populate boolean values in checkbox in mvc

Question

I have following fields Db table , I want populate those values in check boxes

    public Nullable<bool> Report_Users { get; set; }
    public Nullable<bool> Innovation_Discussion_User { get; set; }

this is specific row in above table

I'm expecting ,

empty check box if Values are NULL or FALSE
checked check box if values are TRUE

this is the syntax I've been used ,

            @Html.CheckBox("Report User", Model == null ? false : (Model.Report_Users == Model.Report_Users ? true : false), new { @value = "false"  }) Report User
             &nbsp; 
            @Html.CheckBox("Innovation Discussion User", Model == null ? false : (Model.Innovation_Discussion_User == Model.Innovation_Discussion_User ? true : false), new { @value = "false"  }) Innovation Discussion User

but this seems not poplate correct values,

both check boxes showing checked always

You cannot use a checkbox for a nullable bool. A checkbox has only 2 states (check/unchecked - or true/false) whereas bool? has 3 states (true/false/null). Make the property bool (not nullable) or use EditorFor(m => m.Report_Users) whicj will generate a dropdownlist with 3 values. — user3559349
– user3559349, Commented Jan 21, 2016 at 10:09

tchelidze · Accepted Answer · 2016-01-21 10:24:01Z

2

Try the following

@Html.CheckBox("Report User",Model?.Report_Users ?? false)

edited Jan 21, 2016 at 10:24

answered Jan 21, 2016 at 10:13

tchelidze

8,3781 gold badge33 silver badges51 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

hutchonoid · Accepted Answer · 2016-01-21 10:27:01Z

0

You can use GetValueOrDefault() on nullable types, this will return false for null values as false is the default value for a bool.

@Html.CheckBox("Report User", 
    Model.Report_Users.GetValueOrDefault()) Report User

edited Jan 21, 2016 at 10:27

answered Jan 21, 2016 at 10:12

hutchonoid

33.4k15 gold badges102 silver badges106 bronze badges

10 Comments

tchelidze Over a year ago

what if Model is null ?

hutchonoid Over a year ago

@tchelidze I can't understand why the model would be null in the first place. Can you? :)

user3559349 Over a year ago

Don't set new { @value = "false" } - CheckBox() generates 2 inputs, a checkbox with value="true" and a hidden input with value="false". This code would only ever post back false` no matter if it was checked or not

tchelidze Over a year ago

@hutchonoid have you never had scenario, while developing, where Model is null ? In this case Model.Report_Users can also be null and this will cause NullReference

user3559349 Over a year ago

@tchelidze - .GetValueOrDefault() cannot throw a NullReference - it returns false when the value if null

|

Collectives™ on Stack Overflow

populate boolean values in checkbox in mvc

2 Answers 2

Comments

10 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

10 Comments

Your Answer

Sign up or log in

Post as a guest

Related