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Binding bool value to checkbox in MVC 2 RSS

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Last post Jun 17, 2011 11:18 PM by shabeer.ak

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truongthang

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Binding bool value to checkbox in MVC 2

May 10, 2010 03:53 AM|LINK
I am getting problem with binding a bit datatype to check box (MVC 2 + MSSQL 2005 + EF).
```
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/EditForm.Master" Inherits="System.Web.Mvc.ViewPage<Framework.Models.job>" %>


...


<label>
    Is Hot
</label>
<%=Html.CheckBoxFor(model=>model.isHot) %>
```
I've already used an attribute to setting isHot field to false whenever it is NULL. It's still generate error message.
Below is my custom attribulte
```
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]

    public class BooleanAttribute : ValidationAttribute
    {
        public bool Value
        {
            get;
            set;
        }

        public override bool IsValid(object value)
        {
            return value != null && value is bool && (bool)value == Value;
        }

    }
```
Then I created an partial call to use this attribute

Could anybody suggest me how can I handle this?

Thanks in advance.
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Nguyen Van Truong Thang
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- Edited by truongthang on May 10, 2010 04:21 AM
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ignatandrei

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Re: Binding bool value to checkbox in MVC 2

May 10, 2010 04:17 AM|LINK

truongthang
I've already used an attribute to setting isHot field to false whenever it is NULL.

I do not know why you need an attribute when it's easier to do it in code ...But anyway, you can do the following

<%=Html.CheckBoxFor(model=>model.isHot.Value) %>

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mohd786hussa...

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Re: Binding bool value to checkbox in MVC 2

May 10, 2010 05:27 AM|LINK

Hi,

you can try the following :

<%=Html.CheckBoxFor(model=>model.isHot.HasValue?model.isHot.Value:false) %>

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- Edited by mohd786hussain on May 10, 2010 05:29 AM
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bradwils

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Re: Binding bool value to checkbox in MVC 2

May 10, 2010 06:42 AM|LINK

mohd786hussain

<%=Html.CheckBoxFor(model=>model.isHot.HasValue?model.isHot.Value:false) %>

<%= Html.CheckBoxFor(model => model.isHot ?? false) %>
- Marked as answer by ricka6 on May 18, 2010 11:29 PM
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truongthang

Member

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41 Posts

Re: Binding bool value to checkbox in MVC 2

May 10, 2010 06:54 AM|LINK

<%=Html.CheckBoxFor(model=>model.isHot.HasValue?model.isHot.Value:false) %>

I've tried this but it raised error on compile time.

Then I'm trying to use

<%= Html.CheckBoxFor(model => model.isHot ?? false) %>

It passed combine time but raised error on runtime because model.isHot is null.

Nguyen Van Truong Thang
Email: truongthang_ad@yahoo.com
- Edited by truongthang on May 10, 2010 06:59 AM
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truongthang

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41 Posts
Re: Binding bool value to checkbox in MVC 2

May 10, 2010 07:04 AM|LINK
<%=Html.CheckBoxFor(model=>model.isHot.Value) %>

It works well only isHot is not null in database otherwise it's still get error whenever isHot value is null. Below is my code to asign true or false.
```
public ActionResult Edit(int Id, FormCollection frmCollection)


{


...


if (!String.IsNullOrEmpty(frmCollection.GetValues("isHot.Value")[0]))
                {
                    bool isHot= Convert.ToBoolean(frmCollection.GetValues("isHot.Value")[0]);
                    obj.isHot= isHot;
                }


}
```
Nguyen Van Truong Thang
Email: truongthang_ad@yahoo.com
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ignatandrei

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Re: Binding bool value to checkbox in MVC 2

May 10, 2010 07:22 AM|LINK

truongthang

<%=Html.CheckBoxFor(model=>model.isHot.Value) %>

It works well only isHot is not null in database otherwise it's still get error whenever isHot value is null.

right - you've said in a previous post

truongthang

I've already used an attribute to setting isHot field to false whenever it is NULL.

So ... I do not understand where is the problem ...maybe your attribute isn't working well ?

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imran_ku07

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Re: Binding bool value to checkbox in MVC 2

May 10, 2010 09:20 AM|LINK

<%

bool isHot=false;

if(model.isHot.HasValue)

isHot=model.isHot.Value;

Response.Write(Html.CheckBoxFor(model=>isHot))

%>

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- Marked as answer by truongthang on May 10, 2010 10:26 AM
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truongthang

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Re: Binding bool value to checkbox in MVC 2

May 10, 2010 10:26 AM|LINK

I've tried your code . That's work properly. Thanks so much.

Nguyen Van Truong Thang
Email: truongthang_ad@yahoo.com
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shabeer.ak

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Re: Binding bool value to checkbox in MVC 2

Jun 17, 2011 11:18 PM|LINK
this single line of code would do the trick, even when the value is NULL.
```
<%=Html.CheckBox("isHot", Model.isHot ?? false) %>
```
- Edited by shabeer.ak on Jun 17, 2011 11:18 PM
- Edited by shabeer.ak on Jun 17, 2011 11:23 PM