I am using ASP.NET with C# 2.0 and Visual Studio 2005. I am using a Master page and content pages. I have a treeview menu in the master page and when a user selects any menu item I redirect to that content page.
My problem is that after a user navigates to the content page all the treenodes refresh and the structure is collapsed. I want the selected treenode to stay expanded.
Can anybody help me out?
When you refresh the treeview you want to call treeView1.ExpandAll();
Also add an event for the BeforeCollapse and set the event's Cancel property to true, to prevent the user from collapsing your treenodes.
private void treeView1_BeforeCollapse(object sender, TreeViewCancelEventArgs e)
{
e.Cancel = true;
}
Hope this helps.
-jeremy
This is a common enough problem that is automatically handled by ASP.NET if you use a SiteMapDataSource control as the datasource for your TreeView. In this case, you haven't mentioned what the Datasource of your TreeView is.
You also haven't mentioned if the TreeView contains links (the NavigateUrl property is set) or Text items that postback for each click. If it is the former, then as far as I know, you are out of luck! This is because none of the Selection events are raised for TreeNodes which have their NavigateUrl set. They just function as regular hyperlinks.
If however, it is the latter, then you can try out the following steps :
a. Handle the SelectedNodeChanged event of the TreeView. In this event handler, retrieve the current value of the SelectedNode.ValuePath property and store it in ViewState/Session. Use the Value of the of the SelectedNode to conditionally redirect the page to URL mapped to it.
Something like the following:
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
TreeNode selNode = TreeView1.SelectedNode;
string pathToNode = selNode.ValuePath;
Session.Add("SelPath", pathToNode);
switch (selNode.Value)
{
//Redirect to URL accordingly.
}
}
b. On subsequent load of the Master page (the page to which you redirected), retrieve the value of the ValuePath set earlier and find the previously Selected node and Expand it.
Something like the following:
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
string pathToNode = (string)Session("SelPath");
Session.Remove("SelPath");
TreeNode selNode = TreeView1.FindNode(pathToNode);
if (selNode != null)
{
selNode.Expand();
}
}
}
Note that I haven't had an opportunity to test the code so this is mostly hypothetical.
Try using the OnTreeNodeDataBound event and the treeView.SelectedNode property
Also, might want to check how/ when you're binding your TreeView to it's DataSource. You might be rebinding it on IsPostBack which will re-render the tree.
The TreeView should maintain its nodes on PostBack.
Even though you are using a Master page, once the user navigates to the content page it is rendered as a new/different page. Because of the Master page the same treeview is loaded but not the same instance. You will need to store and load what nodes were expanded.
Related
I have 3 BladeItems in another page. And I want to navigate from MainPage to that page and bring the requested BladeItem into view. But it is not working.
I first thought it was because that the page has not been loaded. So I put it into the Page_Loaded. However, it is still now working. Why is that?
private void Page_Loaded(object sender, RoutedEventArgs e)
{
TitleBarHelper.SetDarkTitleBar();
Window.Current.SetTitleBar(AppTitleBar);
UpdateTitleBarLayout(Windows.ApplicationModel.Core.CoreApplication.GetCurrentView().TitleBar);
FullMediaControl.Update();
SetMusic(MediaHelper.CurrentMusic);
FullPlaylistControl.ScrollToMusic(MediaHelper.CurrentMusic);
if (MusicInfoRequestedWhenUnloaded)
{
MusicPropertyBladeItem.StartBringIntoView();
MusicInfoRequestedWhenUnloaded = false;
}
else if (LyricsRequestedWhenUnloaded)
{
LyricsBladeItem.StartBringIntoView();
LyricsRequestedWhenUnloaded = false;
}
}
Source Page Code is here. This page can be navigated using the "Show Lyrics" or "Music Info" item in the MenuFlyout at the right bottom more button.
And actually the FullPlaylistControl.ScrollToMusic in the code above is also not working. It just scrolls to a row in a ListView. I guess they might be the same reason.
This is the documentation for StartBringIntoView.
According to the instructions in the documentation, this method is only possible when the control is rendered on the visual tree, so you need to modify it when you call the method.
You want MusicPropertyBladeItem.StartBringIntoView() to work, you need to call it in the MusicPropertyBladeItem_Loaded event. For the same reason, you need to call ScrollToMusic when the FullPlaylistControl is loaded.
Page_Loaded only means that the page is loaded, but it doesn't mean that the controls have been rendered.
Best ragards.
I have two Pages ProductSearch,ProductDetail and Im changing the Content property to Navigate between Pages. I want to know if any events are fired so I can write some code in it?
On ProductDetail Page I have UIElement property
public UIElement MainContent { get; set; }
On ProductSearch Page I Navigate to ProductDetail By setting the Content property like this:
private void OnGetDetailsClick(object sender, RoutedEventArgs e)
{
ProductDetail productDetail = new ProductDetail();
productDetail.MainContent = this.Content;
this.Content = productDetail;
}
On ProductDetail Page's Back Button I navigate back to ProductSearch:
private void OnBackButtonClick(object sender, RoutedEventArgs e)
{
this.Content = MainContent;
}
Now I want to know how can I call a method when I navigate Back to ProductSearch Page i.e how would I know that I have Navigated from ProductDetail Page? I tried to check if it loads the page but found out that When you change content of control it doesn't fire the load event of the page. Any solution?
Yea this will not execute the load event since your are only changing the content obviously.
if you want to take advantage of navigation you should check out this video. Even if its done with blend the concepts apply also with Visual STudio: https://vimeo.com/6599527 (Simple Silverlight Master/Detail Navigation App with Blend 3)
You should check out articles on master detail binding like this one: https://msdn.microsoft.com/en-us/library/cc645060(v=vs.95).aspx
The key is to take advantage of the powerful binding concepts which come with silverlight. And if you are not using deep linking you might want to consider using a user control to hide/show details instead of a extra page.
