CollectionView Validation (Vue)

The CollectionView has a getError property that provides validation support. You can perform your own validation using a custom function when items are edited.

This sample uses the getError property function to only allow certain countries and positive numbers to be committed.

Learn about FlexGrid | Editing Views Documentation | CollectionView API Reference

This example uses Vue.

<template> <div class="container-fluid"> <h2>FlexGrid Validation</h2> <p> When you use the <b>CollectionView.getError</b> method for validation, the <b>FlexGrid</b> will show errors in data cells and also in the row header cells. </p> <p> By default, the row header cells will show all the errors in the item. To customize that behavior, return the error message you want to show for the row header when <b>getError</b> is called without a specific property (prop == null). </p> <p> Try entering an invalid country or a negative number to see how the grid identifies the error and prevents the invalid entry from being committed: </p> <wj-flex-grid :itemsSource="view"></wj-flex-grid> <h2>Forms Validation</h2> <p> You can use the the <b>CollectionView.getError</b> property to validate forms as well. Simply call the function and apply the result to the appropriate input element using the <b>setCustomValidity</b> method that is part of the HTML5 validation API: </p> <form id="theForm" class="form-inline" @input="validateForm($event.target)" @submit="$event.preventDefault()"> <div class="form-group"> <label for="country">Country</label> <input id="country" type="text" class="form-control" required value="US"> </div> <div class="form-group"> <label for="downloads">Downloads</label> <input id="downloads" type="number" class="form-control" required value="123"> </div> <div class="form-group"> <label for="sales">Sales</label> <input id="sales" type="number" class="form-control" required value="123"> </div> <button type="submit" class="btn btn-primary">Submit</button> </form> </div> </template> <script> import "bootstrap.css"; import "@mescius/wijmo.styles/wijmo.css"; import { createApp } from "vue" import { registerGrid } from "@mescius/wijmo.vue2.grid"; import * as wijmo from "@mescius/wijmo"; import { getData, countries } from "./data"; let App = { name: "app", data: function () { return { theItem: {}, view: new wijmo.CollectionView(getData(), { sortDescriptions: ["country"], getError: this.getError, }) }; }, methods: { validateForm: function (input) { let propName = input.id; // this.theItem[propName] = input.value; input.setCustomValidity(this.view.getError(this.theItem, propName)); }, getError(item, propName) { switch (propName) { case 'country': return countries.indexOf(item.country) < 0 ? 'Invalid Country' : ''; case 'downloads': case 'sales': case 'expenses': return item[propName] < 0 ? 'Negative values not allowed!' : ''; case 'active': return item.active && item.country.match(/^(US|Germany)$/) ? 'Active items not allowed in the US or Germany!' : ''; case null: let errors = []; for (let key in item) { let err = this.getError(item, key); if (err) errors.push(err); } return errors.length > 1 ? 'this item has ' + errors.length + ' errors' : (errors.length == 1 ? errors[0] : null); } return null; } } }; const app = createApp(App); // register all components and directives from Wijmo modules registerGrid(app); app.mount('#app'); </script> <style> .form-group { margin-right: 8px; } .form-group>label { margin-right: 3px; } .form-group input:invalid { border-color: red; box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(255, 0, 0, .6); } </style>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo CollectionView Validation</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.21.5/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app.vue'); </script> </head> <body> <div id="app"> </div> </body> </html>
export function getData() { let data = []; // for (let i = 0; i < countries.length; i++) { data.push({ country: countries[i], downloads: Math.round(Math.random() * 20000), sales: (countries[i] == 'Germany' ? -1 : 1) * Math.random() * 10000, expenses: (countries[i] == 'US' ? -1 : 1) * Math.random() * 5000, active: i % 4 == 0 }); } // return data; } export const countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece', 'Spain', 'Portugal', 'Australia'];
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