Show ValidationSummary MVC3 as “alert-error” Bootstrap

Question

I want to show a ValidationSummary mcv3 with \"alert-error\" Bootstrap styling.

I\'m using a Razor view, and I show model errors with this code:

 @Html.V         


        

Answer 1

Expanding upon Daniel Björk's solution you can include a little script to adjust the CSS included with ValidationSummary() output. The resulting bootstrap alert was showing a rendering issue until I removed the validation-summary-errors class.

@if (ViewData.ModelState.Any(x => x.Value.Errors.Any())) {
   <div class="alert alert-danger">
      <a href="#" class="close" data-dismiss="alert">&times;</a>
      <h4>Validation Errors</h4>
      @Html.ValidationSummary()
   </div>
}

<script>
$(".validation-summary-errors").removeClass("validation-summary-errors");
</script>

You can also easily give a bootstrap highlight to fields with errors. See http://chadkuehn.com/convert-razor-validation-summary-into-bootstrap-alert/

Answer 2

If it needs to work with clientside javascript I suggests doing this:

  .validation-summary-valid {
    display: none;
  }

You still can assign the bootstrap class

@Html.ValidationSummary(null, new {@class= "alert alert-danger" })

but it will only show when you have actual errors.

Answer 3

To achieve the same in bootstrap 4, use the following:

 @if (ViewData.ModelState[""] != null && ViewData.ModelState[""].Errors.Count() > 0)
        {
            <div class="col-auto alert alert-danger" role="alert">
                @Html.ValidationSummary(true)
            </div>
        }

Answer 4

Based on the answers here:

@if (!ViewData.ModelState.IsValid)
{
    <div class="alert alert-danger">
        <button type="button" class="close" data-dismiss="alert">×</button>
        @Html.ValidationSummary(false, "Errors: ")
    </div>
}

(I'm using Bootstrap 4)

Answer 5

I took a slightly different route: using JQuery to hook into the form submit:

$('form').each(function() {
    var theForm = $(this);
    theForm.submit(function() {
        if ($(this).valid()) {
            if ($(this).find('.validation-summary-valid').length) {
                $('.validation-summary-errors').hide();
            }
        } else {
            if ($(this).find('.validation-summary-errors').length) {
                $('.validation-summary-errors')
                    .addClass('alert alert-error')
                    .prepend('<p><strong>Validation Exceptions:</strong></p>');
            }
        }
    });
});

I have this set inside a self-executing javascript module so that it hooks onto any validation summaries that I create.

HTH

Chuck

Answer 6

You can use jquery:

$(function(){
 $('.validation-summary-errors.alert.alert-error.alert-block').each(function () {
     $(this).prepend('<button type="button" class="close" data-dismiss="alert">×</button>');
 });
});

It is looking for every div containing given error classes from bootstrap and writing html at beginning of the div. I am adding .alert-block class as the bootstrap page says:

For longer messages, increase the padding on the top and bottom of the alert wrapper by adding .alert-block.