Jquery UI Datepicker not displaying

This may be helpful to someone. If you copied and pasted your form data (which has the datepicker input box, ensure you do not inadvertently copy the class="hasDatepicker"

This means your input box should look like this:

<input id="dateChooser" name="dateChooser" type="text" value=""/>

NOT

<input id="dateChooser" name="dateChooser" type="text" value="" class="hasDatepicker">

I made that mistake inadvertently. Removing the class and allowing the jQuery UI call appeared to fix it.

Hope that helps someone!

I was having the same problem, and I found that in my case the cause was the datepicker div for some reason is retaining the class .ui-helper-hidden-accessible, which has the following CSS:

.ui-helper-hidden-accessible {
 position: absolute !important;
 clip: rect(1px 1px 1px 1px);
 clip: rect(1px,1px,1px,1px);
}

I'm using the google CDN hosted versions of jquery, so I couldn't modify the code or the CSS. I had also tried changing the z-index without any success. The solution that worked for me was to set the clip property for the datepicker back to its default value, auto:

$('.date').datepicker();
$('#ui-datepicker-div').css('clip', 'auto');

Since this specifically targets the datepicker div, there's less of a chance of unintended side effects on other widgets than changing the ui-helper-hidden-accessible class as a whole.