I'm more familiar with ASP.NET and not code behind.
how do I read the hidden "code" field in a code behind page using c#?
<html>
<body>
<form id="test" method=""post"" action="processing.aspx")
<input type="hidden" name="code" value="abcdefg">
<input type="submit" value="Submit">
</form>
</body>
</html>
Looking for sample to access the hidden variable which is declared in the aspx page in the webmethod.
View 1 RepliesI'm using a hidden field to store a value in an asp.net page. Basically I set the value of the hidden field whenever a value on the form is changed i.e. first name, date etc. The field is on a webform that has a master page and is in the content section:
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:HiddenField ID="hdnDirtyFlag" runat="server" Value='false' />
I change the value of the field in javascript by calling a function whenever an onchange event fires in other controls on the web form:
<asp:TextBox CssClass="niceInput" ID="tbFirstName" runat="server" MaxLength="40" Width="150" onchange='SetHiddenVariable();'></asp:TextBox>
<script type="text/javascript">
function SetHiddenVariable() {
// Set the value of the hidden variable so we know a field has been updated
var hiddenControl = '<%= hdnDirtyFlag.ClientID %>';
document.getElementById(hiddenControl).value = 'true';
}
</script>
So far so good. When the page loads the hidden field value is 'false', and if I don't change any values on the webform it remains false. Whenever I do change another control the javascript function gets called and the hidden field value gets updated to 'true'. Again this is all fine.
After I submit the form and update the database, I set the hidden field value back to 'false' in the code behind:
hdnDirtyFlag.Value = "false";
But when I click another button and do a postback, the hidden field value is still at 'true'.
Can anyone explain why this is? I stepped through the code behind and immediately after changing the value I can see the value is 'false'. There is an asp:UpdatePanel on the page but the hidden field is not part of this panel.
EDIT:
This is the code I use to check the value of the field in code behind in the second postback, after it has been set to false in the last step of the first postback. The value remains at true for some reason in the second postback, after it has been set to true in javascript on the client side then set back to false in code behind as shown above:
if (hdnDirtyFlag.Value == "true")
{
UpdateSecurityObject();
}
I am facing one asp.net server side issue using vb.net the problem is i declared one html input hidden field in my page, the name is hidden1. but when i going to call that name into server side code, that time i got the below error, <b>Name "Hidden1" is not declared</b> Code below:
Default.aspx
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication2._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
[code]....
I want to integrate paypal inside my shopping cart. For that it requires a html form to be embeded inside .aspx page with the action to paypal and method is post. Inside that form there are some hidden input filed. I want to assign one of those hidden field's value from server side code so i need to access that filed from server side. But how? Here is my form:
<form action="[URL] method="post" id="PaypalForm">
<input type="hidden" name="cmd" value="_cart"/>
<input type="hidden" name="upload" value="1"/>
<input type="hidden" name="business" value="[URL]
<input type="hidden" name="item_name_1" value="Item Name 1" />
<input type="hidden" name="amount_1"/>
<input type="submit" value="PayPal" />
</form>
I want to access amount_1 filed.
I have a custom user control which contains a asp hiddenfield object. The value of this hidden field is being set using javascript and I have verified that the value is being set properly. When a postback occurs the new value is not being saved and I cannot access it in my code.
I believe the problem is because the user control is not saved in viewstate and therefore the hidden field value is not saved accross postback. How can I make the hidden field save its value? I tried accessing it from the early page cycles and still no luck.
Solution: I end up creatting a WCF that accepts a get/post request, then place JQuery within the html page that retrieves the value and hands it off to the web service
I have a html page like below where I will be doing posting to a web site for registrations and my credentials are not suppose to show on the client side.
My question is how/what is the best way of reading the values from code behind or web service or any other way ?
<FORM NAME="web_form" ACTION="https://website.com/registration.php" METHOD="POST">
<TABLE WIDTH=961 BORDER=0 CELLPADDING=2 CELLSPACING=0>
<TR>
<TH WIDTH=380>
<P ALIGN=RIGHT><i>Encrypted Username:</i>
</P>
</TH>
<TD WIDTH=573>
<P><A NAME="username"></A><INPUT TYPE=TEXT NAME="username" VALUE="HOW TO GET VALUE???" SIZE=20 STYLE="width: 1.69in; height: 0.23in"></P>
</TD>
</TR>
<TR>
I am having an issue with one of my projects where I get the HTML source code from the page. I usually use the URL string and a Get method to get the source code like below:
[Code]....
