Hi all i have my form with some controls as follows
2 Radio buttons 1 Text Box, 1 Required field validator and a button
I wrote my sample code in such a way that if one radio button is selected i will enable or disable the text box that i will have.
I am having a required field validator which was set for text box available. Now what i need is when the control was disabled i don't want to perform the validation for this is it possible to do
Sample code
protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
TextBox1.Enabled = true;
}
protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
{
TextBox1.Enabled = false;
}
My design
<form id="form1" runat="server">
<div>
<asp:RadioButton ID="RadioButton1" runat="server" AutoPostBack="True" GroupName="g"
OnCheckedChanged="RadioButton1_CheckedChanged" ValidationGroup="g1" />
<asp:RadioButton ID="RadioButton2" runat="server" AutoPostBack="True" GroupName="g"
OnCheckedChanged="RadioButton2_CheckedChanged" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"
ErrorMessage="RequiredFieldValidator" ValidationGroup="g1"></asp:RequiredFieldValidator>
<asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="g1" /></div>
</form>
Validation should apply only when the control was enabled
Validators have an Enabled property that you can use:
protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
TextBox1.Enabled = RequiredFieldValidator1.Enabled = true;
}
protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
{
TextBox1.Enabled = RequiredFieldValidator1.Enabled = false;
}
I got this and works well for me
protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
{
TextBox1.Enabled = true;
Button1.CausesValidation = true;
}
protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
{
Button1.CausesValidation = false;
TextBox1.Enabled = false;
}
Related
I designed a simple page with, two text boxes, one checkbox, one button, and one label.
When I start I want to check the checkbox to make the button enabled, and then enter two numbers into the two textboxes, click the button to do addition, and show the result in the label.
But when I click the checkbox the page postback is not working; it's not writing Page is posted back on the page and the button is still disabled.
However, if I make the button enabled and do the addition it invokes the page postback and also invokes the checkedchanged method.
<asp:TextBox ID="txtFirst" runat="server"></asp:TextBox>
<asp:TextBox ID="txtSecond" runat="server"></asp:TextBox>
<asp:Label ID="result" runat="server"></asp:Label>
<td>
<asp:CheckBox ID="cboptions" runat="server" AutoPostBack="True"
onCheckedChanged="cboptions_CheckedChanged" />
</td>
<asp:Button ID="submit" runat="server" Text ="addition" onclick="Button_Click"/>
Code:
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack == true)
{
Response.Write("Page is posted back");
}
}
protected void cboptions_CheckedChanged(object sender, EventArgs e)
{
submit.Enabled = cboptions.Checked;
}
protected void submit_Click(object sender, EventArgs e)
{
int a = Convert.ToInt32(txtFirst.Text);
int b = Convert.ToInt32(txtSecond.Text)+a;
result.Text = b.ToString();
}
There were many formatting errors in your code, do it this way
Aspx
<asp:TextBox ID="txtFirst" runat="server"></asp:TextBox>
<asp:TextBox ID="txtSecond" runat="server"></asp:TextBox>
<asp:Label ID="result" runat="server"></asp:Label>
<asp:CheckBox ID="cboptions" runat="server" AutoPostBack="True"
onCheckedChanged="cboptions_CheckedChanged" />
<asp:Button ID="btn" runat="server" Text ="addition" onclick="Button_Click"/>
C#
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack == true)
{
Response.Write("Page is posted back");
}
}
protected void cboptions_CheckedChanged(object sender, EventArgs e)
{
btn.Enabled = cboptions.Checked;
}
protected void Button_Click(object sender, EventArgs e)
{
int a = Convert.ToInt32(txtFirst.Text);
int b = Convert.ToInt32(txtSecond.Text) + a;
result.Text = b.ToString();
}
I have a Ajax ModalPopupExtender in my page.On a button click currently using TargetControlId i am showing the pop up.My need is when i am clicking the button want to check some conditions from DB.If condition satisfies i want to show the pop up.Other wise no need of pop up.How can i do this?
