Cherry Bytes

Been doing heaps of stuff with jQuery lately, so thought I should start jotting down some of the more useable code that I have done.

A really useful bit of code was adding validation to check if at least one checkbox is checked. The following bit of code does that really easily.

First you will need to create a simple custom validator for your page:

<asp:CustomValidator ID="valCheckBoxes" runat="server"

                        ErrorMessage="You must select at least one checkbox"

                        ClientValidationFunction="CheckAnyCheckBoxChecked" Display="Dynamic"></asp:CustomValidator>

Once you have the validator, make sure that it has a ClientValidationFunction. You will then need to create this method. Using jQuery you can easily search for any checkbox that is checked. If none are checked, then throw the validation exception. Easy!!

<script type="text/javascript">

  function CheckAnyCheckBoxChecked(sender, args)

  {

    var isChecked = false;

    $("input[type=checkbox][checked]").each(

      function() {

         //Check if checkbox is checked

         if($(this).is(':checked'))

         {

            isChecked = true;

         }

      }

    );

    args.IsValid = isChecked;

    return;

  }

</script>

If you have specific checkboxes that you don't want to validate, then you can add a bit more jQuery to the script to check for specific items. Below I am doing a check on any checkbox that does not have the class 'NonMandatory' assigned to it (note:// I am using the parent check for the class as with ASP.NET the CSSClass of a checkbox is assigned to the span class that surrounds the checkbox control). 

<script type="text/javascript">

  function CheckAnyCheckBoxChecked(sender, args)

  {

    var isChecked = false;

    $("input[type=checkbox][checked]").each(

      function() {

        //Don't check for non mandatory check boxes

        if($(this).parent().hasClass('NonMandatory') == false)

        {

            //Check if checkbox is checked

            if($(this).is(':checked'))

            {

                isChecked = true;

            }

        }

      }

    );

    args.IsValid = isChecked;

    return;

  }

</script>

Twice in the past week I have had the issue in my MOSS code where it is throwing an exception:

"The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again"

As it turns out the problem isn't so had to fix. Basically you need to set FormDigestSettings to disabled. This can be done in your code as follows:

SPWebApplication webApp = site.WebApplication;
bool formDigestSettingsEnabled = webApp.FormDigestSettings.Enabled;
webApp.FormDigestSettings.Enabled = false;
//Do all your code in here where it is throwing the error..
webApp.FormDigestSettings.Enabled = formDigestSettingsEnabled;

This can also be fixed by turning off the security validation for an application in Central Admin (however I probably wouldn't recommend this):

Central Admin -> Application Management -> General Settings -> Turn security validation off

http://wiki.threewill.com/display/is/2007/10/.

Basically you need to call a javascript method called dispex() which will open the application for you (instead of opening the document as read only).

So within my code I already had my Hyperlink control (lnkDocumentDownload) which was populated by an SPListItem. This also has the URL of the document set in lnkDocumentDownload.NavigateUrl. This needs to be set for this to work, and of course for applications that don't have integration with SharePoint, they will just use this link to go to the document.

What I needed to additionally add to enable the launching of the application was:

lnkDocumentDownload.Attributes.Add(

Once I added this in, whenever I clicked the link in my control, it would behave in the same way as clicking on 'Edit in Microsoft Word'.

I also found some 'kind of' (not really) helpful documentation on the javascript methods on the Microsoft website here: http://msdn.microsoft.com/en-us/library/cc264013.aspx

'Longitude' is a third party product by BA Insight which extends SharePoint's search capabilities to deliver document page previews, relevance optimization, parametric navigation, enhanced sorting and a number of other additional features. In this presentation Clinton will cover MOSS Search and how businesses are using it, then will give a demo of Longitude highlighting how this can be used to extend SharePoint Search to deliver a more efficient and relevant search experience for end users.