syncfusion-vue-data-manager

name	syncfusion-vue-data-manager
description	Implements Syncfusion Vue DataManager for local/remote binding, CRUD, querying, caching, and middleware. Supports JsonAdaptor, ODataAdaptor, ODataV4Adaptor, UrlAdaptor, WebApiAdaptor, WebMethodAdaptor, RemoteSaveAdaptor, GraphQLAdaptor, CustomDataAdaptor, and CustomAdaptor. Covers Query class, filtering, sorting, paging, grouping, persistence, offline mode, caching, and error handling.
metadata	{"author":"Syncfusion Inc","version":"33.1.44","category":"DataManager"}

Syncfusion Vue DataManager: Comprehensive Guide

When to Use This Skill

Reference this skill when you need to:

• Set up DataManager in Vue 2, Vue 3, or Quasar
• Bind data (local arrays or remote APIs)
• Query and filter data with the Query class
• CRUD operations (insert, update, delete)
• Choose an adaptor (10 types available)
• Add authentication via middleware/headers
• Optimize performance with caching
• Work offline with data persistence
• Pattern guidance for Composition API vs Options API

⚠️ Security & Trust Boundary

• This skill generates code only, the agent does not execute data operations or fetch remote endpoints — all DataManager interactions occur solely within the user's application at runtime.
• Generated code must treat all third-party API responses as untrusted input, never bind to unvalidated or user-provided URLs, and ensure authentication is enforced on all remote endpoints.

Key Concepts Overview

Concept	When to Use	Reference
Setup	Installing & initial config	setup-vue-2.md, setup-vue-3.md, setup-quasar.md
Data Binding	Connecting data sources	data-binding.md
Querying	Filtering, sorting, pagination	querying.md
CRUD	Insert, update, delete records	crud-operations.md
Adaptors	Choosing data source type	adaptors-guide.md
Caching	Performance optimization	caching.md
Middleware	Authentication, transformation	middleware.md
Headers	Custom HTTP headers	how-to-headers.md
Parameters	Send extra query params	how-to-parameters.md
Offline	Work without internet	how-to-offline.md

---

📊 Framework & API Coverage

Feature	Vue 2	Vue 3	Quasar	Composition	Options
Setup	✅	✅	✅	-	✅
Composition API	-	✅	✅	✅	-
Local Data	✅	✅	✅	✅	✅
Remote Data	✅	✅	✅	✅	✅
10 Adaptors	✅	✅	✅	✅	✅
CRUD	✅	✅	✅	✅	✅
Querying	✅	✅	✅	✅	✅
Caching	✅	✅	✅	✅	✅
Middleware	✅	✅	✅	✅	✅

---

🚀 Quick Start

Vue 3 Composition API (Recommended)

import { onMounted, ref } from 'vue';
import { DataManager, Query, ODataV4Adaptor } from '@syncfusion/ej2-data';

export default {
  setup() {
    const items = ref([]);

    onMounted(async () => {
      const dm = new DataManager({
        url: 'url',
        adaptor: new ODataV4Adaptor()
      });

      try {
        const result = await dm.executeQuery(new Query().take(10));
        items.value = result.result;
      } catch (error) {
        console.error('Error:', error);
      }
    });

    return { items };
  }
}

Vue 2 Options API

import { DataManager, Query, ODataV4Adaptor } from '@syncfusion/ej2-data';

export default {
  data() {
    return { items: [] };
  },
  mounted() {
    const dm = new DataManager({
      url: 'url',
      adaptor: new ODataV4Adaptor()
    });

    dm.executeQuery(new Query().take(10))
      .then((result) => {
        this.items = result.result;
      })
      .catch((error) => {
        console.error('Error:', error);
      });
  }
}

---

📖 Documentation Navigation

Getting Started (Choose Your Framework)

New to DataManager? Start here:

📄 setup-vue-2.md — Vue 2 with Options API

• Vue CLI installation
• Vue 2 lifecycle patterns
• First DataManager example

📄 setup-vue-3.md — Vue 3 with Composition & Options API

• Vite project setup
• reactive() vs ref()
• onMounted lifecycle
• Performance tips

📄 setup-quasar.md — Quasar Framework

• Quasar CLI bootstrap
• Boot file configuration
• Q-Grid integration
• Build optimization

---

Core Features

Understanding Data Binding:

📄 data-binding.md

• Local data binding (json property)
• Remote data binding (url + adaptor)
• Error handling by HTTP status
• Promise patterns

Manipulating Data (CRUD):

📄 crud-operations.md

• insert() — Add new records
• update() — Modify existing records
• remove() — Delete records
• Batch operations with saveChanges()
• keyField in update/remove methods

Querying & Filtering:

📄 querying.md

• from() — Specify resource
• select() — Choose fields
• where() — Filter conditions
• orderBy() — Sorting
• take/skip — Pagination
• search() — Full-text search
• group() — Data grouping

---

Data Adaptors (10 Types)

Selecting the Right Adaptor:

📄 adaptors-guide.md

• JsonAdaptor — Local in-memory arrays
• ODataAdaptor — OData v3 services
• ODataV4Adaptor — OData v4 endpoints
• UrlAdaptor — Generic REST APIs
• WebApiAdaptor — ASP.NET Web API (Items, Count format)
• WebMethodAdaptor — ASP.NET web methods
• RemoteSaveAdaptor — Client queries + server CRUD
• GraphQLAdaptor — GraphQL endpoints
• CustomDataAdaptor — Custom request/response
• CustomAdaptor — Extend built-in adaptors

Includes decision tree and comparison matrix.

