I'm working with dynamic fields in ASP.NET due to a very specifc and rigid end-user requirement that would take 2 hours just to explain. Suffice it to say, I can't make the requirement go away.
Anyway, I have a working solution in place; no problems with controls loading, rendering or maintaining their ViewState. This is what my OnLoad looks like:
[code]....
Will this cause any harm? Does it serve any purpose other than tell browsers you have .net installed?I like this article about changing the header to Pure Evil.[URL]
View 3 RepliesI have a web service asp.net project which has a global.asax with empty Application_Start and Application_End implementations.As far as I can understand, in this case it is of no use and could be removed (correct me if I'm wrong).Do I need to do anything other than delete global.asax and global.asax.cs (such as change something in web.config or in the project settings)?Just asking in order to not screw up some dependencies I'm not aware of...
View 1 RepliesIn a base class,the pre-render adds a Javascript to the page.In my derived class,I want to replace the Javascript with one of my own resource script.If the script is being added like this in the base class:
this.Page.ClientScript.RegisterClientScriptResource(typeof(GeomappingEditor), "SomeSpace.Resources.Scripts.Geomapping.js");
Then can I do something like this:
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
//HOW TO OVERWRITE JAVASCRIPT FILE HERE?
}
The reason why I thought this may be possible is because sometimes Javascript is added onto a page with a key like this:
this.Page.ClientScript.RegisterClientScriptInclude("geomapping", this.ApiScript);
So I know I can add another script in the page with "geomapping" being the key and it will overwrite the previous script. But it does not seem there is a key like this for "RegisterClientScriptResource".Any ideas on how to achieve this?
we are creating a custom content management and out portal page is bit bulky it is about 60Kb without images.
and during loading the page in some browser we can see some parts of site load faster than the other parts of the site where as we want to indicate (or instruct the web server) to load some of the areas first then load rest of the page.
is there any particular setting in IIS for is there any particular method in classic asp for doing that?
also I have the same question in asp.net.
I am familiar with creating and persisting dynamic controls on the first load of a page and on subsequent postbacks but I am having trouble with the following user initiated scenario...
In my demo I have a placeholder, two buttons and a literal
[code]....
I'm working on an ASP.NET project in which the vast majority of the forms are generated dynamically at run time (form definitions are stored in a DB for customizability). Therefore, I have to dynamically create and add my controls to the Page every time OnLoad fires, regardless of IsPostBack. This has been working just fine and .NET takes care of managing ViewState for these controls.
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
RenderDynamicControls()
}
private void RenderDynamicControls(){
//1. call service layer to retrieve form definition
//2. create and add controls to page container
}
I have a new requirement in which if a user clicks on a given button (this button is created at design time) the page should be re-rendered in a slightly different way. So in addition to the code that executes in OnLoad (i.e. RenderDynamicControls()), I have this code:
protected void MyButton_Click(object sender, EventArgs e)
{
RenderDynamicControlsALittleDifferently() [code]
My question is, is this really the only way to accomplish what I'm after? It seems beyond hacky to effectively render the form twice simply to respond to a button click. I gather from my research that this is simply how the page-lifecycle works in ASP.NET: Namely, that OnLoad must fire on every Postback before child events are invoked. Still, it's worthwhile to check with the SO community before having to drink the kool-aid.
On a related note, once I get this feature completed, I'm planning on throwing an UpdatePanel on the page to perform the page updates via Ajax.
I'm creating a page that users can upload a file to the webserver. After upload the page will then have a link to the file that has just been uploaded, along with any other files that have already been uploaded.As I am programatcially creating links to the files which have been uploaded, I have to do this in page_init or else the link button won't fire off it's event when clicked. MY web page does all this - it creates the link buttons and when I click on them, it calls the event method required i.e. a sub to download the file.
OK, the problem I've come accross is: when I click upload (to upload the file) - the page_init sub is called, displaying all the previously uploaded files as link buttons. Then my btnUpload_click sub is called, which uploads my current file. The only prob is the current file hasn't been displayed? I can only display links in the page_init, but because btnUpload is called after the page_init, the current file isn't uploaded until after page_init and therefore not dislayed?
I have a user control embedded in a web part. It has the following snippets of code:
[code]....
