对于作业，我们需要制作恒温应用程序。我和我的团队希望在离子框架中做到这一点。在一些帮助下，我已经能够获得api.js，我们获得了离子到某种程度的工作。但是现在我遇到了一个我不知道如何解决的错误。
这是新的API.ts：
import * as $ from 'jquery';
//import * as http from '@angular/http';
export class API {
ServerUrl = '';
Type = {
Day: 'day',
Night: 'night'
};
Days = {
Monday: 'Monday',
Tuesday: 'Tuesday',
Wednesday: 'Wednesday',
Thursday: 'Thursday',
Friday: 'Friday',
Saturday: 'Saturday',
Sunday: 'Sunday'
};
MinTemperature = parseFloat('5.0');
MaxTemperature = parseFloat('30.0');
MaxSwitches = 5;
Time;
CurrentDay;
DayTemperature;
NightTemperature;
CurrentTemperature;
TargetTemperature;
ProgramState;
Program:any = {};
constructor() {
this.Program[this.Days.Monday] = [];
this.Program[this.Days.Tuesday] = [];
this.Program[this.Days.Wednesday] = [];
this.Program[this.Days.Thursday] = [];
this.Program[this.Days.Friday] = [];
this.Program[this.Days.Saturday] = [];
this.Program[this.Days.Sunday] = [];
}
/* Retrieve day program
*/
getProgram(day) {
return this.Program[day];
}
/* Sorts the heating periods (the periods when the heating is on) and merges overlapping ones
*/
sortMergeProgram(day) {
let program = this.getProgram(day);
program.sort(function(a, b) {
return this.parseTime(a[0]) - this.parseTime(b[0])
});
for (let i = 0; i < program.length - 1; i++) {
if (this.parseTime(program[i][1]) >= this.parseTime(program[i + 1][0])) {
let start = (program[i][0]);
let end = (this.parseTime(program[i][1]) > this.parseTime(program[i + 1][1])) ? program[i][1] : program[i + 1][1];
program.splice(i, 2);
program.push([start, end]);
this.sortMergeProgram(day);
break;
}
}
}
/* Retrieves all data from the server except for weekProgram
*/
get(attribute_name) {
return this.requestData(
"/" + attribute_name,
function(data) {
return $(data).text();
}
);
}
/* Retrieves the week program
*/
getWeekProgram() {
return this.requestData(
'/weekProgram',
function(data) {
$(data).find('day').each(function() {
let day = (<any>$(this)).attr('name');
this.Program[day] = [];
$(this).find('switch').each(function() {
if ((<any>$(this)).attr('state') == 'on') {
if ((<any>$(this)).attr('type') == this.Type.Day) {
this.getProgram(day).push([$(this).text(), '00:00']);
} else {
this.getProgram(day)[this.getProgram(day).length - 1][1] = $(this).text();
}
}
})
});
return this.Program;
}
);
}
/* Uploads all data to the server except for currentTemperature and weekProgram
*/
put(attribute_name, xml_tag, value) {
this.uploadData("/" + attribute_name, "<" + xml_tag + ">" + value + "</" + xml_tag + ">");
}
requestData(address, func) {
let result;
(<any>$).ajax({
type: "get",
url: this.ServerUrl + address,
dataType: "xml",
async: false,
success: function(data) {
result = func(data);
}
});
return result;
}
/* Uploads the week program
*/
setWeekProgram() {
let doc = document.implementation.createDocument(null, null, null);
let program = doc.createElement('week_program');
program.setAttribute('state', this.ProgramState ? 'on' : 'off');
for (let key in this.Program) {
let day = doc.createElement('day');
day.setAttribute('name', key);
let daySwitches = [];
let nightSwitches = [];
let i, text, sw;
let periods = this.getProgram(key);
for (i = 0; i < periods.length; i++) {
daySwitches.push(periods[i][0]);
nightSwitches.push(periods[i][1]);
}
for (i = 0; i < this.MaxSwitches; i++) {
sw = doc.createElement('switch');
sw.setAttribute('type', this.Type.Day);
if (i < daySwitches.length) {
sw.setAttribute('state', 'on');
text = doc.createTextNode(daySwitches[i]);
} else {
sw.setAttribute('state', 'off');
text = doc.createTextNode('00:00');
}
sw.appendChild(text);
day.appendChild(sw);
}
for (i = 0; i < this.MaxSwitches; i++) {
sw = doc.createElement('switch');
sw.setAttribute('type', this.Type.Night);
if (i < nightSwitches.length) {
sw.setAttribute('state', 'on');
text = doc.createTextNode(nightSwitches[i]);
