How to add a given label option in JavaScript? (code example)

This chapter will introduce how to use tag JavaScript to add a given tag option? (code example). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Let’s take a look at the renderings first:

Code implementation:

HTML code:

<h3>haveTags</h3>
<div id="havetags"></div>
<hr />
<h3>addTags</h3>
<div id="addtags"></div>
<button id="btn">返回的数组</button>

css Code:

#havetags span,
#addtags span {
    display: inline-block;
    padding: 0 0 0 10px;
    margin: 2px 5px;
    border: 1px solid #000;
}

#havetags span::after,
#addtags span::after {
    content: "+";
    display: inline-block;
    padding: 0 10px;
    background-color: #00ffff;
    margin-left: 5px;
}

#addtags span::after {
    content: "x";
}

js code:

// 拥有的标签
var haveArr = ["HTML", "CSS", "JavaScript", "jQuery", "Vue", "Bootstrap"];

// 添加的标签
var addArr = ["PHP", "MySQL"];

/**
 * [tagsShow 展示拥有的标签]
 * @param  {[String]} haveTagsId [展示拥有标签的HTML标签Id]
 * @param  {[String]} addTagsId  [展示添加标签的HTML标签Id]
 * @param  {[Array]} haveTags   [拥有标签的数组]
 * @param  {[Array]} addTags    [添加标签的数组]
 */
function tagsShow(haveTagsId, addTagsId, haveTags, addTags) {

	for(var i = 0; i < haveTags.length; i++) {

		document.getElementById(haveTagsId).innerHTML += "<span>" + haveTags[i] + "</span>";

	}

	addTag(haveTagsId, addTagsId, haveArr, addArr);

	for(var i = 0; i < addTags.length; i++) {

		document.getElementById(addTagsId).innerHTML += "<span>" + addTags[i] + "</span>";

	}

	delTag(haveTagsId, addTagsId, haveTags, addTags);

}

/**
 * 添加标签
 * @param  {[String]} haveTagsId [展示拥有标签的HTML标签Id]
 * @param  {[String]} addTagsId  [展示添加标签的HTML标签Id]
 * @param  {[Array]} haveTags   [拥有标签的数组]
 * @param  {[Array]} addTags    [添加标签的数组]
 */
function addTag(haveTagsId, addTagsId, haveTags, addTags) {

	var len = document.getElementById(haveTagsId).children.length;

	for(var i = 0; i < len; i++) {

		document.getElementById(haveTagsId).children[i].onclick = function() {

			this.remove();

			addTags.push(this.innerHTML);

			document.getElementById(addTagsId).innerHTML += "<span>" + this.innerHTML + "</span>";

			haveTags.splice(haveTags.indexOf(this.innerHTML), 1); // 从数组中删除该元素

			delTag(haveTagsId, addTagsId, haveTags, addTags);
		}

	}

}

/**
 * 删除标签
 * @param  {[String]} haveTagsId [展示拥有标签的HTML标签Id]
 * @param  {[String]} addTagsId  [展示添加标签的HTML标签Id]
 * @param  {[Array]} haveTags   [拥有标签的数组]
 * @param  {[Array]} addTags    [添加标签的数组]
 */
function delTag(haveTagsId, addTagsId, haveTags, addTags) {

	var len = document.getElementById(addTagsId).children.length;

	for(var i = 0; i < len; i++) {

		document.getElementById(addTagsId).children[i].onclick = function() {

			this.remove();

			haveTags.push(this.innerHTML);

			document.getElementById(haveTagsId).innerHTML += "<span>" + this.innerHTML + "</span>";

			addTags.splice(addTags.indexOf(this.innerHTML), 1); // 从数组中删除该元素

			addTag(haveTagsId, addTagsId, haveTags, addTags);

		}

	}

}

// 展示标签
tagsShow(&#39;havetags&#39;, &#39;addtags&#39;, haveArr, addArr);

// 最终数组
document.getElementById("btn").onclick = function() {

	console.log(haveArr);

	console.log(addArr);

}

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