用仿ActionScript的语法来编写html5——第六篇，TextField与输入框
用仿ActionScript的语法来编写html5——第一篇，
用仿ActionScript的语法来编写html5——第二篇，利用Sprite来实现动画
用仿ActionScript的语法来编写html5——第三篇，鼠标事件与游戏人物移动
用仿ActionScript的语法来编写html5——第四篇，继承与简单的rpg
用仿ActionScript的语法来编写html5——第五篇，Graphics绘图
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
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
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='
'
'+'
';
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});
}
}
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
摘自 lufy小屋
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