This question already has answers here:
How do I make a checkbox required on an ASP.NET form?
(6 answers)
Closed 9 years ago.
I've looked at a dozen previous answers on here nothing has worked for me. I need a form where a checkbox must be checked in order to submit. I am using C# and am pretty new to it, I just found out the RequiredFieldValidator that works with text box's won't work with checkboxes so I need another way to do this.
On submit the data in the fields gets sent to a MS SQL database. I have more fields then the one's shown below but I thought I would condense it for this post and removed everything but one text box and the checkbox I need validated upon submit.
I'd like it to do this on submit:
<form id="form1" runat="server">
<asp:Label ID="NameLbl" runat="server" Text="Label"></asp:Label><asp:RequiredFieldValidator
ID="NameRFV" runat="server" ErrorMessage="NameTxtBox"></asp:RequiredFieldValidator>
<asp:TextBox ID="NameTxtBox" runat="server"></asp:TextBox>
<br />
<asp:Label ID="AliveLbl" runat="server" Text="Are you alive?"></asp:Label>
<asp:CheckBox ID="AliveChkBox" runat="server" />
<asp:Button ID="Submit" class="btn btn-primary" runat="server" Text="Submit" OnClick="Submit_Click" />
</form>
I've read about using CustomValidator but I can't get anything to function properly with it. People keep saying you need to compile/build your code for it to work and I simply don't no how to do that.
Will consider javascript options as well. I can also use a CheckboxList instead if you know of a better way to validate those.
In Submit_Click function, you could add a check for whether AliveChkBox.Checked is true. If it's false, you could show a MessageBox or something like that to inform user that it needs to be checked, then simply return from Submit_Click so that nothing will happen until it's checked.
You want to use
if (checkbox1.Checked)
btn1.enabled
else (checkbox1.disabled)
btn1.disabled
this.errorProvider1.SetError(checkbox1, "Must be checked to continue");
Here is the solution:
Code behind:
using System;
public partial class TestCheckBox : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "AliveScript", "<script>function CheckAlive(){ return document.getElementById('" + this.AliveChkBox.ClientID + "').checked; } </script>");
this.Submit.OnClientClick = "return CheckAlive();";
}
protected void Submit_Click(object sender, EventArgs e)
{
}
}
aspx page:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="TestCheckBox.aspx.cs" Inherits="TestCheckBox" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:Label ID="NameLbl" runat="server" Text="Label"></asp:Label>
<asp:RequiredFieldValidator ID="NameRFV" runat="server" ErrorMessage="NameTxtBox" ControlToValidate="NameTxtBox"></asp:RequiredFieldValidator>
<asp:TextBox ID="NameTxtBox" runat="server"></asp:TextBox>
<br />
<asp:Label ID="AliveLbl" runat="server" Text="Are you alive?"></asp:Label>
<asp:CheckBox ID="AliveChkBox" runat="server" />
<asp:Button ID="Submit" class="btn btn-primary" runat="server" Text="Submit" OnClick="Submit_Click" />
</form>
</body>
</html>
if (checkBox1.Checked == true)
button1.Enabled = true;
Use a code similar to this, just make it so button1 is not enabled on the properties
Related
I'm trying to use data binding to disable a button in ASP.NET, but the button remains enabled. What am I doing wrong? Here is my example program which demonstrates the problem.
Default.aspx:
<%# Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<div>
<asp:Button runat="server" Text="Button 1" Enabled="<%# false %>" /><br />
<asp:Button runat="server" Text="Button 2" Enabled="<%# PropertyReturnsFalse %>" /><br />
<asp:Button runat="server" Text="Button 3" Enabled="<%# StaticPropertyReturnsFalse %>" /><br />
<asp:Button runat="server" Text="Button 4" Enabled="true" /><br />
<asp:Button runat="server" Text="Button 5" Enabled="false" /><br />
</div>
</asp:Content>
Default.aspx.cs:
using System;
using System.Web.UI;
namespace WebApplication1
{
public partial class _Default : Page
{
public bool PropertyReturnsFalse
{
get { return false; }
}
public static bool StaticPropertyReturnsFalse
{
get { return false; }
}
protected void Page_Load(object sender, EventArgs e)
{
}
}
}
I expect button 4 to be enabled and buttons 1, 2, 3, and 5 to be disabled.
