Differences

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--- fieldcomponent_class [2021/10/08 21:10] – created sahl
+++ fieldcomponent_class [2022/11/30 13:22] (current) – [Adding the component to the form] sahl
@@ Line 59: / Line 59: @@
 // $componentfield can now be added to a form
 </code>
+For convenience the form also have an addComponent-function that does exactly the same as above in one line:
+<code php>
+$textcomponent = new TextComponent();
+$form->addComponent('Label for field', 'field_name', $textcomponent);
+</code>
+===== Backend field validation =====
+It is also possible to perform backend field validation inside the component. The FieldComponent class has a ''parse()'' function which can be overwritten, and functions exactly like the similar-named function in Field. FieldComponent also has the triggerError function to raise an error.
+So backend validation for the component above could look like:
+<code php>
+  function parse($value) : bool {
+    if ($value == 'cherry') {
+      $this->triggerError('You are not allowed to write \'cherry\' in this field!');
+      return false;
+    }
+    $this->value = $value;
+    return true;
+  }
+</code>