AngularJS简单的签名板指令(无jQuery的) [英] AngularJS Simple Signature Pad Directive (without jQuery)
问题描述
随着计算器我得到了我一个简单的画布上签名指令的帮助。的问题是,它的工作原理与鼠标事件(鼠标按下,鼠标松开,鼠标移动),但不与触摸事件(touchstart,touchmove,touchend)工作。我有ngTouch在我的主要应用模块,并持有该指令在模块中。我希望你能帮助我。这里的code:
VAR SIG = angular.module('签名',['ngTouch']);sig.directive(mjav,['$文件',函数($文件){
返回{
限制:A,
链接:功能(范围,元素){
变种CTX =元素[0] .getContext('2D'); ctx.canvas.width = window.innerWidth - 20;
变种tempCanvas = document.createElement方法('nanavas'); //变量决定,如果事情应该在鼠标移动绘制
VAR绘图= FALSE; //当前运动前的最后一个坐标
VAR lastX;
VAR lastY; element.on('touchstart',函数(事件){
如果(event.offsetX!==未定义){
lastX = event.offsetX;
lastY = event.offsetY;
}其他{
lastX = event.layerX - event.currentTarget.offsetLeft;
lastY = event.layerY - event.currentTarget.offsetTop;
} //开始新行
ctx.beginPath(); 拉丝= TRUE;
});
element.on('touchmove',函数(事件){
如果(图){
//获取当前鼠标的位置
如果(event.offsetX!==未定义){
currentX = event.offsetX;
currentY = event.offsetY;
}其他{
currentX = event.layerX - event.currentTarget.offsetLeft;
currentY = event.layerY - event.currentTarget.offsetTop;
} 画(lastX,lastY,currentX,currentY); //设置当前坐标为持续一年
lastX = currentX;
lastY = currentY;
}
}); $ document.on('touchend',函数(事件){
//停止绘制
拉丝= FALSE;
}); //帆布复位
功能复位(){
元素[0] .WIDTH =元素[0] .WIDTH;
} 函数draw(LX,LY,CX,CY){
//从线
ctx.moveTo(LX,LY);
// 至
ctx.lineTo(CX,CY);
//颜色
ctx.strokeStyle =#000;
// 画出来
ctx.stroke();
}
}
};
}]);
如果有人需要AngularJS一个简单的签名指令这是我想出了中底:
VAR SIG = angular.module(签名,[]);sig.controller('signatureCtrl',['$范围',函数($范围){
$ scope.clearVal = 0;
$ scope.saveVal = 0; $ scope.clear =功能(){
$ scope.clearVal + = 1; //这个值变动指令清除上下文
} $ scope.saveToImage =功能(){
$ scope.saveVal = 1; //这个值变动指令保存签名
}
}]);sig.directive(signatureDir,['$文件','$日志,$ rootScope',函数($文件,$日志$ rootScope){
返回{
限制:A,
链接:功能(范围,元素,ATTRS){
变种CTX =元素[0] .getContext('2D'); ctx.canvas.width = window.innerWidth - 30; //当前运动前的最后一个坐标
VAR lastPt; 功能的getOffset(OBJ){
返回{左:15,最高:116}; //有一个固定偏移
} ATTRS。$观察(价值,功能(newValue)以{
ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height);
}); ATTRS。$观察(saveVal功能(为newValue,DNID){
变种的imageData = ctx.canvas.toDataURL();
$ rootScope.signatureTemp.push({'DNID':DNID,签名:为imageData});
}); element.on('touchstart',函数(E){
亦即preventDefault();
ctx.fillRect(e.touches [0] .pageX - 的getOffset(元件)。左,e.touches [0] .pageY - 的getOffset(元件).TOP,2,2);
lastPt = {X:e.touches [0] .pageX - 的getOffset(元)。左,Y:e.touches [0] .pageY - 的getOffset(元).TOP};
});
element.on('touchmove',函数(E){
亦即preventDefault();
如果(lastPt!= NULL){
ctx.beginPath();
ctx.moveTo(lastPt.x,lastPt.y);
ctx.lineTo(e.touches [0] .pageX - 的getOffset(元)。左,e.touches [0] .pageY - 的getOffset(元).TOP);
ctx.stroke();
}
lastPt = {X:e.touches [0] .pageX - 的getOffset(元)。左,Y:e.touches [0] .pageY - 的getOffset(元).TOP};
}); element.on('touchend',函数(E){
亦即preventDefault();
lastPt = NULL;
});
}
};
}]);
标记:
< DIV NG控制器=signatureCtrl>
< UL类=列表组>
< H3风格=填充左:均为15px;>签署及LT; / H3 GT&;
<李班=列表组项>
<帆布saveVal ={{saveVal}}VALUE ={{clearVal}}的风格=边界:1px的纯黑色; ID =canvas1宽度=200HEIGHT =200signatureDir>&下; /画布>
<按钮类=BTN BTN-警告NG点击=清除()>清除< /按钮>
<按钮类=BTN BTN-主要NG点击=OK()>保存< /按钮>
< /李>
< / UL>
< / DIV>
如果任何人都可以看到一些不好的code在这里请大家指正!
