This snippets works, but I think it can be optimized:

/* highlight input, if it is empty */
$(function() {
    var highlight_if_no_val=function () {
        $(this).toggleClass('highlight-input', !$(this).val());
    }
    $('#id_index-EditForm-gpnr').keyup(highlight_if_no_val).each(highlight_if_no_val);
}
);

Is there a simpler solution?

The .each(hightlight_...) is done to set the hightlight after the page loaded (it can be initial empty or initial filled).

This snippets works, but I think it can be optimized:

/* highlight input, if it is empty */
$(function() {
    var highlight_if_no_val=function () {
        $(this).toggleClass('highlight-input', !$(this).val());
    }
    $('#id_index-EditForm-gpnr').keyup(highlight_if_no_val).each(highlight_if_no_val);
}
);

Is there a simpler solution?

The .each(hightlight_...) is done to set the highlight after the page loaded (it can be initially empty or initially filled).

This snippets works, but I think it can be optimized:

/* highlight input, if it is empty */
$(function() {
    var highlight_if_no_val=function () {
        $(this).toggleClass('highlight-input', !$(this).val());
    }
    $('#id_index-EditForm-gpnr').keyup(highlight_if_no_val).each(highlight_if_no_val);
}
);

Is there a simpler solution?

This snippets works, but I think it can be optimized:

/* highlight input, if it is empty */
$(function() {
    var highlight_if_no_val=function () {
        $(this).toggleClass('highlight-input', !$(this).val());
    }
    $('#id_index-EditForm-gpnr').keyup(highlight_if_no_val).each(highlight_if_no_val);
}
);

Is there a simpler solution?

The .each(hightlight_...) is done to set the hightlight after the page loaded (it can be initial empty or initial filled).

This snippets works, but I think it can be optimized:

/* highlight input, if it is empty */
$(function() {
    var highlight_if_no_val=function () {
        $(this).toggleClass('highlight-input', !$(this).val());
    }
    $('#id_index-EditForm-gpnr').keyup(highlight_if_no_val).each(highlight_if_no_val);
    }
    );

Is there a simpler solution?

This snippets works, but I think it can be optimized:

/* highlight input, if it is empty */
$(function() {
    var highlight_if_no_val=function () {
        $(this).toggleClass('highlight-input', !$(this).val());
    }
    $('#id_index-EditForm-gpnr').keyup(highlight_if_no_val).each(highlight_if_no_val);
}
);

Is there a simpler solution?