get values for a checkbox in mvc ,c#

Question

I have a form with some controls .Here I have a checkbox(on the view).In controller I call 2 functions : one for getting saved values and one for saving values. Tis functions works fine , but on my form I have always true , even it in my class I have false.

In controller I have :

return View("Settings", (K.NotificationsSettings)comm.Result);
// comm.Resultset return false form my gfield called Enabled

K.NotificationsSettings is a class which have this structure :

[DataContract] public class NotificationsSettings {
    [DataMember]
    public bool Enabled;                        
    [DataMember]
    public int Interval;                        

}

In my view first line is :

 <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Child.Master"      Inherits="System.Web.Mvc.ViewPage<K.NotificationsSettings>" %>

and code for this checkbox is :

< input id="Enabled" checked="checked" type="checkbox" name="Enabled" value ="<%=Model.Enabled%>"/>

But my checkbox is always true . Is necessary to put this "=Model.Enabled%>" ? Can somebody help me?

Marnix van Valen · Accepted Answer · 2011-11-30 08:57:58Z

1

You should use the appropriate Html helper for checkboxes:

<%: Html.CheckBoxFor( m => m.Enabled ) %>

The helper does something special; it outputs both a checkbox (with value="true") and a hidden input (with value="false"). The reason for this is that a checkbox will not post a value if it's not checked. Only values present in the posted date will be updated in modelbinding so if there is only a checkbox in your html form and you deselect it, the Enabled property is not updated.

edited Nov 30, 2011 at 8:57

answered Nov 30, 2011 at 8:51

Marnix van Valen

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2 Comments

Cr123 Over a year ago

I try to modify like here : <input id="Enabled" checked="checked" type="checkbox" name="Enabled" value ="<%: Html.CheckBoxFor( m => m.Enabled )%>" /> but nothing changed .I try with Model instead m but don't work

Marnix van Valen Over a year ago

You need to replace the entire <input ... /> with the code snippet in my answer. It will generate all the html markup you need.

Jan · Accepted Answer · 2011-11-30 08:56:09Z

0

To check a checkbox you have to include the attribute checked with no value:

<input type="checkbox" name="MyCheckbox" value="MyValue" checked>

The value of the attribute value is sent over the wire when you submit the form and the checkbox is checked.

But the better approach would be to use the HtmlHelper like Marnix suggested because that way you don't have to deal with the html creation yourself and you get model binding for free as well.

answered Nov 30, 2011 at 8:56

Jan

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