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Old May 19th, 2012, 03:11 AM
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Default I have a question about using a checkbox list inside a listview.

I was wondering if this could be implemented:

I have a listview of items and I have a separate database table that contains an item id along with a size.

When a user enters in an item they will be able to select sizes for it from a list of all available sizes. They may choose however many sizes they like for the particular item.

In the listview, when they go into edit mode I would like to populate a checkboxlist with whatever sizes they already have selected and let them change it up and save.

I was thinking that maybe I could get into the on_editing event and query the database with the primary key of the item to get at all the sizes associated with it and then programmatically populate the checkbox with the correct selections.

When they change them in edit mode I could try and into the on_updating event and figure out which checkboxes are selected and then send that to the database in code behind.


Would this approach work or is there a much easier and more elegant solution?

Any help would be appreciated. Imar
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Old May 19th, 2012, 08:54 AM
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This sounds reasonable to me.

Rather than a ListView with inserting / editing behavior, you could also hand-code a page like this for one specific item. It all depends on the data and how you want your user to interact with it.

Cheers,

Imar
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Old May 19th, 2012, 12:55 PM
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Quote:
Originally Posted by Imar View Post
This sounds reasonable to me.

Rather than a ListView with inserting / editing behavior, you could also hand-code a page like this for one specific item. It all depends on the data and how you want your user to interact with it.

Cheers,

Imar
I see. The thing is that this is just one option for the item. I will be also implementing the same checkboxlist for colors and they will be able to view and edit a number of other options for the item, as well as deleting it. I guess I could just put in my own edit button that redirects to a new page with the item id that was selected and have them do all the editing there on it's own page. It might be neater that way.

Thanks for the feedback.

Last edited by IceThatJaw; May 19th, 2012 at 12:58 PM.
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Old May 19th, 2012, 02:02 PM
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Quote:
I guess I could just put in my own edit button that redirects to a new page with the item id
Exactly. Or even better, use some nice overlay mechanism such as Fancybox and display the new page in an iframe so you never leave the original page.

Cheers,

Imar
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Old May 19th, 2012, 03:31 PM
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Originally Posted by Imar View Post
Exactly. Or even better, use some nice overlay mechanism such as Fancybox and display the new page in an iframe so you never leave the original page.

Cheers,

Imar
Oh, nice. That fancybox looks cool.

I got it to open up pages in an iframe in about 15min so I would say it was pretty straight forward.

I think I am going to go ahead and use it for the editing portions.

At this point I have not used very much Javascript except for Ajax update panels. Should you just assume that most browsers have Javascript enabled?

The site I am working on now is not going to be used for commercial purposes so I am not going to worry about the few users who might disable JS but when you design sites, do you make every feature work without the use of Javascript? Is that even worth doing? (I'd imagine it would be a pain in the ass)


Thanks for the fancybox reference.
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Old May 20th, 2012, 05:57 AM
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I don't have any statistics, but I think the number of people with JavaScript disabled is quite low. With so many features depending on JavaScript these days, it's hard to browse the web with JavaScript disabled.

However, it all depends on your site and target audience. Some governmental rules dictate that some sites should be usable without JavaScript. So, you should use JavaScript with care, and provide fallback mechanisms. Google for "JavaScript degrade gracefully" and "JavaScript progressive enhancement" to learn more about techniques to make that work.

Cheers,

Imar
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Old May 22nd, 2012, 10:11 PM
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Haven't meet that problem before.
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Old May 22nd, 2012, 11:05 PM
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Default

Quote:
Originally Posted by Imar View Post
I don't have any statistics, but I think the number of people with JavaScript disabled is quite low. With so many features depending on JavaScript these days, it's hard to browse the web with JavaScript disabled.

However, it all depends on your site and target audience. Some governmental rules dictate that some sites should be usable without JavaScript. So, you should use JavaScript with care, and provide fallback mechanisms. Google for "JavaScript degrade gracefully" and "JavaScript progressive enhancement" to learn more about techniques to make that work.

Cheers,

Imar

Hey Imar, I am having trouble repopulating my checkboxlist. I have 2 database tables, one for item colors and one for item sizes. They consist of an itemID and a size or color.

What I am trying to do grab all of the records for the item colors and item sizes by their itemID and then loop through all the checkboxes and compare them to the size or color. If they match I want to set that checkbox to selected.

I thought I had the code all figured out but it doesn't seem to work and I am having a hard time using the VS debugger. I honestly just wish I could simply output the variables to see what is going on.

This is my code:

HTML Code:
      <div class="checkboxlist">
        Sizes:
        <asp:CheckBoxList ID="CheckBoxListSizes" runat="server" 
          DataSourceID="ObjectDataSourceSizes" DataTextField="Size" DataValueField="ID">
        </asp:CheckBoxList>
      </div>
      <div class="checkboxlist">
        Colors:
        <asp:CheckBoxList ID="CheckBoxListColors" runat="server" 
          DataSourceID="ObjectDataSourceColors" DataTextField="Color" DataValueField="ID">
        </asp:CheckBoxList>
      </div>

Code:
            // get the items currently selected sizes from the database
            DavesDrums_DAL.ITEM_SIZEDataTable itemSizeDT =  itemSizeTA.GetDataByItemID(id);
            DavesDrums_DAL.ITEM_COLORDataTable itemColorDT = itemColorTA.GetDataByItemID(id);

            foreach (ListItem listItem in CheckBoxListSizes.Items)
            {
                foreach (DataRow datarow in itemSizeDT.Rows)
                {
                    if (listItem.Text.ToString() == datarow["Size"].ToString())
                       listItem.Selected = true;
                }
            }

            foreach (ListItem listItem in CheckBoxListColors.Items)
            {
                foreach (DataRow datarow in itemColorDT.Rows)
                {
                    if (listItem.Text.ToString() == datarow["Color"].ToString())
                        listItem.Selected = true;
                }
            }




EDIT - No worries! My code was correct, I just tried executing in the Page_Load event instead of the OnDataBound event. I feel so stupid!

Last edited by IceThatJaw; May 23rd, 2012 at 06:19 PM.
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