Why are some controls initialised and others not? How do I get around this if I'd like to update the Text property on currentPageLabel?
Update:
I've placed breakpoints all the way through the page life cycle and found that nextButton and currentPageLabel are never initialised. The breakpoints were placed at OnLoad, CreateChildControls, goButton_Click, OnPreRender, Render and OnUnload.
I have a page on which everything is loaded dynamically.
There is a Gridview (AutoGenerateColumns=true) and in the RowDataBound I check every column for a boolean datatype. If found I add a checkbox (autopostback=true) to the cell and register the CheckedChanged event.
The problem is, that I only get the CheckedChanged event, if I reload the grid in Page_Load:
protected void Page_Load(object sender, EventArgs e) {
LoadGrid();
}
But this is very expensive and causes that the db request will be executed twice. If I changed the code to what I want:
protected void Page_Load(object sender, EventArgs e) {
if (!this.IsPostBack)
loadGrid();
}
I get no CheckedChanged event.
Is there a possibility to get:
- Adding a Checkbox in RowDataBound
- Only "LoadGrid()" if it is no PostBack
- Getting the CheckedChanged event of the relevant row
I am using below article provided by you:
[URL]
I need to provide Remove button with every row added to grid. So that only the current row get removed on remove button clicked of that row.
I'm using a file manager-type WebControl that does lots of postbacks. It's placed inside a Page that is relatively complex. I would like to prevent the WebControl from causing the whole Page to go through the lifecycle.
Is there any way to isolate the WebControl from the rest of the Page? The only way I can think of is sticking the WebControl in a separate Page and creating an iframe in the original Page. Unfortunately that also means my WebControl properties/settings are no longer in the original Page. If I want two instances of the WebControl with different settings, then I have to create a Page for each setting and reference the correct one in my iframes. Not quite as "drag & drop" as I would like.
Does the OnActiveStepChanged method of an asp:Wizard control get processed after Page_Load and before Page_LoadComplete?
View 1 RepliesI have a ListView in a web form (c#/.net 4.0). There is an ImageButton in the ItemTemplate.
After a postback, the ItemCommand event fires... and then everythings stops. No other page events occur. (Actually there is one other thing: Dispose() from ExtenderControlBase runs right after the event code finishes - this site has some AjaxControltoolkit controls, though there are none on this particular page).
There are a lot of things involved here so it's not really practical to post all the code, but generally, is there anything that could cause this?
I am rebinding the ListView on each postback, because I'm handling paging on the server side. When I assign the data source to the ListView, it's initially going to have no rows. So at the time the command event fires, the DataSource has no data in it, since it hasn't yet been loaded from the database and rebound. I can't think why this would cause the entire page to just stop loading, though.
The template is just this:
<ItemTemplate>
<tr>
<td class="DataListRow"><asp:ImageButton ID="edit" runat="server" ImageUrl="~/images/nav/datagrid_edit.gif" CommandName="edit" />
</td>
// a few orther cells
</tr>
</ItemTemplate>
I hv Declared two Master page one Is Base and Derived.. Base Page Load is working but when i hv written load controls in Derived Page Load Using C# it's not working..
View 3 Repliesi am loading a usercontrols dymaically, i need to create a event listener so any controls that i load will pass back a int id to my aspx page. what is the best way to create a dynamic listener?
Control FeaturedProductUserControl = LoadControl("FeaturedProduct.ascx");
Controls.Add(FeaturedProductUserControl);
PlaceHolderLeftMenu.Controls.Add(FeaturedProductUserControl);
when does the constructor on a page in asp.net page lifecycle get called?
View 1 RepliesI would like to create an attribute I can decorate specific fields or properties with. This attribute will throw an exception if the field or property it decorates is null at a given point in an ASP.Net page lifecycle. I.E. if a property, "x", is null at the prerender stage of an ASP.Net page, it will cause a "ArgumentNullException" exception to be throw with a nice message. Or a mean message. Either way, a message of my choosing.
Is this possible with standard .Net attributes, or would some kind of Spring.Net magic be required?
I would like to wrap Session variables in a manner similar to that discussed on CodeProject.
[code]....
Here is my question: if I have to access CurrentUser multiple times in the same page, would I get a performance improvement by assigning it to a local variable instead of accessing the wrapping property? Or does the HttpSessionState make sure the object is only deserialized once per request, so that subsequent calls in the same http request don't cost any more?
