Web Forms :: Modifying Generated Html Source Of A Web Control
Dec 3, 2010
I am using a third party control for my web page. I do not have the source code to the DLL. I need to make a very small change the html that the control generates. Is there a way to capture the html generated by the control, and then render the control with that small change.I can override the render method of the parent control, is there a way in that method to find out the html that the control generates in there and render it with the small change?
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Similar Messages:
Jul 28, 2010
I'm trying to modify the output of my GridView in the RowDataBound event handler, but it's not working - nothing happens.
My code:
Private Sub MyGridView_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles MyGridView.RowDataBound
e.Row.Attributes.Add("data-xkoordinat", 0)
End Sub
[Code]....
Is there anything here that would cause the rows not to be databound? I'm reloading via F5 or by selecting the address field in my browser and hitting Enter, so I don't think postbacks should be an issue.
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Mar 3, 2010
You've probably noticed that when you debug an error which comes from an ASPX or ASCX file (literally, not from a corresponding code-behind file), ASP.NET displays an error page showing you the source file and the line on which the error occurs. The source file being displayed is automatically generated from parsing the page/control. The question is: how can I see this source file without purposely causing an exception?
I'd love to hear that there is some programmatic way (the complexity doesn't matter) to generate source files (preferrably, .cs) from a series of ASPX/ASCX files.
Example. Consider the following ASPX page (the code-behind file may even be absent):
<%@ Page Language="C#"%>
<%@ Register Assembly="AspxGen" Namespace="AspxGen" TagPrefix="ag" %>
<html>
<head><title>Some Title</title></head>
<body>
[Code]....
d:DevAspxGenAspxGenDefault.aspx(9,80): error CS0103: The name 'ThereIsNoSuchProperty' does not exist in the current context
This means, theoretically I can open the .CS files passed to the compiler (namely, App_Web_sqj3krv3.0.cs and App_Web_sqj3krv3.1.cs) and see what ASP.NET has generated from my ASPX markup. Trying to rephrase the previous question: how can I obtain this file from an arbitrary ASPX file (assuming that the file is correct and hence no info will be given on where to search)?
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Mar 17, 2010
I have two user controls (wishlist & shopping cart) The shopping cart & wishlist objects are both in sessions.Also both controls are sitting inside the masterpage and the wishlist has the ability to move an item to the shopping cart. Now how do i achieve this? Originally i thought i would expose a public method within shopping cart called "BindItems" which would rebind the datacontrol, however this is causing .NET's automatic postback validation to throw an exception.
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.I dont want to set EnableEventValidation to false either for security reasons.
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Jan 29, 2010
I inherited a really weird ASP.NET application where every .aspx page is basically a WebControl that acts as a surface for every other control that page is supposed to render/display.
One such page has a DropDownList -- I wanted a very simple thing that people do every day, namely to cause a postback when user changes a selection in it. I thought all I had to was set dropDownList.AutoPostBack = true, but after the page is rendered, when I see the generated HTML, I notice that there is no "onchange = __doPostBack(...)" code for the dropdownlist. Consequently selection changes don't do anything. Before I spend too much time digging into this, is there something obvious I am missing?
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Feb 13, 2010
My requirement is to catch the event of an HTML tag being generated because of an asp.net server side control. I want to add an attribute in the HTML tag. For e.g. the following asp.net code
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<h2>
Welcome to ASP.NET!
</h2>
<p>
To learn more about ASP.NET visit <a href=[URL]</a>.
</p>
<p>
You can also find <a href=[URL]
title="MSDN ASP.NET Docs">documentation on ASP.NET at MSDN</a>.
</p>
</asp:Content>
the following HTML code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head><title>
Home Page
</title><link href="Styles/Site.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form method="post" action="Default.aspx" id="ctl01">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKMTY1NDU2MTA1MmRkp9DJIieDvqkrE8SkX7DXlKVx8axRtwxzwC8dPiXknVQ=" />
</div>
<script src="/SampleWebsite/WebResource.axd?d=1_B8-8FENEP2CmTp4sEd5ul-1cS7Yk7j9XVfvsDr3lg1&t=633937402550058503" type="text/javascript"></script>
<div>
<div>
<div>
<h1>
My ASP.NET Application
</h1>
</div>
<div>
[ <a href="Account/Login.aspx" id="HeadLoginView_HeadLoginStatus">Log In</a> ]
</div>
<div>
<a href="#NavigationMenu_SkipLink"><img alt="Skip Navigation Links" src="/SampleWebsite/WebResource.axd?d=EJ2n6It6bhgyTRuPFfrvKg2&t=633937402550058503" width="0" height="0" style="border-width:0px;" /></a><div id="NavigationMenu">
<ul>
<li><a href="Default.aspx">Home</a></li><li><a href="About.aspx">About</a></li>
</ul>
</div><a id="NavigationMenu_SkipLink"></a>
</div>
</div>
<div>
<h2>
</h2>
<p>
To learn more about ASP.NET visit <a href="http://www.asp.net" title="ASP.NET Website">www.asp.net</a>.
