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I have a set of three list items that I would like to automatically display from high to low on page load. Ideally using jquery or javascript.
<ul class="list">
<li id="alpha">32</li>
<li id="beta">170</li>
<li id="delta">28</li>
</ul>
Each list item needs its own ID because they each have individual background images. The numbers must text nodes so that a user can edit them.
This will probably be the fastest way to do it, since it doesn't use jQuery:
function sortList(ul){
var new_ul = ul.cloneNode(false);
// Add all lis to an array
var lis = [];
for(var i = ul.childNodes.length; i--;){
if(ul.childNodes[i].nodeName === 'LI')
lis.push(ul.childNodes[i]);
}
// Sort the lis in descending order
lis.sort(function(a, b){
return parseInt(b.childNodes[0].data , 10) -
parseInt(a.childNodes[0].data , 10);
});
// Add them into the ul in order
for(var i = 0; i < lis.length; i++)
new_ul.appendChild(lis[i]);
ul.parentNode.replaceChild(new_ul, ul);
}
Call the function like:
sortList(document.getElementsByClassName('list')[0]);
You can sort other lists the same way, and if you have other elements on the same page with the list class you should give your ul an id and pass it in using that instead.
Example JSFiddle
Edit
Since you mentioned that you want it to happen on pageLoad, I'm assuming you want it to happen ASAP after the ul is in the DOM which means you should add the function sortList to the head of your page and use it immediately after your list like this:
<head>
...
<script type="text/javascript">
function sortList(ul){
var new_ul = ul.cloneNode(false);
var lis = [];
for(var i = ul.childNodes.length; i--;){
if(ul.childNodes[i].nodeName === 'LI')
lis.push(ul.childNodes[i]);
}
lis.sort(function(a, b){
return parseInt(b.childNodes[0].data , 10) - parseInt(a.childNodes[0].data , 10);
});
for(var i = 0; i < lis.length; i++)
new_ul.appendChild(lis[i]);
ul.parentNode.replaceChild(new_ul, ul);
}
</script>
</head>
<body>
...
<ul class="list">
<li id="alpha">32</li>
<li id="beta">170</li>
<li id="delta">28</li>
</ul>
<script type="text/javascript">
!function(){
var uls = document.getElementsByTagName('ul');
sortList( uls[uls.length - 1] );
}();
</script>
...
</body>
You can try this
var ul = $(".list:first");
var arr = $.makeArray(ul.children("li"));
arr.sort(function(a, b) {
var textA = +$(a).text();
var textB = +$(b).text();
if (textA < textB) return -1;
if (textA > textB) return 1;
return 0;
});
ul.empty();
$.each(arr, function() {
ul.append(this);
});
Live example : http://jsfiddle.net/B7hdx/1
you can use this lightweight jquery plugin List.js cause
it's lightweight [only 3K script]
easy to implement in your existing HTML table using class
searchable, sortable and filterable
HTML
<div id="my-list">
<ul class="list">
<li>
<h3 class="name">Luke</h3>
</li>
<li>
<h3 class="name">John</h3>
</li>
</ul>
</div>
Javascript
var options = {
valueNames: ['name']
};
var myList = new List('my-list', options);
There's also this small jQuery plugin. Which would make your sort nothing more than:
$('.list>li').tsort({attr:'id'});
This code will sort that list assuming there is only one .list item:
function sortList(selector) {
var parent$ = $(selector);
parent$.find("li").detach().sort(function(a, b) {
return(Number(a.innerHTML) - Number(b.innerHTML));
}).each(function(index, el) {
parent$.append(el);
});
}
sortList(".list");
You can see it work here: http://jsfiddle.net/jfriend00/FjuMB/
To explain how it works:
It gets the .list parent object.
It finds all the <li> child objects.
It removes all the <li> child objects from the DOM, but preserves their data
It sorts the li objects using a custom sort function
The custom sort function gets the HTML in the li tag and converts it to a number
Then, traversing the array in the newly sorted order, each li tag is appended back onto the original parent.
The result is that they are displayed in sorted order.
Edit:
This improved version will even sort multiple list objects at once:
function sortList(selector) {
$(selector).find("li").sort(function(a, b) {
return(Number(a.innerHTML) - Number(b.innerHTML));
}).each(function(index, el) {
$(el).parent().append(el);
});
}
sortList(".list");
Demo: http://jsfiddle.net/jfriend00/RsLwX/
Non jquery version (vanilla javascript)
Benefits: the list is sorted in place, which doesn't destroy the LI's nor remove any events that may be associated with them. It just shuffles things around
Added an id to the UL:
<ul id="myList" class="list">
<li id="alpha">32</li>
<li id="beta">170</li>
<li id="delta">28</li>
</ul>
and the vanilla javascript (no jquery)
// Grab a reference to the UL
var container = document.getElementById("myList");
// Gather all the LI's from the container
var contents = container.querySelectorAll("li");
// The querySelector doesn't return a traditional array
// that we can sort, so we'll need to convert the contents
// to a normal array.
