tweak for Bootstrap v4.0.0-beta

Author: mikoim

django_forms_bootstrap/templates/bootstrap/_field_errors.html

@@ -1,3 +1,3 @@
 {% for error in field.errors %}
-    <span id="error_{{ field.auto_id }}_{{ forloop.counter }}" class="error-msg">{{ error }}</span>
+    <div id="error_{{ field.auto_id }}_{{ forloop.counter }}" class="invalid-feedback">{{ error }}</div>
 {% endfor %}

django_forms_bootstrap/templates/bootstrap/_field_errors_block.html

@@ -1,3 +1,3 @@
 {% for error in field.errors %}
-    <p id="error_{{ field.auto_id }}_{{ forloop.counter }}" class="help-block">{{ error }}</p>
+    <div id="error_{{ field.auto_id }}_{{ forloop.counter }}" class="invalid-feedback">{{ error }}</div>
 {% endfor %}

django_forms_bootstrap/templates/bootstrap/_field_help_text.html

@@ -1,3 +1,3 @@
 {% if field.help_text %}
-    <p class="help-block">{{ field.help_text|safe }}</p>
+    <small class="form-text text-muted">{{ field.help_text|safe }}</small>
 {% endif %}

django_forms_bootstrap/templatetags/bootstrap_tags.py

@@ -14,13 +14,24 @@
 
 
 def _preprocess_fields(form):
+    invalid_form = True if len(form.errors) > 0 else False
+
     for field in form.fields:
         name = form.fields[field].widget.__class__.__name__.lower()
         if not name.startswith("radio") and not name.startswith("checkbox"):
+
+            if invalid_form:
+                if field in form.errors:
+                    validation_state = ' is-invalid'
+                else:
+                    validation_state = ' is-valid'
+            else:
+                validation_state = ''
+
             try:
-                form.fields[field].widget.attrs["class"] += " form-control"
+                form.fields[field].widget.attrs["class"] += ' form-control' + validation_state
             except KeyError:
-                form.fields[field].widget.attrs["class"] = " form-control"
+                form.fields[field].widget.attrs["class"] = ' form-control' + validation_state
     return form