A checkbox to select / unselect them all

Question

I want to create a checkbox that will have the "power" to check / uncheck a checkboxfor for each items presents in a list.

Here is part of the view as I built it right now (please bear with the false names and convention):

    <p>
        @using (Html.BeginForm("SendObj", "Manager"))
        {
            <p>
               Select / UnSelet All Items @Html.CheckBox("selectAll", true) 
            </p>
            <table id="objToSend">
                <tr>
                    <th>Obj Name</th>
                    <th>Number In Stock</th>
                    (...)
                </tr>
                @for (int i = 0; i < Model.Count(); i++)
                {
                    <tr>
                        <td>@Html.DisplayFor(x => x[i].m_OthObj.m_ObjName)</td>
                        <td>@Html.DisplayFor(x => x[i].m_NbInStock)@Html.HiddenFor(x => x[i].m_NbInStock)</td>
                        (...)
                    <div id="divChckBox">
                        <td>
                            @Html.CheckBoxFor(x => x[i].m_IsSelected)
                        </td>
                    </div>

                    </tr>
                }

            </table>
            <input type="submit" value="Send"/>
        }
    </p>

As for the "how", well, I have searched a bit around and I have tried this jquery script, but to no avail:

    **** EDIT ****

Here's a new jQuery based on the comments people posted below. The alerts are there on debug purpose, and both appears when needed:

    <script type="text/javascript">
    $(document).ready(function() {
        alert("The document is ready");
        $("#selectAll").click(function() {
            alert("The case has been clicked");
            var chkValue = $(this).is(":checked");
            $("#divChckBox").attr("checked", "checked");
        });
    });
    </script>

I do not mind using jquery, far from it, I just do not know how it works yet. Maybe that's why what I have in mind does not work.

Can anyone help me out? Thank you!

* EDIT *

I will add here what the rendered page gives out for the checkboxes:

<td><input checked="checked" class="chckBoxList" data-val="true" data-val-required="The m_IsSelected field is required." name="[0].m_IsSelected" type="checkbox" value="true" /><input name="[0].m_IsSelected" type="hidden" value="false" /></td>

Maybe that will give out more informations on what's going on.

Answer 1

As there are MANY comments around and many answers, here's my current code (which works!):

<script type="text/javascript">
    $(document).ready(function() {
        //alert("The document is ready");
        $("#selectAll").click(function() {
            //alert("The case has been clicked");
            var chkValue = $(this).is(":checked");
            $(".divChckBox").prop("checked", chkValue);
        });
    });
</script>
<p>
    @using (Html.BeginForm("SendObj", "Manager"))
    {
        <p>
            Select / UnSelet All Items @Html.CheckBox("selectAll", true) 
        </p>
        <table>
            <tr>
                <th>Card Name</th>
                <th>Number In Stock</th>
                (...)
            </tr>
            @for (int i = 0; i < Model.Count(); i++)
            {
                <tr>
                    <td>@Html.DisplayFor(x => x[i].m_OthObj.m_ObjName)</td>
                    <td>@Html.DisplayFor(x => x[i].m_NbInStock)@Html.HiddenFor(x => x[i].m_NbInStock)</td>
                    (...)
                    <td>
                        <input type="checkbox" name="itdoesnotmatter" class="divChckBox" checked="true"/>
                    </td>
                </tr>
            }

        </table>
        <input type="submit" value="Send"/>
    }
</p>

Now every checkboxes are checked or not depending on the state of the select all checkboxes! Thank you everyone. Now I need to solve the problem of "unlinking" the result of the checkbox in my controller because a behavior was linked to this. But it's another problem.

Answer 2

@Html.CheckBox("TheOneCheckBoxToRuleThemAll")

Change your current checkbox code to:

<td>@Html.CheckBoxFor(x => x[i].m_IsSelected, new{ @class = "checkGroup1"})</td>

The easiest Jquery ever (make sure to put it in document.ready like shown):

  <script type="text/javascript">
    $(document).ready(function () {
         //alert("the document is ready"); 
         $("#TheOneCheckBoxToRuleThemAll").click(function () {
              //alert("inside my click event");
              var chkValue = $(this).is(":checked");
              $(".checkGroup1").prop("checked", chkValue);
          });
     });
  </script>

EDIT:

My previous answer used the .attr() attribute. After testing, I had all sorts of trouble getting that to work. After referring to this SO post, I switched to using .prop() and everything magically began to function correctly.

• Jquery .Attr()
• Jquery .Prop()

EDIT:

In the example I've provided, your checkboxes MUST look like this:

<input name='itdoesnotmatter' id='donotcare' class='checkGroup1' />

also, do not use that stupid name that I put on there, use something easy like

@Html.CheckBox("MasterCheck")

Answer 3

I stand corrected: CheckBoxFor does NOT allow class setting

In your Helper

<div id="divChckBox">
  @Html.CheckBoxFor(x => x[i].m_IsSelected)
</div>

And then make your selector group by the class:

$("#divChckBox :checkbox").attr("checked", "checked");