var list = [];
for(var i=0; i<contents.length; i++){
list.push(contents[i]);
}
// Sort based on innerHTML (sorts "in place")
list.sort(function(a, b){
var aa = parseInt(a.innerHTML);
var bb = parseInt(b.innerHTML);
return aa < bb ? -1 : (aa > bb ? 1 : 0);
});
// We'll reverse the array because our shuffle runs backwards
list.reverse();
// Shuffle the order based on the order of our list array.
for(var i=0; i<list.length; i++){
console.log(list[i].innerHTML);
container.insertBefore(list[i], container.firstChild);
}
And the fiddle proof: https://jsfiddle.net/L27gpnh6/1/
You can use this method:
var mylist = $('ul');
var listitems = mylist.children('li').get();
listitems.sort(function(a, b) {
var compA = $(a).text().toUpperCase();
var compB = $(b).text().toUpperCase();
return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
})
$.each(listitems, function(idx, itm) { mylist.append(itm); });
Check the article here:
http://www.onemoretake.com/2009/02/25/sorting-elements-with-jquery/
Edit: There is a very cool jquery plugin that does that : http://tinysort.sjeiti.com/
Something like this should help:
var $parent = $(".list");
$(".list li").sort(function (a, b) {
return window.parseInt($(a).text(), 10) - window.parseInt($(b).text(), 10);
}).remove().each(function () {
$parent.append($(this));
});
One method could be to sort an array (well, a jQuery object) of the li elements and replace the contents (using the html method) of the ul with the sorted array of elements:
$(".list").html($(".list li").sort(function(a, b) {
return parseInt($(b).text(), 10) - parseInt($(a).text(), 10);
}));
Here's a working example.
using jQuery for help:
var sortFunction = function(a, b) {
return (+($(b).text())) - (+($(a).text()));
}
var lis = $('ul.list li');
lis = Array.prototype.sort.call(lis, sortFunction);
for (var i = 0; i < lis.length; i++) {
$('ul.list').append(lis[i]);
}
Fiddle Link
Sort jQuery collection as usual array and then append each element back in correct order.
$(".list li").sort(function(a, b) {
return parseInt($(b).text(), 10) - parseInt($(a).text(), 10);
}).appendTo('.list');
http://jsfiddle.net/zMmWj/
Is it possible to lock list items in JQuery sortable list in a way that those items will stay in that particular place in the list.
For example,
consider this pseudo list with locked items...
item A
item B(locked)
item C(locked)
item D
item E
item F
item G(locked)
So, I'd like to have the items B,C and G to be fixed in a way that if user drag and drop item D at the start of the list, the item A "jumps" over fixed/locked items B and C with following results...
item D
item B(locked)
item C(locked)
item A
item E
item F
item G(locked)
I've been searching for something like this without luck. Is it possible..?
Here's a hopefully bug-free version, updating as you drag. It's generating the current desired positions of the items when sorting starts, which means you should be able to change the classes whenever you need, refresh the widget's list items and you're good to go.
It also uses the sortable's built-in items property to prevent dragging the fixed items and to sort out any sorting problems at the top and the bottom of the list.
I tried to move the fixed items around, but that resulted in horribly buggy behaviour, especially when there are multiple fixed items in groups. The final solution detaches all fixed items from the list, adds a helper element to the front, then re-inserts the fixed elements to their desired position, which seems to fix all bugs.
Try the demo here: http://jsfiddle.net/PQrqS/1/
HTML:
<ul id="sortable">
<li>oranges</li>
<li class="static">apples</li>
<li>bananas</li>
<li>pineapples</li>
<li>grapes</li>
<li class="static">pears</li>
<li>mango</li>
</ul>
CSS:
.static { color:red; }
li { background-color:whitesmoke; border:1px solid silver; width:100px; padding:2px; margin:2px; }
Javascript:
$('#sortable').sortable({
items: ':not(.static)',
start: function(){
$('.static', this).each(function(){
var $this = $(this);
$this.data('pos', $this.index());
});
},
change: function(){
$sortable = $(this);
$statics = $('.static', this).detach();
$helper = $('<li></li>').prependTo(this);
$statics.each(function(){
var $this = $(this);
var target = $this.data('pos');
$this.insertAfter($('li', $sortable).eq(target));
});
$helper.remove();
}
});
I extended the jQuery.Ui.sortable:
Overview
jQuery.Ui.sortable widget extension with fixed feature. This feature allows user to fix elements in the list.
With the .fixedsortable() constructor you construct a .sortable() class which extended with the features. You can use the original methods and the extended as well.
