Web Forms :: TreeView Control Rendering Using Xmlhttp?
Feb 2, 2010
I am developing website using xmlhttp request.I am using treeview control in a webpage.I am sending xmlhttp request to page for adding a treenode to treeview control.I added a node in the treeview control and i render the treeview control html using control.render method and send html to client through without postback.But i am not able to maintain the state of treeview control like selected node and expanded nodes.So I want to send state info to server through xmlhttp and how to update the state info in server,aslo i need to update the treeview control javascript objects like treeview_data which maintains the treeview state when i return back from server.
I've defined node styles for my TreeView instance in markup (using <LevelStyles> for example). Everything renders correctly in IE7/8 but, when rendering in Chrome, Safari or FireFox, the styles are not being applied. From looking at the source code for the page, I can see that the various runtime css classes are being injected into the top of the page, but the class attributes on the <a> tags (within the generated TreeView HTML) are empty (class=""). In IE, the class attributes contain references to the classes that were injected into the page.
Can anyone explain why this is happening? I can see no logical explanation for this, and it's a big issue - My client primarily uses Safari, as they're Mac based.
I've got a Treeview inside an Updatepanel, currently I'm developing directly on a dev server with a remote connection to it. I've set the CollapseImageUrl and ExpandImageUrl properties and when I view it on the dev servers' browser it renders fine.
i have an Async JQuery Treeview working, but in addition to filling out the tree - id like for every node expanded to update part of the page with information as well - is this possible?My View looks like this:
I've successfully used the xmlhttp object to redirect (xmlHttp.open) user to another page but I have the following issue ..I have a classic ASP application that has some very antiquated "admininstration" functionality built in that loops through a SQL table with NT Accounts and allows the link to only be visible to users with NT account in the table. We have since moved on to manage permission to our .net apps using an object that looks for your NT account in an Active Directory Group. So, I would like to use the .net object to return True if NT account is a member of the group and then display the link (which is in the classic ASP page) if the .net object returned true.I don't know if that can be done .. I just know I'm able to return the TRUE value using the xmlHTTP ajax object but I only want to set visibility of a link rather than xmlHttp.open to redirect to another page.
why the following code bombs with a NullReference exception.
[Code]....
I just want to output the html for the menu control to a string, if I remove the line that adds the new menu item or I change the control to a calander control instead of a menu control the it works fine.
Once I click on 'Engines included' a treeview having all the engine node should show. I am geting the engine collection dynamically from database.
1.What should i use to create enginesIncluded control? 2.How do i show a user control having a treeview on click of 'engine included' control? 3. I also need to show the selected engines on the top row as buttons .
I was working with treeview and bumped into this problem where i need to add child nodes to a treeview control,these child nodes are a combination of textbox and button control so that
i should be able to save the text as new child control,i tried overiding the pre render and post render text but didn't get the solution.
I am trying to render the Button control @ serverside with PostBackUrl properties to set to another page ""~/page1.aspx". When I click on that button , it still postback to same page , does not postback to "page1.aspx" . I am trying to implement crosspage postback. I don't know button information and postbackurl info at design time. I Only know button and PostbackUrl info @ runtime.Code I am using
protected void Page_Load(object sender, EventArgs e) { div1.InnerHtml = GetRenderControl(); } public string GetRenderControl() { Button buttonAdd = new Button();
I am having a problem with rendering a menu control inside a server control. I am getting an error in the RenderContents override method when I try to render the Menu Control. The error I am getting is an Object Reference error. The code is below...
I've encountered was appears to be a strange bug with the menu control, and alas, I am unable to find much useful information on it (which leads me to believe I have something installed or confingured incorrectly). Here the problem:
When declaring a menu control with a staticHoverStyle, for example:
Has no effect on the behavior of the control once it's rendered, neither in Firefox nor IE.In fact, using the source code at
http://msdn.microsoft.com/en-us/library/ms366731.aspx with no modifications also results in the hoverstyle not working.
This problem seems to be "fixed" if you specify the css attribute declaratively, for example, StaticMenuItemStyle-BackColor="Yellow". Alternatively, if you specify RenderingMode="table" then the hoverstyle seems to work. It's only when you're using a cssclass with a list that things seem to mess up.
Finally, I notice that in the rendered html, the control embeds some styles between /* <![CDATA[ */ and /* ]]> */ comments that affects the final appearance of the menu control, sometimes overwriting a cssclass you specified (ex: the margin for dynamic menus can only be controlled with the HorizontalOffset property, and not by css). This is undesirable, but I don't see anything that seems to overwrite the behavior of hover elements. Actually, the .hoveritem class doesn't appear anywhere in the markup at all, but when you specify the StaticMenuItemStyle-BackColor property, then the value is rendered correctly in this block of styles.
