C# - Order Of Postback Event Handler And Validate Method Of All Validator Controls?
Aug 11, 2010
I'm learning asp.net page life cycle. I find an article on MSDN [URL] It says that If the request is a postback, control event handlers are called. After that, the Validate method of all validator controls is called, which sets the IsValid property of individual validator controls and of the page. And the picture in the article also says validate fires after event handling. If this is true how can I get status of validator when I handling the event?
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Apr 6, 2010
I have problem with user control: MyCollection : UserControl
MyCollection contains:
[code]....
Works fine unless I register event for some button:
button1.Click += ...
When click on button, nothing happens - page does postback, refresh but event handler method is not executed. Generated HTML is bit strange. Every page control has correctly generated ClientID including parent container ID.
Button in this collection MyCollection has odd ClientID - itemsAddresses$button1
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May 3, 2010
I have a custom class (ServerSideValidator.vb) that validates user input on server side (it doesn't use any of the .NET built in validators, therefore Page.Validate() is not an option for me). I am calling the Validate() method on page.IsPostback event and the class performs without any problem
My issue is, when validation fails (returns false), I want to stop the postback event handler from firing, but load the page along with all the controls and user-input values in them. If I do, Response.End(), the page comes up blank. I can programmatically instruct the page to go to the previous page (original form before postback), but it loses all user-inputs.
I thought of creating a global boolean variable in the page code behind file and check the value before performing any postback method, but this approach takes away from my plan to provide all functionalities inside the class itself. The page object is being referenced to ServerSideValidator.
Seems like all the postback related properties/variables I come across inside Page class are 'Readonly' and I can't assign value(s) to control/prevent postback event from firing.
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Dec 22, 2010
I have a asp.net page with a button, the event the button needs to perform on it's click event needs to vary, dependant on what options are selected further up the page. The button itself is included in the master page, and it's actions are affected by selections made in the child page.
To do this, I have a method in the master page, that is called by the child page, when a users presses a button, that passes the Eventhandler to be used by that button, that is then assigned to masterpage eventhandler for that button:
public void assignEvent( EventHandler saveEvent)
{
this.SaveButtonEvent+= saveEvent
}
Then, when the save button on the master page, it calls that eventhandler
protected void save_Click(object sender, EventArgs e)
{
if (this.SaveButtonEvent != null)
{
this.SaveButtonEvent(this, e);
}
}
The event handler is assigned ok in the first section of code, however because pressing the save button causes a postback, the SaveButtonEvent event handler is set back to being null, and so nothing happens.
How can I preserve the contents of SaveButtonEvent Event Handler during postback, or is there a better way to be doing this?
EDIT:
I can get this to work by saving the EventHandler to the session, but this doesn't seem like a great idea.
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Apr 12, 2010
I have a control which has an ImageButton which is tied to an OnClick event... Upon clicking this control, a postback is performed and the event handler is not called. AutoEventWireup is set to true, and I've double checked spelling etc.... We haven't touched this control in over a year and it has been working fine until a couple of weeks ago.
We have made changes to controls which load this control... so I'm wondering, what kind of changes could we have made to stop this event handler from being called? There is quite a bit of Javascript going on, so this could be the culprit too...
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Feb 11, 2011
I've created a UserControl that is dynamically placed onto my page during the Init event. It populates and works great, but I'm left scratching my head at how to retrieve data from it during a postback.
It's effectively a multipick combobox that is manipulated entirely using clientside JavaScript (I'm using jQuery heavily). Inside the control container element, I render an empty DIV element that contains all of the selected items. As the user selects items, I generate DIVs within that container DIV that includes some markup. Of interest to me on the server side are the contents of a couple of INPUT fields.
After selecting an item, the rendered HTML looks something like:
[code]....
I may be completely off track and this may actually be impossible (or a stupid idea). The only alternative I can think of is to emit actual ASP.NET controls and hook the built-in event handlers.
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Feb 11, 2011
I have a div with "id=ShowDetails". In my javascript I have this:
$(document).ready(function () {
UIactions();
});
function UIactions () {
$('#ShowDetails').click(function () {
alert("bingo");
}
});
The div is inside the update panel that gets posted back. When the page loads, if I click the div, I get the bingo but after the postback, I don't.
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Jun 22, 2010
I am building a web site with visual web developer 2010
I have a class (autoButton) that adds a button to a panel (on Default.aspx) and a handler w/i the same class (classifyEventHandler)
The button appears fine, but when clicked the even doesnt fire, what am I doing wrong?
I tried locating the event handler in default.aspx, but it was not found :P
Imports Microsoft.VisualBasic
Public Class autoButton
Public Sub makeClassifyButton(ByVal theCell As Object)
Dim myButton As New Button
myButton.Text = "classify"
myButton.ID = "b_classify_" + theCell.ID
AddHandler myButton.Click, AddressOf classifyEventHandler
theCell.Controls.Add(myButton)
End Sub
Private Sub classifyEventHandler(ByVal sender As Object, ByVal e As EventArgs)
MsgBox("done?!")
End Sub
End Class
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Dec 8, 2010
In Page_Load, Request["__EVENTTARGET"] is an empty string.
IS there some way I can find out which button triggered the postback before hitting the buttons event handler?
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Oct 3, 2010
Is there a technical reason for the existence of Page.PreLoad or is this just convenience to have a place where you can neatly place code that always have to be executed before the Load code? Is there a difference between adding code in the PreLoad event handler and adding code at the top of the Load event handler? And what would be a typical scenario where you use PreLoad?
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Dec 28, 2010
I've set up a page that uses JavaScript to hide or show rows in an HTML table, depending on the state of a checkbox.