Code
https://gist.github.com/3758329#file_fixedsortable.js > fixedsortable.js
Example
http://jsfiddle.net/omnosis/jQkdb/
Usage
General:
To use, add the fixed property to the sortable list optios:
$("#list").fixedsortable({
fixed: (value)
})
the value can be:
integer example: 3
array of integers example : [1,2,5]
a html element or a list of html elements
a css selector
jquery object
HTML:
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script> //the jquery
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js"></script> //the original jquery-ui
<script type="text/javascript" src="https://raw.github.com/gist/3758329/91749ff63cbc5056264389588a8ab64238484d74/fixedsortable.js"></script> //the extended sortable
...
<ul id="sortable1">
<li>oranges</li>
<li class="static">apples</li>
<li>bananas</li>
<li>pineapples</li>
<li>grapes</li>
<li class="static">pears</li>
<li>mango</li>
</ul>
<ul id="sortable2">
<li>bananas</li>
<li foo="asd">oranges</li>
<li foo="dsa">apples</li>
<li>pineapples</li>
<li>grapes</li>
<li>pears</li>
<li>mango</li>
</ul>
<ul id="sortable3">
<li>bananas</li>
<li>oranges</li>
<li>apples</li>
<li>pineapples</li>
<li>grapes</li>
<li>pears</li>
<li>mango</li>
</ul>
Javascript
$(function() {
$("#sortable1").fixedsortable({
fixed: "> .static"
});
$("#sortable2").fixedsortable({
fixed: $("li[foo]").css("background","red")
});
$("#sortable3").fixedsortable({
fixed: 2
})
});
Notes:
If you insist to use the .sortable instead of .fixedsortable you can use this https://gist.github.com/3758329#file_sortable.js instead of the jquery.ui library. This is a complete replacement of the jQuery.ui, but i don't recommend to use this because of later updates.
i have been working on this more than 12 hours :( i am insane..
Check this out: Forcing an item to remain in place in a jQuery UI Sortable list
Also, I've implemented the above solution with multiple fixed elements here: http://jsfiddle.net/enBnH/12/ (obsolete, see below)
It's rather self-explanatory, i think.
EDIT:
I've automated the process for generating the lockto values as well as adding ID's to those lis with the class "fixed" (note that i have to add an ID so we can reference it)
See the COMPLETE solution HERE: http://jsfiddle.net/enBnH/44/
EDIT
Okay, after a gazillion errors with the above, i just rewrote the dang thing myself:
http://jsfiddle.net/thomas4g/GPMZZ/15/
NOTE: The above does work, but #DarthJDG's answer seems a lot nicer to me. I'm leaving mine up on the offchance someone might prefer how mine behaves (i've learned not to delete stuff just beceause there's a better version :P )
Using the items parameter you can achieve what you want like this:
$("#mytable tbody").sortable({items: 'tr.sortable'});
Only rows with a .sortable CSS class can be sorted now.
If you want to lock only the 1st row you can do this:
$("#mytable tbody").sortable({items: 'tr:not(:first)'});
The possibilities are endless...
This is based on #DarthJDG code. However it wasn't retrieving all the id's and the sorting wasn't working with the table. So I managed to update his solution which works with both list and tables and keeps the id in the array.
Javascript:
var fixed = '.static'; //class which will be locked
var items = 'li'; //tags that will be sorted
$('ul').sortable({
cancel: fixed,
items: items,
start: function () {
$(fixed, this).each(function () {
var $this = $(this);
$this.data('pos', $this.index());
});
},
change: function () {
var $sortable = $(this);
var $statics = $(fixed, this).detach();
var tagName = $statics.prop('tagName');
var $helper = $('<'+tagName+'/>').prependTo(this);
$statics.each(function () {
var $this = $(this);
var target = $this.data('pos');
$this.insertAfter($(items, $sortable).eq(target));
});
$helper.remove();
}
});
Demo: http://plnkr.co/edit/hMeIiRFT97e9FGk7hmbs
Connected sortables and fixed items
I ran into the problem when we have several connected sortables. The code suggested by #sarunast and #DarthJDG has erroneous behavior when dragging items from one list to another.
Therefore, I have modified it a little, and now you can drag items from different lists with saving positions in both of them.
javascript:
let connected = '.soratble';
let fixed = '.static';
let newParentContainer;
//wrap the code suggested by #sarunast and #DarthJDG into the function
//code was modified a little
function sortingAroundFixedPositions(container) {
let sortable = $(container);
let statics = $(fixed, container).detach();
let tagName = statics.prop('tagName');
let helper = $('<' + tagName + '/>').prependTo(container);
statics.each(function() {
let target = this.dataset.pos;
let targetPosition = $(tagName, sortable).eq(target);
if (targetPosition.length === 0) {
targetPosition = $(tagName, sortable).eq(target - 1)
}
$(this).insertAfter(targetPosition);
});
helper.remove();
}
$('ul').sortable({
connectWith: connected,
cancel: fixed,
start: function() {
$(fixed, connected).each(function() {
this.dataset.pos = $(this).index();
});
},
change: function(e, ui) {
sortingAroundFixedPositions(this);
if (ui.sender) {
newParentContainer = this;
}
if (newParentContainer) {
sortingAroundFixedPositions(newParentContainer);
}
},
update: function(e, ui) {
newParentContainer = undefined;
}
});
demo: http://plnkr.co/edit/blmv4ZjaWJFcjvO2zQH0
Just use the "Include/Exclude" items selectors.
