Question

When a form is posted in my controller, I make the following check:

if(ModelState.IsValid)

If the model is not valid, errors are added to the ModelState. The model is then passed to the view with validation summary.

However, I want to check if the ModelState has errors from inside the jQuery ready handler, so that I can add some additional behavior if the form has errors. Is that possible?

Answer 1

You could spit global javascript variable:

<script type="text/javascript">
    var isValid = @Html.Raw(Json.Encode(ViewData.ModelState.IsValid));
</script>

and then:

$(function() {
    if (!isValid) {
        alert('opa');
    }
});