QueryParser Overview


The Smart QueryParser represents a utlity class for parsing DynamicLinq expressions to Smart.QueryBuilder value. It is used by the Smart.QueryBuilder in order to parse Linq expressions.

However the QueryParser is available as a stand alone class that extends the Smart.Utilities base class.

The QueryParser class allows to convert Smart.QueryBuilder value to DynamicLinq string expression. The Smart.QueryBuilder value represents an Array of nested Arrays where each nested Array represents a single query condition or group.


The Smart.Utilities.QuaryParser class exposes the following properties:

Property Type Description Optional
customOperations Array An array of objects. Each object complies with Smart.QueryBuilder customOperations property definition. no
fields Array An array of objects. Each object complies with Smart.QueryBuilder fields property definition. no
dynamicField Function A function that complies with Smart.QueryBuilder getDynamicField property definition. The function must return a fields object. yes

Detailed information regarding the properties is available in the Smart.QueryBuilder API documentation on the website.


The QueryParser class also exposes the following methods:

Method Arguments Description Return Type
toLinq Array Converts the array passed as an argument to DynamicLinq expression. The array should be a valid Smart.QueryBuilder value. String
toValue String Converts a string to Smart.QueryBuilder value. The string should be a valid Dynamic LINQ expression. Array

The QueryParser utility is part of the smart.filterbuilder.js file. In order to use it, the file must be imported first.

Here's an exmaple demo page that uses the QueryParser:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
    <!-- scripts -->  
    <script type="module" src="../../../source/modules/smart.querybuilder.js"></script> 
    <script type="module" src="index.js"></script>		 	

The index.js file contains the initialization code for the QueryParser:

const queryParser = new Smart.Utilities.QueryParser();

//Set the fields
queryParser.fields = [{ label: 'Id', dataField: 'id', dataType: 'string', filterOperations: ['list_not_contains'] }];

//Set the customOperations
queryParser.customOperations = [{ 
    label: 'List Not Contains', 
    name: 'list_not_contains',  
    expressionTemplate: '{0}.Any(!it.Contains("{1}"))' 

//Converts the linq to QueryBuilderValue
const queryBuilderValue = queryParser.toValue('id.Any(!it.Contains("one"))');

//Converts the QueryBuilder value back to Linq
const linq = queryParser.toLinq(queryBuilderValue);

The QueryParser class allows to set the properties directly on initialization. The constructor accepts three arguemnts: constructor(fields, customOperations, dynamicField). An instance of the class can be created like so:

const fields = [{ label: 'Id', dataField: 'id', dataType: 'string', filterOperations: ['list_not_contains'] }],
    customOperations = [{ 
        label: 'List Not Contains', 
        name: 'list_not_contains', 
        expressionTemplate: '{0}.Any(!it.Contains("{1}"))' 

const queryParser = new Smart.Utilities.QueryParser(fields, customOperations);

//Converts the Linq to QueryBuilder value

The dynamicField property allows to dynamically load additional fields that have not been set initially via the fields property. For example:

const dynamicField = () => ({ label: 'Id', dataField: 'id', dataType: 'string', filterOperations: ['list_not_contains'] }),
    queryParser = new Smart.Utilities.QueryParser([], customOperations, dynamicField);

//Converts the Linq to QueryBuilder value