Here is the link: https://jqueryui.com/sortable/#items
oh no! gist link is broken. here is code dump from https://gist.github.com/peterh-capella/4234752
code accessed Jan 6, 2016
//this code is created to fix this problem: http://stackoverflow.com/questions/4299241/
(function( $, undefined ) {
$.widget("ui.fixedsortable", $.ui.sortable, {
options: $.extend({},$.ui.sortable.prototype.options,{fixed:[]}),
_create: function() {
var o = this.options;
this.containerCache = {};
this.element.addClass("ui-sortable");
//Get the items
$.ui.sortable.prototype.refresh.apply(this,arguments);
if( typeof this.options.fixed == "number") {
var num = this.options.fixed
this.options.fixed = [num];
}
else if( typeof this.options.fixed == "string" || typeof this.options.fixed == "object") {
if(this.options.fixed.constructor != Array) {
var selec = this.options.fixed;
var temparr = [];
var temp = $(this.element[0]).find(selec);
var x = this;
temp.each(function() {
var i;
for(i=0;i<x.items.length && x.items[i].item.get(0) != this;++i) {}
if(i<x.items.length) temparr.push(i);
});
this.options.fixed = temparr;
}
}
//Let's determine if the items are being displayed horizontally
this.floating = this.items.length ? o.axis === 'x' || (/left|right/).test(this.items[0].item.css('float')) || (/inline|table-cell/).test(this.items[0].item.css('display')) : false;
//Let's determine the parent's offset
this.offset = this.element.offset();
//Initialize mouse events for interaction
$.ui.sortable.prototype._mouseInit.apply(this,arguments);
},
_mouseCapture: function( event ) {
this._fixPrev = this._returnItems();
return $.ui.sortable.prototype._mouseCapture.apply(this,arguments);
},
_mouseStart: function( event ) {
for(var i=0;i<this.options.fixed.length;++i) {
var num = this.options.fixed[i];
var elem = this.items[num];
if(event.target == elem.item.get(0)) return false;
}
return $.ui.sortable.prototype._mouseStart.apply(this,arguments);
},
_rearrange: function(event, i, a, hardRefresh) {
a ? a[0].appendChild(this.placeholder[0]) :
i.item[0].parentNode.insertBefore(this.placeholder[0], (this.direction == 'down' ? i.item[0] : i.item[0].nextSibling));
this._refix(i);
//Various things done here to improve the performance:
// 1. we create a setTimeout, that calls refreshPositions
// 2. on the instance, we have a counter variable, that get's higher after every append
// 3. on the local scope, we copy the counter variable, and check in the timeout, if it's still the same
// 4. this lets only the last addition to the timeout stack through
this.counter = this.counter ? ++this.counter : 1;
var self = this, counter = this.counter;
window.setTimeout(function() {
if(counter == self.counter) self.refreshPositions(!hardRefresh); //Precompute after each DOM insertion, NOT on mousemove
},0);
},
_refix: function(a) {
var prev = this._fixPrev;
var curr = this._returnItems();
var Fixcodes = this.options.fixed;
var NoFixed = [];
var Fixed = [];
var Mixed = []
var post = [];
for(var i=0;i<Fixcodes.length;++i) {
var fix_index = Fixcodes[i];
var fix_item = prev[fix_index];
var j = 0;
for(j=0;j<curr.length && curr[j].item.get(0) != fix_item.item.get(0);++j) {}
curr.splice(j,1);
Fixed.push(fix_item);
}
for(var i=0;i<curr.length;++i) {
if(curr[i].item.get(0) != this.currentItem.get(0)) {
NoFixed.push(curr[i]);
}
}
var fix_count = 0;
var nofix_count = 0;
for(var i=0;i<Fixed.length + NoFixed.length;++i) {
if(Fixcodes.indexOf(i) >= 0) {
Mixed.push(Fixed[fix_count++]);
}
else {
Mixed.push(NoFixed[nofix_count++]);
}
}
var parent = this.currentItem.get(0).parentNode;
var allchild = parent.children;
for(var i=0;i<Mixed.length;++i) {
parent.removeChild(Mixed[i].item.get(0));
parent.appendChild(Mixed[i].item.get(0));
}
},
_returnItems: function(event) {
this.containers = [this];
var items = [];
var self = this;
var queries = [[$.isFunction(this.options.items) ? this.options.items.call(this.element[0], event, { item: this.currentItem }) : $(this.options.items, this.element), this]];
