whenever browser detect it show the popup only once

Question

i want whenever i Login salesforce there will be a popup that you are using chrome browser but i want this will popup only once and i tried this code

 <apex:page >

    <div id="browserid">

        <script type="text/javascript">

        txt = navigator.userAgent;
        var counter =0 ;
        if (txt.indexOf("Chrome")!=-1)
        {

                text="Chrome"
                window.onload = function(){
                    if(counter == 0){
                        window.alert("Currently you are using  " +text+ "",width=300,height=200);
                    counter++;
                    }
                }
            }
        }
</script>
    </div>
</apex:page>

but i am getting again and again popup. Please help me how to solve this problem?

Answer 1

try session storage.

https://developer.mozilla.org/en/docs/Web/API/Window/sessionStorage

when someone logs in set the key

sessionStorage.setItem('Popupshown', 'true');

next time onwards check for this key

var popupshown = sessionStorage.getItem('Popupshown');

 if (sessionStorage.getItem("Popupshown") === null) {
sessionStorage.setItem('Popupshown', 'true');    
 txt = navigator.userAgent;
        var counter =0 ;
        if (txt.indexOf("Chrome")!=-1)
        {

                text="Chrome"
                window.onload = function(){
                    if(counter == 0){
                        window.alert("Currently you are using  " +text+ "",width=300,height=200);
                    counter++;
                    }
                }
            }
    }