How can I check the current status of an asp panel? I want to check the current status of the panel as to whether it is enabled or disabled. If it is enabled, then i'll do something in the code behind. Please help me to check it..
From code behind side you can check it as
if(PanelName.Enabled)
If it returns true that means it will post back.
I think you're looking for WebControl.Enabled property:
var isEnabled = panel.Enabled;
When the Enabled property of a control is set to false, the control
typically appears dimmed. If the control is an input element, the
browser prevents the user from clicking or typing in it. HTML elements
that are rendered for a server control are marked as disabled by
setting their disabled attribute or their CSS class attribute.
Related
I need some help on an issue, related with asp.net validators and postback.
The issue is that I have a page say 'p1' and it has a master page 'm1'. In addition to these I also have a usercontrol 'u1'.
Now, the issue is that on master page 'm1', I have a button that initiates a postback. And on my usercontrol 'u1', I have some fields which I need to check/validate and stop the postback if the fields are invalid.
I have tried using customvalidators and forcefully calling Page.Validate() method. But by doing this, I can see the page.IsValid property is false but sill the postback happens. I have even tried to write a return statement if the control fields are invalid but it doesn't helps..
Please note that I do not want to make any changes in the masterpage as this may have high impact on the other pages.
If clicking a button causes postbacks even when the page is invalid (as in your case it is proven with Page.IsValid property is False), then this means the button isn't configured to check for validations on the client side.
Solution 1:
You need to intialize the "CausesValidation" Property of the Button with the value True"
However, this requires changing the markup of the "Button" on the markup. And this isn't something you wish to perform.
Solution 2:
You can from within your page, access the Button of the Master page from within the Load Event and Initialize the CausesValidation property of the button to True.
Have a look at the following link to find the button from within the master page:
https://msdn.microsoft.com/en-us/library/xxwa0ff0.aspx
I am working on an ASP.NET/C# project in which we are placing a user control into an AJAX panel whose visibility is set to false on page load. The visibility of this panel is set to true once the user submits some parameters. However, although the user control and all of the other panel contents are visible once these parameters are set and submitted, the uc's javascript functions do not work.
I attempted to solve this issue by adding Page.Controls.Add(controlID) in Page_Load if it is not a postback. The functionality is all there when I do this, but I know that there is a better way to get the functionality because in this case the control is being added to the page twice.
EDIT: I put the controller in a div outside of the panel and got the control that I wanted out of it. However, if anyone can explain why the javascript of the control wasn't defined or offer a solution that keeps my UC in the panel, I would really appreciate it.
If for asp server control the visible property is set to false, then that control is not even rendered on the page. Since the User Control is inside the ajax server control, the user control is not rendered. Javascript code is executed by the browser hence it must be present on the page to run.
If you can set css property display: none to hide and display: block to show for the ajax server control, then user control and its javascript will be rendered on the page, however hidden from user for css property i set to display: none, so its javascript will be executed.
To set display property of ajax server control, you could use: ajaxControl.Styles.Add("display", "none").
Hope this helps you.
I have written a custom ASP.NET Server Control. When I am rendering the control, I check the this.Enabled property to determine if I should add the disabled attribute to my tag (extract of code below). Unless I specifically set the Enabled flag, this value is True regardless of the state of the panel it is in.
output.AddAttribute(HtmlTextWriterAttribute.Type, "text");
if (!this.Enabled)
{
output.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
}
output.AddAttribute(HtmlTextWriterAttribute.Value, this.DisplayName);
output.RenderBeginTag(HtmlTextWriterTag.Input);
output.RenderEndTag();
Standard server controls like textboxes etc, behave as expected in this scenario and are disabled.
What is the pattern that I must implement to be able to check if the control is actually to be disabled or not? Do you have to check the parent(s) to see if any of them are a Panel and then see if they are enabled? Seems very inefficient if that were the case.
Thanks
Mark
Just found it.
Needed to modify the code to:
output.AddAttribute(HtmlTextWriterAttribute.Type, "text");
if (!this.IsEnabled)
{
output.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
}
output.AddAttribute(HtmlTextWriterAttribute.Value, this.DisplayName);
output.RenderBeginTag(HtmlTextWriterTag.Input);
output.RenderEndTag();
How do you set the visibility of a (fileupload) control from ASP.net code (I need to hide a fileupload control in a webuser control from server site, otherwise hasFIle is always false).
Also setting the "Visible" property to false does not work (as is confuses the AJAX panel so the fileupload forgets that it has a file).
theFileUpload.Visible = false => does not work
so I want to try to set the CSS style visibility to hidden or display to none.
The main problem is I want to do it from the server side (I know how I could do it on client).
Is there a safe way to overwrite
theFileUpload.Attributes["styles"]
in case I modify other CSS styles in there,
also throwing a whole CSS class at it (by moidifying the CSSClass property) seems like overkill.
thanks in advance
Axel
By using theFileUpload.Visible = false; you just tells to asp.net to not render theFileUpload on the page.
You may use
theFileUpload.Attributes.CssStyle[HtmlTextWriterStyle.Visibility] = "hidden";
That allows you to set only a specific css property.
How do I setup a default setting so that if I do not set an OnClick (i.e the asp.net OnClick attribute) explicitly for an asp:LinkButton tag, it will not render an onclick(html attribute for javascript) attribute client side? By default, asp.net adds an onclick='doPostBack....' for the LinkButton.
Case for use:
There is a LinkButton tag on the page. For this page, if the user has one friend, I only want to run client side code if the button is clicked and would not for any reason want to make a post back. If the user has more than one friend I would want a click to trigger a postback.
Solutions that include the following are not helpful:
Using any asp.net Ajaxtoolkit
Dynamically switching the control type (i.e. if friends == 1 use a asp:Hyperlink)
-I want to avoid this because it is not scalable. There might be many cases where I want an asp:Link tag to do a postback or to not do a postback depending on the user context or user attributes
Using OnClientClick (I am using jQuery would like to avoid this)
Solution that would be helpful if possible:
If I could see server side at runtime whether an OnClick event was explicitly set on an asp:LinkButton tag, this would solve my problem, too. any ideas?
How about rather than dynamically switching the controls (as you mentioned is a solution you don't want), you could always use an asp:HyperLink and set the NavigateUrl property to redirect your page back to itself with a query string of some sort indicating what was clicked.
If you don't want the post to happen at all, simply leave the NavigateUrl property blank.
Of course, this will be pretty worthless if the rest of the page is dependent on ViewState and such.
http://forums.asp.net/t/1129106.aspx
This link explains how to see server side at runtime whether an OnClick event was explicitly set using reflection