The problem is that the page I am working with currently actually does a page redirect using a javascript function on the page like so:
[Code]....
I have been trying to figure out how to read in the the first page's HTML source code, post that HTML source back so it redirects, and then get the second page's HTML source code.
Following is the code to insert userName from session and PageName into table to keep record that how many times a user does hit a particular page.
To avoid repitition of code I want to put the code in one class and want to inherit same code in each page.
How to get this task? Please do share with me? Here is the OK code:
[Code]....
I want to read from database where I've stored a image in binary field and display a image.
while (reader.Read())
{
byte[] imgarr = (byte[])reader["file"];
Stream s = new MemoryStream(imgarr);
System.Drawing.Image image = System.Drawing.Image.FromStream(s);
Graphics g = Graphics.FromImage(image);
g.DrawImage(image, new Point(400, 10));
image.Save(Response.OutputStream, ImageFormat.Jpeg);
g.Dispose();
image.Dispose();
}
con.Close();
This piece of code doesn't work:
System.Drawing.Image image = System.Drawing.Image.FromStream(s);
I tried the code from this article. And I got the same mistake " the parameter is not valid ". Maybe I'm not aware of something, some setting in sql server or webconfig or sth else. Anyone else who has experience from fetching images from database? The parameter is not valid is the error message. db table contains data. What am I doing wrong?
Can a required field validator be called from the code behind page?We have several check boxes and some of them require the user to enter a date, but not all of them.(This is not a checkbox list, but individual checkboxes).Any 1 of 6 different checkboxes selected makes a txtBox visible for users to enter a date.If they don't select one of these checkBoxes which require a date - it doesn't matter, the form will still be valid.I don't think validation groups can work here so looking towards doing through .vbHere's the existing code:
Public
Sub chkBoxI_CheckedChanged(ByVal sender
As
[code]...
how to inject HTML code into text field and load it into the view,
I am giving the user the possibility to add/edit text on the page using Text-Box control.
My goal is to let the user add Url link into the page. Example:
The user enter the word "[[About us]]" and the system needs to translate it into
[Code]....
In the view i am using encoding: Html.Encode(Model.Page.Description).
I can write in the controller a method that will send to the view the correct syntax.
But the view encode all information therefore it's not working.
How sould i inject html code into existing text and load it into the view correctly ?
I have Gridview like this:
<asp:GridView ID="gvPartsSearchResult" runat ="server" CssClass="MRJ_TextGrid">
<Columns>
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:RadioButton
ID="rdButton"
runat="server"
AutoPostBack ="true"
onclick="javascript:CheckOtherIsCheckedByGVIDMore()"/>
<asp:HiddenField
ID="hdnFileExtension"
runat="server"
Value ='<%#Bind("FILE_EXTENSION")%>'/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I want to read the hidden field value when the user clicks on the radio button.
(using Ajax in the backhand) I am trying to set a value for a hidden field, when an id is changed. I am getting object reference not set error.
As of know i return the string value through callback and got it done in the front-hand.
Is there anyway that i can set the value in the code-behind when using Ajax methods.
I have a hidden field (hfUnsaved)in my child page . On keypress of my textbox i am setting the value into the hiddenfield using the following javascript function
[Code]....
On load: txtProject.Attributes.Add("onkeypress", "return Click('a');");
On button click i am removing the value from hidden field as follows:
[Code].....................
Wondering if it is possible to access a master page's hidden field (ex. <Input Type="Hidden" ID="TestHiddenField" Value="testValue"/>) From a Content Page's C# Pack CS Page.If it is possible, How do I go about doing so? I have tried:
PreviousPage.Master.FindControl("[TestHiddenField]") but no .Value attribute and no luck in general.
In my ASP.NET main page I have one hidden field and and one button. When the user clicks the button I am showing the pop up (child page). I need to access a Hidden field while the pop up is loading. How could I access the Hidden field using c#?
View 2 Replieshow to generate HTML code from the code behind?
