AJAX/FLASK/JS: How to POST existing array into endpoint
To POST an existing array into an endpoint using Flask, AJAX, and JavaScript (JS), you can follow the steps below:
Step 1: Create an HTML file with a form and a button that triggers the AJAX request.
Step 2: In the JavaScript section of the HTML file, write a function that handles the AJAX request.
Step 3: Inside the function, create an empty array variable to store the data.
Step 4: Use JavaScript to iterate through the existing array, and push each element into the empty array.
Step 5: Convert the array into a JSON string using the JSON.stringify() method.
Step 6: Make an AJAX POST request to the Flask endpoint URL, passing the JSON string as the data payload.
Step 7: In the Flask app, create a route that listens for the POST request from the AJAX request.
Step 8: Inside the route function, access the JSON data using request.get_json().
Step 9: Process the data as needed in the Flask app.
Here is an example of how you can implement these steps in your code:
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
<form id="myForm">
<button type="button" onclick="postData()">Submit</button>
</form>
<script>
function postData() {
var existingArray = [1, 2, 3, 4, 5];
var newArray = [];
for (var i = 0; i < existingArray.length; i++) {
newArray.push(existingArray[i]);
}
var jsonData = JSON.stringify(newArray);
$.ajax({
url: '/endpoint',
type: 'POST',
contentType: 'application/json',
data: jsonData,
success: function(response) {
console.log(response);
}
});
}
</script>
</body>
</html>
In your Flask app, you can define the endpoint route and process the data as follows:
from flask import Flask, request
app = Flask(__name__)
@app.route('/endpoint', methods=['POST'])
def endpoint():
data = request.get_json()
# Process the data as needed
return 'Data received'
if __name__ == '__main__':
app.run()
These steps should allow you to successfully POST an existing array into an endpoint using Flask, AJAX, and JS.