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localstorage html forms

Posted on 2014-02-16
Last Modified: 2014-02-17
the following code allows me to save the form offline and retrieve it successfully,
but i might have more than one form to save .. what can i do in this case ... thx

here the html code and js

<!DOCTYPE html>
<html manifest="offline.manifest">
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Offline test page</title>
<link rel="stylesheet" type="text/css" media="all" href="styles.css" />

<p id="status">Online</p>

<form id="mainform" action="index.html" method="post">
<legend>Update data</legend>

<label>Roxy item 1: <input type="text" id="data1" name="data1" value="" /></label>
<label>Foxy item 2: <input type="text" id="data2" name="data2" value="" /></label>
<label>Galops item 3: <input type="text" id="data3" name="data3" value="" /></label>

<button type="submit">Save Data</button>


<script type="text/javascript" src="jquery-1.4.min.js"></script>
<script type="text/javascript" src="offline.js"></script>



jQuery(document).ready(function($) {
	if (window.localStorage) {
		$(window).bind('online offline', lib.Net.ChangeStatus);
var lib = lib || {};
lib.Net = function() {
	var online = true;
	function Online() { return navigator.onLine; }
	function ChangeStatus() {
		if (online != Online()) {
			online = Online();
			var s = $("#status");
			s.text(online ? "Online" : "Offline");
			if (online) s.removeClass("offline");
			else s.addClass("offline");
	return {
		Online: Online,
		ChangeStatus: ChangeStatus

lib.Save = function(e) {
	if (lib.Net.Online() || !window.localStorage) {
	alert("Data has been saved online.!)");
	else {
		$("#mainform input").each(function(i) {
		window.localStorage.setItem(this.id, this.value);
		alert("Data has been saved offline.");

lib.Load = function() {
	if (lib.Net.Online() || !window.localStorage) {
		alert("Currently online:\ndata could be loaded from server.");
	else {
		$("#mainform input").each(function(i) {
			this.value = window.localStorage.getItem(this.id);
		alert("Data has been loaded from offline store.");

Open in new window

Question by:mokaid83
  • 4
  • 4
LVL 75

Expert Comment

by:Michel Plungjan
ID: 39864192
How about

localStorage["form1"] = $("#form1").serialize();
localStorage["form2"] = $("#form2").serialize();

Author Comment

ID: 39864267
the case is that the user might fill more than time the same form and you are suggesting i have to create multiple instances of the same form , am i mistaken ?
LVL 75

Expert Comment

by:Michel Plungjan
ID: 39864309
Yes you are mistaken

localStorage["form1"] = $("#form1").serialize();

saves all information from form 1 on the format key1=value1&key2=value2

localStorage["form2"] = $("#form2").serialize();

saves all information from form 2
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Author Comment

ID: 39864464
my friend . you are telling me about form1 and form2 while i have only one form which is "mainform" ...
each user could save the same form more than one time in offline mode

would you please show me the code for this purpose
LVL 75

Expert Comment

by:Michel Plungjan
ID: 39864626
Sorry, you were not being clear.

You said I might have more than one form to save -I of course assume you meant you as the creator of the website.

You need to elaborate on how a user may have more than one form to save.

If it is the same form, each save should overwrite the previous form, no?

Author Comment

ID: 39864651
yes exactly .. that is what is happening right now
and i want to avoid the overwriting
i guess you got me now
LVL 75

Accepted Solution

Michel Plungjan earned 500 total points
ID: 39864674
Not quite. What event makes it important to store a new form?
That they leave and come back?, then you can do

var now = new Date().getTime()

localStorage["form"+now] = $("#form1").serialize();

var list = localStorage["listOfSaves"];
if (list) localStorage["listOfSaves"]=list.split("|").push(now).join("|");
else localStorage["listOfSaves"]=[now];

Open in new window

now you can use the listOfSaves to get the saved forms

Author Comment

ID: 39864740
thats what i have been to explain all the day ..
you got me now ..

Thanks a lot friend

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