将动态生成的字符串从视图传递到控制器

Question

I am using checkboxes to dynamically create a string of their values, only adding the associated value if the checkbox is selected. The values are comma separated.

Here is a codepen showing how I am doing this:

http://codepen.io/cavanflynn/pen/mJoybE

HTML:

<dl class="dropdown"> 
    <dt>
        <a href="#">
            <span class="hida">▼</span>     
        </a>
    </dt>
    <dd>
        <div class="mutliSelect">
            <ul class="ul">
                <li>
                    <input type="checkbox" value="Test 1" />PO Number
                </li>
                <li>
                    <input type="checkbox" value="ReturnAuthNumber" />RA Number
                </li>
                <li>
                    <input type="checkbox" value="StatusId" />Status
                </li>
                <li>
                    <input type="checkbox" value="ManufacturerId" />Manufacturer
                </li>
            </ul>
        </div>
    </dd>
</dl>
<p class="multiSel"></p>  

Javascript:

$(".dropdown dt a").on('click', function () {
      $(".dropdown dd ul").slideToggle('fast');
  });

  $(".dropdown dd ul li a").on('click', function () {
      $(".dropdown dd ul").hide();
  });

  function getSelectedValue(id) {
       return $("#" + id).find("dt a span.value").html();
  }

  $(document).bind('click', function (e) {
      var $clicked = $(e.target);
      if (!$clicked.parents().hasClass("dropdown")) $(".dropdown dd ul").hide();
  });


  $('.mutliSelect').on('click', function () {
      $('p.multiSel').html(
           $(this).find('input[type="checkbox"]:checked')
           .map(function(idx, elem) {
               return $(elem).parent().text().trim();
           })
           .get().map(function(text) {
               return "<span>" + text + "</span>";
           }).join(', '));
  });

Now, I am trying to hide this string in a view using @Html.Hidden and pass it to a controller action using a form.

So I changed the html of the paragraph to:

@Html.Hidden("selectedRows",new { @class="multiSel"})

and the JS to:

  $('.mutliSelect').on('click', function () {
      $('multiSel').html(
          $(this).find('input[type="checkbox"]:checked')
          .map(function(idx, elem) {
              return $(elem).parent().text().trim();
          }).get().map(function(text) {
              return text;
          }).join(', '));
  });

But I am just getting { class="multiSel"} passed to the controller in the string. I know I am missing pieces here, but what would be the best way to adjust this to pass the hidden string to the controller.

Form Submit:

@using (Html.BeginForm("RunQuery","Report"))
{
    <dl class="dropdown"> 
        <dt>
            <a href="#">
                <span class="hida">▼</span>     
            </a>
        </dt>
        <dd>
            <div class="mutliSelect">
                <ul class="ul">
                     <li>
                         <input type="checkbox" value="Test 1" />PO Number
                      </li>
                      <li>
                         <input type="checkbox" value="ReturnAuthNumber" />RA Number
                      </li>
                      <li>
                         <input type="checkbox" value="StatusId" />Status
                      </li>
                      <li>
                         <input type="checkbox" value="ManufacturerId" />Manufacturer
                      </li>
                  </ul>
              </div>
          </dd>
      </dl>

      @Html.Hidden("selectedRows",null,new { @class="multiSel"})
      <button type="submit" class="btn btn-primary" id="btnGo">Go</button>
}

Controller Action:

[HttpPost]
public ActionResult RunQuery(string selectedRows)
{

}

Answer 1

You are passing htmlAttribute as input value consider this:

@Html.Hidden("selectedRows",null,new { @class="multiSel"})

instead of

@Html.Hidden("selectedRows",new { @class="multiSel"})

And you need to change your JS code to:

$('.mutliSelect').on('click', function () {
    $('#selectedRows').val(
        $(this).find('input[type="checkbox"]:checked')
            .map(function(idx, elem) {
                return $(elem).parent().text().trim();
            })
           .get().map(function(text) {
               return text;
           }).join(', ')
       );
   });