javascript 如何删除javascript中的附加子元素
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how to remove the append child element in javascript
提问by thu
<label id="1" >a</label><label id="2" > b </label>
I have two labels created. When a label is clicked, I create a divelement within that I displayed. Now I need to remove the created divelement if the label is again clicked.
我创建了两个标签。单击标签时div，我会在显示的元素中创建一个元素。现在，div如果再次单击标签，我需要删除创建的元素。
if (click == 1) {
var prevWin = document.createElement("div");
prevWin.id = 1;
prevWin.innerHTML = outMsg;
document.body.appendChild(prevWin);
} else {
var prevWin = document.body.getElementsById(1);
document.body.removeChild(prevWin);
}
When a label is clicked the divelement is created successfully. But when it is clicked again, the divelement is not removed.
单击标签时，该div元素将成功创建。但是当再次单击时，该div元素不会被删除。
回答by Matt
function labelOnClick () {
var divs = this.getElementsByTagName("div");
if (divs.length) {
divs[0].parentNode.removeChild(divs[0]);
} else {
var div = document.createElement("div");
div.innerHTML = outMsg;
this.appendChild(div);
}
}
idshave got to be unique throughout the DOM; in your example, it looks like you'll have the label and the div with the same id. You could easily append a string to the divid, if you want it to have an id (div.id = this.id + "_div").
ids在整个 DOM 中必须是唯一的；在您的示例中，看起来您将拥有具有相同 ID 的标签和 div。div如果您希望它有一个 id ( div.id = this.id + "_div") ，您可以轻松地将一个字符串附加到id 上。
My example wont work if you have more than one div in your label; in which case the ID approach would be best (or use a selector library).
如果您的标签中有多个 div，我的示例将不起作用；在这种情况下，ID 方法将是最好的（或使用选择器库）。
Id's could be approached as follows:
可以按如下方式处理 Id：
function labelOnClick () {
function makeDivId(id) {
return id + "_div";
};
var div = this.getElementById(makeDivId(this.id));
if (div) {
div.parentNode.removeChild(div);
} else {
div = document.createElement("div");
div.innerHTML = outMsg;
div.id = makeDivId(this.id);
this.appendChild(div);
}
}
