I\'m starter. I have an idea. I want to implement an event like this. Is it possible?
First visit event
You have a couple of options: storing a cookie on the client or utilizing the local storage of html5. Either of these could be checked on page load.
Here is a link for getting started with HTML5 web storage:
http://www.w3schools.com/html/html5_webstorage.asp
Since working with localStorage can be tedious because of operators and function names, to simplify you can use the in operator to check if a key exists:
window.onload = function () {
if(!('hasThisRunBefore' in localStorage)) {
/** Your code here... **/
localStorage.setItem("hasThisRunBefore", true);
}
}
Localstorage is probably the way to go. Here is a bit of info on it: http://diveintohtml5.info/storage.html
Basically it allows you to store small amounts of data on the user's machine (up to 5mb in most browsers). So all you need to do is set a flag in there letting you know that the user has already visited, and if that flag isn't present on page load, show the message.
// Run function on load, could also run on dom ready
window.onload = function() {
// Check if localStorage is available (IE8+) and make sure that the visited flag is not already set.
if(typeof window.localStorage !== "undefined" && !localStorage.getItem('visited')) {
// Set visited flag in local storage
localStorage.setItem('visited', true);
// Alert the user
alert("Hello my friend. This is your first visit.");
}
}
This should work in all browsers where local storage is available. See caniuse.com for reference. http://caniuse.com/#search=localstorage
you can do it for chrome in following way
<html>
<head>
<title>First visit event</title>
<script>
function do_something() {
if(typeof(localStorage.setVisit)=='undefind' || localStorage.setVisit==''){
localStorage.setVisit='yes';
alert("Hello my friend. This is your first visit.");
}
}
</script>
</head>
<body onload="do_something()"> </body>
Use on load. It will execute when the page loads, and you will see your alert. Good luck with your knowledge.
<html>
<head>
<script>
function load()
{
alert("Page is loaded");
}
</script>
</head>
<body onload="load()">
<h1>Hello World!</h1>
</body>
</html>
Edit: You can get more advance and set cookies to see if it's the user's first time, but I'm not sure you're at that level yet, but anyways:
You could for example set a localStorage property like
if(!localStorage["alertdisplayed"]) {
alert("Your text")
localStorage["alertdisplayed"] = true
}
Note that localStorage isn't supported by older Browsers.
An alternative would be setting a Cookie and check against its existence
If you don't know how to set / get cookies with javascript, i would suggest, reading this article: https://developer.mozilla.org/en-US/docs/Web/API/document.cookie?redirectlocale=en-US&redirectslug=DOM%2Fdocument.cookie