用仿ActionScript的语法来编写html5——第六篇，TextField与输入框

来源：互联网发布：树莓派3 ubuntu 编辑：程序博客网时间：2024/05/18 03:56

用仿ActionScript的语法来编写html5——第六篇，TextField与输入框

一，对比
1,html5中
首先看看在html5的canvas中的文字显示

var canvas = document.getElementById("myCanvas");  var context = canvas.getContext("2d");  context.font = "40pt Calibri";  context.fillStyle = "#0000ff";context.fillText("文字测试!", 50, 150);

在html中输入框就不用说了，需要用到input标签

<input type="text" id="myTextbox" />

2,在as中

//文字显示var txt:TextField = new TextField();txt.text = "文字测试!";txt.x = 50;txt.y = 50;addChild(txt);//输入框var txt:TextField = new TextField();txt.type = TextFieldType.INPUT;txt.x = 50;txt.y = 50;addChild(txt);

二,编写js类库后的代码

//文字显示var txt = new LTextField();txt.x = 100;txt.text = "TextField 测试";addChild(txt);//输入框var txt1 = new LTextField();txt1.x = 100;txt1.y = 50;txt1.setType(LTextFieldType.INPUT);addChild(txt1);

三,实现方法
文字显示非常简单，只需要建立一个LTextField类和一个show方法就可以了function LTextField(){

var self = this;self.objectindex = ++LGlobal.objectIndex;self.type = "LTextField";self.texttype = null;self.x = 0;self.y = 0;self.text = "";self.font = "utf-8";self.size = "11";self.color = "#000000";self.textAlign = "left";self.textBaseline = "middle";self.lineWidth = 1;self.stroke = false;self.visible=true;}LTextField.prototype = {show:function (cood){if(cood==null)cood={x:0,y:0};var self = this;if(!self.visible)return;    LGlobal.canvas.font = self.size+"pt "+self.font;      LGlobal.canvas.textAlign = self.textAlign;    LGlobal.canvas.textBaseline = self.textBaseline;    LGlobal.canvas.lineWidth = self.lineWidth;      if(self.stroke){    LGlobal.canvas.strokeStyle = self.color;    LGlobal.canvas.strokeText(self.text,parseFloat(cood.x) + parseFloat(self.x),    parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));      }else{    LGlobal.canvas.fillStyle = self.color;    LGlobal.canvas.fillText(self.text,parseFloat(cood.x) + parseFloat(self.x),    parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));    }}}

代码不难理解，就是调用show方法的时候，把它画在canvas上面而已，
关键是输入框，因为html中，输入框是一个标签，怎么把这个标签画到canvas上？或者说canvas可以直接现实输入框？
这个我不太清楚，如果有高手知道的话，希望能告诉偶一声，
我现在说一说我的做法，我是在textField是input的时候，先画一个矩形方框，然后利用div，把textbox直接显示在相应的位置上
我的html里一开始只有下面代码

<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>仿ActionScript测试-TextField</title><script type="text/javascript" src="../legend/legend.js"></script> <script type="text/javascript" src="./js/Main.js"></script> </head><body><div id="mylegend">页面读取中……</div></body></html>

然后，利用javascript写入一个canvas和一个textbox，作为准备工作

LGlobal.object = document.getElementById(id);LGlobal.object.innerHTML='<div id="' + LGlobal.id + '_inittxt" style="position:absolute;margin:0px 0px 0px 0px;width:'+width+'px;height:'+height+'px;">数据读取中……</div>' + '<div style="position:absolute;margin:0px 0px 0px 0px;z-index:0;"><canvas id="' + LGlobal.id + '_canvas">您的浏览器不支持HTML5</canvas></div>'+'<div id="' + LGlobal.id + '_InputText" style="position:absolute;margin:0px 0px 0px 0px;z-index:10;display:none;"><input type="text" id="' + LGlobal.id + '_InputTextBox" /></div>';LGlobal.canvasObj = document.getElementById(LGlobal.id+"_canvas");LGlobal.inputBox = document.getElementById(LGlobal.id + '_InputText');LGlobal.inputTextBox = document.getElementById(LGlobal.id + '_InputTextBox');LGlobal.inputTextField = null;

