Form onMount callback implemented. (#93)

* Form onMount callback implemented.

Author: DovydasNavickas

packages/simplr-forms/src/abstractions/base-form.ts

@@ -54,6 +54,13 @@ export abstract class BaseForm<TProps extends FormContracts.FormProps, TState> e
         }
     }
 
+    public componentDidMount(): void {
+        const props: TProps = this.props;
+        if (props.onMount != null) {
+            props.onMount(this.FormStore);
+        }
+    }
+
     abstract render(): JSX.Element | null;
 
     /*

packages/simplr-forms/src/contracts/form.ts

@@ -4,6 +4,8 @@ import { FormStore } from "../stores/form-store";
 import { FormErrorRecord } from "./error";
 import { FieldValidationType } from "./validation";
 
+export type FormOnMountCallback = (store: FormStore) => void;
+
 export interface FormProps {
     formId?: string;
     formStore?: FormStore;
@@ -12,6 +14,7 @@ export interface FormProps {
     disabled?: boolean;
     fieldsValidationType?: FieldValidationType;
     formValidationType?: FieldValidationType;
+    onMount?: FormOnMountCallback;
 }
 
 export type FormStateProps = FormProps & React.Props<any>;