HTH
So I've been working on this project, and we have a WebBrowser object on the form. The purpose of the object is that it loads in HTML Forms into it to be viewed, at this current point in time though, you are able to edit the contents of the HTML form, which is not desired.
I want to simply display this HTML form of information to the user, but not allow them to alter the textboxes or checkboxes or anything of that nature on the form.
I tried using the Navigating event and set e.cancel = true;. This haulted the control from even loading the page. And if I set it to only execute e.cancel = true; after the form had loaded, I could still change text boxes and such on the form, as it only seemed to randomly called the Navigating event.
Does anyone know of a way to get a WebBrowser object to be read only?
Cheers!
You can apply contentEditable attribute to the Body tag of the document.
Document.Body.SetAttribute("contentEditable", false);
This will make your document readonly for user.
You could try accessing all form elements on the page and set the readonly attribute on the tag. Something like:
var inputs = webBrowser1.Document.GetElementsByTagName("input");
foreach (HtmlElement element in inputs)
{
element.SetAttribute("readonly", "readonly");
}
You'd obviously have to repeat the process for all form elements (select etc.), but it should work.
I have been running into this issue as well. Thanks to steavy I have been able to come up with a solution :
Hook up to the DocumentCompleted event (you can do this in the designer) :
myWebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_procedure_DocumentCompleted);
Then make it readonly in the event :
private void myWebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
myWebBrowser.Document.Body.SetAttribute("contentEditable", "false");
}
I do this in the event when the document is fully loaded because I sometimes ran into a NullReferenceException, the body wasn't loaded yet and the line would throw.
I am trying to create a popup which will be used to select a month/year for a textbox. I have kind of got it working but however when I try and read from the textbox when I Submit the form it returns an empty string. However visually on the page I can see the result in there when I click the Done button which can be seen in the screenshot.
http://i27.tinypic.com/2eduttx.png - is a screenshot of the popup
I have wrapped the whole textbox/popup inside a Web User Control
Here is the code of the control
Code Behind
ASP Page
and then read from the Textbox on the button click event with the following
((TextBox)puymcStartDate.FindControl("txtDate")).Text
Any suggestions of how to fix the problem?
You may need to read the form posted value rather than the value from the view state. I have the following methods in my code to handle this.
The below code just grabs the values in the request headers (on post back) and sets/updates the controls. The problem is that when using the ASP.NET Ajax controls, it doesn't register an update on the control, so the viewstate isn't modified (I think). Anyways, this works for me.
protected void btnDone_Click(object sender, EventArgs e)
{
LoadPostBackData();
// do your other stuff
}
// loads the values posted to the page via form postback to the actual controls
private void LoadPostBackData()
{
LoadPostBackDataItem(this.txtYear);
LoadPostBackDataItem(this.txtDate);
// put other items here if needed
}
// loads the values posted to the page via form postback to the actual controls
private void LoadPostBackDataItem(TextBox control)
{
string controlId = control.ClientID.Replace("_", "$");
string postedValue = Request.Params[controlId];
if (!string.IsNullOrEmpty(postedValue))
{
control.Text = postedValue;
}
else
{
control.Text = null; // string.Empty;
}
}
I have a page that dynamically creates multiple usercontrols on the page_init event, and adds it to a placeholder on the page.
The usercontrols themselves databind to a repeater on page_init to a collection of about 10 strings, which outputs a div for each item.
There's also a "view more" link button on the user control. When I click the "view more" button it databinds another collection to a second repeater, with even more divs.
The problem: After clicking "view more" on one of the usercontrols, if I click "view more" on another usercontrol, the "view more" data is lost on the first usercontrol. I suspect it's because I'm not re-adding the controls, so viewstate isn't re-loaded.
Anyone have any ideas or am I just way off on this one? Thank you.
Problem is you need to re-create the dynamic controls on each postback and recreate their viewstate. Take a look at this article Dynamic Web Controls, Postbacks, and View State
Stan is right.
When you click in the link a postback occurs and you lost everything
I ran across the same problem, my aproach was recreate the dinamics UserControls on every postback.
this article http://www.codeproject.com/KB/user-controls/DynamicUC.aspx shows a example, but i implement a diferent code like this:
my page have the following method which dinammicaly add the controls to an PlaceHolder.
private void AdicionarControlesDinamicamente(int idPergunta)
{
if (idPergunta > 0)
{
this.IdPerguntaAtual = idPergunta;
PerguntaAtual = new Pergunta(this.IdPerguntaAtual);
UserControl uc = LoadControl(PerguntaAtual.TipoResposta.CaminhoUserControl, PerguntaAtual.IdPergunta);
phResposta.Controls.Add(uc);
ViewState["ControlesDinamicosPerguntaCarregados"] = true;
}
}
note this line of code ViewState["ControlesDinamicosPerguntaCarregados"] = true;
i store an information tha says that the controls already have been added to page.
then a ovveride the CreateChildControls to recreate the controls
protected override void CreateChildControls()
{
base.CreateChildControls();
// CHeck if the controls have been added to page, case true, i call IncluirControlesDinamicamente() again
// The Asp.Net will look into viewstate and wil find my controls there, so "he" will recreate their for me
if (ViewState["ControlesDinamicosPerguntaCarregados"] != null)
if (Page.IsPostBack)
AdicionarControlesDinamicamente(this.IdPerguntaAtual);
}
I think this help you.
PS: Sorry my english.