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Bo Damgaard Mortensen 719 posts 1207 karma points

Dec 01, 2010 @ 13:35

Confused about ASP.NET CheckboxList

Hi 'bracos!

I'm a bit lost here working with an asp:CheckboxList. The list displays several categories that is related (using the relationship api) to a document. The member is then able to edit the document and change the selected values(categories) and save the document.

So, in technical terms when a member clicks the 'Save' button I need to:

Check if the selected item/node is already related to the document, if not: make a new relation
For every item/node that's not selected, check to see if there is a relation to the document, if there is: delete it.

I almost wrote it in pseudo right there and it should be fairly straight forward in my eyes. I have the following code:


   spot2CategoryRelations = Relation.GetRelations(nodeId, spot2Category);
        foreach (Relation r in spot2CategoryRelations)
        {
            relatedCategories.Add(new Node(r.Parent.Id));
        }
        Node relatedNode = null;
        foreach (ListItem l in cbMemberTypes.Items)
        {
            int i = 0;
            bool found = false;
            while (!found && i < relatedCategories.Count)
            {
                if (l.Text.Equals(relatedCategories[i].Name))
                {
                    relatedNode = relatedCategories[i];
                    found = true;
                }
                i++;
            }
            if (l.Selected)
            {
                if(!Relation.IsRelated(relatedNode.Id, nodeId))
                {                   
                    Relation.MakeNew(nodeId, relatedNode.Id, spot2Category, nodeId + " is related to " + relatedNode.Name);
                }
            }
            else
            {
                foreach (Relation r in spot2CategoryRelations)
                {
                    if (Relation.IsRelated(nodeId, relatedNode.Id))
                    {
                        r.Delete();
                    }
                }
            }
        }

nodeId is the id of the document you are editing. I'm databinding my CheckboxList in the Page_Load event in a !Page.IsPostBack. The problem with the above code is:

It doesn't do anything about the relations. It's not creating one or deleting existent relations.
I don't like the nested loops! Is there a more elegant way of doing this, instead of my ninja-code? ;)

Any help/hint on this is appreciated!

Thanks in advance,

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Bo Damgaard Mortensen 719 posts 1207 karma points

Dec 01, 2010 @ 23:07

0

10 hours and I stil haven't found a solution to this problem :( just even more confused really. So, if anyone out there has got just the smallest hint on this, I will be more than happy! :)

Thanks!

Bo

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Rick Mather 42 posts 124 karma points

Dec 01, 2010 @ 23:14
0
I can't tell why it isn't working but if you want to simplify your code, you should be able to replace the entire 'while' block with this (untested):
```
relatedNode = relatedCategories.FirstOrDefault(x => x.Name.Equals(l.Text));
```
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Bo Damgaard Mortensen 719 posts 1207 karma points

Dec 02, 2010 @ 01:37

Beautiful! :)

Solved it by doing this:

foreach (ListItem l in cbMemberTypes.Items)
{
    if (l.Selected)
    {
        Node relatedNode = ca.SingleOrDefault(x => x.Name.Equals(l.Text));
        if (!Relation.IsRelated(relatedNode.Id, nodeId))
        {
            Relation.MakeNew(relatedNode.Id, nodeId, spot2Category, nodeId + " is related to " + relatedNode.Name);
        }
    }
}

Which is way more elegant and simple than my previous ninja-code! Thanks a lot Rick :) honestly don't know why I didn't think of the lambda-thingy..

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