LIFF App template

index.html

{% extends "bootstrap/base.html" %} 
{%- block metas %}
    <meta name="vieport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scaleable=0"> 
{%- endblock metas %} 
{% block scripts %}
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
    crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/signature_pad@2.3.2/dist/signature_pad.min.js"></script>
<script>
    const canvas = document.querySelector('#canvas');
    const signaturePad = new SignaturePad(canvas, {
        backgroundColor: 'rgba(240,240,240,1)',
        minWidth: 3,
        maxWidth: 7,
    })

    $(window).on('load', function () {
        canvas.setAttribute('width', $('.container-fluid').width());
        canvas.setAttribute('height', window.innerHeight - $('#btn').outerHeight() - 10);
        signaturePad.clear();

        liff.init(function (data) { });
    });

</script>
<script src="https://d.line-scdn.net/liff/1.0/sdk.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script>
    $("#btn__undo").on('click', function (e) {
        var data = signaturePad.toData();
        if (data) {
            data.pop();
            signaturePad.fromData(data);
        }
    })
    $('#btn').on('click', function () {
        $.ajax({
            type: 'POST',
            url: '/saveimage',
            data: {
                'image': signaturePad.toDataURL('image/jpeg')
            },
            success: function (res, status) {

                liff.getProfile().then(function (profile) {

                    liff.sendMessages([
                        {
                            type: 'image',
                            originalContentUrl: 'https://drawr.serveo.net/imgs/' + res + '.jpg',
                            previewImageUrl: 'https://drawr.serveo.net/imgs/' + res + '_240.jpg'
                        },
                        {
                            type: 'text',
                            text: 'Sender: ' + profile.displayName
                        }
                    ]).then(function () {

                        liff.closeWindow();
                    }).catch(function (error) {
                        window.alert("Error getting profile: " + error.message);
                    })
                })
            },
            error: function (res) {
                window.alert('Error saving image: ' + res.status);
            },
            complete: function (data) {

            }
        });
    });
</script> 
{% endblock scripts %} 

{% block title %}DRAWR{% endblock title %} 

{% block content %}
<div class="container-fluid">
    <canvas id="canvas"></canvas>
    <div class="row">
        <div class="col col-sm-6">
            <button id="btn__undo" class="btn btn-primary btn-block btn-lg" type="button">Undo</button>
        </div>
        <div class="col col-sm-6">
            <button id="btn" class="btn btn-primary btn-block btn-lg" type="button">Send</button>
        </div>
    </div>
</div>
{% endblock content %}