Added initial UI code

changedetectionio/forms.py

@@ -8,6 +8,7 @@ from wtforms import (
     PasswordField,
     RadioField,
     SelectField,
+    SelectMultipleField,
     StringField,
     SubmitField,
     TextAreaField,
@@ -343,6 +344,10 @@ class watchForm(commonSettingsForm):
     check_unique_lines = BooleanField('Only trigger when new lines appear', default=False)
     trigger_text = StringListField('Trigger/wait for text', [validators.Optional(), ValidateListRegex()])
     text_should_not_be_present = StringListField('Block change-detection if text matches', [validators.Optional(), ValidateListRegex()])
+    trigger_on_add = BooleanField('Additions', default=True)
+    trigger_on_del = BooleanField('Deletions', default=True)
+    trigger_on_modify = BooleanField('Modifications', default=True)
+
 
     webdriver_js_execute_code = TextAreaField('Execute JavaScript before change detection', render_kw={"rows": "5"}, validators=[validators.Optional()])
 

changedetectionio/templates/edit.html

@@ -156,6 +156,18 @@ User-Agent: wonderbra 1.0") }}
                             <span class="pure-form-message-inline">Good for websites that just move the content around, and you want to know when NEW content is added, compares new lines against all history for this watch.</span>
                         </div>
                     </fieldset>
+                    <fieldset>
+                        <div class="pure-control-group">
+                            <label for="trigger-type">Trigger On</label>
+                            {{ render_checkbox_field(form.trigger_on_add, class="trigger-type") }}
+                            {{ render_checkbox_field(form.trigger_on_del, class="trigger-type") }}
+                            {{ render_checkbox_field(form.trigger_on_modify, class="trigger-type") }}
+                            <span class="pure-form-message-inline">
+                                This filter only compares to the previous snapshot. This is different from the "Only trigger when new lines appear" setting which checks all previous snapshots.
+                                This is good for filtering out notifications for only content being removed.
+                            </span>
+                        </div>
+                    </fieldset>
                     <div class="pure-control-group">
                         {{ render_field(form.css_filter, placeholder=".class-name or #some-id, or other CSS selector rule.",
                         class="m-d") }}