C# – Make Html.CheckBoxFor return an integer

asp.netasp.net-mvcccheckboxhtml.checkbox

I want to bind a checkbox to an integer (the ISACTIVE value shown below) in ASP.net MVC.

@Html.CheckBoxFor(model => model.ISACTIVE, new { htmlAttributes = new { @class = "form-control" } })

I know that Html.CheckBoxFor only accepts bool as input and I could add a new property on my Model, but I'm using an already existing database and every time it updates, the Model gets refreshed.

Is there a way to create a new method for CheckBoxFor that would return an integer based on if the box is checked or not?

Best Answer

You could also try using simple HTML input control for checkbox type. That way, you can assign some value or name to it and return it to the controller as well.

This might not be the exact thing that you are trying to achieve. It would give you an idea though.

In your view :

<input type="checkbox" id="yourId" name="selectedIds" value="@menu.Id"/>

In your controller, you can try accessing this particular control's value like this :

value = Request.Form["selectedIds"];

Hope this helps.

Related Solutions

C# – How to make Html.CheckBoxFor() work on a string field

One way is to create your own htmlhelper extension method.

    public static MvcHtmlString CheckBoxStringFor<TModel>(this HtmlHelper<TModel> html, Expression<Func<TModel, string>> expression)
    {
        // get the name of the property
        string[] propertyNameParts = expression.Body.ToString().Split('.');
        string propertyName = propertyNameParts.Last();

        // get the value of the property
        Func<TModel, string> compiled = expression.Compile();
        string booleanStr = compiled(html.ViewData.Model);

        // convert it to a boolean
        bool isChecked = false;
        Boolean.TryParse(booleanStr, out isChecked);

        TagBuilder checkbox = new TagBuilder("input");
        checkbox.MergeAttribute("id", propertyName);
        checkbox.MergeAttribute("name", propertyName);
        checkbox.MergeAttribute("type", "checkbox");
        checkbox.MergeAttribute("value", "true");
        if (isChecked)
            checkbox.MergeAttribute("checked", "checked");

        TagBuilder hidden = new TagBuilder("input");
        hidden.MergeAttribute("name", propertyName);
        hidden.MergeAttribute("type", "hidden");
        hidden.MergeAttribute("value", "false");

        return MvcHtmlString.Create(checkbox.ToString(TagRenderMode.SelfClosing) + hidden.ToString(TagRenderMode.SelfClosing));
    }

The usage is the same as CheckBoxFor helper (e.Value is a string)

@Html.CheckBoxStringFor(e => e.Value)

Html – What’s the proper value for a checked attribute of an HTML checkbox

Strictly speaking, you should put something that makes sense - according to the spec here, the most correct version is:

<input name=name id=id type=checkbox checked=checked>

For HTML, you can also use the empty attribute syntax, checked="", or even simply checked (for stricter XHTML, this is not supported).

Effectively, however, most browsers will support just about any value between the quotes. All of the following will be checked:

<input name=name id=id type=checkbox checked>
<input name=name id=id type=checkbox checked="">
<input name=name id=id type=checkbox checked="yes">
<input name=name id=id type=checkbox checked="blue">
<input name=name id=id type=checkbox checked="false">

And only the following will be unchecked:

<input name=name id=id type=checkbox>

See also this similar question on disabled="disabled".

Best Answer

Related Solutions

C# – How to make Html.CheckBoxFor() work on a string field

Html – What’s the proper value for a checked attribute of an HTML checkbox

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