A step-by-step guide to invoking a function upon submitting a form with an external JavaScript file

Question

A step-by-step guide to invoking a function upon submitting a form with an external JavaScript file

How can I execute a function when the user submits a form using an external JavaScript file?

index.html

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="utf-8">
            <title>example</title>
            <link rel="stylesheet" type="text/css" href="style.css">
            <script type="text/javascript" src="main.js"></script>
        </head>
            <body>
                <h1 class="title">example</h1>
                
                <form onsubmit="a()">
                    <input type="text" class="input1" name="verb" id="verb" placeholder="Verb"/>
                </form>
                
            </body>
    </html>

main.js

    function a(){
        alert("Submitting Form");
    }

javascript html css

Answer 1

Answer №1

Use the following code snippet...

This is an HTML file

 <!DOCTYPE html>
 <html>

 <head>
     <meta charset="utf-8">
     <title>example</title>
     <link rel="stylesheet" type="text/css" href="style.css"> 
 </head>

 <body>
     <h1 class="title">example</h1>
     <form >
         <input type="text" name="text" id="input" placeholder="Action" />
         <input type="submit" onclick="b()">
     </form>
     <script src="./index.js"></script>
 </body>

 </html>

JavaScript File

 function b() {
    
     alert('hi');
 }

Answer 2

Use the following code snippet...

This is an HTML file

 <!DOCTYPE html>
 <html>

 <head>
     <meta charset="utf-8">
     <title>example</title>
     <link rel="stylesheet" type="text/css" href="style.css"> 
 </head>

 <body>
     <h1 class="title">example</h1>
     <form >
         <input type="text" name="text" id="input" placeholder="Action" />
         <input type="submit" onclick="b()">
     </form>
     <script src="./index.js"></script>
 </body>

 </html>

JavaScript File

 function b() {
    
     alert('hi');
 }

Answer 3

Answer №2

To incorporate external JavaScript files, you can attach an event listener to the onsubmit event of a form and insert the external scripts using the script tag.

For example: how to include an external JS file.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>test</title>
        <link rel="stylesheet" type="text/css" href="style.css">
        <script src="./main.js"></script>
    </head>
        <body>
           //.. HTML content
        </body>
</html>

Implementation Example:

let formElem = document.getElementById("form");
formElem.addEventListener("submit", formSubmitHandler);
function formSubmitHandler(event) {
  event.preventDefault();
  console.log("Form submitted");
  console.log("User entered: " + event.target.elements[0].value);
}

<h1 class="title">test</h1>
    <form id="form">
      <input
        type="input1"
        class="input1"
        name="verb"
        id="verb"
        placeholder="Verb"
      />
      <button type="submit" >Submit</button>
    </form>

You can define the formSubmitHandler function in the main.js file.

Answer 4

To incorporate external JavaScript files, you can attach an event listener to the onsubmit event of a form and insert the external scripts using the script tag.

For example: how to include an external JS file.

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>test</title>
        <link rel="stylesheet" type="text/css" href="style.css">
        <script src="./main.js"></script>
    </head>
        <body>
           //.. HTML content
        </body>
</html>

Implementation Example:

let formElem = document.getElementById("form");
formElem.addEventListener("submit", formSubmitHandler);
function formSubmitHandler(event) {
  event.preventDefault();
  console.log("Form submitted");
  console.log("User entered: " + event.target.elements[0].value);
}

<h1 class="title">test</h1>
    <form id="form">
      <input
        type="input1"
        class="input1"
        name="verb"
        id="verb"
        placeholder="Verb"
      />
      <button type="submit" >Submit</button>
    </form>

You can define the formSubmitHandler function in the main.js file.

A step-by-step guide to invoking a function upon submitting a form with an external JavaScript file

Answer №1

This is an HTML file

JavaScript File

Answer №2

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