Angular Condition Builder

Note

This is a folk of zebzhao's repo to maintence with the latest Angular

A modernized Angular 4+ query builder based on jQuery QueryBuilder. Support for heavy customization with Angular components and provides a flexible way to handle custom data types.

Installation

$ npm install @angular-ex/ngx-condition-builder --save

Basic Usage

app.module.ts

import { QueryBuilderModule } from "angular2-query-builder";
import { AppComponent } from "./app.component"

@NgModule(imports: [
  ...,
  QueryBuilderModule,
  IonicModule.forRoot(AppComponent) // (Optional) for IonicFramework 2+
])
export class AppModule { }

app.component.html

...
<query-builder [(ngModel)]='query' [config]='config'></query-builder>
...

app.component.ts

import { QueryBuilderConfig } from 'angular2-query-builder';

export class AppComponent {
  query = {
    condition: 'and',
    rules: [
      {field: 'age', operator: '<=', value: 'Bob'},
      {field: 'gender', operator: '>=', value: 'm'}
    ]
  };
  
  config: QueryBuilderConfig = {
    fields: {
      age: {name: 'Age', type: 'number'},
      gender: {
        name: 'Gender',
        type: 'category',
        options: [
          {name: 'Male', value: 'm'},
          {name: 'Female', value: 'f'}
        ]
      }
    }
  }
}

Custom Input Components

app.component.html

<query-builder [(ngModel)]='query' [config]='config'>
  <ng-container *queryInput="let rule; type: 'date'">
    <custom-datepicker [(ngModel)]="rule.value"></custom-datepicker>
  </ng-container>
</query-builder>

app.component.ts

query = {
  condition: 'and',
  rules: [
    {field: 'birthday', operator: '=', value: new Date()}
  ]
};

config: QueryBuilderConfig = {
  fields: {
    birthday: {name: 'Birthday', type: 'date', operators: ['=', '<=', '>']
      defaultValue: (() => return new Date())
    },
  }
}

Custom Styling (with Bootstrap 4)

app.component.html

<query-builder [(ngModel)]='query' [config]='config' [classNames]='classNames'></query-builder>

app.component.ts

classNames: QueryBuilderClassNames = {
  removeIcon: 'fa fa-minus',
  addIcon: 'fa fa-plus',
  arrowIcon: 'fa fa-chevron-right px-2',
  button: 'btn',
  buttonGroup: 'btn-group',
  rightAlign: 'order-12 ml-auto',
  switchRow: 'd-flex px-2',
  switchGroup: 'd-flex align-items-center',
  switchRadio: 'custom-control-input',
  switchLabel: 'custom-control-label',
  switchControl: 'custom-control custom-radio custom-control-inline',
  row: 'row p-2 m-1',
  rule: 'border',
  ruleSet: 'border',
  invalidRuleSet: 'alert alert-danger',
  emptyWarning: 'text-danger mx-auto',
  operatorControl: 'form-control',
  operatorControlSize: 'col-auto pr-0',
  fieldControl: 'form-control',
  fieldControlSize: 'col-auto pr-0',
  entityControl: 'form-control',
  entityControlSize: 'col-auto pr-0',
  inputControl: 'form-control',
  inputControlSize: 'col-auto'
}

Customizing with Angular Material

Example of how you can completely customize the query component with another library like Angular Material. For the full example, please look at the source code provided in the demo.

app.component.html

<query-builder [(ngModel)]='query' [config]='config'>
  <ng-container *queryButtonGroup="let ruleset; let addRule=addRule; let addRuleSet=addRuleSet; let removeRuleSet=removeRuleSet">
    <button type="button" mat-button (click)="addRule()">+ Rule</button>
    <button type="button" mat-button (click)="addRuleSet()">+ Ruleset</button>
    <button type="button" mat-button (click)="removeRuleSet()">- Ruleset</button>
  </ng-container>
  <ng-container *queryRemoveButton="let rule; let removeRule=removeRule">
    <button type="button" mat-icon-button color="accent" (click)="removeRule(rule)">
      <mat-icon>remove</mat-icon>
    </button>
  </ng-container>
  <ng-container *querySwitchGroup="let ruleset">
    <mat-radio-group *ngIf="ruleset" [(ngModel)]="ruleset.condition">
      <mat-radio-button value="and">And</mat-radio-button>
      <mat-radio-button value="or">Or</mat-radio-button>
    </mat-radio-group>
  </ng-container>
  <ng-container *queryField="let rule; let fields=fields; let onChange=onChange">
    <mat-form-field>
      <mat-select [(ngModel)]="rule.field" (ngModelChange)="onChange($event, rule)">
        <mat-option *ngFor="let field of fields" [value]="field.value">{{field.name}}</mat-option>
      </mat-select>
    </mat-form-field>
  </ng-container>
  <ng-container *queryOperator="let rule; let operators=operators">
    <mat-form-field>
      <mat-select [(ngModel)]="rule.operator">
        <mat-option *ngFor="let value of operators" [value]="value">{{value}}</mat-option>
      </mat-select>
    </mat-form-field>
  </ng-container>
  <!-- Override input component for 'boolean' type -->
  <ng-container *queryInput="let rule; type: 'boolean'">
    <mat-checkbox [(ngModel)]="rule.value"></mat-checkbox>
  </ng-container>
  <!-- Override input component for 'category' type -->
  <ng-container *queryInput="let rule; let field=field; let options=options; type: 'category'">
    <mat-form-field>
      <mat-select [(ngModel)]="rule.value" [placeholder]="field.name">
        <mat-option *ngFor="let opt of options" [value]="opt.value">
          {{ opt.name }}
        </mat-option>
      </mat-select>
    </mat-form-field>
  </ng-container>
  ...
</query-builder>