</p>
<p>
You can also find <a href=[URL] title="MSDN ASP.NET Docs">documentation on ASP.NET at MSDN</a>.
</p>
</div>
<div>
</div>
</div>
<div>
</div>
<script type='text/javascript'>new Sys.WebForms.Menu({ element: 'NavigationMenu', disappearAfter: 500, orientation: 'horizontal', tabIndex: 0, disabled: false });</script></form>
</body>
</html>
I want to capture the events when HTML, BODY, DIV etc HTML tags were generated.
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Feb 15, 2010
I couldn't decide where would be the most apprioate. I looking for an online source control site, if such a thing exists? I've checked out codeplex and thats really for open source projects ? which this isn't. does anyone have a recommendations?
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Dec 21, 2010
How can i get DataSource property & Databind method of HTML Table.Do i have to make a new control for it? if yes then how can i do this.
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Jul 7, 2010
I'm making a html document by using a StringBuilder, the document is used at a messageBody for a email.
I want to add a Image to the document. Bu no matter how I'm doing it the image dosen't show up in the email.
The image is available from the site, I've tried pasting the address in the browser and the image shows up fine.
[Code]....
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Jan 1, 2011
I am creating a web application that allows a user to download a csv file of a gridview. However, after looking at tutorials online such as http://www.aspsnippets.com/Articles/Export-GridView-To-Word-Excel-PDF-CSV-Formats-in-ASP.Net.aspxand such, I successfully got the table I wanted but there are HTML content appended to the table as well.There was also a similar problem being brought up on the forum,http://forums.asp.net/p/1528174/3692826.aspx. The solutions didn't help me much though. However, I am not really sure how Handlers can benefit this. Furthermore, I don't want the user to be navigated to a blank page just to download the csv file. I tried to debug and insert removal code to remove the html code before the response object is being wrote out but seems even at the end of the writing method, the response object seems to be holding just the table content only.
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Aug 16, 2010
I have successfully been able to parse HTML from a website:
TestParser parser = new TestParser [URL]
List<Pairing> pairings = parser.ParsePairings();
DBSave.SavePairings(pairings, userID);
----------
This works. Now I have to submit a form via C# code.... DONE. It works. And my C# code saves the "new" HTML to a string variable called "submitParsedHTML". My question is: how to I change out the URL, to go through the string variable instead? I am thinking about doing this: When the user clicks the button to "Post" to the form and the app grabs the HTML. The app logs into my FTP account and saves the HTML as a seperate (temporary) file to be used on the internet [URL] Then the app can then parse the HTML as if it was a normal HTML document and not have to go through formatting the text to an HTML document. What do you all think?
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Sep 20, 2010
I have a proplem i want to call the function at the time of binding data in datalist in source hlml.
so that i can bind the return type of the function after check the value what is the coming from the database.
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Oct 5, 2010
i have a Rad Upload control to upload more than one image ,,the problem is i want each image to have a caption (inserted by the user as a text)during the uploading operation,,so what i wanna to do is modifying the Rad Upload control and adding a text box in it and access the data in this text box .. how to do this?
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Jan 7, 2013
I have an asp:repeater control on a form. It contains 4 columns. Based on a certain value as a result of a database read, the 4th column, needs to contain a button control else it will contain plain text. How do I this in the code-behind using VB.Net? The code that I have is below but it's not working. I've never worked with a repeater control before.
Code:
<asp:repeater id="dlAppeal" runat="server">
<HeaderTemplate>
<tr id="AppealHeader" runat="server">
<td class="tableHeaderNw" align="center" width="11%">Date</td>
<td class="tableHeaderNw" align="center" width="16%">Type</td>
<td class="tableHeaderNw" align="center" width="53%">Description</td>
<td class="tableHeaderNw" align="center" width="20%">Appellant</td>
[code]....
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Oct 31, 2010
I have an ASP.NET web forms site with a rather large menu. The HTML for the menu is dynamically generated via a method in the C# as a string. I.e., what is being returned is something like this:
<ul><li><a href='default.aspx?param=1&anotherparam=2'>LINK</a></li></ul>
Except it is a lot bigger, and the lists are nested up to 4 deep.
This is written to the page via a code block.
However, instead of returning a flat string from the method I would like to return it as formatted HTML, so when rendered it looks like this:
<ul>
<li>
<a href='default.aspx?param=1&anotherparam=2'>LINK</a>
</li>
</ul>
I thought about loading the html into an XmlDocument but it doesn't like the & character found in the query strings.
