Capturing the response from a dynamically created form submission in JavaScript

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1

Hey everyone, I’m working on a project where I need to create a form dynamically using JavaScript and submit it right away. Here’s what I’ve got so far:

const form = document.createElement('form');
form.method = 'post';
form.action = someUrl;

// Add hidden inputs
dataFields.forEach(field => {
  const input = document.createElement('input');
  input.type = 'hidden';
  input.name = field.key;
  input.value = field.value;
  form.appendChild(input);
});

document.body.appendChild(form);
form.submit();

This works fine for sending the data, but I’m stuck on how to get the response back. Is there a way to capture the server’s reply after submitting the form this way? Any tips or tricks would be super helpful. Thanks!

2

To capture the response from a dynamically created form submission, you might want to consider using the XMLHttpRequest object or the Fetch API instead of directly submitting the form. Here’s an approach using XMLHttpRequest:

const xhr = new XMLHttpRequest();
xhr.open('POST', someUrl, true);
xhr.onload = function() {
    if (xhr.status === 200) {
        const response = JSON.parse(xhr.responseText);
        // Handle the response data here
        console.log(response);
    } else {
        console.error('Request failed. Status:', xhr.status);
    }
};

const formData = new FormData(form);
xhr.send(formData);

This method allows you to send the form data asynchronously and handle the server’s response in the onload callback. It gives you more control over the submission process and error handling.

3

hey mate, u could try using fetch() instead. it lets u send the form data AND get the response. something like:

fetch(someUrl, {
  method: 'POST',
  body: new FormData(form)
})
.then(response => response.json())
.then(data => console.log(data))

this way u get the response data to work with. hope that helps!

4

I faced a similar issue in a project recently. Instead of creating and submitting the form directly, I found that using the Fetch API with async/await syntax worked wonders. Here’s what I did:

async function submitFormData(dataFields, someUrl) {
  const formData = new FormData();
  dataFields.forEach(field => formData.append(field.key, field.value));

  try {
    const response = await fetch(someUrl, {
      method: 'POST',
      body: formData
    });

    if (!response.ok) throw new Error('Network response was not ok');

    const data = await response.json();
    // Handle your response data here
    console.log(data);
  } catch (error) {
    console.error('Error:', error);
  }
}

This approach gives you full control over the request and response handling. It’s cleaner, more modern, and easier to manage error scenarios. Plus, it doesn’t require appending a form to the DOM, which keeps things tidy.