How to Create an Empty Html.DropDownlistFor & how to disable Html.TextBox

Question

I have the following code inside my asp.net mvc view:-

@Html.DropDownListFor(model => model.FirewallCustomer.CustomerVLANSID,null, null, null)
@Html.ValidationMessageFor(model => model.FirewallCustomer.CustomerName)
<div><span class="f">VLAN IP</span> @Html.TextBox("VLANIP", new { disabled = "disabled"})</div>

but the above code will raise an error on the DropDownListFor:-

There is no ViewData item of type 'IEnumerable' that has the key 'FirewallCustomer.CustomerVLANSID'.

and for the TexBox it will show the disabled = "disabled" inside the textbox body, instead of disabling it. can anyone adivce on how to solve my dropdownlist & my textbox problems??? Thanks`

in DropDownListFor try passing an empty values list, but not null — LINQ2Vodka
– LINQ2Vodka, Commented Nov 15, 2013 at 0:22
for TextBox: read its conctructor signature, you're putting html attribtes in the wrong place — LINQ2Vodka
– LINQ2Vodka, Commented Nov 15, 2013 at 0:24

Quan Truong · Accepted Answer · 2013-11-15 03:58:17Z

3

For textbox

@Html.TextBox("VLANIP", new { disabled = "disabled"}) change to

@Html.TextBox("VLANIP","Your Value", new { disabled = "disabled"}) . I would like to advise you change disabled = "disabled" to @readonly = "readonly".

For dropdown list, if you wanna create a empty dropdownList for, you have to convert you FirewallCustomer.CustomerVLANSID to SelectListItem and add empty value for it. Please post your action for this view, i can help you. Should try

Html.DropDownListFor(model => model.FirewallCustomer.CustomerVLANSID,Enumerable.Empty< SelectListItem >(),null)

edited Nov 15, 2013 at 3:58

answered Nov 15, 2013 at 3:34

Quan Truong

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