The ListView component triggers events based on its actions. The events can be used as extension points to perform custom operations. Refer to the following steps to trace the ListView events:
actionBegin
,
actionComplete
,
and select
events.actionBegin
,actionComplete
, and select events.actionBegin
and actionComplete
events, and they will be displayed in the event trace panel
when the ListView action starts and the dataSource bound successfully.SelectEventArgs
in the
select event, and display the selected list item text in the event trace panel while selecting list items.import * as React from 'react';
import * as ReactDOM from "react-dom";
import { ListViewComponent } from '@syncfusion/ej2-react-lists';
import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
function App() {
//Define an array of JSON data
let data = [
{ text: "Hennessey Venom", id: "list-01" },
{ text: "Bugatti Chiron", id: "list-02" },
{ text: "Bugatti Veyron Super Sport", id: "list-03" },
{ text: "SSC Ultimate Aero", id: "list-04" },
{ text: "Koenigsegg CCR", id: "list-05" },
{ text: "McLaren F1", id: "list-06" },
{ text: "Aston Martin One- 77", id: "list-07" },
{ text: "Jaguar XJ220", id: "list-08" },
{ text: "McLaren P1", id: "list-09" },
{ text: "Ferrari LaFerrari", id: "list-10" }
];
const [state, SetState] = React.useState({
eventData: [],
});
function btnClick() {
SetState({
eventData: []
});
}
//Handler for actionBegin event trace
function onActionBegin() {
setTimeout(() => {
SetState({
eventData: [...state.eventData, "actionBegin"]
});
}, 0);
}
//Handler for select event trace
function onSelect(args) {
SetState({
eventData: [...state.eventData, `${args.text} is selected`]
});
}
//Handler for actionComplete event trace
function onActionComplete() {
setTimeout(() => {
SetState({
eventData: [...state.eventData, "actionComplete"]
});
}, 0);
}
//Display event log
function appendElement(html) {
let span = document.createElement("span");
span.innerHTML = html;
let log = document.getElementById("EventLog");
log.insertBefore(span, log.firstChild);
}
return (<div id="sample">
<div className="content-wrapper">
<ListViewComponent id="listview-def" dataSource={data} width="250" select={onSelect.bind(this)} actionBegin={onActionBegin.bind(this)} actionComplete={onActionComplete.bind(this)}/>
</div>
<div id="list_event">
<h4>
<b>Event Trace</b>
</h4>
<div id="evt">
<div className="eventarea">
<span className="EventLog" id="EventLog">
<div />
{state.eventData.map((data, index) => (<div key={index}>{data}</div>))}
</span>
</div>
<div className="evtbtn">
<ButtonComponent id="clear" onClick={btnClick.bind(this)}>
Clear
</ButtonComponent>
</div>
</div>
</div>
</div>);
}
export default App;
ReactDOM.render(<App />, document.getElementById('element'));
<!DOCTYPE html>
<html lang="en">
<head>
<title>Syncfusion React ListView</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Essential JS 2 for React Components" />
<meta name="author" content="Syncfusion" />
<link href="//cdn.syncfusion.com/ej2/20.4.38/ej2-base/styles/material.css" rel="stylesheet" />
<link href="//cdn.syncfusion.com/ej2/20.4.38/ej2-react-lists/styles/material.css" rel="stylesheet" />
<link href="//cdn.syncfusion.com/ej2/20.4.38/ej2-react-buttons/styles/material.css" rel="stylesheet" />
<link href="index.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
<script src="systemjs.config.js"></script>
<style>
#loader {
color: #008cff;
height: 40px;
left: 45%;
position: absolute;
top: 45%;
width: 30%;
}
</style>
</head>
<body>
<div id='element' style="max-width:400px;">
<div id='loader'>Loading....</div>
</div>
</body>
</html>
.content-wrapper {
padding-left: 40px;
padding-top: 36px;
}
#EventLog b {
color: #388e3c;
}
#EventLog {
word-break: normal
}
#listview-def {
border: 1px solid #dcdcdc;
}
.evtbtn {
margin-top: 40px;
margin-left: 70px;
}
/* csslint ignore:start */
hr {
margin-top: 6px !important;
margin-bottom: 6px !important;
}
/* csslint ignore:end */
#evt {
border: 1px solid #dcdcdc;
padding: 10px;
min-width: 10px;
}
#sample {
display: inline-flex;
}
.eventarea {
min-width: 250px;
height:273px;overflow: auto
}
#list_event {
margin-top: -25px;
padding-left:40px;
min-width: 200px;
}
#container {
visibility: hidden;
}
#loader {
color: #008cff;
height: 40px;
left: 45%;
position: absolute;
top: 45%;
width: 30%;
}
import * as React from 'react';
import * as ReactDOM from "react-dom";
import { ListViewComponent } from '@syncfusion/ej2-react-lists';
import { ButtonComponent } from '@syncfusion/ej2-react-buttons';
function App() {
//Define an array of JSON data
let data: any[] = [
{ text: "Hennessey Venom", id: "list-01" },
{ text: "Bugatti Chiron", id: "list-02" },
{ text: "Bugatti Veyron Super Sport", id: "list-03" },
{ text: "SSC Ultimate Aero", id: "list-04" },
{ text: "Koenigsegg CCR", id: "list-05" },
{ text: "McLaren F1", id: "list-06" },
{ text: "Aston Martin One- 77", id: "list-07" },
{ text: "Jaguar XJ220", id: "list-08" },
{ text: "McLaren P1", id: "list-09" },
{ text: "Ferrari LaFerrari", id: "list-10" }
];
const [state, SetState] = React.useState({
eventData: [],
});
function btnClick() {
SetState({
eventData: []
});
}
//Handler for actionBegin event trace
function onActionBegin(): void {
setTimeout(() => {
SetState({
eventData: [...state.eventData, "actionBegin"]
});
}, 0);
}
//Handler for select event trace
function onSelect(args: SelectEventArgs): void {
SetState({
eventData: [...state.eventData, `${args.text} is selected`]
});
}
//Handler for actionComplete event trace
function onActionComplete(): void {
setTimeout(() => {
SetState({
eventData: [...state.eventData, "actionComplete"]
});
}, 0);
}
//Display event log
function appendElement(html: string): void {
let span: HTMLElement = document.createElement("span");
span.innerHTML = html;
let log: any = document.getElementById("EventLog");
log.insertBefore(span, log.firstChild);
}
return (
<div id="sample">
<div className="content-wrapper">
<ListViewComponent
id="listview-def"
dataSource={data}
width="250"
select={onSelect.bind(this) as any}
actionBegin={onActionBegin.bind(this) as any}
actionComplete={onActionComplete.bind(this) as any}
/>
</div>
<div id="list_event">
<h4>
<b>Event Trace</b>
</h4>
<div id="evt">
<div className="eventarea">
{/*Event log element */}
<span className="EventLog" id="EventLog">
<div />
{state.eventData.map((data: string, index: number) => (
<div key={index}>{data}</div>
))}
</span>
</div>
<div className="evtbtn">
{/*clear button element */}
<ButtonComponent id="clear" onClick={btnClick.bind(this)}>
Clear
</ButtonComponent>
</div>
</div>
</div>
</div>
);
}
export default App;
ReactDOM.render(<App />, document.getElementById('element'));