[英]How to change the img of a cloned div onClick
现在,我有一个可爱的代码(最初是用于飘动的雪花),使克隆的div从窗口的顶部落到底部并重复。 问题是我希望单击内容即可更改。 但是,这尚不起作用。
我知道如何在不复制div的情况下更改div的内容,但是在弄清楚如何在代码中克隆一个div的情况下遇到同样的困难。
任何人都有任何提示,我应该做什么,甚至提示要往哪个方向走。 我一无所知。
这是小提琴: http : //jsfiddle.net/4yaxvt7h/
javascript:
function changeImage(){
document.getElementById('toChange').src='https://i.pinimg.com/originals/6e/19/56/6e195649034f042d1dea5230234570a8.gif';
}
// Array to store our Snowflake objects
var snowflakes = [];
// Global variables to store our browser's window size
var browserWidth;
var browserHeight;
// Specify the number of snowflakes you want visible
var numberOfSnowflakes = 15;
// Flag to reset the position of the snowflakes
var resetPosition = false;
// Handle accessibility
var enableAnimations = false;
var reduceMotionQuery = matchMedia("(prefers-reduced-motion)");
// Handle animation accessibility preferences
function setAccessibilityState() {
if (reduceMotionQuery.matches) {
enableAnimations = false;
} else {
enableAnimations = true;
}
}
setAccessibilityState();
reduceMotionQuery.addListener(setAccessibilityState);
//
// It all starts here...
//
function setup() {
if (enableAnimations) {
window.addEventListener("DOMContentLoaded", generateSnowflakes, false);
window.addEventListener("resize", setResetFlag, false);
}
}
setup();
//
// Constructor for our Snowflake object
//
function Snowflake(element, speed, xPos, yPos) {
// set initial snowflake properties
this.element = element;
this.speed = speed;
this.xPos = xPos;
this.yPos = yPos;
this.scale = 1;
// declare variables used for snowflake's motion
this.counter = 0;
this.sign = Math.random() < 0.5 ? 1 : -1;
// setting an initial opacity and size for our snowflake
this.element.style.opacity = 1;
}
//
// The function responsible for actually moving our snowflake
//
Snowflake.prototype.update = function () {
// using some trigonometry to determine our x and y position
this.counter += this.speed / 5000;
this.xPos += this.sign * this.speed * Math.cos(this.counter) / 40;
this.yPos += Math.sin(this.counter) / 40 + this.speed / 30;
this.scale = .5 + Math.abs(10 * Math.cos(this.counter) / 20);
// setting our snowflake's position
setTransform(Math.round(this.xPos), Math.round(this.yPos), this.scale, this.element);
// if snowflake goes below the browser window, move it back to the top
if (this.yPos > browserHeight) {
this.yPos = -50;
}
}
//
// A performant way to set your snowflake's position and size
//
function setTransform(xPos, yPos, scale, el) {
el.style.transform = `translate3d(${xPos}px, ${yPos}px, 0) scale(${scale}, ${scale})`;
}
//
// The function responsible for creating the snowflake
//
function generateSnowflakes() {
// get our snowflake element from the DOM and store it
var originalSnowflake = document.querySelector(".snowflake");
// access our snowflake element's parent container
var snowflakeContainer = originalSnowflake.parentNode;
snowflakeContainer.style.display = "block";
// get our browser's size
browserWidth = document.documentElement.clientWidth;
browserHeight = document.documentElement.clientHeight;
// create each individual snowflake
for (var i = 0; i < numberOfSnowflakes; i++) {
// clone our original snowflake and add it to snowflakeContainer
var snowflakeClone = originalSnowflake.cloneNode(true);
snowflakeContainer.appendChild(snowflakeClone);
// set our snowflake's initial position and related properties
var initialXPos = getPosition(50, browserWidth);
var initialYPos = getPosition(50, browserHeight);
var speed = 5 + Math.random() * 40;
// create our Snowflake object
var snowflakeObject = new Snowflake(snowflakeClone,
speed,
initialXPos,
initialYPos);
snowflakes.push(snowflakeObject);
}
// remove the original snowflake because we no longer need it visible
snowflakeContainer.removeChild(originalSnowflake);
moveSnowflakes();
}
//
// Responsible for moving each snowflake by calling its update function
//
function moveSnowflakes() {
if (enableAnimations) {
for (var i = 0; i < snowflakes.length; i++) {
var snowflake = snowflakes[i];
snowflake.update();
}
}
// Reset the position of all the snowflakes to a new value
if (resetPosition) {
browserWidth = document.documentElement.clientWidth;
browserHeight = document.documentElement.clientHeight;
for (var i = 0; i < snowflakes.length; i++) {
var snowflake = snowflakes[i];
snowflake.xPos = getPosition(50, browserWidth);
snowflake.yPos = getPosition(50, browserHeight);
}
resetPosition = false;
}
requestAnimationFrame(moveSnowflakes);
}
//
// This function returns a number between (maximum - offset) and (maximum + offset)
//
function getPosition(offset, size) {
return Math.round(-1 * offset + Math.random() * (size + 2 * offset));
}
//
// Trigger a reset of all the snowflakes' positions
//
function setResetFlag(e) {
resetPosition = true;
}
HTML
<div id="snowflakeContainer">
<div class="snowflake"><img src="element1.png"
</div>
CSS
body{
background-color: black;
}
#snowflakeContainer {
position: absolute;
left: 0px;
top: 0px;
display: none;
}
.snowflake {
position: fixed;
background-color: red;
user-select: none;
z-index: 1000;
pointer-events: none;
border-radius: 50%;
width: 200px;
height: 200px;
}
img{
max-width: 100%;
}
任何提示都是超级欢迎!!
您在这里有几个不同的问题。 首先,您的CSS设置了pointer-events: none;
用于所有.snowflake
元素。 这将阻止任何点击触发,因此,如果要与鼠标交互,则必须将其删除。
其次,您的changeImage()
函数使用document.getElementById('toChange')
获取要更改其来源的元素。 不存在这样的元素,即使存在,这也意味着单击任何雪花都只会更改该图像的来源。 您需要引用单击的雪花。 一种简单的方法是将this
作为参数传递给onclick属性中的函数:
HTML:
<div class="snowflake"><img src="https://vignette.wikia.nocookie.net/dragonballfanon/images/7/70/Random.png/revision/latest?cb=20161221030547" onclick="changeImage(this)"></div>
JS:
function changeImage(img) {
img.src = 'https://i.pinimg.com/originals/6e/19/56/6e195649034f042d1dea5230234570a8.gif';
}
最后,将JSFiddle配置为将JavaScript的执行延迟到DOM准备就绪为止。 这意味着代码将被包装在回调函数中,因此changeImage()
函数将不再位于全局范围内。 这使得想要在其处理程序中调用它的元素(雪花)无法访问。 因为您已经在自己侦听DOMContentLoaded事件,所以只需将代码更改为可以正常执行,它就可以正常工作。 单击您的JS代码上方的“ JavaScript + jQuery 3.2.1”下拉菜单,然后将加载类型更改为任何“不包装”选项,它应该可以使用。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.