MVC 5 checking RadioButtonFor based on model

Question

I have a problem for which I just can't find a solution.

Checking button like this works:

@Html.RadioButtonFor(x => x.an2[0], 3, Model.an2[0]==3 
    ? new { id = "B", @checked = "checked" } : null)

But I also need to set id, how do I do that? This code:

@Html.RadioButtonFor(x => x.an2[0], 3, Model.an2[0]==3 
    ? new { id = "B", @checked = "checked" } : new { id = "B" })

Gives error:

Type of conditional expression cannot be determined because there is no implicit conversion between 'AnonymousType#1' and 'AnonymousType#2'

Which is beyond my understanding.

I suppose there should be a trivial solution to this?

While Sam Farajpour Ghamari's answer shows you how to create conditional html attributes, it is completely unnecessary in your case. You should never set the `checked` attribute when using `RadioButtonFor()`. The helper already sets it based on the value if the property your binding to (and if its not, then you have other problems with your code) — , Aug 09 '15 at 01:40
I tried and it doesen't work in my case. What I'm trying to create is a test, where user switches through partialviews and selects the answer he/she thinks is correct. If going to previous partialview I want that previously selected answer (radiobutton) is checked, but can be changed. With my code and Sam's correction, the wanted effect takes place. If I remove the "checked" part it does not, even though the model that contains an2 list is passed back and forth. — Mark_856, Aug 09 '15 at 02:28
Then there is something else wrong in your code, so perhaps you should also consider addressing that as well ") — , Aug 09 '15 at 02:34

Sam FarajpourGhamari · Accepted Answer · 2015-08-08T18:39:50.333

1

Cast them to object:

Html.RadioButtonFor(x => x.an2[0], 3, Model.an2[0]==3 
    ? (object)new { id = "B", @checked = "checked" } : (object)new { id = "B" });

edited Aug 08 '15 at 18:39

answered Aug 08 '15 at 18:33

That works! I didn't even know casting can be done in such case. – Mark_856 Aug 08 '15 at 21:58

score 0 · Answer 2 · edited May 23 '17 at 11:43

0

Check this link.

@{string id = ViewData.TemplateInfo.GetFullHtmlFieldId("radioTrue");}
@Html.RadioButtonFor(x => x.an2[0], 3, Model.an2[0]==3 ? new { id } : null)

A good example of this is here.

edited May 23 '17 at 11:43

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answered Aug 08 '15 at 18:39

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2 Answers2