Yogi: Created page with "// /* Save form contents in a cookie, and read them from there again. Author: User:Lupo, January 2008 License: Quadruple licensed GFDL,..."

2016-11-21T18:45:48Z

Created page with "// <source lang="javascript"> /* Save form contents in a cookie, and read them from there again. Author: User:Lupo, January 2008 License: Quadruple licensed GFDL,..."

New page

// <source lang="javascript">
/*
Save form contents in a cookie, and read them from there again.

Author: [[User:Lupo]], January 2008
License: Quadruple licensed GFDL, GPL, LGPL and Creative Commons Attribution 3.0 (CC-BY-3.0)

Choose whichever license of these you like best :-)
*/

var FormRestorer =
{
getCookie : function (cookie_name)
{
if ( document.cookie == null || document.cookie.length == 0
|| cookie_name == null || cookie_name.length == 0)
return "";
var start = document.cookie.indexOf (cookie_name + '=');
if (start < 0) return "";
start = start + cookie_name.length + 1;
var end = document.cookie.indexOf (';', start);
if (end < 0)
return document.cookie.substring (start);
else
return document.cookie.substring (start, end);
},

saveForm : function (cookie_name, form_id, additional_data, cookie_attributes)
{
var form = document.getElementById (form_id);
if (form == null || form.elements == null || form.elements.length == 0) return;
var cookie_val = null;
var form_val = form_id;
if (additional_data) {
form_val = form_val + '/=' + additional_data;
cookie_val = "";
}
for (var i = 0; i < form.elements.length; i++) {
var element = form.elements[i];
if (element.nodeName.toLowerCase () == 'form') continue; // Don't do nested forms.
var element_value = null;
var single_select = false;
switch (element.type) {
case 'checkbox':
case 'radio':
element_value = (element.checked ? 'T' : 'F');
break;
case 'select-one':
single_select = true;
// Fall-through
case 'select-multiple':
for (var j = 0; j < element.length; j++) {
if (element[j].selected) {
if (element_value == null) {
element_value = "" + j;
if (single_select) break;
} else
element_value = element_value + '/' + j;
}
}
break;
case 'text':
// case 'file': // Is read-only anyway, we cannot set it (security policies)
case 'password':
case 'textarea':
element_value = element.value;
if (element_value == null) element_value = "";
break;
default:
// We don't do 'hidden' inputs. We also don't do buttons yet. Would we need to?
break;
} // end switch
if (element_value != null) {
var this_item = element.id;
if (this_item == null || this_item.length == 0) this_item = element.name;
this_item = this_item + '/' + element.type + '=' + element_value;
if (cookie_val == null || cookie_val.length == 0)
cookie_val = this_item;
else
cookie_val = cookie_val + '\f' + this_item;
}
} // end for
if (cookie_val != null) {
document.cookie = cookie_name + '=' + encodeURIComponent (form_val + '\f' + cookie_val)
+ (cookie_attributes != null ? cookie_attributes : "");
}
},

readForm : function (cookie_name)
{
try {
var cookie = FormRestorer.getCookie (cookie_name);
if (cookie.length < 3) return null;
var pairs = decodeURIComponent (cookie).split ('\f');
if (pairs.length < 2) return null;
var values = new Array (pairs.length);
// First one is the form id
for (var i = 0; i < pairs.length; i++) {
var j = pairs[i].indexOf ('=');
var k = pairs[i].lastIndexOf ('/', j);
if (j < 0 || k < 0) {
values[i] = null; continue;
}
var element_name = pairs[i].substring (0, k);
var element_type = pairs[i].substring (k+1, j);
var val = pairs[i].substring (j+1);
var value = null;
switch (element_type) {
case 'checkbox':
case 'radio':
value = (val == 'T');
break;
case 'select-one':
value = new Number (val);
break;
case 'select-multiple':
{
var numbers = val.split ('/');
value = new Array (numbers.length);
for (var j = 0; j < numbers.length; j++)
value[j] = new Number (numbers[j]);
}
break;
default:
value = val;
break;
} // end switch
values[i] = {id : element_name, type : element_type, val : value};
} // end for
return values;
} catch (some_error) {
return null;
}
}

} // end FormRestorer

MediaWiki:FormRestorer.js - Revision history

Yogi: Created page with "// /* Save form contents in a cookie, and read them from there again. Author: User:Lupo, January 2008 License: Quadruple licensed GFDL,..."