针对多个 Classes 之一/仅 Class 字符串的一部分 - className 与 classList
Targeting one of multiple Classes / only part of the Class string - className vs classList
所以我正在尝试为我的摄影作品集网站组合一个 Javascript 开关。我的目标是能够单击标记为仅显示日落的按钮并隐藏每个没有 "Sunsets" Class 的图像。我在下面提出的代码几乎可以工作,但是有一个主要缺陷:
此代码仅保留图像的可见性,例如下面的“1.jpg”,其 Class 为 exactly/only "Sunsets"(或 "NSFW," 或其他) .但通常我需要给图像提供不止一个 class,例如区分垂直或属于多个类别的图像。所以我需要代码来保持任何图像的可见性,例如下面的“2.jpg”,其 Class.
中的任何位置都有 "Sunsets"(或其他)
JS:
<script>
function filterOn(imageClass) {
var image = document.getElementsByTagName('figure');
for (i = 0; i < image.length; i++) {
if (image[i].className != imageClass) {
image[i].style.display = 'none';
}
}
document.getElementById(imageClass + '-off').innerHTML = 'Undo Filter';
document.getElementById(imageClass + '-off').setAttribute('onClick', "filterOff('" + imageClass + "')");
document.getElementById(imageClass + '-off').id = imageClass + '-on';
}
function filterOff(imageClass) {
var image = document.getElementsByTagName('figure');
for (i = 0; i < image.length; i++) {
if (image[i].className != imageClass) {
image[i].style.display = 'inline-block';
}
}
document.getElementById(imageClass + '-on').innerHTML = 'Show Only ' + imageClass;
document.getElementById(imageClass + '-on').setAttribute('onClick', "filterOn('" + imageClass + "')");
document.getElementById(imageClass + '-on').id = imageClass + '-off';
}
</script>
HTML:
<ul>
<li id="Sunsets-off" onClick="filterOn('Sunsets')">Show Only Sunsets</li>
<li id="NSFW-off" onClick="filterOn('NSFW')">Show Only NSFW</li>
</ul>
<img class="Sunsets" src="1.jpg">
<img class="vertical Sunsets" src="2.jpg">
<img class="NSFW vertical" src="3.jpg">
<img class="Architectural" src="4.jpg">
<img class="Sunsets Landscapes" src="5.jpg">
<img class="Abstract" src="6.jpg">
<img class="NSFW LondonAndrews" src="7.jpg">
那个测试:
if (image[i].className != imageClass) {
确实会检查整个 class 字符串。
有 classList API 做你想做的,将你的测试替换为:
if (!image[i].classList.contains(imageClass)) {
我会通过为所有图像添加 class 名称来简化它,这样您就可以轻松定位所有图像,然后使用切换的 class 隐藏您不想看到的图像.这也使您能够使用 css3 动画淡出您不想看到的图像。
function filterOn( clazz ){
// get all the images using the additional img class
var images = slice(document.getElementsByClassName('img'));
// hide all the images
var ret = images.map(function( image ){
image.classList.add('hide');
return image;
})
// reduce the images to only contain those you want to show
.filter(function( image ){
return image.classList.contains( clazz );
})
// show the image by removing the hide class
.forEach(function( image ){
image.classList.remove('hide');
});
}
// show all images
function showAll(){
var images = slice(document.getElementsByClassName('img'));
images.forEach(function( image ){
image.classList.remove('hide');
});
}
// helper function to get an array from an array like object
function slice( arrayLike ){
return Array.prototype.slice.call( arrayLike );
}
.img {
display: block;
float: left;
margin-left: .8em;
border: .3em solid #aaa;
}
.hide {
display: none;
}
.filters {
display: block;
width: 100%;
float: left;
}
.Sunsets {
border: .3em solid orange;
}
.NSFW {
border: .3em solid magenta;
}
<nav class="filters">
<button id="Sunsets-off" onClick="filterOn('Sunsets')">Show Only Sunsets</button>
<button id="NSFW-off" onClick="filterOn('NSFW')">Show Only NSFW</button>
<button id="show-all" onClick="showAll()">Show All</button>
</nav>
<!-- I added an img class to the images for ease of use later -->
<section class="images">
<img class="img Sunsets" src="http://placehold.it/50/50">
<img class="img vertical Sunsets" src="http://placehold.it/50/50">
<img class="img NSFW vertical" src="http://placehold.it/50/50">
<img class="img Architectural" src="http://placehold.it/50/50">
<img class="img Sunsets Landscapes" src="http://placehold.it/50/50">
<img class="img Abstract" src="http://placehold.it/50/50">
<img class="img NSFW LondonAndrews" src="http://placehold.it/50/50">
</section>
所以我正在尝试为我的摄影作品集网站组合一个 Javascript 开关。我的目标是能够单击标记为仅显示日落的按钮并隐藏每个没有 "Sunsets" Class 的图像。我在下面提出的代码几乎可以工作,但是有一个主要缺陷:
此代码仅保留图像的可见性,例如下面的“1.jpg”,其 Class 为 exactly/only "Sunsets"(或 "NSFW," 或其他) .但通常我需要给图像提供不止一个 class,例如区分垂直或属于多个类别的图像。所以我需要代码来保持任何图像的可见性,例如下面的“2.jpg”,其 Class.