<ajaxToolkit:ModalPopupExtender CancelControlID="btnCancel" BackgroundCssClass="modalBackground" runat="server" ID="PopupExtender" TargetControlID="btn" PopupControlID="Panel1"></ajaxToolkit:ModalPopupExtender>
protected void ButtonSave_Click(object sender, EventArgs e)
{
if (MyCondition == true)
{
modalPopUpConfirmation.Show();
}
else
{
Label1.Text = "The condition was false, so no modal popup!";
}
}
Try like this
protected void Button1_Click(object sender, EventArgs e)
{
PopupExtender.Show();
}
Call it dynamically.
<!-- Hidden Field -->
<asp:HiddenField ID="hidForModel" runat="server" />
<ajaxToolkit:ModalPopupExtender CancelControlID="btnCancel" BackgroundCssClass="modalBackground" runat="server" ID="PopupExtender" TargetControlID="hidForModel" PopupControlID="Panel1"></ajaxToolkit:ModalPopupExtender>
<asp:Button ID="btnShowPopup" runat="server" Text="Save Data"
OnClick="btnShowPopup_Click" />
Code Behind
protected void btnShowPopup_Click(object sender, EventArgs e)
{
if(Yourcondition)
{
PopupExtender.Show();
}
}
It kind of seems to me that there is an inherent difficulty in dynamically adding controls in ASP.NET Web Forms. Specifically, for a dynamically added control to be included in the ViewState, and have it's events properly wired up and so forth it is suggested that these be added during the Page_PreInit event.
That said, many times we'll probably want to add such controls according to an event, such as a user clicking a button. Control specific events like Click events always run after Init, and even after Load. Supposed the following .aspx....
<form id="form1" runat="server">
<div>
<asp:PlaceHolder ID="phAddresses" runat="server"></asp:PlaceHolder>
<br /><br />
<asp:Button ID="btnAddAddress" runat="server" Text="Add Another Address" OnClick="btnAddAddress_Click" />
...and the following .aspx.cs....
private static List<AddressUserControl> addresses = new List<AddressUserControl>();
protected void Page_PreInit(object sender, EventArgs e)
{
foreach (AddressUserControl aCntrl in addresses)
{
phAddresses.Controls.Add(aCntrl);
// Helper to find button within user control
addressButtonControl = findAddressControlRemoveButton(aCntrl);
addressUserControlButton.ID = "btnRemoveAddress" + addressCount;
addressUserControlButton.Click += new EventHandler(addressUserControlButton_Click);
addressCount++;
}
}
protected void btnAddAddress_Click(object sender, EventArgs e)
{
AddressUserControl aCntrl = LoadControl("~/UserControls/AddressUserControl.ascx") as AddressUserControl;
addresses.Add(aCntrl);
}
Now in the above situation the number of User Controls displayed is always one behind the number the user has actually added, because the Click event doesn't run until after PreInit, where controls must be added to the placeholder. I must be missing something here, because this seems inherent to the ASP lifecycle, and to require some 'hack' or other.
EDIT - Yeah for some reason EventHandlers I add during btnAddress_Click() won't run, only EventHandlers I add during Page_Init, or declaratively in markup. This is what I tried to do...
protected void btnAddAddress_Click(object sender, EventArgs e)
{
AddressUserControl aCntrl = LoadControl("~/UserControls/AddressUserControl.ascx") as AddressUserControl;
addresses.Add(aCntrl);
phAddresses.Controls.Add(aCntrl);
findAddressControlRemoveButton(aCntrl);
addressUserControlButton.ID = "btnRemoveAddress" + addresses.Count;
///////////////////////////////////////////////////////////////////////////////////
// ADDED EVENT HANDLER HERE
//////////////////////////////////////////////////////////////////////////////////////
addressUserControlButton.Click += new E ventHandler(addressUserControlButton_Click);
}
...but the event won't fire as I've said. Any ideas?