The actual result at run time is that buttons 1, 2, 3, and 4 are enabled, and only button 5 is disabled.
I know ASP.NET is matching the property names in the ASPX file to the code-behind, because if I change the ASPX file to a mismatch, I get an error. I get no error when the names match.
I set breakpoints on the property implementations. Neither breakpoint gets hit at run time.
Well, if you going to use a data bound expression for control? Then like a listbox, dropdown, gridview or anything else? Those expressions ONLY fire if you do a data bind on that control.
eg:
GridView1.DataBind();
So, in your case, if you want those expressions to "run" or be evaluated, then you need to execute a databind for that given control.
Hence this:
<div>
<asp:Button ID="btn1" runat="server" Text="Button 1" Enabled="<%# false %>" /><br />
<asp:Button ID="btn2" runat="server" Text="Button 2" Enabled="<%# PropertyReturnsFalse %>" /><br />
<asp:Button ID="btn3" runat="server" Text="Button 3" Enabled="<%# StaticPropertyReturnsFalse %>" />
<br />
</div>
<asp:Button ID="Button1" runat="server"
OnClick="Button1_Click" Text="Run binding code" Width="155px" />
And code behind then becomes this:
protected void Button1_Click(object sender, EventArgs e)
{
btn1.DataBind();
btn2.DataBind();
btn3.DataBind();
}
I mean, you probably don't want to use a data binding event for a button, since we not binding data to that button (at least in most cases we are not!).
So, you could dump use of data binding expression.
At this point one would be VERY tempted to change the "#" to a "=" which means a server side expression, but server controls with a runat=server don't allow such expressions, since they are already server side (they allow binding ones "#", but not server side ones "=".
So, this means you move that code to page load, like this:
protected void Page_Load(object sender, EventArgs e)
{
btn1.Enabled = false;
btn2.Enabled = PropertyReturnsFalse;
btn3.Enabled = StaticPropertyReturnsFalse;
}
So, sever side controls don't accept markup expressions like '<%= %>', since they are already server side code - and you can do what amounts to the same thing by placing such code in on-load. Those expressions would run each time on page load anyway - so, no big deal to place in page load.
but, databind() expressions can be used - but then you have to execute a databind for that given control for the binding expression to trigger.
I can't not to use Validation Group in asp.net c#.
I have searched solution in Google without success.
In this simple form asp.net the TextBox pcs is always validated even when the value is null or the value is not a number.
My code asp.net below, what is wrong?
HTML:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="pcs" runat="server" Width="100" CssClass="ddl_Class" ValidationGroup="First"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="pcs"
ErrorMessage="PCS !" Text="***" Display="None" ValidationGroup="First"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidatorPcs" runat="server" ControlToValidate="pcs"
ErrorMessage="PCS only number" Text="***" Display="None" ValidationExpression="^\d+$" ValidationGroup="First"></asp:RegularExpressionValidator>
<asp:ImageButton ID="btnSave" runat="server" ImageUrl="/Images/save_button.gif" OnClientClick="return confirm('Confirm ?');" ValidationGroup="First" CausesValidation="true" />
<asp:ValidationSummary ID="First" runat="Server" ShowMessageBox="true" />
</div>
</form>
</body>
</html>
EDIT 1
The problem is the OnClientClick event.
If delete this event in asp:ImageButton the validation group working.
Why?
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="pcs" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="pcs"
ErrorMessage="PCS !" Text="***" Display="Dynamic"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="pcs"
ErrorMessage="PCS only number" Text="***" Display="None" ValidationExpression="^\d+$" EnableClientScript="true"></asp:RegularExpressionValidator>
<asp:ImageButton ID="btnSave" runat="server" ImageUrl="/Images/save_button.gif" />
</div>
<asp:ValidationSummary ID="First" runat="Server"
ShowMessageBox="true" />
</form>
</body>
</html>
OnClientClick is a useful property introduced in ASP.NET 2.0 that allows us to add some client-side behavior to button control. Using is as simple as providing the script to be called when a button is clicked by a user:
<asp:Button runat="server" ID="Save"
OnClientClick="return confirm('Are you sure?');" />
The problem is that if you use it like that, client-side validation won't fire. Looking at the rendered HTML quickly explains the situation:
onclick="return confirm('Are you sure?');WebForm_DoPostBackWithOptions(...)"
