ASP.NET MVC 5 How to remove or add attribute in Html.TextBoxFor

Question

In my MVC Application View I have @Html.TextBoxFor(m => m.Email, new { @class = "form-control", @readonly = "readonly" })

I need to remove the readonly-attribute when an if-statement occurs in my Controller. How can I, from the Controller, remove the attribute in the View, or add the attribute if I first remove it from the View and then change my if-statement?

Federico Dipuma · Accepted Answer · 2017-04-09 20:23:14Z

2

I understand that you want to conditionally add the readonly attribute to a textbox.

You may use ViewData for that, from your controller assign ViewData["IsEmailReadOnly"] to a boolean value

if(MyCondition())
    ViewData["IsEmailReadOnly"] = true;
else
    ViewData["IsEmailReadOnly"] = false;

And then inside your View:

@{
    object textBoxAttrs;
    if((bool) ViewData["IsEmailReadOnly"]) {
        textBoxAttrs = new { @class = "form-control", @readonly = "readonly" };
    }
    else
    {
        textBoxAttrs = new { @class = "form-control" };
    }
}

@Html.TextBoxFor(m => m.Email, textBoxAttrs)

edited Apr 9, 2017 at 20:23

answered Apr 9, 2017 at 17:31

Federico Dipuma

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4 Comments

JayPi Over a year ago

Thanks for answering! I'm getting the "Property or indexer 'ViewDataDictionary.Is Read Only' cannot be assigned to -- it is read only.

Federico Dipuma Over a year ago

I'm sorry, change the property name, IsReadOnly could be already implemented in ViewDataDictionary. I'm updating the answer.

JayPi Over a year ago

Not sure if I understand how ViewData works, but no i get the message: 'ViewDataDictionary' does not contain a definition for 'IsEmailReadOnly' and no extension method 'IsEmailReadOnly' accepting a first argument of type 'ViewDataDictionary' could be found (are you missing a using directive or an assembly reference?)

Federico Dipuma Over a year ago

Sorry for the mistake, I didn't had time to check myself. ViewData must be accessed like any dictionary. The answer is not corrected.

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