---

Advanced Features

Performance Optimization:

📄 caching.md

• enableCache property
• How caching works
• Auto-clearing rules
• When to enable/disable

Request Customization:

📄 middleware.md

• applyPreRequestMiddlewares() — Modify requests
• applyPostRequestMiddlewares() — Transform responses
• Adding custom headers
• Authentication token injection

---

How-To Guides

Quick Solutions for Common Tasks:

📄 how-to-headers.md

• Adding static headers
• Dynamic headers per request
• JWT/Bearer authentication
• Content negotiation

📄 how-to-parameters.md

• Sending additional query parameters
• Custom API formats
• Different adaptor parameter styles

📄 how-to-offline.md

• Enabling offline mode
• localStorage persistence
• Sync strategies
• Conflict resolution

🔒 Security Warning: localStorage and sessionStorage store data unencrypted in the browser. Never store sensitive data (passwords, tokens, PII, payment info, user secrets, authentication credentials) in persisted TreeGrid state. State persistence is safe for UI state only (expand/collapse state, page number, sort order, column visibility, filter selections). For sensitive configuration or user data, use secure server-side session storage instead.

---

🎯 Common Patterns

Local Data Binding

// Vue 3 Composition API
import { ref } from 'vue';
import { DataManager, Query, JsonAdaptor } from '@syncfusion/ej2-data';

const items = ref([]);

const data = [
  { OrderID: 10248, CustomerID: 'VINET', Freight: 32.38 },
  { OrderID: 10249, CustomerID: 'TOMSP', Freight: 11.61 }
];

const dm = new DataManager({ json: data, adaptor: new JsonAdaptor() });
items.value = dm.executeLocal(new Query().take(10));

Remote Data with Error Handling

const dataManager = new DataManager({
  url: 'url',
  adaptor: new WebApiAdaptor()
});

dataManager.executeQuery(new Query().take(10))
  .then((result) => {
    console.log('Success:', result.result);
  })
  .catch((error) => {
    const statusCode = error.status;
    if (statusCode === 401) {
      console.error('Unauthorized - please login');
    } else if (statusCode === 404) {
      console.error('Data not found');
    } else if (statusCode === 0) {
      console.error('Network error');
    }
  });

Filtering with Vue 3 Composition API

import { ref, computed } from 'vue';
import { Query } from '@syncfusion/ej2-data';

const dm = new DataManager({ json: allData });
const searchText = ref('');

const filteredData = computed(() => {
  if (!searchText.value) return allData;
  
  return dm.executeLocal(
    new Query().where('CustomerID', 'contains', searchText.value)
  );
});

Authentication Middleware

🔒 Security Warning: localStorage and sessionStorage store data unencrypted in the browser. Never store sensitive data (passwords, tokens, PII, payment info, user secrets, authentication credentials) in persisted TreeGrid state. State persistence is safe for UI state only (expand/collapse state, page number, sort order, column visibility, filter selections). For sensitive configuration or user data, use secure server-side session storage instead.

const dataManager = new DataManager({
  url: 'url',
  adaptor: new WebApiAdaptor()
});

// Apply middleware to add auth token
dataManager.applyPreRequestMiddlewares([
  async (context) => {
    const token = localStorage.getItem('auth_token');
    context.request.headers['Authorization'] = `send_token`;
  }
]);

---

🔧 DataManager Configuration

const dataManager = new DataManager({
  // Data source
  url: 'url',        // Remote endpoint
  json: localArray,                            // Local array
  
  // Adaptor selection
  adaptor: new WebApiAdaptor(),              // Adaptor type
  
  // Headers & auth
  headers: [...],
  
  // Network settings
  crossDomain: true,                          // Enable CORS
  offline: false,                             // Offline mode
  enableCache: true,                          // Caching
  
  // Persistence
  enablePersistence: true,                    // Enable state persistence
  id: 'dataManager_vue',                      // Persistence ID
  ignoreOnPersist: ['temp', 'debug'],        // Properties to exclude
  timeZoneHandling: true                      // Timezone offset handling
});

---

❌ Common Errors & Solutions

Error	Cause	Solution
401 Unauthorized	Missing/expired auth token	Add middleware with fresh token
404 Not Found	Wrong endpoint URL	Verify API endpoint URL
0 (Network Error)	No internet connection	Enable offline mode
Cross-Origin Error	CORS not enabled	Set crossDomain: true

---

✅ Best Practices

1. Always set adaptor — Choose correct adaptor for your backend
2. Pass keyField in CRUD methods — Required as first parameter in update/delete
3. Use async/await — More readable than .then()/.catch()
4. Add error handling — Catch HTTP errors
5. Enable caching — Reduce server requests
6. Use middleware — Add auth globally
7. Test both APIs — Composition & Options patterns
8. Handle network errors — Status code 0 means no internet
9. Use typed interfaces — TypeScript support

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