我正在尝试将JSON数据显示在段落中,但在不同日期拍摄的数据之间有一个分隔符。
function getAllLogs(emId) {
$.getJSON('datafile.json', function(data) {
$("#" + emId).html("All logs:<br>");
var firstDateDisplayed = false;
$.each(data, function(index, value) {
//Only displays dates once, then all log sheets for that date
if (firstDateDisplayed === false ||
data[index-1].log_sheet.time !== value.log_sheet.time) {
$("#" + emId).append("<br>----------------<br>");
//Formats and appends date to a paragraph
getLogDate(emId, index);
firstDateDisplayed = true;
}
//Formats and appends time to a paragraph
getLogTime(emId, index);
//Formats and appends all data to a paragraph
getLogData(emId, index);
});
});
}
我想要的是什么:
All logs:
----------------
Date 1
Time 1
Data 1
Time 2
Data 2
Time 3
Data 3
----------------
Date 2
Time 4
Data 4
Time 5
Data 5
我得到了什么:
----------------
----------------
Date 1
Time 1
Data 1
Time 2
Data 2
Time 3
Data 3
Date 2
Time 4
Data 4
Time 5
Data 5
示例JSON数据:
[
{
"log_sheet": {
"data":"4",
"date":"2012-07-27T00:00:00-06:00",
"time":"2000-01-01T02:15:00Z",
"more_data":"7"
}
},
{
"log_sheet": {
"data":"8,
"date":"2012-07-27T00:00:00-06:00",
"time":"2000-01-01T07:30:00Z",
"more_data":"3"
}
}
]
我该如何解决这个问题?我的日期显示正确,但为什么不分隔?
getLogTime函数:
//Gets, formats and displays the time for the current log sheet in the
//header of a collapsible menu or paragraph
function getLogTime(emId, logNum) {
//Accesses the JSON file
$.getJSON('datafile.json', function(data) {
//Takes only the part of the string that corresponds to time
var time = data[logNum].log_sheet.measured_at_time.substring(11,16);
//Formats time to 12 hour clock according to the hour
switch (time.substring(0, 2))
{
case "00":
//Changes 00 to 12 and adds am
time = time.replace(/00/, "12") + " am";
break;
case "01":
case "02":
case "03":
case "04":
case "05":
case "06":
case "07":
case "08":
case "09":
//Removes extra 0 and adds am
time = time.replace(/0/, "") + " am";
break;
case "10":
case "11":
//Adds am
time += " am";
break;
case "12":
//Adds pm
time += " pm";
break;
case "13":
//Replaces 13 with 1 and adds pm
time = time.replace(/13/, "1") + " pm"
case "14":
//Replaces 14 with 2 and adds pm
time = time.replace(/14/, "2") + " pm";
break;
case "15":
//Replaces 15 with 3 and adds pm
time = time.replace(/15/, "3") + " pm";
break;
case "16":
//Replaces 16 with 4 and adds pm
time = time.replace(/16/, "4") + " pm";
break;
case "17":
//Replaces 17 with 5 and adds pm
time = time.replace(/17/, "5") + " pm";
break;
case "18":
//Replaces 18 with 6 and adds pm
time = time.replace(/18/, "6") + " pm";
break;
case "19":
//Replaces 19 with 7 and adds pm
time = time.replace(/19/, "7") + " pm";
break;
case "20":
//Replaces 20 with 8 and adds pm
time = time.replace(/20/, "8") + " pm";
break;
case "21":
//Replaces 21 with 9 and adds pm
time = time.replace(/21/, "9") + " pm";
break;
case "22":
//Replaces 22 with 10 and adds pm
time = time.replace(/22/, "10") + " pm";
break;
case "23":
//Replaces 23 with 11 and adds pm
time = time.replace(/23/, "11") + " pm";
break;
}
//Uses only a portion of the string to accommodate possible future
//numbers
if (emId.substring(0,4) === "time") {
//Sets text in header to time
$("#" + emId + " .ui-btn-text").html(time);
} else {
//For displaying all of the logs
$("#" + emId).append(time + "<br>");
}
});
}
答案 0 :(得分:1)
所以基本上你要做的就是输出----当有新的日期出现时?