I have a user control with a datagrid and few other information on title and summary. I would like to render this control to an Excel file !
The problem is , as soon as i try to open the rendered xls file, Excel reports an error, that the file extension is not valid, and that it is not from a trusted resource.
Two separate questions, but sufficiently intertwined that I'm going to try the two together....
Firstly - User Controls and Behaviours
I have a User Control which contains a few visual controls. I am attaching some behaviours by using GetScriptDescriptors and am passing some JavaScript to the browser using GetScriptReferences. That is all rock solid and working well. However, when developing, I did discover that I couldn't attach the ehaviours to the User Control itself - not surprising as rendering a User Control does not create a DOM element which represents the actual control. So, I have attached my behaviours to a "random" TextBox within the User Control.
So - first question, is there a better way to do that? For example, should I always be rendering a SPAN as an element to surround the control? Not sure what that would do to the robustness of the rendering. What is the right way to attach a behaviour to a User Control.
Secondly - Accessing those same Behaviours later
Assume I have placed a User Control on the page. That User Control exposes a Property (actually a Javascript Function of course) which does "something" to the control - for the sake of example we'll say that the function is set_Border(colour). I then have a behaviour on the same page (actually an Extender on a different control) which needs to call the function. I have a reference to the User Control in my script, so I have tried TheControlReference.set_Border('red') and find that my control doesn't support the set_Border method.
I guess this is probably because the behaviours are not attached to the User Control itself, but to a GUI element within it. Hence, I suspect that the answer to the second question lies within the answer to the first.
I have a custom control that renders different controls based on a property value. This all works correctly until i try and add a rating control to the control. When i render both controls in the CreateChildControls the control is rendered properly.
However when i try to add layout by overriding the RenderContents method and rendering controls there, an error is generated Extender controls may not be registered after PreRender.The code shows both methods of creating the controls.
VB, .net 4.0, VS 2010. All of the sudden all of my button controls aren't rendering properly. They are in places on the form that make no sense. If I change the button control to any other control name such as an image button, they format corrrectly.
I hate tables - don't want to use tables, unless I have tabular data to display. A menu is not tabular data (as far as I am concerned.) I was elated to see that in asp.net 4 - the menu control renders as a <ul> <li>, instead of as a table. However - try as I might, I can not get a horizontally orientated Menu to split into even columns, and text align center. FYI - I don't use fixed width - so I can't just set a width to 1000 - and separate it into even columns. Besides that, I want it to change width dynamically, based on the number of "columns (menuItems)" there are. Is it possible to spread out the <li> menu items evenly across the space I provide for them in their containing div or will I have to quite using menu controls, and start using JQuery Menu's?
I have Two Datalist Control . One is dtlistCat and second is dtlistSeries. dtlistSeries is filled by dtlistCat by dtlistCat_ItemDataBound method .
Coding side is ok . But Only problem in rendering . I want the page render with dtlistSeries has 2 repeat column in verticle direction I think only designning part creating problem .Not proper width or height specified so.
In my asp.net application I'm using TreeView control, and at some point I noticed that TreeView.Nodes property doesn't return all the nodes, so I'm curious how can I get ALL Nodes of TreeView control to iterate through them in foreach loop, any tricks, or I miss something?
I have a simple Treeview on my web page. I am using ASP.Net 3.5. I have 2 parent nodes and then some child nodes for each parent when expanded. I want my 2 parent nodes to align up to the left. And I want the child nodes to be idented under the parent and all aligned to the left. Presently, it seems like everything is aligned in the center. It seems odd that there is not a horizontal alignment proprty. Or am I just not seeing it?
i only found websites that uses the XMLHTTP request to call an aspx page or what ever page ( make a request to a page that appears the piece of data in a div or so )but i have a question is it possible to use it to bind asp.net server controls Examples 1- bind a gridview or datalist from this XMLHTTP request 2- after click an edit button in a grid can i use XMLHTTP request to fill some text boxes and dropdowns and other asp.net server controls 3- can i use upload files using XMLHTTP request i want to know if this is possible or not because Ajax and update panels are very slow and affect the server and client performance is there another alternative if my senarios are imposible with XMLHTTP request where can i learn about this alternative if this possible where can i learn more about this XMLHTTP request with asp.net server side controls instead of ajax and updatepanel
