How to Save and Get Values From Cookies Using JavaScript

In this article we will tell how to save and get cookies using JavaScript.

Procedure to save a value in cookies using JavaScript

In the following function we pass three parameters:

1. c_name: the name of the cookie (that you want to create)
2. value: the value you want to save in the cookie
3. expiredays: expiry days of your cookie

function setCookie(c_name, value, expiredays) {

    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" + value + ";path=/" + ((expiredays ==null) ? "" : ";expires=" + exdate.toGMTString());
}

Procedure to get the value from a cookie

In the following function we pass one parameter:

Name: name of the cookie that you want to get the value of.

function getCookie(name) {
    var dc = document.cookie;
    var prefix = name +"=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1) {
        begin = dc.indexOf(prefix);
        if (begin != 0)return null;
    } else {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1) {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

 Example

 This is the simple live example of how to use a cookie in your application:

<scriptlanguage="javascript"type="text/javascript">
            function setCookie(c_name, value, expiredays) {

               var exdate = new Date();
                exdate.setDate(exdate.getDate() + expiredays);
                document.cookie = c_name + "=" + value + ";path=/" + ((expiredays ==null) ? "" : ";expires=" + exdate.toGMTString());
            }
            function getCookie(name) {
                var dc = document.cookie;
                var prefix = name +"=";
                var begin = dc.indexOf("; " + prefix);
                if (begin == -1) {
                    begin = dc.indexOf(prefix);
                    if (begin != 0)return null;
                } else {
                    begin += 2;
                }
                var end = document.cookie.indexOf(";", begin);
                if (end == -1) {
                    end = dc.length;
                }
                return unescape(dc.substring(begin + prefix.length, end));
            }
            function savename() {
                setCookie("SetName", document.getElementById("textName").value, 1);

            }
            function getName() {
                var strVal = getCookie("SetName");
                var name = document.getElementById("textName").value;
                if (strVal == name) {

                    alert("hi i am " + name);

                }

            }
        </script>

<formid="form1"runat="server">
         <inputtype="text"id="textName"onblur="savename();"/>
         <inputtype="button"onclick="getName();"value="Click"/>

        </form>