EDIT - Here's the markup for my AddressUserControl. There's no logic in the code behind file
<%# Control Language="C#" ClassName="AddressUserControl" AutoEventWireup="true" CodeBehind="AddressUserControl.ascx.cs" Inherits="XFAWithUserControl.UserControls.AddressUserControl" %>
<asp:Panel ID="pnlAddressForm" runat="server">
<asp:Label ID="lblStreet" runat="server" Text="Street Address"></asp:Label>
<asp:TextBox ID="txtStreet" runat="server"></asp:TextBox>
<br /><br />
<asp:Label ID="lblCity" runat="server" Text="City"></asp:Label>
<asp:TextBox ID="txtCity" runat="server"></asp:TextBox>
<br /><br />
<asp:Label ID="lblState" runat="server" Text="State"></asp:Label>
<asp:TextBox ID="txtState" runat="server"></asp:TextBox>
<br /><br />
<asp:Label ID="lblZip" runat="server" Text="Zip"></asp:Label>
<asp:TextBox ID="txtZip" runat="server"></asp:TextBox>
<br /><br />
<asp:Button ID="btnRemoveAddress" runat="server" Text="Remove Address" />
</asp:Panel>
right now my click event for btnRemoveAddress is just something silly like this...
private void addressUserControlButton_Click(object sender, EventArgs e)
{
Button thisButton = sender as Button;
thisButton.Text = "Why Hello";
}
but my goal is to have it remove the associated AddressUserControl, so that a user can add and/or remove an arbitrary number of AddressUserControls from the page by clicking buttons.
EDIT - Here's what I have now, still doesn't work
protected void btnAddAddress_Click(object sender, EventArgs e)
{
AddressUserControl aCntrl = LoadControl("~/UserControls/AddressUserControl.ascx") as AddressUserControl;
addresses.Add(aCntrl);
phAddresses.Controls.Add(aCntrl);
findAddressControlRemoveButton(aCntrl);
addressUserControlButton.ID = "btnRemoveAddress" + addresses.Count;
aCntrl.ChangeText += new EventHandler(addressUserControlButton_Click);
}
private void addressUserControlButton_Click(object sender, EventArgs e)
{
Button thisButton = sender as Button;
thisButton.Text = "Why Hello";
}
AddressUserControl.ascx
<asp:Panel ID="pnlAddressForm" runat="server">
<asp:Label ID="lblStreet" runat="server" Text="Street Address"></asp:Label>
<asp:TextBox ID="txtStreet" runat="server"></asp:TextBox>
<br /><br />
<asp:Label ID="lblCity" runat="server" Text="City"></asp:Label>
<asp:TextBox ID="txtCity" runat="server"></asp:TextBox>
<br /><br />
<asp:Label ID="lblState" runat="server" Text="State"></asp:Label>
<asp:TextBox ID="txtState" runat="server"></asp:TextBox>
<br /><br />
<asp:Label ID="lblZip" runat="server" Text="Zip"></asp:Label>
<asp:TextBox ID="txtZip" runat="server"></asp:TextBox>
<br /><br />
<asp:Button ID="btnRemoveAddress" runat="server" Text="Remove Address" OnClick="btnRemoveAddress_Click" />
</asp:Panel>
AddressUserControl.ascx.cs
public event EventHandler ChangeText;
protected void Page_Load(object sender, EventArgs e)
{
}
public void btnRemoveAddress_Click(object sender, EventArgs e)
{
if (this.ChangeText != null)
{
ChangeText(sender, e);
}
}
You need to have the logic in your click handler add to the panel's Controls collection as well as to the list of controls, like this:
protected void btnAddAddress_Click(object sender, EventArgs e)
{
AddressUserControl aCntrl = LoadControl("~/UserControls/AddressUserControl.ascx") as AddressUserControl;
addresses.Add(aCntrl);
phAddresses.Controls.Add(aCntrl);
}
UPDATE:
In your user control, you need to define an event that can be defined in the page that hosts the user control, like this:
AddressUserControl.cs (code-behind):
public event EventHandler RemoveAddress;
protected void removeAddressUserControlButton_Click(object sender, EventArgs e)
{
// Find out if the event has been set, if so then call it
if (this.RemoveAddress!= null)
{
RemoveAddress(sender, e);
}
}
Now on your page where you are using the user control, do this:
// Wire up the user control's event
nameOfUserControl.RemoveAddress += new EventHandler(addressUserControlButton_Click);
Finally, implement the addressUserControlButton_Click event:
protected void addressUserControlButton_Click(object sender, EventArgs e)
{
// Do your dynamic control creation here or whatever else you want on the page
}
I want that when the textbox is visible = false, the RequiredFieldValidator shouldn't run.
