I am trying to execute a javascript alert, but only alert if it is the first time that browser / computer has viewed that page - or something similar to that.
How would this be done? I have written the Javascript to what I think it be similar to.
function alert() {
alert(" Please view this is Firefox");
}
if (first time viewing this page) {
alert();
}
I really appreciate your help
You could use the JQuery Cookie Plugin for this.
function showPopUp() {
var cookie = $.cookie('the_cookie');
if(!cookie){
alert(" Please view this in Firefox");
$.cookie('the_cookie', 'the_value');
}
}
showPopUp();
You can use localStorage
or cookies
:
Here is an example with localStorage
:
var visited = localStorage.getItem('visited');
if (!visited) {
alert("Please view this is Firefox");
localStorage.setItem('visited', true);
}
Don't use a Cookie
it will be sent to the server at each time your make request. You can use Local Storage
instead, like:
function load() {
var isFired = localStorage.getItem('checkFired');
if (isFired != '1'){
alert(" Please view this is Firefox");
localStorage.setItem('checkFired', '1');
}
}
load();
Set cookie
document.cookie="first=first";
Read a Cookie with JavaScript
var x = document.cookie;
Example:
function getCookie(cname)
{
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++)
{
var c = ca[i].trim();
if (c.indexOf(name)==0) return c.substring(name.length,c.length);
}
return "";
}
function checkCookie()
{
var first=getCookie("first");
if(first == "first")
{
alert(" Please view this is Firefox");
}else{
document.cookie="first=first";
}
}
看到此链接,您将获得一些基于cookie的想法示例 。一旦键入您的值,然后刷新它,它将显示该值。
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