As you can see, the validation doesn't even have a chance to fire (which happens when WebForm_DoPostBackWithOptions is called).
Solving the issue is simple (or not). All that has to be done is a little change in our OnClientClick script (a piece of code found somewhere on the Internet):
<asp:Button runat="server" ID="Save"
OnClientClick="if (!confirm('Are you sure?')) return false;" />
Now we only return false (preventing the submit) in case a user didn't confirm the action, otherwise, the rest of the script will be called thus firing validation.
The reason I said that it may not be a simple issue is the fact, that the validation happens AFTER the confirmation, which is not the best thing in my opinion. Why ask the user about saving his data if there are still errors on the form, of which we will inform him after he confirms that he wants to save it?
After analyzing a bit, the code responsible for dealing with OnClientScript, I have come to a conclusion, that solving this problem is not an easy task. It would require some dirty hacks on the server side to make it pretty or calling validation routines on the client, before displaying the confirmation dialog (keeping in mind that checking if there are validation routines present at all is necessary in this case).
Used From : http://vaultofthoughts.net/OnClientClickBreaksValidation.aspx
I am trying to capture in google analytics the data that is entered into a textbox. The code that I have so far is below, I am trying to capture the data by Javascript, but I can't seem to get it to work. The CMS Platform I am using is sitecore.
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="SalesRepSearch.ascx.cs" Inherits="USEndoscopy.Website.layouts.USEndoscopy.Sublayouts.SalesRepSearch" %>
<%# Import Namespace="USEndoscopy.Library.Search" %>
<script type="text/javascript">
var textbox = document.getElementById('txtZipCode'),
submitButton = document.getElementById('btnSalesRepSearch');
submitButton.onClick = function () {
_trackEvent('data-store', textbox.name, textbox.value, 0);
// 'data-store' can be replaced with whatever category of data you want, for sortability's sake
// the 0 can be replaced with any other numerical data you want - but it must be numerical
}
</script>
<p></p>
<p>
<asp:Panel DefaultButton="btnSalesRepSearch" runat="server">
<asp:TextBox ID="txtZipCode" runat="server" Width="300px"></asp:TextBox>
<asp:Button ID="btnSalesRepSearch" runat="server" CssClass="buttonregular" Text="Search" OnClick="btnSalesRepSearch_Click" />
<asp:RequiredFieldValidator ID="reqTxtZipCode" runat="server" ValidationGroup="ZipCode" ControlToValidate="txtZipCode" Display="Dynamic" ErrorMessage="Please enter a valid US Zip code" CssClass="error"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="regExTxtZipCode" runat="server" ValidationExpression="^\d {5}(-\d{4})?$" ValidationGroup="ZipCode" ControlToValidate="txtZipCode" Display="Dynamic" ErrorMessage="Please enter a valid US Zip code" CssClass="error"></asp:RegularExpressionValidator>
</asp:Panel>
</p>
<p>
<asp:Repeater ID="salesRepContainer" runat="server">
<ItemTemplate>
<%# ((SalesRep)Container.DataItem).RepName %><br />
<%# ((SalesRep)Container.DataItem).Phone %><br />
<%# ((SalesRep) Container.DataItem).Email %><br />
</ItemTemplate>
</asp:Repeater>
</p>
<p>
<sc:Text Field="InternationalMessage" runat="server" />
</p>
Did you check the source code of the rendered HTML? Has the ASP.Net WebControl ID's ended up as something completely different due being nested in the panel?
Maybe you should add a CSS class to these and use document.getElementsByClassName
If you are using jQuery then you could use the attributeEndsWith selector
$('input[id$="txtZipCode"]');
$('input[id$="btnSalesRepSearch"]')
It's because ASP.NET has changed the ID value of your textboxes at the time of rendering them.
