Hi, I have a flask app and I've added a button, 

I need the button to open a popup where I have a slider that goes from 500 to 15000 and when I press ok there will be a post request, post reqest details I can add myself
I'll walk you through each step:

### 1. Add a button

Here's a simple HTML button:

```html
<button id=openPopup>Open Popup</button>
```

### 2. Implement a popup

We can use Bootstrap's Modal component for this. Make sure to include Bootstrap's CSS and JS files in your template if you haven't already:

```html
<!-- Include Bootstrap CSS -->
<link href=https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css rel=stylesheet>

<!-- Include Bootstrap JS and Popper.js -->
<script src=https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js></script>
<script src=https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js></script>
<script src=https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js></script>
```

Modal HTML:

```html
<div class=modal fade id=sliderModal tabindex=-1 role=dialog>
  <div class=modal-dialog role=document>
    <div class=modal-content>
      <div class=modal-header>
        <h5 class=modal-title>Select Value</h5>
        <button type=button class=close data-dismiss=modal aria-label=Close>
          <span aria-hidden=true>&times;</span>
        </button>
      </div>
      <div class=modal-body>
        <input type=range id=rangeSlider min=500 max=15000 value=500>
        <span id=sliderValue>500</span>
      </div>
      <div class=modal-footer>
        <button type=button class=btn btn-primary id=confirmButton>OK</button>
        <button type=button class=btn btn-secondary data-dismiss=modal>Close</button>
      </div>
    </div>
  </div>
</div>
```

### 3. Slider interaction

Using JavaScript, we can show the modal when the button is clicked, and display the slider's value:

```javascript
document.getElementById('openPopup').addEventListener('click', function() {
    $('#sliderModal').modal('show');
});

document.getElementById('rangeSlider').addEventListener('input', function() {
    document.getElementById('sliderValue').textContent = this.value;
});
```

### 4. Implement the POST request logic

Finally, using AJAX, you can make the POST request:

```javascript
document.getElementById('confirmButton').addEventListener('click', function() {
    let sliderValue = document.getElementById('rangeSlider').value;

    $.ajax({
        type: POST,
        url: /your_endpoint,  // replace with your Flask route
        data: {
            value: sliderValue
        },
        success: function(response) {
            // handle success
            $('#sliderModal').modal('hide');  // close the modal
        },
        error: function(error) {
            // handle error
        }
    });
});
```

In your Flask app, handle the POST request:

```python
from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/your_endpoint', methods=['POST'])
def handle_post():
    value = request.form.get('value')
    # Do something with the value
    return jsonify(status=success)
```

With these steps, when you click the Open Popup button, a modal will open with a slider. After adjusting the slider and clicking OK, a POST request will be made to your Flask app with the selected value. Adjust the endpoint and any other necessary details accordingly.
Why do you need all those javascript libraries?
hhhhuuu