var connectWith = $.ui.sortable.prototype._connectWith.apply;
if(connectWith) {
for (var i = connectWith.length - 1; i >= 0; i--){
var cur = $(connectWith[i]);
for (var j = cur.length - 1; j >= 0; j--){
var inst = $.data(cur[j], 'sortable');
if(inst && inst != this && !inst.options.disabled) {
queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element[0], event, { item: this.currentItem }) : $(inst.options.items, inst.element), inst]);
this.containers.push(inst);
}
};
};
}
for (var i = queries.length - 1; i >= 0; i--) {
var targetData = queries[i][1];
var _queries = queries[i][0];
for (var j=0, queriesLength = _queries.length; j < queriesLength; j++) {
var item = $(_queries[j]);
item.data('sortable-item', targetData); // Data for target checking (mouse manager)
items.push({
item: item,
instance: targetData,
width: 0, height: 0,
left: 0, top: 0
});
};
};
return items;
},
value: function(input) {
//console.log("test");
$.ui.sortable.prototype.value.apply(this,arguments);
}
});
})(jQuery);
And dumping rest of his answer, just in case
dependencies
https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js
https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js
Script
function randomColor() { //for a little fun ;)
var r = (Math.floor(Math.random()*256));
var g = (Math.floor(Math.random()*256));
var b = (Math.floor(Math.random()*256));
return "#" + r.toString(16) + g.toString(16) + b.toString(16)
}
$(function() {
$("#sortable1").fixedsortable({
fixed: "> .static", //you can use css selector
sort: function() { //you can add events as well, without getting confused. for example:
$(".static").css("background",randomColor()) //change the fixed items background
},
change: function(event,ui) {
$(ui.item[0]).css("border","2px solid "+randomColor()) //change the captured border color
},
stop: function(event,ui) {
$(ui.item[0]).css("border","2px solid #777"); //change the back the css modifications
$("#sortable1 > li.static").css("background","#aaa");
}
});
$("#sortable2").fixedsortable({ //you can use jQuery object as selector
fixed: $("li[foo]").css("background","red")
});
$("#sortable3").fixedsortable({
fixed: [2,4], //you can use array of zero base indexes as selector
update: function(event, ui) {
alert($(this).fixedsortable('toArray')) //the fixedsortable('toArray') also works
}
})
$("#sortable4").fixedsortable({
fixed: 5 //you can fix a single item with a simple integer
})
});
HTML
<body>
<div style="width:120px;float:left;">
<ul id="sortable1">
<li>oranges</li>
<li class="static">apples</li>
<li>bananas</li>
<li>pineapples</li>
<li>grapes</li>
<li class="static">pears</li>
<li>mango</li>
</ul>
<ul id="sortable2">
<li>bananas</li>
<li foo="asd">oranges</li>
<li foo="dsa">apples</li>
<li>pineapples</li>
<li>grapes</li>
<li>pears</li>
<li>mango</li>
</ul>
</div>
<div style="width:120px;float:left;">
<ul id="sortable3">
<li id="fru_1">bananas</li>
<li id="fru_2">oranges</li>
<li id="fru_3" style="background:#f4f">apples</li>
<li id="fru_4">pineapples</li>
<li id="fru_5" style="background:#faaba9">grapes</li>
<li id="fru_6">pears</li>
<li id="fru_7">mango</li>
</ul>
<ul id="sortable4">
<li>bananas</li>
<li>oranges</li>
<li>apples</li>
<li>pineapples</li>
<li>grapes</li>
<li style="background:#dada00">pears</li>
<li>mango</li>
</ul>
</div>
</body>
CSS
ul {margin:10px;}
ul#sortable1 > li, ul#sortable2 > li, ul#sortable3 > li, ul#sortable4 > li {
display:block;
width:100px;
height:15px;
padding: 3px;
background: #aaa;
border: 2px solid #777;
margin: 1px;
}
ul#sortable1 > li.static {
opacity:0.5;
}
Maybe this will help to someone: use methods "disable" and "enable". Example
HTML:
<ul class="sortable">
<li>You can move me</li>
<li data-state="lifeless">You can't move me.</li>
</ul>
Script:
$('#sortable').sortable();
$('#sortable').mousedown(function() {
if($(this).data('state')=='lifeless') $('#sortable').sortable('disable');
else $('#sortable').sortable('enable');
});
Live example here: https://jsfiddle.net/ozsvar/0ggqtva5/2/
There is a slightly better way to solve this.
