https://codepen.io/rongxike/pen/MJMopq
您可以将它与弹出式签名板一起使用。如果你得到你想要的，我很高兴。
var sign = $('#txt').SignaturePad({
allowToSign: true,
img64: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7',
border: '1px solid #c7c8c9',
width: '300px',
height: '150px',
callback: function (data, action) {
console.log(data);
}
});
var sign = $('#txt2').SignaturePad({
allowToSign: true,
img64: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7',
border: '1px solid #c7c8c9',
width: '300px',
height: '150px',
callback: function (data, action) {
console.log(data);
}
});
(function () {
var __slice = [].slice;
(function ($) {
var Sketch;
$.fn.sketch = function () {
var args, key, sketch;
key = arguments[0], args = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
if (this.length > 1) {
$.error('Sketch.js can only be called on one element at a time.');
}
sketch = this.data('sketch');
if (typeof key === 'string' && sketch) {
if (sketch[key]) {
if (typeof sketch[key] === 'function') {
return sketch[key].apply(sketch, args);
} else if (args.length === 0) {
return sketch[key];
} else if (args.length === 1) {
return sketch[key] = args[0];
}
} else {
return $.error('Sketch.js did not recognize the given command.');
}
} else if (sketch) {
return sketch;
} else {
this.data('sketch', new Sketch(this.get(0), key));
return this;
}
};
Sketch = (function () {
function Sketch(el, opts) {
this.el = el;
this.canvas = $(el);
this.context = el.getContext('2d');
this.options = $.extend({
toolLinks: true,
defaultTool: 'marker',
defaultColor: '#000000',
defaultSize: 2
}, opts);
this.painting = false;
this.color = this.options.defaultColor;
this.size = this.options.defaultSize;
this.tool = this.options.defaultTool;
this.actions = [];
this.action = [];
this.canvas.bind('click mousedown mouseup mousemove mouseleave mouseout touchstart touchmove touchend touchcancel', this.onEvent);
if (this.options.toolLinks) {
$('body').delegate("a[href=\"#" + (this.canvas.attr('id')) + "\"]", 'click', function (e) {
var $canvas, $this, key, sketch, _i, _len, _ref;
$this = $(this);
$canvas = $($this.attr('href'));
sketch = $canvas.data('sketch');
_ref = ['color', 'size', 'tool'];
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
key = _ref[_i];
if ($this.attr("data-" + key)) {
sketch.set(key, $(this).attr("data-" + key));
}
}
if ($(this).attr('data-download')) {
sketch.download($(this).attr('data-download'));
}
return false;
});
}
}
Sketch.prototype.download = function (format) {
var mime;
format || (format = "png");
if (format === "jpg") {
format = "jpeg";
}
mime = "image/" + format;
return window.open(this.el.toDataURL(mime));
};
Sketch.prototype.set = function (key, value) {
this[key] = value;
return this.canvas.trigger("sketch.change" + key, value);
};
Sketch.prototype.startPainting = function () {
this.painting = true;
return this.action = {
tool: this.tool,
color: this.color,
size: parseFloat(this.size),
events: []
};
};
Sketch.prototype.stopPainting = function () {
if (this.action) {
this.actions.push(this.action);
}
this.painting = false;
this.action = null;
return this.redraw();
};
Sketch.prototype.onEvent = function (e) {
if (e.originalEvent && e.originalEvent.targetTouches) {
e.pageX = e.originalEvent.targetTouches[0].pageX;
e.pageY = e.originalEvent.targetTouches[0].pageY;
}
$.sketch.tools[$(this).data('sketch').tool].onEvent.call($(this).data('sketch'), e);
e.preventDefault();
return false;
};
Sketch.prototype.redraw = function () {
var sketch;
//this.el.width = this.canvas.width();
this.context = this.el.getContext('2d');
sketch = this;
$.each(this.actions, function () {
if (this.tool) {
return $.sketch.tools[this.tool].draw.call(sketch, this);
}
});
if (this.painting && this.action) {
return $.sketch.tools[this.action.tool].draw.call(sketch, this.action);
}