中的任何位置都有 "Sunsets"(或其他)JS:
<script>
function filterOn(imageClass) {
var image = document.getElementsByTagName('figure');
for (i = 0; i < image.length; i++) {
if (image[i].className != imageClass) {
image[i].style.display = 'none';
}
}
document.getElementById(imageClass + '-off').innerHTML = 'Undo Filter';
document.getElementById(imageClass + '-off').setAttribute('onClick', "filterOff('" + imageClass + "')");
document.getElementById(imageClass + '-off').id = imageClass + '-on';
}
function filterOff(imageClass) {
var image = document.getElementsByTagName('figure');
for (i = 0; i < image.length; i++) {
if (image[i].className != imageClass) {
image[i].style.display = 'inline-block';
}
}
document.getElementById(imageClass + '-on').innerHTML = 'Show Only ' + imageClass;
document.getElementById(imageClass + '-on').setAttribute('onClick', "filterOn('" + imageClass + "')");
document.getElementById(imageClass + '-on').id = imageClass + '-off';
}
</script>
HTML:
<ul>
<li id="Sunsets-off" onClick="filterOn('Sunsets')">Show Only Sunsets</li>
<li id="NSFW-off" onClick="filterOn('NSFW')">Show Only NSFW</li>
</ul>
<img class="Sunsets" src="1.jpg">
<img class="vertical Sunsets" src="2.jpg">
<img class="NSFW vertical" src="3.jpg">
<img class="Architectural" src="4.jpg">
<img class="Sunsets Landscapes" src="5.jpg">
<img class="Abstract" src="6.jpg">
<img class="NSFW LondonAndrews" src="7.jpg">
那个测试:
if (image[i].className != imageClass) {
确实会检查整个 class 字符串。 有 classList API 做你想做的,将你的测试替换为:
if (!image[i].classList.contains(imageClass)) {
我会通过为所有图像添加 class 名称来简化它,这样您就可以轻松定位所有图像,然后使用切换的 class 隐藏您不想看到的图像.这也使您能够使用 css3 动画淡出您不想看到的图像。
function filterOn( clazz ){
// get all the images using the additional img class
var images = slice(document.getElementsByClassName('img'));
// hide all the images
var ret = images.map(function( image ){
image.classList.add('hide');
return image;
})
// reduce the images to only contain those you want to show
.filter(function( image ){
return image.classList.contains( clazz );
})
// show the image by removing the hide class
.forEach(function( image ){
image.classList.remove('hide');
});
}
// show all images
function showAll(){
var images = slice(document.getElementsByClassName('img'));
images.forEach(function( image ){
image.classList.remove('hide');
});
}
// helper function to get an array from an array like object
function slice( arrayLike ){
return Array.prototype.slice.call( arrayLike );
}
.img {
display: block;
float: left;
margin-left: .8em;
border: .3em solid #aaa;
}
.hide {
display: none;
}
.filters {
display: block;
width: 100%;
float: left;
}
.Sunsets {
border: .3em solid orange;
}
.NSFW {
border: .3em solid magenta;
}
<nav class="filters">
<button id="Sunsets-off" onClick="filterOn('Sunsets')">Show Only Sunsets</button>
<button id="NSFW-off" onClick="filterOn('NSFW')">Show Only NSFW</button>
<button id="show-all" onClick="showAll()">Show All</button>
</nav>
<!-- I added an img class to the images for ease of use later -->
<section class="images">
<img class="img Sunsets" src="http://placehold.it/50/50">
<img class="img vertical Sunsets" src="http://placehold.it/50/50">
<img class="img NSFW vertical" src="http://placehold.it/50/50">
<img class="img Architectural" src="http://placehold.it/50/50">
<img class="img Sunsets Landscapes" src="http://placehold.it/50/50">
<img class="img Abstract" src="http://placehold.it/50/50">
<img class="img NSFW LondonAndrews" src="http://placehold.it/50/50">
</section>