[英]javascript object field set input value [object Object] instead of float
[英]set value of field from internal object javascript
我有一个叫做light的类,它通过ajax加载其状态:
function Light(name, channel, type, state) {
this.name = name;
this.channel;
this.type=type;
this.state = state; //0=off 1=on
this.turnOn = function () {
this.state = 1;
$('#luce-' + name).attr('src', controlImagePath + '' + type + '100.png');
}
this.turnOff = function () {
this.state = 0;
$('#luce-' + name).attr('src', controlImagePath + '' + type + '00.png');
}
this.toggle = function () {
if (this.state == 0) this.turnOn();
else this.turnOff();
}
this.checkState = function () {
var result;
$.jsonp({
callback: "callback",
url: 'http://' + serverAddress + ':' + serverPort + '/GetChannelValueAsJsonp?channelName=' + channel + '&callback=?',
success: function (data) {
if (data > 0) {
this.turnOn();
} else {
this.turnOff();
}
},
error: function (xOptions, textStatus) {
console.log("error");
}
});
}
}
它不断给出错误:
Uncaught TypeError: Object #<Object> has no method 'turnOn'
我怀疑这是因为成功功能超越了Light范围。 如何从另一个功能范围引用对象?
我会用Java的IE浏览器执行Light.this.turnOn()...如何使用javascript?
谢谢!
XHR回调函数中的this
引用jQuery / XHR对象。 您必须将this
关键字保存在变量中:
this.checkState = function () {
var result;
var $this = this; //Saving `this`
$.jsonp({
callback: "callback",
url: 'http://' + serverAddress + ':' + serverPort + '/GetChannelValueAsJsonp?channelName=' + channel + '&callback=?',
success: function (data) {
if (data > 0) {
$this.turnOn(); //Referring to `this` through $this`
} else {
$this.turnOff();
}
},
error: function (xOptions, textStatus) {
console.log("error");
}
});
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.