With the help of stackoverflow i got me a simple canvas signature directive. The problem is that it works with mouse events (mousedown, mouseup, mousemove) but is not working with touch events (touchstart,touchmove,touchend). I have ngTouch in my main app module and in the module that holds the directive. I hope you can help me. Here's the code:
var sig = angular.module('signature', ['ngTouch']);
sig.directive("mjav", ['$document', function ($document) {
return {
restrict: "A",
link: function (scope, element) {
var ctx = element[0].getContext('2d');
ctx.canvas.width = window.innerWidth - 20;
var tempCanvas = document.createElement('nanavas');
// variable that decides if something should be drawn on mousemove
var drawing = false;
// the last coordinates before the current move
var lastX;
var lastY;
element.on('touchstart', function (event) {
if (event.offsetX !== undefined) {
lastX = event.offsetX;
lastY = event.offsetY;
} else {
lastX = event.layerX - event.currentTarget.offsetLeft;
lastY = event.layerY - event.currentTarget.offsetTop;
}
// begins new line
ctx.beginPath();
drawing = true;
});
element.on('touchmove', function (event) {
if (drawing) {
// get current mouse position
if (event.offsetX !== undefined) {
currentX = event.offsetX;
currentY = event.offsetY;
} else {
currentX = event.layerX - event.currentTarget.offsetLeft;
currentY = event.layerY - event.currentTarget.offsetTop;
}
draw(lastX, lastY, currentX, currentY);
// set current coordinates to last one
lastX = currentX;
lastY = currentY;
}
});
$document.on('touchend', function (event) {
// stop drawing
drawing = false;
});
// canvas reset
function reset() {
element[0].width = element[0].width;
}
function draw(lX, lY, cX, cY) {
// line from
ctx.moveTo(lX, lY);
// to
ctx.lineTo(cX, cY);
// color
ctx.strokeStyle = "#000";
// draw it
ctx.stroke();
}
}
};
}]);
If someone will need a simple signature directive for AngularJS this is what I came up with in the end:
var sig = angular.module('signature', []);
sig.controller('signatureCtrl', ['$scope', function ($scope) {
$scope.clearVal = 0;
$scope.saveVal = 0;
$scope.clear = function () {
$scope.clearVal += 1; //On this value change directive clears the context
}
$scope.saveToImage = function () {
$scope.saveVal = 1; //On this value change directive saves the signature
}
}]);
sig.directive("signatureDir", ['$document', '$log', '$rootScope', function ($document, $log, $rootScope) {
return {
restrict: "A",
link: function (scope, element, attrs) {
var ctx = element[0].getContext('2d');
ctx.canvas.width = window.innerWidth - 30;
// the last coordinates before the current move
var lastPt;
function getOffset(obj) {
return { left: 15, top: 116 }; //Got a fixed offset
}
attrs.$observe("value", function (newValue) {
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
});
attrs.$observe("saveVal", function (newValue, dnid) {
var imagedata = ctx.canvas.toDataURL();
$rootScope.signatureTemp.push({'dnid':dnid, 'signature':imagedata});
});
element.on('touchstart', function (e) {
e.preventDefault();
ctx.fillRect(e.touches[0].pageX - getOffset(element).left, e.touches[0].pageY - getOffset(element).top, 2, 2);
lastPt = { x: e.touches[0].pageX - getOffset(element).left, y: e.touches[0].pageY - getOffset(element).top };
});
element.on('touchmove', function (e) {
e.preventDefault();
if (lastPt != null) {
ctx.beginPath();
ctx.moveTo(lastPt.x, lastPt.y);
ctx.lineTo(e.touches[0].pageX - getOffset(element).left, e.touches[0].pageY - getOffset(element).top);
ctx.stroke();
}
lastPt = { x: e.touches[0].pageX - getOffset(element).left, y: e.touches[0].pageY - getOffset(element).top };
});
element.on('touchend', function (e) {
e.preventDefault();
lastPt = null;
});
}
};
}]);
Markup:
<div ng-controller="signatureCtrl">
<ul class="list-group">
<h3 style="padding-left: 15px;">Signature</h3>
<li class="list-group-item">
<canvas saveVal="{{ saveVal }}" value="{{ clearVal }}" style="border: 1px solid black;" id="canvas1" width="200" height="200" signatureDir></canvas>
<button class="btn btn-warning" ng-click="clear()">Clear</button>
<button class="btn btn-primary" ng-click="ok()">Save</button>
</li>
</ul>
</div>
If anyone can see some bad code in here please correct me!
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