一开始将textbox隐藏，然后的做法是，当点击我画的矩形方框的时候，将它显示到矩形方框上面，然后当点击其他地方的时候，把输入的内容赋值给textField后隐藏textbox
具体做法不多说了，下面是完整的LTextField代码，或者你一会儿可以直接鼠标右健看完整代码function LTextField(){

var self = this;self.objectindex = ++LGlobal.objectIndex;self.type = "LTextField";self.texttype = null;self.x = 0;self.y = 0;self.text = "";self.font = "utf-8";self.size = "11";self.color = "#000000";self.textAlign = "left";self.textBaseline = "middle";self.lineWidth = 1;self.stroke = false;self.visible=true;}LTextField.prototype = {show:function (cood){if(cood==null)cood={x:0,y:0};var self = this;if(!self.visible)return;if(self.texttype == LTextFieldType.INPUT){self.inputBackLayer.show({x:self.x+cood.x,y:self.y+cood.y});    if(LGlobal.inputBox.name == "input"+self.objectindex){    LGlobal.inputBox.style.marginTop = (self.y+cood.y) + "px";    LGlobal.inputBox.style.marginLeft = (self.x+cood.x) + "px";    }}    LGlobal.canvas.font = self.size+"pt "+self.font;      LGlobal.canvas.textAlign = self.textAlign;    LGlobal.canvas.textBaseline = self.textBaseline;    LGlobal.canvas.lineWidth = self.lineWidth;      if(self.stroke){    LGlobal.canvas.strokeStyle = self.color;    LGlobal.canvas.strokeText(self.text,parseFloat(cood.x) + parseFloat(self.x),    parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));      }else{    LGlobal.canvas.fillStyle = self.color;    LGlobal.canvas.fillText(self.text,parseFloat(cood.x) + parseFloat(self.x),    parseFloat(cood.y) + parseFloat(self.y) + parseFloat(self.size));    }},setType:function(type){var self = this;if(self.texttype != type && type == LTextFieldType.INPUT){self.inputBackLayer = new LSprite();self.inputBackLayer.graphics.drawRect(1,"black",[0, 0, 150, 20],true,"#cccccc");self.inputBackLayer.addEventListener(LMouseEvent.MOUSE_DOWN, function(){if(self.texttype != LTextFieldType.INPUT)return;LGlobal.inputBox.style.display = "";LGlobal.inputBox.name = "input"+self.objectindex;    LGlobal.inputTextField = self;    LGlobal.inputTextBox.value = self.text;});}else{self.inputBackLayer = null;}self.texttype = type;},mouseEvent:function (event,type,cood){if(cood==null)cood={x:0,y:0};var self = this;if(self.inputBackLayer == null)return;self.inputBackLayer.mouseEvent(event,type,{x:self.x+cood.x,y:self.y+cood.y});}}

看一下成果吧,看不到效果的请下载支持html5的浏览器
http://fsanguo.comoj.com/html5/jstoas05/index.html
点击输入框，textbox会自动显示，输入后点击其他地方，textbox自动消失

该系列的其他文章

用仿ActionScript的语法来编写html5——第一篇，显示一张图片
http://blog.csdn.net/lufy_legend/article/details/6753032
用仿ActionScript的语法来编写html5——第二篇，利用Sprite来实现动画
http://blog.csdn.net/lufy_legend/article/details/6760812
用仿ActionScript的语法来编写html5——第三篇，鼠标事件与游戏人物移动
http://blog.csdn.net/lufy_legend/article/details/6770713
用仿ActionScript的语法来编写html5——第四篇，继承与简单的rpg
http://blog.csdn.net/lufy_legend/article/details/6771962
用仿ActionScript的语法来编写html5——第五篇，Graphics绘图
http://blog.csdn.net/lufy_legend/article/details/6777784