Dynamically created HTML table immediately disappears using Flask and jQuery

Question

I'm using Flask (Flask API link) to create a very simple website that takes an 'order_id' and uses a MySQL database (MYSQL - Python API link) in the background to finally return the associated items for that order_id in a table.

It all works well, except that the table only flashes for a second the moment I submit the order_id. It works every time I submit, but the table just won't stay.

My Python (Flask) code:

@app.route('/fetch_order', methods=['POST'])
def fetch_order():
    order_id    = request.form.get('order_id')
    order       = connect_db.fetch_order_json(order_id)
    order       = json.dumps(order)
    return order

@app.route('/', methods=['GET', 'POST'])
def index():
    return render_template('index.html')

if __name__ == '__main__':
    app.run(debug=True, port=5440)

My JS / jQuery:

$(document).ready( function() { 
    $("#order_id").submit( function() { 
        var order_id    = $('#order_id :text').val(); 
        var dataString  = 'order_id=' + encodeURIComponent(order_id);
        var body_rows   = [];
        var html        = '<tr>';

        $.ajax({
                type: "POST",
                data: dataString,
                url : "/fetch_order",

                success: function(json) {
                data = JSON.parse(json);

                if (data) {
                    $.each(data, function (index, data_list) {
                        data_dict = JSON.parse(data_list);
                        headers = Object.keys(data_dict);
                        body_rows += '<tr>';

                        $.each(data_dict, function (ignore, value) {
                            body_rows += '<td>' + value + '</td>';
                        });
                    body_rows += '</tr>'
                    });

                    $.each(headers, function (index, header) {
                        html += '<th>' + header + '</th>';
                    });

                    html += '</tr>';
                    html += body_rows;

                    // --> working but only for a second?!
                    $('#orders_table').append(html);
                }; },
                error: ...

My html:

<div>
    <form id="order_id" accept-charset="utf-8">
        <input type="text" name="order_id" autofocus><br>
        <input type="button" value="Submit">
    </form>
</div>
<div>
    <table id="orders_table">
    </table>
</div>

The answers to the following questions didn't help me (or I just didn't understand them well enough):

My gut tells me it has to do with the ($.each()) loops but I just can't seem to figure it out. Any push into the right direction would be greatly appreciated!

EDIT:

tried to reduce complexity by hardcoding the headers in html to no avail
tried to rewrite jQuery to JS in case it's a jQuery thing, but it looks like it's not
tried moving around $('#orders_table').append(table_html);, adding .show(), plugging it into ajaxComplete() instead, .. all to no avail

Would really love some help here!

dennisdee · Accepted Answer · 2018-08-21 15:43:54Z

2

Alright, after having refactored, re-written, and lost my sanity over this, the issue was a lot less complex than I thought. Turns out html form submissions reload the page by default.

All I had to do was to add return false at the end of my jQuery function that processes order_id and generates the html.. Head -> Table! Thanks for confirming goes to Don't reload webpage after flask ajax request

Thanks to this rather silly troubleshooting madness, I learnt a lot about (almost unrelated) callbacks and the new async/await possibilities. For those who are interested, this post is golden: jQuery: Return data after ajax call success

answered Aug 21, 2018 at 15:43

dennisdee

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