QueryField: Prevent query runs on blur in Explore (#20180)

As discussed in a UX feedback session, it's annoying that queries are
automatically executed in Explore. This change adds props to override
the blur behavior.

- add `onBlur` to Explore query field props
- Explore's query row will pass down an empty function for onBlur to the
query fields
- pass onBlur through to the QueryField component for Loki and
Prometheus
- add test to QueryField to make sure if onBlur is specified, the
onRunQuery is not executed

packages/grafana-data/src/types/datasource.ts

@@ -281,6 +281,7 @@ export interface ExploreQueryFieldProps<
   TOptions extends DataSourceJsonData = DataSourceJsonData
 > extends QueryEditorProps<DSType, TQuery, TOptions> {
   history: any[];
+  onBlur?: () => void;
   onHint?: (action: QueryFixAction) => void;
 }
 

packages/grafana-ui/src/components/QueryField/QueryField.test.tsx

 import React from 'react';
 import { shallow } from 'enzyme';
 import { QueryField } from './QueryField';
+import { Editor } from 'slate';
 
 describe('<QueryField />', () => {
   it('should render with null initial value', () => {
@@ -17,4 +18,35 @@ describe('<QueryField />', () => {
     const wrapper = shallow(<QueryField query="my query" onTypeahead={jest.fn()} portalOrigin="mock-origin" />);
     expect(wrapper.find('div').exists()).toBeTruthy();
   });
+
+  it('should execute query on blur', () => {
+    const onRun = jest.fn();
+    const wrapper = shallow(
+      <QueryField query="my query" onTypeahead={jest.fn()} onRunQuery={onRun} portalOrigin="mock-origin" />
+    );
+    const field = wrapper.instance() as QueryField;
+    expect(onRun.mock.calls.length).toBe(0);
+    field.handleBlur(new Event('bogus'), new Editor({}), () => {});
+    expect(onRun.mock.calls.length).toBe(1);
+  });
+
+  it('should run custom on blur, but not necessarily execute query', () => {
+    const onBlur = jest.fn();
+    const onRun = jest.fn();
+    const wrapper = shallow(
+      <QueryField
+        query="my query"
+        onTypeahead={jest.fn()}
+        onBlur={onBlur}
+        onRunQuery={onRun}
+        portalOrigin="mock-origin"
+      />
+    );
+    const field = wrapper.instance() as QueryField;
+    expect(onBlur.mock.calls.length).toBe(0);
+    expect(onRun.mock.calls.length).toBe(0);
+    field.handleBlur(new Event('bogus'), new Editor({}), () => {});
+    expect(onBlur.mock.calls.length).toBe(1);
+    expect(onRun.mock.calls.length).toBe(0);
+  });
 });

packages/grafana-ui/src/components/QueryField/QueryField.tsx

@@ -27,6 +27,7 @@ export interface QueryFieldProps {
   // creating a two way binding.
   query: string | null;
   onRunQuery?: () => void;
+  onBlur?: () => void;
   onChange?: (value: string) => void;
   onTypeahead?: (typeahead: TypeaheadInput) => Promise<TypeaheadOutput>;
   onWillApplySuggestion?: (suggestion: string, state: SuggestionsState) => string;
@@ -171,11 +172,17 @@ export class QueryField extends React.PureComponent<QueryFieldProps, QueryFieldS
    * We need to handle blur events here mainly because of dashboard panels which expect to have query executed on blur.
    */
   handleBlur = (event: Event, editor: CoreEditor, next: Function) => {
-    const previousValue = this.lastExecutedValue ? Plain.serialize(this.lastExecutedValue) : null;
-    const currentValue = Plain.serialize(editor.value);
-
-    if (previousValue !== currentValue) {
-      this.runOnChangeAndRunQuery();
+    const { onBlur } = this.props;
+    if (onBlur) {
+      onBlur();
+    } else {
+      // Run query by default on blur
+      const previousValue = this.lastExecutedValue ? Plain.serialize(this.lastExecutedValue) : null;
+      const currentValue = Plain.serialize(editor.value);
+
+      if (previousValue !== currentValue) {
+        this.runOnChangeAndRunQuery();
+      }
     }
     return next();
   };

public/app/features/explore/QueryRow.tsx

@@ -57,6 +57,9 @@ interface QueryRowState {
   textEditModeEnabled: boolean;
 }
 
+// Empty function to override blur execution on query field
+const noopOnBlur = () => {};
+
 export class QueryRow extends PureComponent<QueryRowProps, QueryRowState> {
   state: QueryRowState = {
     textEditModeEnabled: false,
@@ -159,6 +162,7 @@ export class QueryRow extends PureComponent<QueryRowProps, QueryRowState> {
               history={history}
               onRunQuery={this.onRunQuery}
               onHint={this.onClickHintFix}
+              onBlur={noopOnBlur}
               onChange={this.onChange}
               data={queryResponse}
               absoluteRange={absoluteRange}

public/app/plugins/datasource/loki/components/LokiQueryFieldForm.tsx

@@ -172,6 +172,7 @@ export class LokiQueryFieldForm extends React.PureComponent<LokiQueryFieldFormPr
               onTypeahead={this.onTypeahead}
               onWillApplySuggestion={willApplySuggestion}
               onChange={this.onChangeQuery}
+              onBlur={this.props.onBlur}
               onRunQuery={this.props.onRunQuery}
               placeholder="Enter a Loki query"
               portalOrigin="loki"

public/app/plugins/datasource/prometheus/components/PromQueryField.tsx

@@ -297,6 +297,7 @@ class PromQueryField extends React.PureComponent<PromQueryFieldProps, PromQueryF
               query={query.expr}
               onTypeahead={this.onTypeahead}
               onWillApplySuggestion={willApplySuggestion}
+              onBlur={this.props.onBlur}
               onChange={this.onChangeQuery}
               onRunQuery={this.props.onRunQuery}
               placeholder="Enter a PromQL query"