var json = [
{
"log_sheet": {
"data":"4",
"date":"2012-07-27T00:00:00-06:00",
"time":"2000-01-01T02:15:00Z",
"more_data":"7"
}
},
{
"log_sheet": {
"data":"4",
"date":"2012-07-27T00:00:00-06:00",
"time":"2000-01-01T02:15:00Z",
"more_data":"7"
}
},
{
"log_sheet": {
"data":"4",
"date":"2012-07-27T00:00:00-06:00",
"time":"2000-01-01T02:15:00Z",
"more_data":"7"
}
},
{
"log_sheet": {
"data":"4",
"date":"2012-07-27T00:00:00-06:00",
"time":"2000-01-01T02:17:00Z",
"more_data":"7"
}
}
];
console.log("All logs:");
$.each(json, function(index, value) {
if(index == 0 || (index > 0 && json[index-1].log_sheet.time !== value.log_sheet.time))
{
console.log("-----------");
}
console.log("Date " + index + ": " + value.log_sheet.date);
console.log("Time " + index + ": " + value.log_sheet.time);
console.log("Data " + index + ": " + value.log_sheet.data);
});
结果:
All logs:
-----------
Date 0: 2012-07-27T00:00:00-06:00
Time 0: 2000-01-01T02:15:00Z
Data 0: 4
Date 1: 2012-07-27T00:00:00-06:00
Time 1: 2000-01-01T02:15:00Z
Data 1: 4
Date 2: 2012-07-27T00:00:00-06:00
Time 2: 2000-01-01T02:15:00Z
Data 2: 4
-----------
Date 3: 2012-07-27T00:00:00-06:00
Time 3: 2000-01-01T02:17:00Z
Data 3: 4
所以重写的函数看起来像这样:
function getAllLogs(emId) {
$.getJSON('datafile.json', function(data) {
var $output = $("#" + emId);
$output.html("All logs:<br>");
$.each(data, function(index, value) {
//Only displays dates once, then all log sheets for that date
if(index == 0 || (index > 0 && json[index-1].log_sheet.time !== value.log_sheet.time))
{
$output.append("<br>----------------<br>");
//Formats and appends date to a paragraph
//getLogDate(emId, index);
$output.append("Date " + index + ": " + value.log_sheet.time +"<br/>");
}
//Formats and appends time to a paragraph
//getLogTime(emId, index);
$output.append("Time " + index + ": " + value.log_sheet.time +"<br/>");
//Formats and appends all data to a paragraph
//getLogData(emId, index);
$output.append("Data " + index + ": " + value.log_sheet.data +"<br/>");
});
});
}
答案 1 :(得分:1)
问题在于,当您使用$.getJSON()
获得更多数据时,您正在使用异步的AJAX。这意味着脚本不会停止等待调用完成但继续执行。由于从服务器检索数据时出现延迟,但立即打印分隔符,因此数据始终在分隔符后打印。
一个简单的解决方法是为主循环中的数据保留容器,以便在AJAX调用完成时无关紧要。
function getAllLogs(emId) {
$.getJSON('datafile.json', function(data) {
var $emId = $( '#' + emId ); // cache the main container
$("#" + emId).html("All logs:<br>");
var firstDateDisplayed = false;
$.each(data, function(index, value) {
//Only displays dates once, then all log sheets for that date
if (firstDateDisplayed === false ||
data[index-1].log_sheet.time !== value.log_sheet.time) {
$emId.append("<br>----------------<br>");
// create a container for the date and have getLogDate() fill it later
$emId.append( '<div id="'+emId+'Date'+index+'"></div>' );
getLogDate(emId+'Date'+index, index);
firstDateDisplayed = true;
}
// do the same to the rest of the functions as we did above for getLogDate()
$emId.append( '<div id="'+emId+'Time'+index+'"></div>' );
$emId.append( '<div id="'+emId+'Data'+index+'"></div>' );
getLogTime(emId+'Time'+index, index);
getLogData(emId+'Data'+index, index);
});
});
}
答案 2 :(得分:0)
从我的帖子收集内容,您实际上是按data
属性对time
和date
的日志进行分组。如果那是演员,你可以尝试这样的事情:
function getAllLogs(elementId)
{
$.getJSON('datafile.json', function(data)
{
var logElement = $('#' + elementId).append('All logs:<br />');
var lastLogDateDisplayed = null;
$.each(data, function(index, value)
{
// check if we've reached another date
if (lastLogDateDisplayed != value.log_sheet.date)
{
// update the last shown date, and select its html
lastLogDateDisplayed = value.log_sheet.date;
logElement.append('----------------<br />');
.append(getLogDate(value));
}
// select the time and data as html strings
logElement.append(getLogTime(value))
.append(getLogData(value));
});
});
}
这里有一些值得注意的改进。首先,我们只选择一次elementId
元素。这可以提高我们的选择器的效果,从之前的1 + 4n
命中率降至1
。此外,因此,getLogDate
,getLogTime
和getLogData
不接受value
(即当前日志项),并返回dom,或jQuery对象追加到日志元素本身。
这是一些改动,但它更清洁,希望有助于解决您的问题。