python - Validate WTForm before submitting -

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is possible validate wtform field after leaving field before submit? example, after entering username, field validated see if available , shows checkmark, before user clicks submit.

when field changed, perform check , change text in adjacent node. things can validated directly in browser. validate against data on server, send request javascript view checks data , returns json response.

@app.route('/username-exists', methods=['post']) def username_exists():     username = request.form['username']     exists = check_if_user_exists(username)     return jsonify(exists=exists) 
<input id='username' name='username'> <p id='username-status'></p> 
var username_input = $('#username'); var username_status = $('#username-status');  $('#username').on('focusout', function () {     $.post(         "{{ url_for('username_exists') }}",         {             username: username_input.val()         },         function (data) {             username_status.text(data.exists ? '✔️' : '🙅');         }     ); });

this example uses jquery, concept not specific library.

alternatively, post entire form separate view validates fields, return jsonify(form.errors) , them in browser. code same above, logic put error messages next correct fields.

remember still validate data when form submitted, requests can made outside browser other


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