How to do a Redirect to an HTTP POST Request with Javascript? I summarized 5 ways to redirect URLs. (The purpose of the script below is to perform a local redirect using Javascript.)
Here are the five methods:
1. **Using a Form Submission**: Create an HTML form and set its method to "POST". You can programmatically submit this form using JavaScript.
```html
document.getElementById('redirectForm').submit();
```
2. **Using Fetch API**: Although `fetch` doesn't directly cause a page redirection, you can make a POST request and handle the response accordingly.
```javascript
fetch('https://example.com/target', {
method: 'POST',
body: JSON.stringify({ key: 'value' }),
headers: { 'Content-Type': 'application/json' }
}).then(response => {
if (response.ok) {
window.location.href = 'https://example.com/redirected';
}
});
```
3. **Using XMLHttpRequest**: Similar to the Fetch API, you can use `XMLHttpRequest` to send a POST request.
```javascript
var xhr = new XMLHttpRequest();
xhr.open('POST', 'https://example.com/target', true);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onreadystatechange = function() {
if (xhr.readyState === 4 && xhr.status === 200) {
window.location.href = 'https://example.com/redirected';
}
};
xhr.send(JSON.stringify({ key: 'value' }));
```
4. **Using JavaScript to Dynamically Create and Submit a Form**: This is similar to Method 1 but done entirely in JavaScript.
```javascript
function redirectToPost(url, data) {
var form = document.createElement("form");
form.setAttribute("method", "post");
form.setAttribute("action", url);
for(var key in data) {
if(data.hasOwnProperty(key)) {
var hiddenField = document.createElement("input");
hiddenField.setAttribute("type", "hidden");
hiddenField.setAttribute("name", key);
hiddenField.setAttribute("value", data[key]);
form.appendChild(hiddenField);
}
}
document.body.appendChild(form);
form.submit();
}
redirectToPost('https://example.com/target', { key: 'value' });
```
5. **Using an iFrame**: You can also trigger a POST request within an iframe and optionally navigate the parent window after the POST is complete.
```html
document.getElementById('redirectForm').submit();
// Optionally redirect the main window after the POST completes
setTimeout(function() {
window.location.href = 'https://example.com/redirected';
}, 1000); // Adjust timeout as needed
```
Each of these methods has different use cases depending on your specific requirements, such as whether you need to pass data along with the redirect or handle responses differently.