javascript - 我怎样才能 document.getElementbyID 的变量?
问题描述
我想对span
基于它们的某些元素进行更改id
。
所以我给每一个div
和span
一个id
,然后我尝试给.style.color
每一个span
。
但是会看到一个错误:Cannot read property 'style' of null"
我不知道我做错了什么。
这是我的程序的简单可复制模型
for (y = 0; y < 7; y++) {
let colonne = document.createElement("div");
colonne.className = "horaire_one";
colonne.id = ("col" + y);
for (x = 0; x < 26; x++) {
let span = document.createElement("span");
span.className = "pasdispo_one_rpv";
span.id = (colonne.id + x);
document.getElementById(span).style.color = "green";
}
}
解决方案
您试图在将元素添加到 DOM 之前从 DOM 中引用它。你不会找到它。创建跨度时,您已经拥有对跨度的引用。
for (let y = 0; y < 7; y++) {
let colonne = document.createElement("div");
colonne.className = "horaire_one";
colonne.id = "col" + y;
for (let x = 0; x < 26; x++) {
let span = document.createElement("span");
span.className = "pasdispo_one_rpv";
span.id = colonne.id + (x + y * 26);
span.style.color = "green";
span.textContent = x + y * 26;
colonne.appendChild(span);
}
document.body.append(colonne);
}
.pasdispo_one_rpv {
border: 1px solid black;
width: 1.4em;
display: inline-block;
}
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