You need to use a grid instead of a list and then you can fix the position of an element by declaring where the element should be arranged with css:
.fixed-element {
grid-column-start: 1;
grid-column-end: 1;
grid-row-start: 1;
grid-row-end: 1;
}
I have a input box and below it, a basic list. When you press arrow-down (or arrow-up) from within the input box, I'd like to highlight/change-background of the first list item (as if it was being selected).
<div><input id="frmartist" type="text" value=""/></div>
<ul id="artistlist">
<li id="artist-1">artist 1</li>
<li id="artist-2">artist 2</li>
<li id="artist-3">artist 3</li>
<li id="artist-4">artist 4</li>
<li id="artist-5">artist 5</li>
</ul>
If you press arrow-down again, the 2nd item would be highlighted. If you press down again, the 3rd item would be highlighted.
And if you were to press arrow-up, then the 2nd item would be highlighted again.
How can I control this behavior with jquery/javascript? I'm guessing I should track which item is highlighted, but outside of that, I think I'm clueless.
I'm catching the arrow-up and arrow-down by using e.which === 40 and e.which === 38, but I'm confused as to where to go accessing the first item of the list.
Any tips?
Track the state of the highlighted artist in a variable. Then attach an event to the window which monitors the keyup event and looks for 38 or 40. Update the state of the highlighted artist, and then update the view to reflect the change based on the key event.
Like this, demo: http://jsfiddle.net/9bFAb/
html:
<div><input id="frmartist" type="text" value=""/></div>
<ul id="artistlist">
<li id="artist-1" class="highlighted">artist 1</li>
<li id="artist-2">artist 2</li>
<li id="artist-3">artist 3</li>
<li id="artist-4">artist 4</li>
<li id="artist-5">artist 5</li>
</ul>
css:
.highlighted{
background-color:red;
}
js:
var artistIndex = 1;
function hightlightArtist(index){
var selector = "#artist-" + index;
$('.highlighted').removeClass('highlighted');
$(selector).addClass('highlighted');
}
window.onkeyup = function(e){
var code = e.which;
if( code == 40 ){
if( artistIndex < 5 )artistIndex++;
}//up
if( code == 38){
if( artistIndex > 1 ) artistIndex--;
}//down
hightlightArtist(artistIndex);
};
Here is a solution that doesn't use any global JavaScript state. This makes it simpler than solutions that do use such state, as here we inspect the markup to find its current state. This solution is thus more robust in some ways (no data redundancy, cannot have out of sync state).
As you were saying, you must track the currently selected element. But if you do your highlighting using a dedicated CSS class, then the CSS class itself can serve as the marker indicating which element is currently highlighted.
The below functions for moving up and down, respectively, should do the trick. Just call the right one from each keypress handler. The currently highlighted list item is assumed to have CSS class highlighted. I used a helper function called moveBy to achieve maximum code reuse.
EDITED: rewrote the example using jQuery's index to achieve more straightforward support for page up, down, etc.
var moveUp = function(list) { moveBy(-1, list); };
var moveDown = function(list) { moveBy(+1, list); };
var pageUp = function(list) { moveBy(-10, list); };
var pageDown = function(list) { moveBy(+10, list); };
var first = function(list) { moveBy(-$(list).children().length, list); };
var last = function(list) { moveBy(+$(list).children().length, list); };
var moveBy = function(delta, list) {
list = $(list);
var count = list.children().length;
var current = list.children('.highlighted');
if (!current.length) {
// There are no highlighted items.
// Highlight the first or the last, depending on whether
// delta is up (negative), or down (positive).
list.get(delta > 0 ? 0 : count - 1).addClass('highlighted');
} else {
// Find the next element according to delta. Do not wrap around.
var nextIndex = current.index() + delta;
nextIndex = Math.max(0, Math.min(count - 1, nextIndex));
var next = list.get(nextIndex);
// Switch highlighting.
current.removeClass('highlighted');
next.addClass('highlighted');
}
};
Starting point for you. Up and Down arrows both work. If you press key to try to get past the end or past the beginning of the list it will wrap around correctly which you might like too. I hope it helps you.
JSFIDDLE: http://jsfiddle.net/YnpW3/2/
CODE:
HTML:
<div><input id="frmartist" type="text" value=""/></div>
<ul id="artistlist">
<li id="artist-1">artist 1</li>
<li id="artist-2">artist 2</li>
<li id="artist-3">artist 3</li>
<li id="artist-4">artist 4</li>
<li id="artist-5">artist 5</li>
</ul>
JS:
var h = 0;
function lich()
{
$("li").css({color: "black"});
$("li").eq(h).css({color: "Red"});
}
lich();
$(window).on("keyup", function(e){
if(e.keyCode == 40)
{
h++;
if(h > $("li").length - 1)
{
h= 0;
}
lich();
}
else if(e.keyCode ==38)
{
h--;
if(h < 0)
{
h= $("li").length - 1;
}
lich();
}
})
jsBin demo
this will also loop, and it doesn't care how much artists you have ;)
var $artists = $('#artistlist li'),
nOfArtists = $artists.length,
curr = 0;
$artists.eq( curr ).addClass('highlight');
$(window).on('keyup', function( e ){
var key = e.which;
if(key == 40){
curr++ ;
curr = curr % nOfArtists ;
}else if(key==38){
curr-- ;
if(curr === -1){
curr = nOfArtists-1;
}
}
$artists.eq(curr).addClass('highlight').siblings().removeClass('highlight');
});
I have a set of three list items that I would like to automatically display from high to low on page load. Ideally using jquery or javascript.
