Highlights of JavaScript — Field Values, Images, and Text

Highlights of JavaScript — Field Values, Images, and Text

To learn JavaScript, we must learn the basics.

To learn JavaScript, we must learn the basics.

In this article, we’ll look at the most basic parts of the JavaScript language.

Setting Field Values

We can set input field values by using JavaScript.

For example, we can write the following HTML:

<form>
  fruit:<br>
  <input type="text" id="fruit" onBlur="fillColor();"><br>
  color:<br>
  <input type="text" id="color">
</form>

Then we can write the following JavaScript code:

const fillColor = () => {
  let color;
  const {
    value
  } = document.getElementById("fruit");
  switch (value) {
    case "apple":
      color = "red";
      break;
    case "orange":
      color = "orange";
      break;
    case "grape":
      color = "purple";
  }
  document.getElementById("color").value = color;
}

We added the onBlur attribute to the first input box.

So when we move the cursor away from the first input, the fillColor function is called.

Them we get the value if the input with ID fruit ‘s value with the value property.

Then we set the color variable’s value with according to the value of value .

We then set the input with ID color ‘s value with the value of the color variable.

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