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Jul 15, 2010
In my ASP.Net page I have
<form id="MasterPageForm" runat="server">
However, whenever the markup is generated, it turns into
<form name="aspnetForm" method="post" action="SomePage.aspx..." id="aspnetForm">
Is it possible to set what the generated HTML id for the form is?
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Aug 11, 2010
I have a CreateUserWizard control to be able to allow an anonymous user to create an account. Provided that all entered information is correct that the user enters, a new account is created for him/her. But also, when this user is created, I want to [b]also[/b] add the username to another table in my ASPNETDB database. How exactly can I "tap" into the event that creates a user and adds it to the appropriate tables (aspnet_Users, Members, etc.) and make it add the username to yet another table?
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Jul 28, 2010
I'm coding an ASP.NET page, with VB code behind. When the user clicks a button on the page, I send them an email with information and instructions. Rather than sending a plain text email, I send a nice, pretty, HTML-formatted one. Right now, I'm doing this in a way that I KNOW will be difficult to maintain. That is, I'm straight up writing out all of the html. i.e.
markup += "<fieldset>"
markup += "<legend>"
markup += "Required Documents"
markup += "</legend>"
and so on. Is there a way to create an aspx page (with vb code behind), and send the html of that page in the body of the email? The information is dynamic, so this pseudo-page would need logic in the on-load event to format the html correctly.
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Mar 31, 2010
how can i set ID to tabelrows generated by datagrid/datalist i want to assign a row id by myself to every row of datalist.
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Feb 4, 2011
I am currently generating a .doc file as html using asp.NET.
I wish to insert a page break to the page but don't know how.
I've tried using the css style='page-break-before:always' but it does nothing.
This is the code assigned to a button click event:
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Charset ="";
HttpContext.Current.Response.ContentType ="application/msword";
string strFileName = "GenerateDocument"+ ".doc";
[Code]....
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Nov 21, 2010
Hi,
Everytime I view the source of ASP.NET website I found alot alot of HTML markup generated. I even tried Visual web Developer and design a simple page and then do the same thing with PHP and I found ASP.NET generates more HTML!
Now, how can ASP.NET be faster if it is generating HTML in this way!
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Jan 12, 2010
I generate in a foreach loop html links ("test which I add to a pre defined literal.ow can I add a void to the generated html link? I tried with runat server and onclick.. but does not work..Goal is to add by the onclick a pre defined void from a API.
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Dec 31, 2010
I have a a dropdown on a page
<asp:DropDownList ID="drpName" AutoPostBack="true" AppendDataBoundItems="true" runat="server" ></asp:DropDownList>
and I on occasion want to add items to it using javascript/jquery.
When I select the items that have been added and it does a postback I get the following error:
Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
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Aug 3, 2010
I developed a basic web page in MVC 2 for learning the framework, and I am stuck in this situation:
I have 3 classes: Client - Product - New. And for all need to display a modal popup to create/edit action. For display the modal i used JQuery and jqModal plug-in.
I created the controllers for all objects, the views for Index action, and Delete action. For the Create/Edit Action I created a partial view named ModalBox. Inside this partial view, I have an Ajax.BeginForm, and it calls another partial, that represent the form of the objects.
This works very fine, ... for the project object! in FireFox 3.6, for others object's the form tag is missing...
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Dec 28, 2010
I have an asp.net page where i have the below markup.Basically this markup is generated from codebehind by reading records from a table and looping thru them.For each record in table,there will be a div block. Basically this form is to read/show settings for a user.The settings entries are stored in a table.
<div id='divContainer' runat='server'>
<div id='div1' runat='server'>
<table>
<tr>
<th>Name</th>
<td><input type='text' id='txtName1' value='something' /></td>
</tr>
</table>
</div>
<div id='div2' runat='server'>
<table>
<tr>
<th>Domain name</th>
<td><input type='text' id='txtName2' value='something' /></td>
</tr>
</table>
</div>
<div id='div3' runat='server'>
<table>
<tr>
<th>URL</th>
<td><input type='text' id='txtName3' value='something' /></td>
</tr>
</table>
</div>
<div id='div4' runat='server'>
<table>
<tr>
<th>Some other value is enabled ?</th>
<td><input type='checkbox' id='chk4' /></td>
</tr>
</table>
</div>
</div>
The id's of each input element will be unique. Now in codebehind i want to read the values of each input elment to save the changes user made.How can i read the elements here ? Since the mark up is generated in codebehind as a string and appended the the INNER HTML of the external div,I cant read values like we do for a control which we drag and drop in the IDE.
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