永久收藏夹列表

Question

I need to keep track of a list of 25 favourites which are added from a list of ~100 entries. These favourites would be in a list of say

• "favourite 1"
• "favourite 2"
• "favourite 3" .... so on

and I need them to be stored persistently. I also would require them to be able to be deleted and replaced with another favourite string value. I have looked at How do I store an array in localStorage? but that doesn't work for me because when I declare var names=[]; on the javascript file, every time my favourites function runs it redeclares the array and clears everything.

I have tried doing something like:

function addToFav(string)
{
    if (localStorage.fav1)  // if fav1 was created before
    {
        alert("local storage fav1 present, don't make variables");
    }
    else
    {
        alert('fav variables never made, make them now');
        var i=1;
        for (i=1; i<=25; i++)
        {
            var favNumber = "fav" + i;
            localStorage.favNumber = "x";
        }
        alert(localStorage.fav1);                   // outputs "undefined"
    }
}

it was my intention to make localStorage variables of fav1 , fav2 , fav3 ... fav25 and then manage them individually. But this doesn't work since calling localStorage.favNumber = "x"; makes the local storage variable favNumber equal to "x" and not fav+i .

I'm out of ideas at the moment; I have looked at http://playground.html5rocks.com/#async_transactions to try using a HTML5 database but I'm very new to web development and it seems a bit too much for what I'm trying to do. Does anyone know how to fix this issue? Any information would be helpful.

Answer 1

This might help. I use these to store info in Local Storage with cookie backup...

function setLocalStorage(c_name, value) {
    var exdays = 30;
    // if localStorage is present, use that
    if (('localStorage' in window) && window.localStorage !== null) {
        localStorage[c_name] = value;
    } else {
        var exdate = new Date();
        exdate.setDate(exdate.getDate() + exdays);
        var c_value = escape(value) + ((exdays == null) ? "" : "; expires=" +     exdate.toUTCString());
        document.cookie = c_name + "=" + c_value;
    }
}

function getLocalStorage(c_name) {
    // if localStorage is present, use that
    if (('localStorage' in window) && window.localStorage !== null) {
        return localStorage[c_name];
    } else {
        var i, x, y, ARRcookies = document.cookie.split(";");
        for (i = 0; i < ARRcookies.length; i++) {
            x = ARRcookies[i].substr(0, ARRcookies[i].indexOf("="));
            y = ARRcookies[i].substr(ARRcookies[i].indexOf("=") + 1);
            x = x.replace(/^\s+|\s+$/g, "");
            if (x == c_name) {
                return unescape(y);
            }
        }
    }
}