If your running .net V4 or greater then add ClientIDMode="Static" to your textbox and
button. This tells .net to not change the ID of your control.
<asp:TextBox ID="txtZipCode" runat="server" ClientIDMode="Static" Width="300px"></asp:TextBox>
<asp:Button ID="btnSalesRepSearch" runat="server" ClientIDMode="Static" CssClass="buttonregular" Text="Search" OnClick="btnSalesRepSearch_Click" />
If your running less than .net 4 change your Javascript to: (.ClientID gets the ID that .net gave the control when it rendered it)
var textbox = document.getElementById('<%= txtZipCode.ClientID %>'),
submitButton = document.getElementById('<%= btnSalesRepSearch.ClientID %>');
UPDATE
You might be having an issue where your javascript function is trying to assign a click function to your button before your button is actually available on the DOM.
So try the following:
Javascript function
function btnSearchClick(){
var textbox = document.getElementById('txtZipCode');
// Change your google code to this:
_gaq.push(['_trackEvent', textbox.name, textbox.value, 0]);
return true;
}
And on your button add the property
onClientClick="return btnSearchClick()"
Say I have one full-page form, but within the form, there are two or more events that need to take place on submission: Login & Register
Site.Master:
<%# Master Language="C#" AutoEventWireup="true"
EnableViewState="true" CodeBehind="Site.Master.cs"
Inherits="Site.SiteMasterPage" %>
<!doctype>
<html>
<head runat="server">
<%-- stuff --%>
</head>
<body>
<form ID="MainForm" action="" runat="server">
<asp:Login id="LoginControl" runat="server" />
<asp:CreateUserWizard id="RegisterControl" runat="server" />
</form>
</body>
</html>
If my cursor is focused inside of an input type="text" for asp:Login, and I hit Return (with javascript off), the page submits, but I am not logged in.
The same thing happens when I attempt to register (filling out the createUserWizard and hitting the Return key instead of actually clicking "Register", firing some event)
Is there any non-JavaScript solution for getting the Return key to submit the proper, currently focused portion of the form?
The panel control allows you to define a default button within the scope of it's contents:
<asp:Panel runat="server" DefaultButton="submitButtonA">
<asp:LinkButton ID="submitButtonA" runat="server" Text="Submit A"/>
</asp:Panel>
<asp:Panel runat="server" DefaultButton="submitButtonB">
<asp:LinkButton ID="submitButtonB" runat="server" Text="Submit A"/>
</asp:Panel>
The default button sounds like it might be your friend tonight - http://msdn.microsoft.com/en-us/library/system.web.ui.htmlcontrols.htmlform.defaultbutton.aspx
Actually it might not be, I haven't ever tried it with no Javascript.
I am using ASP.NET 3.5.
When the user click on say btnSubmit I want to first execute some JavaScript code and then execute some C#/VB.NET code.
Is this possible? If so how would one do it?
Thanks in advance!
This is very simple:
http://msdn.microsoft.com/en-us/library/7ytf5t7k.aspx
<%# Page Language="C#" %>
<script runat="server">
protected void Button1_Click(Object sender, EventArgs e)
{
Label1.Text = "Server click handler called.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1" Runat="server"
OnClick="Button1_Click"
OnClientClick="return confirm('Ready to submit.');"
Text="Test Client Click" />
<br />
<asp:Label ID="Label1" Runat="server" text="" />
</form>
</body>
</html>
Have the JavaScript execute and then call a web service with xmlhttprequest from the javascript
There is onClientClick property - check this out http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.onclientclick.aspx
Of course, you simply add an onClick event all JS code is executed before the postback.
If the code is for validation and you decide you don't want to submit you can return false and it won't post.
<asp:Button OnClientClick="" />
Thanks for the answer guys!
To execute a function from code behind one would do this in VB.NET
Protected Sub btnSubmit_Click(blah blah) Handles btnSubmit.Click
ClientScript.RegisterStartupScript(Me.GetType(), "hiya", "Message()", True)
lblLabel.Text = "Hello my name is Etienne!"
End Sub