如何根据CSS和JavaScript的类名称过滤DIV元素？
要根据类名称过滤DIV元素，代码如下-
示例
<!DOCTYPE html>
<html>
<style>
.filterElements {
float: left;
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
font-size: 20px;
background-color: rgb(28, 98, 179);
color: #ffffff;
width: 100px;
line-height: 100px;
text-align: center;
margin: 2px;
display: none;
}
.show {
display: block;
}
.container {
margin-top: 20px;
overflow: hidden;
}
.btn {
border: none;
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
font-size: 14px;
outline: none;
padding: 12px 16px;
background-color: #d6e5ec;
cursor: pointer;
}
.btn:hover {
background-color: rgb(157, 209, 211);
}
.btn.active {
background-color: rgb(34, 95, 228);
color: white;
}
</style>
<body>
<h1>Filter DIV Elements Example</h1>
<div class="filterBtns">
<button class="btn active" onclick="filterSelection('all')">Show all</button>
<button class="btn" onclick="filterSelection('animals')">Animals</button>
<button class="btn" onclick="filterSelection('fruits')">Fruits</button>
</div>
<div class="container">
<div class="filterElements fruits">Orange</div>
<div class="filterElements animals">Giraffe</div>
<div class="filterElements animals">Cheetah</div>
<div class="filterElements animals">Lion</div>
<div class="filterElements fruits">Guava</div>
<div class="filterElements animals">Dog</div>
<div class="filterElements fruits">Banana</div>
<div class="filterElements fruits">Mango</div>
<div class="filterElements animals">Bull</div>
</div>
<script>
filterSelection("all");
function filterSelection(c) {
var x, i;
x = document.querySelectorAll(".filterElements");
if (c == "all") c = "";
Array.from(x).forEach(item => {
removeActiveClass(item, "show");
if (item.className.indexOf(c) > -1) addActiveClass(item, "show");
});
}
function addActiveClass(ele, name) {
var i, arr1, arr2;
arr1 = ele.className.split(" ");
arr2 = name.split(" ");
for (i = 0; i < arr2.length; i++) {
if (arr1.indexOf(arr2[i]) == -1) {
ele.className += " " + arr2[i];
}
}
}
function removeActiveClass(ele, name) {
var i, arr1, arr2;
arr1 = ele.className.split(" ");
arr2 = name.split(" ");
for (i = 0; i < arr2.length; i++) {
while (arr1.indexOf(arr2[i]) > -1) {
arr1.splice(arr1.indexOf(arr2[i]), 1);
}
}
ele.className = arr1.join(" ");
}
var filterBtns = document.querySelector(".filterBtns");
var btns = filterBtns.getElementsByTagName("button");
for (var i = 0; i < btns.length; i++) {
btns[i].addEventListener("click", function() {
var current = document.getElementsByClassName("active");
current[0].className = current[0].className.replace(" active", "");
this.className += " active";
});
}
</script>
</body>
</html>输出结果
上面的代码将产生以下输出-
单击任何过滤器按钮时-