} else {
sw.setAttribute('state', 'off');
text = doc.createTextNode('00:00');
}
sw.appendChild(text);
day.appendChild(sw);
}
program.appendChild(day);
}
doc.appendChild(program);
this.uploadData('/weekProgram', (new XMLSerializer()).serializeToString(doc));
}
/* Creates the default week program
*/
setDefault() {
let doc = document.implementation.createDocument(null, null, null);
let program = doc.createElement('week_program');
program.setAttribute('state', this.ProgramState ? 'on' : 'off');
for (let key in this.Program) {
let day = doc.createElement('day');
day.setAttribute('name', key);
let daySwitches = [];
let nightSwitches = [];
let i, text, sw;
for (i = 0; i < this.MaxSwitches; i++) {
sw = doc.createElement('switch');
sw.setAttribute('type', this.Type.Night);
sw.setAttribute('state', 'off');
text = doc.createTextNode('00:00');
sw.appendChild(text);
day.appendChild(sw);
}
for (i = 0; i < this.MaxSwitches; i++) {
sw = doc.createElement('switch');
sw.setAttribute('type', this.Type.Day);
sw.setAttribute('state', 'off');
text = doc.createTextNode('00:00');
sw.appendChild(text);
day.appendChild(sw);
}
program.appendChild(day);
}
doc.appendChild(program);
this.uploadData('/weekProgram', (new XMLSerializer()).serializeToString(doc));
}
uploadData(address, xml) {
(<any>$).ajax({
type: "put",
url: this.ServerUrl + address,
contentType: 'application/xml',
data: xml,
async: false
});
}
parseTime(t) {
return parseFloat(t.substr(0, 2)) + parseFloat(t.substr(3, 2)) / 60;
}
/* Adds a heating period for a specific day
*/
addPeriod(day, start, end) {
let program = this.getWeekProgram()[day];
program.push([start, end]);
this.sortMergeProgram(day);
this.setWeekProgram();
}
/* Removes a heating period from a specific day.
idx is the idex of the period with values from 0 to 4
*/
removePeriod(day, idx) {
let program = this.getWeekProgram()[day];
let start = program[idx][0];
let end = program[idx][1];
program.splice(idx, 1);
this.setWeekProgram();
}
/* Checks whether the temperature is within the range [5.0,30.0]
*/
inTemperatureBoundaries(temp) {
temp = parseFloat(temp);
return (temp >= this.MinTemperature && temp <= this.MaxTemperature);
}
}
我遇到问题的函数是getWeekProgram()，它正在从提供的服务器中检索weekProgram。但是这个服务器正在发送XML响应（无法获取JSON ......），当行this.Program[day] = []运行时，我收到以下错误：Runtime Error, this.Program[day] is undefined。我不知道如何解决这个错误..我已经尝试删除该行，并尝试将程序变成一个大数组而不是一个对象，但没有任何工作可悲; /。
这是我们正在使用的XML数据：
<week_program state="off">
<day name="Monday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
<day name="Tuesday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
<day name="Wednesday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
<day name="Thursday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
<day name="Friday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
<day name="Saturday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
<day name="Sunday">
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="night" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
<switch type="day" state="off">00:00</switch>
</day>
</week_program>
答案 0 :(得分：0)
内部函数内的各种this引用不引用类实例。当使用this语法声明函数时，当前function(){...}不会进入函数;为此，您需要使用以下语法：()=>{...}。您可以详细了解this的行为in the TypeScript wiki。
但是，在您的情况下，您不希望使用()=>{...}语法，因为您依赖this来引用.each正在处理的项目。因此，您需要在外部手动将类实例this保存在另一个变量中。这些变量的通用名称是self：
getWeekProgram() {
let self = this;
return this.requestData(
'/weekProgram',
function(data) {
$(data).find('day').each(function() {
let day = (<any>$(this)).attr('name');
self.Program[day] = [];
$(this).find('switch').each(function() {
if ((<any>$(this)).attr('state') == 'on') {
if ((<any>$(this)).attr('type') == self.Type.Day) {
self.getProgram(day).push([$(this).text(), '00:00']);
} else {
self.getProgram(day)[self.getProgram(day).length - 1][1] = $(this).text();
}
}
})
});
return self.Program;
}
);
}