<ul class="list">
<li id="alpha">32</li>
<li id="beta">170</li>
<li id="delta">28</li>
</ul>
Each list item needs its own ID because they each have individual background images. The numbers must text nodes so that a user can edit them.
This will probably be the fastest way to do it, since it doesn't use jQuery:
function sortList(ul){
var new_ul = ul.cloneNode(false);
// Add all lis to an array
var lis = [];
for(var i = ul.childNodes.length; i--;){
if(ul.childNodes[i].nodeName === 'LI')
lis.push(ul.childNodes[i]);
}
// Sort the lis in descending order
lis.sort(function(a, b){
return parseInt(b.childNodes[0].data , 10) -
parseInt(a.childNodes[0].data , 10);
});
// Add them into the ul in order
for(var i = 0; i < lis.length; i++)
new_ul.appendChild(lis[i]);
ul.parentNode.replaceChild(new_ul, ul);
}
Call the function like:
sortList(document.getElementsByClassName('list')[0]);
You can sort other lists the same way, and if you have other elements on the same page with the list class you should give your ul an id and pass it in using that instead.
Example JSFiddle
Edit
Since you mentioned that you want it to happen on pageLoad, I'm assuming you want it to happen ASAP after the ul is in the DOM which means you should add the function sortList to the head of your page and use it immediately after your list like this:
<head>
...
<script type="text/javascript">
function sortList(ul){
var new_ul = ul.cloneNode(false);
var lis = [];
for(var i = ul.childNodes.length; i--;){
if(ul.childNodes[i].nodeName === 'LI')
lis.push(ul.childNodes[i]);
}
lis.sort(function(a, b){
return parseInt(b.childNodes[0].data , 10) - parseInt(a.childNodes[0].data , 10);
});
for(var i = 0; i < lis.length; i++)
new_ul.appendChild(lis[i]);
ul.parentNode.replaceChild(new_ul, ul);
}
</script>
</head>
<body>
...
<ul class="list">
<li id="alpha">32</li>
<li id="beta">170</li>
<li id="delta">28</li>
</ul>
<script type="text/javascript">
!function(){
var uls = document.getElementsByTagName('ul');
sortList( uls[uls.length - 1] );
}();
</script>
...
</body>
You can try this
var ul = $(".list:first");
var arr = $.makeArray(ul.children("li"));
arr.sort(function(a, b) {
var textA = +$(a).text();
var textB = +$(b).text();
if (textA < textB) return -1;
if (textA > textB) return 1;
return 0;
});
ul.empty();
$.each(arr, function() {
ul.append(this);
});
Live example : http://jsfiddle.net/B7hdx/1
you can use this lightweight jquery plugin List.js cause
it's lightweight [only 3K script]
easy to implement in your existing HTML table using class
searchable, sortable and filterable
HTML
<div id="my-list">
<ul class="list">
<li>
<h3 class="name">Luke</h3>
</li>
<li>
<h3 class="name">John</h3>
</li>
</ul>
</div>
Javascript
var options = {
valueNames: ['name']
};
var myList = new List('my-list', options);
There's also this small jQuery plugin. Which would make your sort nothing more than:
$('.list>li').tsort({attr:'id'});
This code will sort that list assuming there is only one .list item:
function sortList(selector) {
var parent$ = $(selector);
parent$.find("li").detach().sort(function(a, b) {
return(Number(a.innerHTML) - Number(b.innerHTML));
}).each(function(index, el) {
parent$.append(el);
});
}
sortList(".list");
You can see it work here: http://jsfiddle.net/jfriend00/FjuMB/
To explain how it works:
It gets the .list parent object.
It finds all the <li> child objects.
It removes all the <li> child objects from the DOM, but preserves their data
It sorts the li objects using a custom sort function
The custom sort function gets the HTML in the li tag and converts it to a number
Then, traversing the array in the newly sorted order, each li tag is appended back onto the original parent.
The result is that they are displayed in sorted order.
