I have a static generated unsorted list and need to modify the parent li for a given child-href-match. This action should perform by rendering, not by interaction. I am using jQuery 1.12.4.
<div id="archive_widget" class="widget-odd widget-last widget-first widget-1 widget Archive_Widget">
<h3>Archive</h3>
<ul>
<li>2018</li>
<li>2017</li>
<li>2016</li>
<li>2015</li>
<li>2014</li>
<li>2013</li>
<li>2012</li>
<li>2010</li>
<li>2009</li>
</ul>
</div>
I don't know how to do this with JS, but this imaginary JS was in my mind.
jQuery(document).ready(function() {
var current = "<?php echo $current; ?>";
var ArchiveList = document.querySelector('#archive_widget ul li').children;
for (i = 0; i < productList.length; i++) {
if (productList[i].text == current) {
$(productList[i]).parent().addClass('active-menu');
}
}
});
Thank you.
There are some problems with your code:
document.querySelector select only one element, in your case the first LI
variable productList is never declared
The parent of a LI is always a list, not the LI itself.
Here is a working version of it:
$(document).ready(function() {
var current = "2014";
var productList = $('#archive_widget ul li a'); // select all A elements
for (i = 0; i < productList.length; i++) {
if ($(productList[i]).text() === current) {
$(productList[i]).parent().addClass('active-menu'); // Parent of A will be LI
}
}
});
Ideally, this would be set when SSR, but here's a scant attempt:
$(document).ready(function () {
let current = "2015";//set server-side
let found = false;
$("#archive_widget").children('ul').children("li").children("a").each(function () {
if (!found && $(this).text() === current) {
$(this).parent().addClass('active-menu');
found = true;
}
});
});
.active-menu { background: red }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="archive_widget" class="widget-odd widget-last widget-first widget-1 widget Archive_Widget">
<h3>Archive</h3>
<ul>
<li>2018</li>
<li>2017</li>
<li>2016</li>
<li>2015</li>
<li>2014</li>
<li>2013</li>
<li>2012</li>
<li>2010</li>
<li>2009</li>
</ul>
</div>
I hope this helps!
Change ArchiveList to productList since that's what your code is using and use .textContent instead of .text.
Your query selector only matches one element. You want to match all of the anchor elements whose parents are a li, so use document.querySelectorAll instead:
document.querySelectorAll('#archive_widget ul li a');
Fixed Code:
jQuery(document).ready(function() {
var current = "<?php echo $current; ?>";
var productList = document.querySelectorAll('#archive_widget ul li a');
for (i = 0; i < productList.length; i++) {
if (productList[i].textContent == current) {
$(productList[i]).parent().addClass('active-menu');
}
}
});
I've made this list of GoT charachters that could possible die (there's no spoilers or what so ever). The problem I'm having is that I'm supposed to remove a class but I can't make it work. I could just remove the CSS, I know but that's not what I'm trying to achieve here. I can't find the way to delete a CSS class during a JS event/function.
I can make it work by deleting the "li" tags so that part I've completed.
My HTML:
<ul class="carousel">
<!-- <li><img src="images/cersei-lannister-1920.jpg" alt="Cersei Lannister" title="Cersei Lannister"/></li>
<li><img src="images/daenarys-1920.jpg" alt="Daenarys" title="Daenarys"/></li>
<li><img src="images/maetser-varys-1920.jpg" alt="Maester Varys" title="Maester Varys"/></li>-->
</ul>
MY JS:
function changeImageIndex(value){
let charachter =["images/cersei-lannister-1920.jpg","images/daenarys-targaryen-1920.jpg", "images/maester-varys-1920.jpg", "images/margarey-tyrell-1920.jpg", "images/petyr-baelish-1920.jpg", "images/samwell-tarly-1920.jpg", "images/sansa-stark-1920.jpg"];
let str = "<li><img src='";
if(value === "1")
{
parseInt(i += 1);
if( i > 6)
{
i = 0
}
str += charachter[i];
console.log(str);
}
else{
parseInt(i -= 1);
if( i < 0)
{
i = 6;
}
str += charachter[i];
console.log(str);
}
str += "'></img></li>";
console.log(str);
let HTML = document.getElementsByClassName("carousel")[0];
console.log(document.querySelector("ul li").classList.remove("carousel"));
document.querySelector("li").classList.remove("carousel");
HTML.innerHTML = str;
}
MY CSS that I want gone:
.carousel li {
display: none;
}
I hope you guys can help me out here! Thanks!
