in your server side script. You would have to make an Ajax post to your code-behind to obtain it.
Get hidden field and access that value like this string s = hidden.Text