This is my aspx code:
<asp:TextBox runat="server" ID="txtAmt" MaxLength="7" Style="width: 100px;"/>
<asp:RequiredFieldValidator ValidationGroup="ln" runat="server" ControlToValidate="txtAmt"
Display="Dynamic" ErrorMessage="Required" />
Now in my code behind
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
txtAmt.Visible = false;
}
}
and yet in my button click handler, when I do a Page.IsValid, it returns false if textbox is empty. Any idea how to solve this issue?
Just assign an ID to the validator and disable it.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
txtAmt.Visible = false;
if(!txtAmt.visible) { txtamtValidator.Enabled=false};
}
}
using javascript you can achive this
<script type="text/javascript">
function txtAmtOff()
{
document.getElementById("txtAmt").style.display = 'none';
ValidatorEnable(document.getElementById("txtAmtValidator"), false);
}
function txtAmtOn()
{
document.getElementById("txtAmt").style.display = 'inline';
ValidatorEnable(document.getElementById("txtAmtValidator"), true);
}
</script>
I have 2 labels and 2 text boxes and 1 buttons displayed.
When the page loads the Name and Button (will be initially displayed). Later when i click on the Button i need to display the age label and textbox. How can i do this ?
<ol>
<li>
<asp:Label runat="server" AssociatedControlID="Name">
User name
</asp:Label>
<asp:TextBox runat="server" ID="Name" Width="167px" />
<asp:Button ID="Button1" runat="server" Text="Button" />
</li>
<li>
<asp:Label runat="server" AssociatedControlID="age">age</asp:Label>
<asp:TextBox runat="server" ID="age" TextMode="age" Width="240px" />
</li>
</ol>
code for button press
protected void Button1_Click(object sender, EventArgs e)
{
}
You could set the label/textbox Visible property to True in server side. Alternatively, you could use JavaScript to avoid post backs to the server.
Add OnClientClick to your button :
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="ShowLabel();"/>
and declare the JavaScript function on page:
<script type="text/javascript">
function ShowLabel() {
// Note that the client ID might be different from the server side ID
document.getElementById('lblAge').style.display = 'inherit';
}
</script>
You need to set the Label Display style to none initially.
<asp:Label ID="lblAge" style="display: none;" runat="server" AssociatedControlID="age">age</asp:Label>
Try below code:
You need to set Visible property of controls to True or False according to your requirement. By default, all controls are visible on the screen whenever they are added on the page.You need to do following thing:
You need to remove TextMode="age" as there is not any supported textmode of type age.
Need to define id of control if you want to access a control server side in code behind. So define the ID of Label that you put corresponding to Age textbox.
By Default age label and textbox will not be visible by using below code:
<asp:Label ID="lblAge" runat="server" AssociatedControlID="age" Visible="false">age</asp:Label>
<asp:TextBox runat="server" ID="age" Width="240px" Visible="false"/>
Code behind:
After button click age label and the textbox will be visible by using below code:
protected void Button1_Click(object sender, EventArgs e)
{
lblAge.Visible = true;
age.Visible = true;
}
First add id to elements and set visible false
<asp:Label runat="server" AssociatedControlID="age" Visible="false" Id="lbl1">age</asp:Label>
<asp:TextBox runat="server" ID="age" TextMode="age" Width="240px" Visible="false" />
button click event set visible true
protected void Button1_Click(object sender, EventArgs e)
{
lbl1.Visible = True;
age.Visible = True;
}
this is the basic concept of asp.net. you can use visible property of the control.
your TextMode enumeration is wrong. there is no Age enumeration for Textbox.TextMode TextMode
<li>
<asp:Label runat="server" AssociatedControlID="age" id="lblAge">age</asp:Label>
<asp:TextBox runat="server" ID="age" TextMode="age" Width="240px" />
</li>
in code behind
protected void Button1_Click(object sender, EventArgs e)
{
lblAge.Visible=true;
age.Visible=true;
}
protected void Page_Load(object sender, EventArgs e)
{
NameLabel.Visible = false;
NameBox.Visible = false;
}
protected void Button1_Click(object sender, EventArgs e)
{
NameLabel.Visible = true;
NameBox.Visible = true;
}