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jquery.snowshoe.js
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jquery.snowshoe.js
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/*
Snowshoe jQuery (https://github.com/snowshoestamp/snowshoe_jquery)
jquery.snowshoe.js
Version 0.3.3
See GitHub project page for Documentation and License
*/
(function ($) {
$.snowshoe = {
stampScreen: {
init: function (configs, client) {
var stampScreenElmId = configs.stampScreenElmId || "snowshoe-stamp-screen";
var progressAnimationOn = configs.progressBarOn || false;
var postViaAjax = configs.postViaAjax || false;
var preventScrolling = configs.preventScrolling || false;
var preventZooming = configs.preventZooming || false;
var messages = configs.messages || {};
var helpMessage = messages.insufficientPoints || "";
var holdMessage = messages.userTraining || "";
var postUrl = configs.postUrl || "/stampscreen";
var success = configs.success || {};
var error = configs.error || {};
var points = [];
var stampScreenElm = document.getElementById(stampScreenElmId);
var stampTouching = false;
var pointsMin = configs.insufficientPointsMin || 3;
var holdMsg;
complete = function () {
stampTouching = false;
}
if (preventScrolling) {
stampScreenElm.addEventListener('touchmove', function(event) {
// Prevent scrolling on this element
event.preventDefault();
});
}
if (preventZooming) {
stampScreenElm.addEventListener('gesturechange', function(event) {
// Disable browser zoom
event.preventDefault();
});
}
stampScreenElm.addEventListener('touchstart', function (event) {
$("#snowshoe-messages").empty();
clearTimeout(holdMsg);
if (event.touches.length >= pointsMin && progressAnimationOn) {
$('#snowshoe-progress-bar').addClass("snowshoe-progress-bar");
};
if (event.touches.length >= 5) {
var data = [];
var touches = event.touches;
for (var i = 0; i <= event.touches.length; i++) {
if (touches[i]) {
data.push([touches[i].pageX, touches[i].pageY]);
}
}
send(data, postViaAjax);
}
if (event.touches.length < 5 && event.touches.length >= pointsMin) {
$('#snowshoe-progress-bar').removeClass("snowshoe-progress-bar");
// Teach users to stamp and hold for 2 seconds before displaying user-defined message
if (helpMessage) {
$("#snowshoe-messages").append(holdMessage);
holdMsg = setTimeout(function () { displayCustomMessage(helpMessage) }, 2000);
}
}
});
function displayCustomMessage(helpMsg) {
$("#snowshoe-messages").children().replaceWith(helpMsg);
};
function send(points, postViaAjax) {
// return if already one process is working out
if (stampTouching) return false;
stampTouching = true;
if (postViaAjax) {
client.postAjax(points, postUrl, success, error, complete);
} else {
client.post(points, postUrl);
}
}
}
},
client: {
//
// Coupled to $.snowshoe.Base64
//
postAjax: function (data, endpoint, cbk, cbkError, cbkComplete) {
$.ajax({
'url': endpoint,
'data': "data=" + $.snowshoe.Base64.encode(JSON.stringify(data)),
'type': "POST",
'error': function (response) {
cbkComplete(response);
cbkError(response.responseJSON);
},
'success': function (response) {
cbkComplete(response);
cbk(response);
}
})
},
post: function (data, endpoint) {
var form = $('<form method="POST"></form>');
form.attr('action', endpoint);
var input = $('<input name="data" type="hidden"></input>');
input.val($.snowshoe.Base64.encode(JSON.stringify(data)));
form.append(input);
$('body').append(form);
form.submit();
}
},
Base64: {
//
// Base64 adapted from & courtesy of http://scotch.io
//
_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
encode: function (input) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = this._utf8_encode(input);
while (i < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
}
return output;
},
_utf8_encode: function (string) {
string = string.replace(/\r\n/g, "\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if ((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
}
}
}
})(jQuery);
$.snowshoe.stampScreen.init(stampScreenInitData, $.snowshoe.client);