Edit:
This improved version will even sort multiple list objects at once:
function sortList(selector) {
$(selector).find("li").sort(function(a, b) {
return(Number(a.innerHTML) - Number(b.innerHTML));
}).each(function(index, el) {
$(el).parent().append(el);
});
}
sortList(".list");
Demo: http://jsfiddle.net/jfriend00/RsLwX/
Non jquery version (vanilla javascript)
Benefits: the list is sorted in place, which doesn't destroy the LI's nor remove any events that may be associated with them. It just shuffles things around
Added an id to the UL:
<ul id="myList" class="list">
<li id="alpha">32</li>
<li id="beta">170</li>
<li id="delta">28</li>
</ul>
and the vanilla javascript (no jquery)
// Grab a reference to the UL
var container = document.getElementById("myList");
// Gather all the LI's from the container
var contents = container.querySelectorAll("li");
// The querySelector doesn't return a traditional array
// that we can sort, so we'll need to convert the contents
// to a normal array.
var list = [];
for(var i=0; i<contents.length; i++){
list.push(contents[i]);
}
// Sort based on innerHTML (sorts "in place")
list.sort(function(a, b){
var aa = parseInt(a.innerHTML);
var bb = parseInt(b.innerHTML);
return aa < bb ? -1 : (aa > bb ? 1 : 0);
});
// We'll reverse the array because our shuffle runs backwards
list.reverse();
// Shuffle the order based on the order of our list array.
for(var i=0; i<list.length; i++){
console.log(list[i].innerHTML);
container.insertBefore(list[i], container.firstChild);
}
And the fiddle proof: https://jsfiddle.net/L27gpnh6/1/
You can use this method:
var mylist = $('ul');
var listitems = mylist.children('li').get();
listitems.sort(function(a, b) {
var compA = $(a).text().toUpperCase();
var compB = $(b).text().toUpperCase();
return (compA < compB) ? -1 : (compA > compB) ? 1 : 0;
})
$.each(listitems, function(idx, itm) { mylist.append(itm); });
Check the article here:
http://www.onemoretake.com/2009/02/25/sorting-elements-with-jquery/
Edit: There is a very cool jquery plugin that does that : http://tinysort.sjeiti.com/
Something like this should help:
var $parent = $(".list");
$(".list li").sort(function (a, b) {
return window.parseInt($(a).text(), 10) - window.parseInt($(b).text(), 10);
}).remove().each(function () {
$parent.append($(this));
});
One method could be to sort an array (well, a jQuery object) of the li elements and replace the contents (using the html method) of the ul with the sorted array of elements:
$(".list").html($(".list li").sort(function(a, b) {
return parseInt($(b).text(), 10) - parseInt($(a).text(), 10);
}));
Here's a working example.
using jQuery for help:
var sortFunction = function(a, b) {
return (+($(b).text())) - (+($(a).text()));
}
var lis = $('ul.list li');
lis = Array.prototype.sort.call(lis, sortFunction);
for (var i = 0; i < lis.length; i++) {
$('ul.list').append(lis[i]);
}
Fiddle Link
Sort jQuery collection as usual array and then append each element back in correct order.
$(".list li").sort(function(a, b) {
return parseInt($(b).text(), 10) - parseInt($(a).text(), 10);
}).appendTo('.list');
http://jsfiddle.net/zMmWj/
Ok so I have columns I want added together if there is any information in them. So say I have
Accounts
1
2
3
.
There are 4 account spaces but only 3 accounts.
How do I create java script to add this up.
Live Example
HTML:
<ul>
<li id="accounts">
<p> Accounts </p>
<ul>
<li> 1 </li>
<li> 2 </li>
<li> 3 </li>
<li> . </li>
</ul>
</li>
</ul>
JavaScript:
// Get accounts, ul and set sum to 0
var acc = document.getElementById("accounts"),
ul = acc.getElementsByTagName("ul")[0],
sum = 0;
// Filter out text nodes. Returning an array of <LI> elements
var lis = Array.prototype.filter.call(ul.childNodes, function(li) {
if (li.tagName === "LI") {
return true;
}
});
// Loop through LIs adding up the sum
for (var i = 0, ii = lis.length; i < ii; i++) {
// If it's the last LI element then set the textContent.
if (i === ii - 1) {
lis[i].textContent = sum;
} else {
sum += +lis[i].textContent;
}
}
Disclaimer: Requires Modern Browser or Modernizr.
If your real markup is a list like that, you could do something like this:
// using jquery syntax for brevity; consider it pseudocode
var jList = $('#accounts');
function addColumns() {
var iSum = 0;
jList.find('li').each(function() {
var jLI = $(this);
if(parseFloat(jLI.text()) != 'NaN')
iSum += parseFloat(jLI.text());
});
return iSum;
}
This isn't super-great code. If you give us a little more info about what you're working with, something a little more robust should suggest itself. But the basic idea is that you check a set of elements-of-interest to see if they have summable content (i.e. if their text content can be interpreted as a number); then you add the summable items together.
The requirements of an algorithm like that will impose constraints on the way your "columns" can be marked-up. But there's a near-infinite set of possibilities.