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HTML

              
                <div class="widget-wrap">
  <h1>SIMPLE JS TAGGING</h1>
  
  <div id="demo"></div>
  <small>Hit enter or comma to add a tag.</small>
  
  <!-- (X) VISIT CODE-BOXX -->
  <div id="code-boxx">
    Visit
    <a href="https://code-boxx.com/simple-javascript-tagging/" target="_blank">
      Code Boxx
    </a> for more details.
  </div>
</div>
              
            
!

CSS

              
                /* (A) WRAPPER */
.tagwrap {
  display: flex;
  border: 2px solid #aaa;
}

/* (B) SHARED TAGS */
.tagwrap .tag, .tagwrap .tagin {
  margin: 10px 5px;
  padding: 10px;
}

/* (C) TAGS */
.tagwrap .tag {
  color: #fff;
  background: #2d7dc1;
  cursor: pointer;
}
.tagwrap .tag::after {
  content: "X";
  padding-left: 20px;
}

/* (D) TAG INPUT */
.tagwrap .tagin {
  flex-grow: 1;
  background: none;
  border: 0;
}
.tagwrap .tagin:focus {
  outline-width: 0;
  outline: none;
}

/* (X) DOES NOT MATTER - COSMETICS */
/* PAGE & BODY */
* {
  font-family: arial, sans-serif;
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center; justify-content: center;
  min-height: 100vh;
  background-image: url(https://images.unsplash.com/photo-1562869313-311646d454b1?crop=entropy&cs=srgb&fm=jpg&ixid=MnwzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE2NTI0MTc4MjE&ixlib=rb-1.2.1&q=85);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  text-align: center;
}

/* WIDGET */
.widget-wrap {
  width: 600px;
  padding: 30px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
}

/* FOOTER */
#code-boxx {
  font-weight: 600;
  margin-top: 30px;
}
#code-boxx a {
  display: inline-block;
  border: 0;
  padding: 5px;
  text-decoration: none;
  background: #b90a0a;
  color: #fff;
}
              
            
!

JS

              
                var taggr = {
  // (A) ATTACH TAGGING
  attach : (instance) => {
    // (A1) TAGS WRAPPER
    instance.target.classList.add("tagwrap");

    // (A2) ATTACH INPUT FIELD
    instance.tagin = document.createElement("input");
    instance.tagin.type = "text";
    instance.tagin.className = "tagin";
    if (instance.maxLength !== undefined) { instance.tagin.maxLength = instance.maxLength; }
    instance.target.appendChild(instance.tagin);

    // (A3) COMMA OR ENTER TO ADD TAG
    instance.tagin.onkeyup = (evt) => {
      if (evt.code=="Comma" || evt.code=="Enter") {
        if (instance.tagin.value=="," || instance.tagin.value=="") {
          instance.tagin.value = "";
        } else {
          taggr.add(instance, instance.tagin.value.replace(/,/g, ""));
        }
      }
    };

    // (A4) ATTACH DEFAULT TAGS
    if (instance.tags !== undefined) {
      instance.tags.forEach((name, i) => {
        taggr.add(instance, name);
      });
    }

    // (A5) GET TAGS
    instance.target.getTags = () => {
      let tags = [];
      Array.from(instance.target.querySelectorAll(".tag")).forEach((tag) => {
        tags.push(tag.innerHTML);
      });
      return tags;
    };
  },

  // (B) ADD A NEW TAG
  add : (instance, name) => {
    // (B1) CHECK MAX TAGS
    if (instance.maxTags !== undefined) {
      let count = instance.target.querySelectorAll(".tag").length;
      if (count >= instance.maxTags) {
        alert(`Maximum ${instance.maxTags} tags allowed.`);
        return;
      }
    }

    // (B2) CREATE & APPEND NEW TAG
    let tag = document.createElement("div");
    tag.className = "tag";
    tag.innerHTML = name;
    tag.onclick = () => { tag.remove(); };
    instance.target.insertBefore(tag, instance.tagin);

    // (B3) EMPTY TAG INPUT
    instance.tagin.value = "";
  }
};

// (C) ATTACH TAGGING
window.onload = () => {
  taggr.attach({
    target : document.getElementById("demo"),
    tags : ["Doge", "Cate"], // optional
    maxLength : 12, // optional
    maxTags : 3 // optional
  });
};
              
            
!
999px

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