网站进度存储？

Question

I'm pretty new to web development and have for most of you trivial question.Where and how to store website progress user did? I mean...for example.We have javascript variable

var a=0;

and

<div id="clickhere" onClick="a=a+1;document.getElementById('clickhere').innerHTML=a">

.Imagine someone clicked on that division once and leaves website.I want him to see displayed number one in that div after returning to website.

Answer 1

You either need a server side to store this data, identify the client by some uid or login and retrive the data on repeated visit. or a simpler solution, use a client side cookie.

Answer 2

If you only want visit data viewable to each individual user, you can use a local storage mechanism. For clients whose browsers support HTML 5 you can use localstorage to store a retrieve the variable between user visits. You could get he JavaScript to set a cookie and then check if a cookie exists per user visit, if it does, increment the visit count.

A more robust solution would be to persist the visit count server side. You can issue a cookie to a user, on each future visit, you can either send the visit data to the server via Ajax, or by form submit. This would then need to be persisted to a database using a server side language such as php, ruby or .net.