将onClick事件添加到JavaScript以进行循环 [英] adding onClick event to JavaScript for loop
问题描述
我想做的是创建一个应用，其中有26个ID为case0，case1，case2等的盒子.单击时，这些应将黑色"类添加到相应的item0，item1，item2等.我当前的代码如下:
What I am trying to do is to create an App in which there are 26 boxes with ids case0, case1, case2 and so on. When clicked, these should add class 'black' to respective item0, item1, item2 and so on. My current code looks like this:
let num = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25];
let guess = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25];
let i,x;
let arrayShuffle = function(arr){
let newPos,temp;
for (let i = arr.length-1; i > 0; i--) {
newPos=Math.floor(Math.random()*i+1);
temp=arr[i],
arr[i]=arr[newPos];
arr[newPos]=temp;
}
return arr;
};
let numRandom = arrayShuffle(guess);
function suitCase(){
for (x = 0; x < num.length; x++) {
document.getElementById("casePanel").innerHTML+="<a href=\"#\" id=\"case"+numRandom[x]+"\"><div class=\"case\"><span>"+ num[x] + "</span></div></a>";
document.getElementById('case'+numRandom[x]).onclick=function(){clickCase();}
}
};
function clickCase(){
for(x = 0; x < num.length; x++){
document.getElementById('item'+[x]).classList.add('black');
}
}
使用此代码，我遇到两个问题.头等舱黑色"应用于所有非单个项目，并且仅在单击最后一个框后才适用.单击时，其余25个框不执行任何操作.其次，仅当我使用变量numRandom [x]时，整个数组才可见，但如果仅使用[x]或num [x]，则仅可见数组的前两个元素0和1. 有人可以帮我这个忙，并提出更好的代码吗?
With this code I am having two problems. First class 'black' is applied to all items not single and only after I click the last box. Rest of the 25 boxes don't do anything when clicked. And secondly, only if I use variable numRandom[x], the whole array is visible but if I use simply [x] or num[x], just the first two elements of array that is 0 and 1 are visible. Can someone please help me with this and suggest a better code?
这是我的html，以防有人参考:
Here is my html in case someone needs it for reference:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>The Suitcase</title>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body onload="suitCase()">
<div class="container">
<header>
<h1>This is a sample title for this nice suitcase casino</h1>
</header>
<main class="wrap">
<!-- Left price panel -->
<div class="left-panel">
<ul>
<?php
$priceL = [".01","1","5","10","25","50","75","100","200","300","400","500","750"];
for($i=0;$i<count($priceL);$i++){
echo "<li id=\"item$i\">$".$priceL[$i],"</li>";
}
?>
</ul>
</div>
<!-- ./Left price panel -->
<div class="case-panel" id="casePanel">
</div>
<!-- Right price panel -->
<div class="right-panel">
<ul>
<?php
$priceR = ["1000","5000","10,000","25,000","50,000","75,000","100,000","200,000","300,000","400,000","500,000","750,000","1,000,000"];
$x = 13;
for($i=0;$i<count($priceR);$i++){
echo "<li id=\"item$x\">$".$priceR[$i],"</li>";
$x++;
}
?>
</ul>
</div>
<!-- ./Right price panel -->
</main>
<footer></footer>
</div>
</body>
</html>
推荐答案
onclick函数应获取被单击元素的ID.然后用item替换case以获得相应的项目，并将其作为参数传递给clickCase().
The onclick function should get the ID of the element that was clicked. Then replace case with item to get the corresponding item, and pass that as an argument to clickCase().
之所以只有最后一项是可点击的，是因为您每次在循环中都重写document.getElementById("casePanel").innerHTML.这将重新创建所有元素，因此所有先前的元素不再具有其单击处理程序.
The reason only the last item is clickable is because you're rewriting document.getElementById("casePanel").innerHTML each time through the loop. This recreates all the elements, so all the previous elements no longer have their click handlers.
您可以使用insertAdjacentHTML()将HTML添加到元素中，而无需重新解析元素已经包含的内容.
You can use insertAdjacentHTML() to add HTML to an element without reparsing what it already contains.
let num = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25];
let guess = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25];
let i, x;
let arrayShuffle = function(arr) {
let newPos, temp;
for (let i = arr.length - 1; i > 0; i--) {
newPos = Math.floor(Math.random() * i + 1);
temp = arr[i],
arr[i] = arr[newPos];
arr[newPos] = temp;
}
return arr;
};
let numRandom = arrayShuffle(guess);
suitCase();
function suitCase() {
for (x = 0; x < num.length; x++) {
document.getElementById("casePanel").insertAdjacentHTML('beforeend', "<a href=\"#\" id=\"case" + numRandom[x] + "\"><div class=\"case\"><span>" + num[x] + "</span></div></a>");
document.getElementById('case' + numRandom[x]).onclick = function() {
clickCase(this.id.replace('case', 'item'));
}
}
};
function clickCase(id) {
document.getElementById(id).classList.add('black');
}
.black {
background-color: blue;
}
<div class="container">
<header>
<h1>This is a sample title for this nice suitcase casino</h1>
</header>
<main class="wrap">
<!-- Left price panel -->
<div class="left-panel">
<ul>
<li id="item0">$.01</li>
<li id="item1">$1</li>
<li id="item2">$5</li>
<li id="item3">$10</li>
<li id="item4">$25</li>
<li id="item5">$50</li>
<li id="item6">$75</li>
<li id="item7">$100</li>
<li id="item8">$200</li>
<li id="item9">$300</li>
<li id="item10">$400</li>
<li id="item11">$500</li>
<li id="item12">$750</li>
</ul>
</div>
<!-- ./Left price panel -->
<div class="case-panel" id="casePanel">
</div>
<!-- Right price panel -->
<div class="right-panel">
<ul>
<li id="item13">$1000</li>
<li id="item14">$5000</li>
<li id="item15">$10,000</li>
<li id="item16">$25,000</li>
<li id="item17">$50,000</li>
<li id="item18">$75,000</li>
<li id="item19">$100,000</li>
<li id="item20">$200,000</li>
<li id="item21">$300,000</li>
<li id="item22">$400,000</li>
<li id="item23">$500,000</li>
<li id="item24">$750,000</li>
<li id="item25">$1,000,000</li>
</ul>
</div>
<!-- ./Right price panel -->
</main>
<footer></footer>
</div>
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