Predictive Text

<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Predictive Text</title>
    
    <link
      href="https://fonts.googleapis.com/css2?family=Poppins:wght@500&display=swap"
      rel="stylesheet"
    />
    
    <style>

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}
body {
  background-color: #2c8df6;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.input-container {
  position: relative;
  background-color: #ffffff;
  width: 25em;
  height: 4.4em;
  border-radius: 5px;
}
input {
  outline: none;
  border: none;
  background-color: transparent;
  position: absolute;
  width: inherit;
  height: inherit;
  color: #000000;
  font-size: 25px;
  padding: 0 18px;
  z-index: 3;
}
#suggestion {
  width: inherit;
  height: inherit;
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  padding: 0 18px;
  font-size: 25px;
  color: #868686;
}
@media screen and (max-width: 600px) {
  .input-container {
    width: 80vw;
  }
}

</style>
  </head>
  <body>
    <div class="input-container">
      <input
        type="text"
        id="input"
        placeholder="Type something here.."
        autocomplete="off"
      />
      <span id="suggestion"></span>
    </div>
    
    <script>

let words = [
  "Apple",
  "Pencil",
  "Pen",
  "Chair",
  "Helmet",
  "Grapes",
  "Tub",
  "Trophy",
  "Cookie",
  "Donut",
  "Shirt",
  "Bat",
  "Ash",
  "Bell",
  "Chat",
  "Ball",
  "Eye",
  "Fish",
  "Zip",
  "Game",
  "Juice",
  "Orange",
  "Fan",
  "Ice",
];
words.sort();
let input = document.getElementById("input");
let suggestion = document.getElementById("suggestion");
//Enter key code
const enterKey = 13;

window.onload = () => {
  input.value = "";
  clearSuggestion();
};

const clearSuggestion = () => {
  suggestion.innerHTML = "";
};

//Execute function on input
input.addEventListener("input", (e) => {
  clearSuggestion();
  //Convert input value to regex since string.startsWith() is case sensitive
  let regex = new RegExp("^" + input.value, "i");
  //loop through words array
  for (let i in words) {
    //check if input matches with any word in words array
    if (regex.test(words[i]) && input.value != "") {
      //Change case of word in words array according to user input
      words[i] = caseCheck(words[i]);
      //display suggestion
      suggestion.innerHTML = words[i];
      break;
    }
  }
});

//Complete predictive text on enter key
input.addEventListener("keydown", (e) => {
  //When user presses enter and suggestion exists
  if (e.keyCode == enterKey && suggestion.innerText != "") {
    e.preventDefault();
    input.value = suggestion.innerText;
    //clear the suggestion
    clearSuggestion();
  }
});

</script>
  </body>
</html>

demo

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