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Editorial Team
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Asked: 2026-05-20T12:07:53+00:00

I have a complex form It allows the user to create an IncomeDeclaration which

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I have a complex form

It allows the user to create an IncomeDeclaration which has many Activities.

This works fine when the markup for the Activities is like this:

 <tr>
            <td>SomeActivity
                <input type="hidden" value="13123" name="EconomicActivityIncomeDeclarations[0].EconomicActivityId" id="EconomicActivityIncomeDeclarations_0__EconomicActivityId">
            </td>
             <td>
                <input type="text" name="EconomicActivityIncomeDeclarations[0].GrossIncome" id="EconomicActivityIncomeDeclarations_0__GrossIncome" />
            </td>
   </tr>

<tr>
            <td>SomeActivity
                <input type="hidden" value="654654" name="EconomicActivityIncomeDeclarations[1].EconomicActivityId" id="EconomicActivityIncomeDeclarations_1__EconomicActivityId">
            </td>
             <td>
                <input type="text" name="EconomicActivityIncomeDeclarations[1].GrossIncome" id="EconomicActivityIncomeDeclarations_1__GrossIncome" />
            </td>
   </tr>

The problem is I am dynamically adding more activities through javascript.. which is rendering the newly created form elements like this

<tr>
            <td>SomeActivity
                <input type="hidden" value="987987" name="EconomicActivityIncomeDeclarations[1b117bc9-ce4b-46d5-9de0-77ba98b82fd0].EconomicActivityId" id="EconomicActivityIncomeDeclarations_1b117bc9-ce4b-46d5-9de0-77ba98b82fd0__EconomicActivityId">
            </td>
             <td>
                <input type="text" name="EconomicActivityIncomeDeclarations[1b117bc9-ce4b-46d5-9de0-77ba98b82fd0].GrossIncome" id="EconomicActivityIncomeDeclarations_1b117bc9-ce4b-46d5-9de0-77ba98b82fd0__GrossIncome" />
            </td>
   </tr>

The weird behavior I get is that when the first two (or more) have the regular format [0], 1… and so on and then I (through ajax) add more form elements the Post Action actually only binds the ajax elements to the Model…

So basically an IncomeDeclaration which has all 3 of the activities Im using here as example will only get the THIRD one (with the random characters) added to the IncomeDeclaration….

I know its a little complicated but if anyone knows why this behavior is happening I appreciate it…

btw, heres what Im using.
http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/

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1 Answer

  1. Editorial Team

    You may want to look at this post: http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx in the end Haacked talks about a helper he made to bind items when they aren’t a sequence.

    That said I usually take another route when I have a complex list. It will only work with javascript enabled though. On submit I build a json object representing the list. Then I use the json2 library to stringify the json and place it in a hidden field which get’s posted. On the serverside it’s easy to build the list by using the JavaScriptSerializer and it’s Deserialize method.

    This is a bit more work though. I would guess it ends up at about 8 rows of javascript and 2 rows of serverside code.

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