Make a seperate class take ".hidecarousel" for display:none and add it to your CSS. Use the class name in your li tags. And then make use of the javascript to simply remove it.
var list = document.getElementsByClassName("hidecarousel");
while (list.length)
list[0].classList.remove("hidecarousel");
Here is how you can change the CSS of all the li inside your carousel ul to block.
var array_of_li = document.querySelectorAll("ul.carousel li");
var i;
for (i = 0; i < array_of_li.length; ++i) {
array_of_li[i].style.display = "block";
}
.carousel li {
display: none;
}
<ul class="carousel">
<li>First</li>
<li>Second</li>
<li>Third</li>
</ul>
From what I understand you are not using jQuery so here is the Javascript solution for removing a class from an element.
ELEMENT.classList.remove("CLASS_NAME");
Maybe if you add a class by js and in CSS you do what you want
.carousel li.active{display:inline-block;}
Hope you can make it :)
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 the div structure
<div id="navigate">
<div class="menu">
<div class="group">Mail</div>
<div class="item">Folders</div>
<div class="item">Messages</div>
</div>
<div class="menu">
<div class="group">Contacts</div>
<div class="item">Friends</div>
<div class="item">Work</div>
</div>
<div class="menu">
<div class="group">Setting</div>
<div class="item">General</div>
<div class="item">Account</div>
</div>
</div>
Right now all items are hidden, and only divs with class 'group' is shown. What I would like to do is if I mouse over a specific menu div, only items of that menu would appear.
Right now I have this code:
function initialise()
{
hideAllItems();
setMouseOvers();
}
function hideAllItems()
{
var nav = document.getElementById("navigate");
var items = nav.getElementsByClassName("item");
for(var i = 0; i < items.length; i++)
{
items[i].style.visibility = "hidden";
items[i].style.display = "none";
}
}
function setMouseOvers()
{
var nav = document.getElementById("navigate");
var menuArr = nav.getElementsByClassName("menu");
for(var x = 0; x < menuArr.length; x++)
{
var itemArrs = menuArr[x].getElementsByClassName("item");
/*var show = function(){ show(itemArrs); };
var hide = function(){ hide(itemArrs); };*/
menuArr[x].onmouseover=function(){ show(itemArrs); };
menuArr[x].onmouseout=function(){ hide(itemArrs); };
}
}
function show(itemArr)
{
for(var i = 0; i < itemArr.length; i++)
{
alert(itemArr[i].innerHTML);
itemArr[i].style.visibility = "visible";
itemArr[i].style.display = "block";
}
}
function hide(itemArr)
{
for(var i = 0; i < itemArr.length; i++)
{
itemArr[i].style.visibility = "hidden";
itemArr[i].style.display = "none";
}
}
And this works, thought it only displays General and Account no matter which menu I hover over. I vaguely understand whats going wrong, but I can't see anyway to fix it. Any ideas? I do not want to change the html structure (e.g. add ids, or create specific classes) if i can help it!
I know that you most probably are looking for a javascript solution, but you could use a simple CSS solution:
.group:hover ~ .item {
display: block;
}
Working Fiddle
But be aware that it is not supported by older IE (< 8) browsers SUPPORT. It depends on your target group if you want to use it.
Why not simply using CSS: DEMO
.menu .item{
display:none;
}
.menu:hover .item{
display:block;
}
As you ask for an JavaScript Only solution (no change in HTML/css) i suggest the following:
The problem is using "itemArrs" in an anonymous function, as only the latest written "itemArrs" is used for all of them, use "this" instead.
for example:
...
groups[x].onmouseover=function(){ show(this); };
...
and
function show(item) {
var items = item.parentNode.getElementsByClassName("item");
...
A complete JS-only solution that works can be found here:
http://jsfiddle.net/Wn4d4/3/
I'd like to use Javascript (not jquery) to access all items in a <ul> list and remove the active class from everything except my chosen menu item.