};
return Sketch;
})();
$.sketch = {
tools: {}
};
$.sketch.tools.marker = {
onEvent: function (e) {
switch (e.type) {
case 'mousedown':
case 'touchstart':
if (this.painting) {
this.stopPainting();
}
this.startPainting();
break;
case 'mouseup':
//return this.context.globalCompositeOperation = oldcomposite;
case 'mouseout':
case 'mouseleave':
case 'touchend':
//this.stopPainting();
case 'touchcancel':
this.stopPainting();
}
if (this.painting) {
this.action.events.push({
x: e.pageX - this.canvas.offset().left,
y: e.pageY - this.canvas.offset().top,
event: e.type
});
return this.redraw();
}
},
draw: function (action) {
var event, previous, _i, _len, _ref;
this.context.lineJoin = "round";
this.context.lineCap = "round";
this.context.beginPath();
this.context.moveTo(action.events[0].x, action.events[0].y);
_ref = action.events;
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
event = _ref[_i];
this.context.lineTo(event.x, event.y);
previous = event;
}
this.context.strokeStyle = action.color;
this.context.lineWidth = action.size;
return this.context.stroke();
}
};
return $.sketch.tools.eraser = {
onEvent: function (e) {
return $.sketch.tools.marker.onEvent.call(this, e);
},
draw: function (action) {
var oldcomposite;
oldcomposite = this.context.globalCompositeOperation;
this.context.globalCompositeOperation = "destination-out";
action.color = "rgba(0,0,0,1)";
$.sketch.tools.marker.draw.call(this, action);
return this.context.globalCompositeOperation = oldcomposite;
}
};
})(jQuery);
}).call(this);
(function ($) {
$.fn.SignaturePad = function (options) {
//update the settings
var settings = $.extend({
allowToSign: true,
img64: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7',
border: '1px solid #c7c8c9',
width: '300px',
height: '150px',
callback: function () {
return true;
}
}, options);
//control should be a textbox
//loop all the controls
var id = 0;
//add a very big pad
var big_pad = $('#signPadBig');
var back_drop = $('#signPadBigBackDrop');
var canvas = undefined;
if (big_pad.length == 0) {
back_drop = $('<div>')
back_drop.css('position', 'fixed');
back_drop.css('top', '0');
back_drop.css('right', '0');
back_drop.css('bottom', '0');
back_drop.css('left', '0');
back_drop.css('z-index', '1040 !important');
back_drop.css('background-color', '#000');
back_drop.css('display', 'none');
back_drop.css('filter', 'alpha(opacity=50)');
back_drop.css('opacity', '0.5');
$('body').append(back_drop);
big_pad = $('<div>');
big_pad.css('display', 'none');
big_pad.css('position', 'fixed');
big_pad.css('margin', '0 auto');
big_pad.css('top', '0');
big_pad.css('bottom', '0');
big_pad.css('right', '0');
big_pad.css('left', '0');
big_pad.css('z-index', '1000002 !important');
big_pad.css('overflow', 'hidden');
big_pad.css('outline', '0');
big_pad.css('-webkit-overflow-scrolling', 'touch');
big_pad.css('right', '0');
big_pad.css('border', '1px solid #c8c8c8');
big_pad.css('padding', '15px');
big_pad.css('background-color', 'white');
big_pad.css('margin-top', '15px');
big_pad.css('width', '95%');
big_pad.css('height', '90%');
big_pad.css('border-radius', '10px');
big_pad.attr('id', 'signPadBig');
$('body').append(big_pad);
var update_canvas_size = function () {
var w = big_pad.width() //* 0.95;
var h = big_pad.height() - 55;
canvas.attr('width', w);
canvas.attr('height', h);
}
canvas = $('<canvas>');
canvas.css('display', 'block');
canvas.css('margin', '0 auto');
canvas.css('border', '1px solid #c8c8c8');
canvas.css('border-radius', '10px');
//canvas.css('width', '90%');
//canvas.css('height', '80%');
big_pad.append(canvas);
update_canvas_size();
$(window).on('resize', function () {
update_canvas_size();
});
var clearCanvas = function () {
canvas.sketch().action = null;
canvas.sketch().actions = []; // this line empties the actions.
