can any one optimize this code i am new to jquery . i want add class on next and previous button click.any way i wrote this code it's working for me but if any one optimize this code using jquery predefined methods .then it will more helpful.. Thanks in advance
$(document).ready(function () {
var length = $('#slides li').size() - 1;
var curren = 0;
console.log(length);
$('.next').on('click', function () {
if (curren >= 0 && curren < length) {
curren++;
$('.selected').removeClass('selected');
$('#slides li:eq(' + curren + ')').addClass('selected');
}
});
$('.prev').on('click', function () {
if (curren >= 1) {
curren--;
$('.selected').removeClass('selected');
$('#slides li:eq(' + curren + ')').addClass('selected');
}
});
});
my html code
<ul id="slides">
<li class="selected">first</li>
<li>second</li>
<li>third</li>
<li>fourth</li>
<li>five</li>
<li>six</li>
</ul>
You should have a look at $.next and $.prev .
Your code can easily be altered into something along these lines:
$(".next").on("click", function() {
var selected = $("#slides li.selected");
var next = selected.next();
if(next.length){next.addClass("selected");selected.removeClass("selected");}
});
$(".prev").on("click", function() {
var selected = $("#slides li.selected");
var prev = selected.prev();
if(prev.length){prev.addClass("selected");selected.removeClass("selected");}
});
Example can be found here: jsbin
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