Here is the list:
<ul id='flash-menu'>
<li id="menu1" class='something active'>item 1</li>
<li id="menu2" class='somethingelse'>item 2</li>
<li id="menu3" class='somethingelse'>item 3</li>
</ul>
This is my javascript:
function updateMenu(view_name) {
var list_items = document.getElementById('flash-menu').childNodes;
for (var i=0 ; i<list_items.length ; i++){
list_items[i].className = list_items[i].className.replace('/\bactive\b/','');
}
document.getElementById(view_name).className += " active";
}
The last line of the Javascript (adding the active class) works, but I don't think I'm accessing the list items right to remove the classes from the other items. Any suggestions? - thanks!
First off, your regex is wrong:
list_items[i].className.replace(/\bactive\b/, '');
Note: No quotes on regex'es in JavaScript. A slighty altered, working version is available on JsFiddle.
Furthermore, I get a few instances of HTMLTextElements in list_items. They're breaking the loop (Fx3.6/Win7) when trying to access the non-existing className attribute. You can avoid this by either using:
var list_items = document.getElementById('flash-menu').getElementsByTagName('li');
// Selecting _all_ descendant <li> elements
or by checking for the existence of .className before read/write within the loop body (example). The latter is probably the cleanest choice since it still only affects direct children (you may have several levels of <ul>s in each <li>).
I.e.,
function updateMenu(view_name) {
var list_items = document.getElementById('flash-menu').childNodes;
for (var i=0, j=list_items.length; i<j; i++){
var elm = list_items[i];
if (elm.className) {
elm.className = elm.className.replace(/\bactive\b/, '');
}
}
document.getElementById(view_name).className += ' active';
}
You can use javascript function getElementsByTagName:
var listitems = document.getElementsByTagName("li");
this would return an array of all the lists and can be iterated for each list element and processed as required.
You can try:
In the case that you can have more than ul, first you have to get all references to them and then process each ul:
var uls = document.getElementsByTagName("ul");
for (uli=0;uli<uls.length;uli++) {
ul = uls[uli];
if (ul.nodeName == "UL" && ul.className == "classname") {
processUL(ul);
}
}
An illustration of proccessUL can be:
function processUL(ul) {
if (!ul.childNodes || ul.childNodes.length == 0) return;
// Iterate LIs
for (var itemi=0;itemi<ul.childNodes.length;itemi++) {
var item = ul.childNodes[itemi];
if (item.nodeName == "LI") {
// Iterate things in this LI
in the case that you need it put your code here
.....
}
}
}
Of course you can also use: item.className = "classname"; if you dont need to iterate between childs of LI
document.getElementById('flash-menu').childNodes will also include white space nodes.
function updateMenu(view_name) {
var list_items = document.getElementById('flash-menu').getElementsByTagName('li'), i;
for (i=0 ; i<list_items.length ; i++){
if (list_items[i].className.indexOf('active') > -1) {
list_items[i].className = list_items[i].className.replace(/\bactive\b/,'');
}
}
document.getElementById(view_name).className += " active";
}
i agree with jensgram,and you'd better code like this:
list_items[i].className.replace(/\bactive\b/g, '');
add the regex string a 'g'
g is for Global ，using ‘/g’ can replace all the same Which Match the regex ,but if you don't use '/g',you just replace the first string .
like this :
var test= "testeetest" ;
alert(test.replace(/e/,"")) ;//result
: tsteetest but using 'g' var
test= "testeetest" ;
alert(test.replace(/e/g,"")) ;//result
: tsttst
Have a look at this here: https://developer.mozilla.org/en-US/docs/Web/API/element.classList
It helped me a lot with finding class elements!
This is my solution, maybe not the best, but for my works fine.
window.addEventListener('load', iniciaEventos, false);
function iniciaEventos(e)
{
var menu = document.querySelectorAll('nav li');
for(var i = 0; i < menu.length; i++ )
{
menu[i].addEventListener('mousedown', clickMenu);
}
}
function clickMenu()
{
var menu = document.querySelectorAll('nav li');
for(var i = 0; i < menu.length; i++)
menu[i].classList.remove('active');
this.classList.add('active');
}