I would like to build a form that generate an html code inside a for loop.
I will let the user enter the photo name and No. of photos
Then I will generate an HTML code like this:
<a href="http://www.mzinj.org/images/gallery/Photo%20(1).jpg" target="_blank"> <img src="http://www.mzinj.org/images/gallery/Photo%20(1).jpg" alt="" width="345" height="247" /> </a> <br /> <a href="http://www.mzinj.org/images/gallery/Photo%20(2).jpg" target="_blank">
<img src="http://www.mzinj.org/images/gallery/Photo%20(2).jpg" alt="" width="345" height="247" /> </a> <br /> <a href="http://www.mzinj.org/images/gallery/Photo%20(3).jpg" target="_blank"> <img src="http://www.mzinj.org/images/gallery/Photo%20(3).jpg" alt=""
width="345" height="247" /> </a> <br />
depending on the No. of the photos the code will be duplicated in the loop
Then I will display the result of the loop in label or in a textarea to let the user copy it any where
The problem is that while compiling my code it considers the HTML code as a part of the behind file and gives errors on the single quote, the double quote and on the parentheses
I have a page with a Textbox, a Button and a Label control. On Button_Click event , I store the value of Textbox in a variable called S using code behind.
I want to show the value of S in the Lable control using inline code but not using the code behind. ?
I'm using CRv9 and want to make use of Google Charts API for generating QR code on fly (in asp .net) and display it in the Crystal Report in a PDF format.I have spent the whole day looking for solution with no luck. The way we output the report is we use .rpt file, feed it with data and use Response.OutputStream to feed to browser. No CrystalReportViewer control hence CSS solution is not an option.
Now, I got as far as added an OLE Object from file with Link, which I would be overwriting every time the new QR code is generated. I apreciate that CR requires it to be a bitmap, so I was planning to download and convert the google's generated PNG file to BMP, that's not an issue. The problem is that Image in the report does not update after I replace the file. Meaning, it displays the original image, which was added as an OLE Object.
If I open this report in CR designer, the image gets refresh/updated and I'd have to save changes to the report to see this new image next time I generate a PDF file.The question is really how to achieve a dynamic image in Crystal Reports 9? Remember, Picture object did not have a Graphic Location property until vXI, so I cannot use that.
Manipulations with DataSets is not an option either as we're not giving report a datasource, instead we just map the fields with FormulaFieldDefinitions.
sample qr code url: https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=Hello%20world&choe=UTF-8
From the master page of my ASP.NET site I need to set the value of a hidden field in every get and post request and then subsequently read it in the next request.The problem is that in the post request the code works fine but when the client sends a get request I am unable to read the value of the hidden field from teh Master Page. Is the hidden field the proper approach to this and if so how do I read the value set in the hidden field in the subsequent get request. If the hidden field is not the proper approach for this then what else should I use?
View 3 Replieshidden field value not persists on page refresh
View 5 RepliesHere is what im trying to do I want to, from my c# code-behind, get the code between 2 <asp:Content> tags that are located in one of my .apsx pages.
View 8 Replieswe can create hidden field and post the entire page to another server to transfer data.
Is there anyway to perform similar task, without using a webpage?
For example:
I want to write a function, to self trigger after a specific time.
The self triggered function will form a hidden field message, and send to another server to query some information.
This function will not able to perform a brownser redirection.
I am working on Scott Mitchell's ASP.Net in 24 hours book. I am running into what looks like a simple problem that is getting the best of me.
When a page loads, the UserId of the currently logged in user will be retrieved in the page Load event and placed into the Text value of a Label. But, when the page opens when I am running the app, I am getting an error in the lower left corner of the browser. When I open up the error message, I see this:
Webpage error details
Message: 'UserIDValue' is undefined
Line: 92
Char: 1
Code: 0
URI: http://localhost:51035/PhotoAlbum24hrs/PhotoAdmin/ManageCategories.aspx
Here is the web page's Load event (VB) code:
[Code]....
Here is line 92 and the surrounding lines from the page source when I run the app:
[Code]....
This matches what is in Scott's book. (Or else I have been looking at it too long and have missed something.)
If I make the UserId Label visible, I can see the logged in user's ID displayed on the page. So, what is going on here? Why am I getting this error?