So far, so good. But this is a data entry form and some rows include validation controls. However, it appears that if I hide a row (using JavaScript: style.display = 'none') that contains a validation control, the control still validates on an attempt to postback.
way I can do this but have the validation controls not do anything if that row is hidden?
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Mar 5, 2010
I have a button in my aspx file called btnTest. The .cs file has a function which is called when the button is clicked.
btnTest_Click(object sender, EventArgs e)
How can I call this function from within my code (i.e. without actually clicking the button)?
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May 7, 2015
<cc2:DropDownCheckBoxes ID="cblCustomerList" runat="server" Width="180px">
<Style SelectBoxWidth="195" DropDownBoxBoxWidth="160" DropDownBoxBoxHeight="195"/>
<Items>
<asp:ListItem Text = "Kidneys Donor" Value = "Kidneys Donor"></asp:ListItem>
<asp:ListItem Text = "Lungs Donor" Value = "Lungs Donor" >Eye Donor</asp:ListItem>
<asp:ListItem Text = "Pancreas Donor" Value = "Pancreas Donor" >Blood Donor</asp:ListItem>
<asp:ListItem Text = "One" Value = "1">Heart Donor</asp:ListItem>
<asp:ListItem Text = "One" Value = "1" >Liver Donor</asp:ListItem>
[CODE]...
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Nov 27, 2013
How to validate if gridview is empty rows or not, i want to use ValidatorCalloutExtender.
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Sep 29, 2010
I got an event handler like this, in this event, i wanted to call another button click event. How can I do that?
[Code]....
if (ds.Tables[0].Rows.Count == 0)
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Aug 17, 2010
I want to use HTTP Handler in order to create a RSS feeds. For the purpose, I want to put my logic for creating the rss XML in C# class, which implement IHttpHandler, then to "map" this handler into the web.config file and to register the "mapped name" in my routing rules. I am doing something like this:
public class RSSFeedHandler:IHttpHandler
{
public void ProcessRequest( HttpContext context )
{
[code]...
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Feb 1, 2010
I have a web page which contains 3 drop down boxes followed by 3 textboxes. I am implementing Required field validators for all of them . But when i hit submit , The Page first checks for empty Textboxes before checking for any value in Drop down boxes , but i want the Drop down boxes to be validated first before Textboxes. How Can it be achieved?
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Oct 20, 2010
I've only been coding .net for a few months so fogive me if the answer to this is obvious.I have been hitting a repeated problem in my application to do with event order.My requirement is always the same:1. Display page with controls2. Pick up on some event with these controls3. based on that event do some calculations before displaying the next page4. Now display the next page taking into account what the user has clicked.One example is that I have a chart, and next to it several link buttons these filter the age of the x axis eg 1 Year, 2 Years, 3 years. On the click event I set a from date of 12 months, 24 months or 36 months. I then display my chart initialising it in the page load event. I have a number of other things going on in the pageload making it difficult to move all the code to the control event from page-load.Neither of the above senerios work and I assume this is because the page load / init events fires before the control events from the previous page (is this right?)To illustrate the point I have made a simple program below that does not work. I'd be grateful for any guidance on how to go about this type of interface.
[Code]....
[Code]....
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Jan 26, 2010
Is it possible to validate an entry using a validator if the inputted account number exists on the database?
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Apr 7, 2010
In desktop programming, I can usually find out which control has fired an event via using the following coding:
[Code]....
However in ASP.Net, button derives from System.Web.UI.WebControls.Button an does not feature an extension method for Name, therefore can anyone come up within something similar that will work in ASP?
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Jun 24, 2010
I have a webpage where I am displaying some data.
On the top of that I have a button. On click of this button I am calling my webhandler using jquery/json, passing in some data to this handler. Now this data can containg html tags. So whenever I try to click that button it gives that Potential threat script
error. So I thought let me include ValidateRequest = false to my webpage.
Now when i do this it never hits my handler. I tried to debug also but my breakpoint is never hit in my handler. How to handle this.
This is how I call my handler:
[Code]....
where hidden value is the value which I want to pass to my handler and may contain html tags..
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Sep 15, 2010
I am running the code below in a .net 2.0 content page.There are no containers such as wizard etc. When I click on the submission button for debugging purposes I get 'Nothing'. why I can't access the 'controlToValidate'?
Protected Sub validateCharacter(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
If Page.IsPostBack Then
Dim validationControl As CustomValidator = DirectCast(source, CustomValidator)[code]....
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May 7, 2015
I have two text boxes one is mobile no and another one is landline number . how to make any one of them as required..
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May 19, 2010
I'm looking to validate the length of a textarea using a regular expression validator. It should allow all characters and crlfs. I'm also concerned about crlfs counting as 1 or 2 characters, I'm concerned it may be different across browsers but I'm hoping ASP.NET regulates it. Also, I'm saving to a mix of varchar and nvarchar fields in MSSQL, do I need to be concerned about the way crlfs are saved there? I'm in a hurry to do this right, so I'll be researching all this on my own but I'm just hoping someone out there might have experience handling such concerns.
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Jun 30, 2010
I would like to validate the textbox for specific text and it must not be blank. But the regular expression validator is not validating if the text box is BLANK. However, it validates if I type something in the text box.
How can I make regular expression to trigger even if the text box is empty?
Should I use Required Validator + Regex Validator at the same time?
<asp:TextBox ID="txtcard" runat="server" MaxLength="16"></asp:TextBox>
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server"
ControlToValidate="txtcard" ErrorMessage="Please type credit card no"
ValidationExpression="^d{16}$"></asp:RegularExpressionValidator>
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