Provision to check if webviewer is idle for an hour


We are into a scenario where we need to check if user is inactive for an hour (i.e. WebViewer window/screen is idle). Is there any event or api available to check that, I couldn’t find in the documentation.
If there is any way, please do let me know.


Hey Rakesh,

Unfortunately, we don’t have an API to check user’s activities, but I believe this is something you can implement with pure JavaScript, for example:

).then(async (instance) => {
function activityWatcher(){

//The number of seconds that have passed since the user was active.
let secondsSinceLastActivity = 0;

//Max Inactivity time, for example: 3 seconds.
const maxInactivity = 3;

//An array of DOM events that should be interpreted as user activity.
const activityEvents = [
‘mousedown’, ‘mousemove’, ‘keydown’,
‘scroll’, ‘touchstart’

//Setup the setInterval method to run
//every second. 1000 milliseconds = 1 second.
console.log(secondsSinceLastActivity + ’ seconds since the user was last active’);
//if the user has been inactive or idle for longer
//then the seconds specified in maxInactivity
if(secondsSinceLastActivity > maxInactivity){
console.log(‘User has been inactive for more than ’ + maxInactivity + ’ seconds’);
}, 1000);

//The function that will be called whenever a user is active
function activity(){
//reset the secondsSinceLastActivity variable
//back to 0
secondsSinceLastActivity = 0;

activityEvents.forEach(function(eventName) {
//add these events to the webviewer iframe
const viewerWindow = document.getElementById(‘viewer’).querySelector(‘iframe’).contentWindow;
//register the activity function as the listener parameter.
viewerWindow.document.body.addEventListener(eventName, activity, true);



The code above is from, I modified it a little bit to make it works in WebViewer, but there are also many other posts/tutorials that you may find useful:

Best Regards,
Oscar Zhang
Software Developer
PDFTron Systems, Inc.

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