var ctx = canvas[0].getContext("2d");
ctx.clearRect(0, 0, canvas[0].width, canvas[0].height);
return true
}
var _get_base64_value = function () {
var text_control = $.data(big_pad[0], 'control'); //settings.control; // $('#' + big_pad.attr('id'));
return $(text_control).val();
}
var copyCanvas = function () {
//get data from bigger pad
var sigData = canvas[0].toDataURL("image/png");
var _img = new Image;
_img.onload = resizeImage;
_img.src = sigData;
var targetWidth = canvas.width();
var targetHeight = canvas.height();
function resizeImage() {
var imageToDataUri = function (img, width, height) {
// create an off-screen canvas
var canvas = document.createElement('canvas'),
ctx = canvas.getContext('2d');
// set its dimension to target size
canvas.width = width;
canvas.height = height;
// draw source image into the off-screen canvas:
ctx.drawImage(img, 0, 0, width, height);
// encode image to data-uri with base64 version of compressed image
return canvas.toDataURL();
}
var newDataUri = imageToDataUri(this, targetWidth, targetHeight);
var control_img = $.data(big_pad[0], 'img');
if (control_img)
$(control_img).attr("src", newDataUri);
var text_control = $.data(big_pad[0], 'control'); //settings.control; // $('#' + big_pad.attr('id'));
if (text_control)
$(text_control).val(newDataUri);
}
}
var buttons = [
{
title: 'Close',
callback: function () {
clearCanvas();
big_pad.slideToggle(function () {
back_drop.hide('fade');
});
}
},
{
title: 'Clear',
callback: function () {
clearCanvas();
if (settings.callback)
settings.callback(_get_base64_value(), 'clear');
}
},
{
title: 'Accept',
callback: function () {
copyCanvas();
clearCanvas();
big_pad.slideToggle(function () {
back_drop.hide('fade', function () {
if (settings.callback)
settings.callback(_get_base64_value(), 'accept');
});
});
}
}].forEach(function (e) {
var btn = $('<button>');
btn.attr('type', 'button');
btn.css('border', '1px solid #c8c8c8');
btn.css('background-color', 'white');
btn.css('padding', '10px');
btn.css('display', 'block');
btn.css('margin-top', '15px');
btn.css('margin-right', '5px');
btn.css('cursor', 'pointer');
btn.css('border-radius', '5px');
btn.css('float', 'right');
btn.css('height', '40px');
btn.text(e.title);
btn.on('click', function () {
e.callback(e.title);
})
big_pad.append(btn);
});
}
else {
canvas = big_pad.find('canvas')[0];
}
//init the signpad
if (canvas) {
var sign1big = $(canvas).sketch({ defaultColor: "#000", defaultSize: 5 });
}
//for each control
return this.each(function () {
var control = $(this);
control.hide();
//get the control parent
var wrapper = control.parent();
var img = $('<img>');
//style it
img.css("cursor", "pointer");
img.css("border", settings.border);
img.css("height", settings.height);
img.css("width", settings.width);
img.css('border-radius', '5px')
img.attr("src", settings.img64);
if (typeof (wrapper) == 'object') {
wrapper.append(img);
}
//init the big sign pad
if (settings.allowToSign == true) {
//click to the pad bigger
img.on('click', function () {
//show the pad
back_drop.show();
big_pad.slideToggle();
//save control to use later
$.data(big_pad[0], 'img', img);
$.data(big_pad[0], 'control', control);
//settings.control = control;
//settings.img = img;
});
}
});
};
})(jQuery);