I want to set the Enable property of a RequiredFieldValidator control, depending on the Checked property of a CheckBox control. My controls are wrapped in an UpdatePanel. If I write the following code, everything works fine.
ASPX/HTML:
<asp:CheckBox
ID="chkIsEmailSubscribed"
runat="server"
OnCheckedChanged="chkIsEmailSubscribed_CheckedChanged"
AutoPostBack="true" />
<asp:TextBox
ID="txtSubscriptionEmail"
runat="server" />
<asp:RequiredFieldValidator
ID="rqrSubscriptionEmail"
runat="server"
ControlToValidate="txtSubscriptionEmail"
ErrorMessage="Email is required" />
Code-behind:
protected void chkIsEmailSubscribed_CheckedChanged(object sender, EventArgs e)
{
rqrSubscriptionEmail.Enabled = chkIsEmailSubscribed.Checked;
}
But I want to achieve this without writing any code in the code-behind and instead doing it in the HTML. I want to replace my code-behind logic with the following binding expression:
<asp:RequiredFieldValidator
...
Enabled="<%#chkIsEmailSubscribed.Checked%>" />
But this binding expression doesn't work as I expected. What's wrong with this?
I suggest you try to display the value of <%#chkIsEmailSubscribed.Checked%> from your front-end output.
Related
I have entered a value in text box and click the button the value should bind in a label.
The code must be in c# not in query. There is no database also.how please say the code behind in c#. It is button click event. while click the button the page should post back and bind the data how to bind a textbox value in a label box using c#. The value must bind in postback method.
easy , take a look at the below code:
<asp:TextBox Id="txt1" runat="server" />
<asp:button Id="btn1" runat="server" onClick="Button1_Click"/>
<asp:Label Id="lbl1" runat="server"/>
//in the code behind implement the Button1_Click
protected void Button1_Click (object sender, EventArgs e)
{
lbl1.Text= txt1.Text;
}
It as easy as the following:
LabelID.Text = TextBoxID.Text;
Where LabelID is the ID of your Label control and TextBoxID is the ID of your TextBox control.
You should place this code inside the button click's event.
Update
Please use for your purpose ASP.NET Web Server Controls.
<asp:TextBox ID="textBoxId" runat="server"/>
<asp:Label ID="labelId" runat="server"/>
Then you can access the values of Text property of both the above controls, like above:
labelId.Text = textBoxId.Text;
So I have this method that should run on TextChanged of a text box:
void CheckIn_TextChanged(object sender, EventArgs e)
{
checkIn.Text += "It Worked!";
}
In the aspx file I have this control:
<asp:textbox runat="server" id="checkIn" ClientIDMode="Static" AutoPostBack="true" TextChanged="CheckIn_TextChanged"></asp:textbox>
All the attributes work as they should except the TextChanged?
But if I remove this from the control and set it in the codebehind on page_load like so: checkIn.TextChanged = CheckIn_TextChanged; it does work?!
So my question is this why does it work when setting in codefile behind but not assigning the attribute to the control in the aspx file? Where am I going wrong?
Event name should be OnTextChanged. (Not TextChanged)
<asp:TextBox runat="server" ID="checkIn"
ClientIDMode="Static"
AutoPostBack="true"
OnTextChanged="CheckIn_TextChanged">
</asp:TextBox>
I realize there are lots of similar posts, however I have not found one that has worked for me unfortunately. Basically, I have an asp:customvalidator that I am trying to add to a validationgroup with other validators so that all error messages appear in the same alert. Here is the customvalidator
<asp:TextBox runat="server" ID="txtVideo1Url" Columns="20" Width="98%" />
<asp:CustomValidator runat="server" ID="valURL1" ControlToValidate="txtVideo1Url" OnServerValidate="txtVideo1Url_ServerValidate" Display="None" ValidationGroup="submission" />
and here is the event
protected void txtVideo1Url_ServerValidate(object sender, ServerValidateEventArgs e)
{
e.IsValid = false;
valURL1.Text = "FAIL!";
}
The event isn't firing at all and I have no idea why. Once I can get the event firing I can put some actual logic into it, lol
UPDATE: I've noticed that I am now able to get the event firing, however the validationsummary is set to display all errors in a messagebox and this error isn't getting added to the messagebox.
Remember to set this property on the CustomValidator...
ValidateEmptyText="True"
You need to set the CausesValidation property of the TextBox to true, like this:
<asp:TextBox runat="server" ID="txtVideo1Url" Columns="20" Width="98%" CausesValidation="true" />
You will have to add ValidationGroup="submission" to the ASP.NET control that will fire the postback.
CustomValidators don't fire if other Validators in your ASPx are not validating. You may need to force a Page.Validate("something"), with your specific validation group. I suggest look at OnTextChanged event to force a page validate.
I have a custom control included in a form that includes a dropdown list. The form has a number of other required fields, so i was wondering how to validate this dropdown.
<gaia:TextBox ID="TitleTextBox" runat="server"/>
<gaia:RequiredFieldValidator runat="server" ControlToValidate="TitleTextBox"
ErrorMessage="Please fill in the press release title" Text="*" Display="None" ValidationGroup="save" />
<CN:ProductCategoryDropDown runat="server" ID="ProductCategoryDropDown" />
<gaia:CustomValidator runat="server" ID="ProductCategoryValidator" OnServerValidate="ProductCategory_Validate" ValidationGroup="save"
Display="None" Text="*" ErrorMessage="Please select a category" />
the code behind looks like this
protected void ProductCategory_Validate(object source, ServerValidateEventArgs args)
{
args.IsValid = (ProductCategoryDropDown.SelectedValue>0);
}
On the customvalidator above, I purposely left out the 'ControlToValidate' because it throws an error.
Please help.
The easiest would be to include the CustomValidator in the UserControl.
Then you could provide a property for the Validation-Group and another ValidatorEnabled to set the validator group and enable/disable the validator.
I'm brand new at this, using vs2010 with asp.net and c#, and I'm trying to use a button click event to display forms on my "Add Product" page (the forms will be textbox/label based for inputting data), using items from a dropdownlist of products. Which methods are available/is there a 'best practice' for this sort of thing? I've been fooling around with an if (Dropdownlist.SelectedIndexChanged) statement, but I'm not quite clear on why the syntax requires the SelectedIndexChanged method to preclude a += or -=. Thoughts?
The SelectedIndexChanged method has the += because you are adding an event handler to a specific elements event. Is the button you click on the Add Product page? If so for the OnClick event you could just set your form details based on the DropDownList SelectedItem or SelectedIndex. You may also need to wrap that panel in an UpdatePanel so that it can update visibility without reloading the whole page.
<asp:UpdatePanel ID="updateFormPanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblName" runat="server" Text="" />
<asp:TextBox ID="txtDetails" runat="server" Text="" />
//More TextBox's or whatever you want
</ContentTemplate>
</asp:UpdatePanel?
<asp:DropDownList ID="ddlProductCategory" runat="server" />
<asp:Button ID="btnAddProduct" runat="server" OnClick="AddProduct_Click" Text="Add Product" />
//Code File Behind
protected void AddProduct_Click(Object sender, EventArgs e)
{
lblName.Text = ddlProductCategory.SelectedItem.Text;
txtDetails.Text = ddlProductCategory.SelectedItem.Value;
}