Property Bindings Quick Reference

query-builder

Name	Type	Required	Default	Description
allowRuleset	boolean	Optional	true	Displays the + Ruleset button if true.
allowCollapse	boolean	Optional	false	Enables collapsible rule sets if true.
classNames	object	Optional		CSS class names for different child elements in query-builder component.
config	QueryBuilderConfig	Required		Configuration object for the main component.
data	Ruleset	Optional		(Use ngModel or value instead.)
emptyMessage	string	Optional		Message to display for an empty Ruleset if empty rulesets are not allowed.
ngModel	Ruleset	Optional		Object that stores the state of the component. Supports 2-way binding.
operatorMap	{ [key: string]: string[] }	Optional		Used to map field types to list of operators.
persistValueOnFieldChange	boolean	Optional	false	If true, when a field changes to another of the same type, and the type is one of: string, number, time, date, or boolean, persist the previous value. This option is ignored if config.calculateFieldChangeValue is provided.
config.calculateFieldChangeValue	(currentField: Field, nextField: Field, currentValue: any) => any	Optional		Used to calculate the new value when a rule's field changes.
value	Ruleset	Optional		Object that stores the state of the component.

Structural Directives

Use these directives to replace different parts of query builder with custom components. See example.

queryInput

Used to replace the input component. Specify the type/queryInputType to match specific field types to input template.

Context Name	Type	Description
$implicit	Rule	Current rule object which contains the field, value, and operator
field	Field	Current field object which contains the field's value and name
options	Option[]	List of options for the field, returned by getOptions
onChange	() => void	Callback to handle changes to the input component

queryOperator

Used to replace the query operator selection component.

Context Name	Type	Description
$implicit	Rule	Current rule object which contains the field, value, and operator
operators	string[]	List of operators for the field, returned by getOperators
onChange	() => void	Callback to handle changes to the operator component
type	string	Input binding specifying the field type mapped to this input template, specified using syntax in above example

queryField

Used this directive to replace the query field selection component.

Context Name	Type	Description
$implicit	Rule	Current rule object which contains the field, value, and operator
getFields	(entityName: string) => void	Get the list of fields corresponding to an entity
fields	Field[]	List of fields for the component, specified by config
onChange	(fieldValue: string, rule: Rule) => void	Callback to handle changes to the field component

queryEntity

Used to replace entity selection component.

Context Name	Type	Description
$implicit	Rule	Current rule object which contains the field, value, and operator
entities	Entity[]	List of entities for the component, specified by config
onChange	(entityValue: string, rule: Rule) => void	Callback to handle changes to the entity component

querySwitchGroup

Useful for replacing the switch controls, for example the AND/OR conditions. More custom conditions can be specified by using this directive to override the default component.

Context Name	Type	Description
$implicit	RuleSet	Current rule set object which contain a list of child rules
onChange	() => void	Callback to handle changes to the switch group component

queryArrowIcon

Directive to replace the expand arrow used in collapse/accordion mode of the query builder.

Context Name	Type	Description
$implicit	RuleSet	Current rule set object which contain a list of child rules

queryEmptyWarning

Can be used to customize the default empty warning message, alternatively can specify the emptyMessage property binding.

Context Name	Type	Description
$implicit	RuleSet	Current rule set object which contain a list of child rules
message	string	Value passed to emptyMessage

queryButtonGroup

For replacing the default button group for Add, Add Ruleset, Remove Ruleset buttons.

Context Name	Type	Description
$implicit	RuleSet	Current rule set object which contain a list of child rules
addRule	() => void	Function to handle adding a new rule
addRuleSet	() => void	Function to handle adding a new rule set
removeRuleSet	() => void	Function to handle removing the current rule set

queryRemoveButton

Directive to replace the default remove single rule button component.

Context Name	Type	Description
$implicit	Rule	Current rule object which contains the field, value, and operator
removeRule	(rule: Rule) => void	Function to handle removing a rule

Dependencies

• Angular 8+