Passing data from an HTML form via an array to $_POST

Question

The following is written in ASP.NET Razor.

I have a page that dynamically creates lines in an HTML form based on results from a database query. Each row in the result set corresponds to one row in the form. Each row has two input fields that I need to be able to pass via $_POST.

foreach (var @row in list) {
    <li>
        <span style="width: 100px; display: inline-block">@row.Name</span>
        <input type="text" name="time[]" />minutes on
        <input type="text" name="date[]" />
    </li>
}

My expectation is that I would then be able to access and iterate over the data like this:

var timeList = Request.Form["time"];
foreach (var time in timeList) {
    // Stuff
}

But this isn't working. I keep getting an "Object reference not set to an instance of an object" error for timeList. Is what I'm trying to do even possible? Any idea what's wrong?

Racil Hilan · Accepted Answer · 2014-03-09 08:08:58Z

1

Try removing the square brackets from your names:

foreach (var @row in list) {
    <li>
        <span style="width: 100px; display: inline-block">@row.Name</span>
        <input type="text" name="time" />minutes on
        <input type="text" name="date" />
    </li>
}

The loop will create duplicate names which forms arrays in HTML, so you get what you want. However, I'm not sure if that will work when the list has a single item, so test that.

answered Mar 9, 2014 at 8:08

Racil Hilan

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Comments

Alexander Chubutkin · Accepted Answer · 2014-10-30 13:16:04Z

Client HTML:

<form action="~/Page" method="post">
    <input type="hidden" name="product_0_id" value="0" />
    <input type="text" name="product_0_name" value="Prod. #1" />
    <input type="hidden" name="product_1_id" value="1" />
    <input type="text" name="product_1_name" value="Prod. #2" />
</form>

Server:

 string youGroupKey = "product";
 Dictionary<string, string>[] values = Request.Form
     .AllKeys
     .Where(k => k.StartsWith(youGroupKey))
     .GroupBy(k => k
         .Substring(youGroupKey.Length + 1, 1),
             (a, b) => {
                 return b
                     .ToDictionary(c => c
                         .Substring(youGroupKey.Length + 3), d => Request.Form[d]);
             }
      )
      .ToArray();

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