I need to capture the amount of time that ASP.net takes to execute each page request in my application, but I need to exclude any network latency. I am currently capturing render times by using the StopWatch class and starting the stopwatch during the OnInit method of the page lifecycle and stopping it after the Unload method completes. It seems that the Unload method includes the time it takes send the request to the client, thus including any internet/network latency. What is the last possible point I could stop the stopwatch in the Page Life Cycle that would not include the time it takes to send the request to the client. Would it be directly before the Unload event?
Related question: Does ASP.net finish building the response before it starts sending to the client? Or does it start sending asynchronously, while the response is being formed?
I am using ASP.Net 2.0 with IIS 5 currently.
I have this code in a class that all of my pages inherit from:
readonly Stopwatch _serverExecutionTime = new Stopwatch();
protected override void OnInit(EventArgs e)
{
_serverExecutionTime.Start();
base.OnInit(e);
}
protected override void OnUnload(EventArgs e)
{
_serverExecutionTime.Stop();
base.OnUnload(e);
}
UPDATE
I tried capturing the execution time at the end of the OnRender method, at the start of the OnUnload method and at the end of the OnUnload method. In all three cases the difference in times was at most 1 millisecond. Even when testing this from a client in Europe to a server in the USA, the times were identical.
It seems that ASP.NET MVC just runs on top of ASP.NET WebForms. System.Web.Mvc.ViewPage in ASP.NET MVC inherits from System.Web.UI.Page which includes page lifecycle methods like OnRender and friends.
I have seen a couple of comments around the web to the effect that you should resist the urge to override these methods AT ALL COSTS!. Of course, this means that I find myself resisting the urge to do just that.Is there really that much wrong with something like the following?
public class SslPage : ViewPage
{
protected override void OnPreInit(EventArgs e)
{
// Make sure we are using SSL [code].....
One could debate the purity of putting that in a "View" but it seems plenty expedient.How dangerous/blasphemous is it to override these methods? When might it make sense?
I have an existing application of 20 equal user controls. Each user control contains a complex calculation. I have 2 lines visible as a start and when activating line 2 then line 3 becomes visible, when line 3 is activated line 4 is visible and so on. However this results in a very slow application! So instead I would like to dynamically load the user controls one by one.
So my question is: How do I load the user controls to the website by raising an event?
My existing code in html is:
Code:
<uc1:HeatSimpleLine ID="HeatSimpleLine1" runat="server" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine2" runat="server" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine3" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine4" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine5" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine6" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine7" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine8" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine9" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine10" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<!-- 11 til 20 -->
<uc1:HeatSimpleLine ID="HeatSimpleLine11" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine12" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine13" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine14" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine15" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine16" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine17" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine18" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine19" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine20" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine21" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine22" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine23" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine24" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
<uc1:HeatSimpleLine ID="HeatSimpleLine25" runat="server" Visible="false" OnClickUserControl="HeatSimpleLine1_ClickuserControl" />
instead I would only have the first to user controls visible and loaded and the loading the user controls as I need them for improving the performance of the application and thereby I will not be limited by only 20 user controls in the application. add example codes
Lets say I have a Web Application with a menu of products. When a user clicks a menu item, then create and display a dynamic set of controls in an Update Panel. I am currently doing this however the PostBack and recreation of controls is tedious and resource intensive.
Not sure about this but is it possible to build a webpage with controls on it, then display it in update panel or IFrame? Then on post back you wouldn't have to recreate everything all over again?
i am trying to load a dynamic iframe but it cannot visualize the page.
this is my html code:
[Code]....
and this is my codebehind:
[Code]....
i am using a content update panel on the page but the div of the iframe is out of the content panel.
how to call LoadDynamicControl() when btnPopUp was click?
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//..........
}
LoadDynamicControl(); // if i don't call this function here,i cannot find control to update,but if i call it here. It's will fire with any event.
}
protected void btnPopUP_Click(object sender, EventArgs e)
{
ModalPopupExtender1.Show();
}
protected void btnUpdate_Click(object sender, EventArgs e)
{
updateproductParameter();
ModalPopupExtender1.Show();
}