0

我试图让 JSON 数据显示在一个段落中，但在不同日期获取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：

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？我的日期显示正确，但为什么没有分隔线？

获取日志时间函数：

//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>");
    }
});
}
4

3 回答 3

1

所以基本上你想做的是在有新的日期出现时输入----？

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

所以你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/>");
        });
    });
}
于 2012-08-07T19:26:00.823 回答
1

问题是，当您使用 获取更多数据时$.getJSON()，您使用的是异步AJAX 。这意味着脚本不会停止等待调用完成，而是继续执行。由于从服务器检索数据时存在延迟，但分隔符会立即打印，因此数据总是在分隔符之后打印。

一个简单的解决方法是在主循环中为数据保留容器，这样 AJAX 调用何时完成就无关紧要了。

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);
        });
    });
}
于 2012-08-08T07:35:42.423 回答
0

从我可以从您的帖子中收集到的信息来看，您实际上是在按其属性对日志data进行分组。如果这是演员表，你可以尝试这样的事情：timedate

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elementId元素一次。这提高了我们选择器的性能，从之前的命中率1 + 4n下降到1. 此外，因此getLogDate，getLogTime和getLogData不接受value（即当前日志项），而是返回 dom 或 jQuery 对象以附加到日志元素本身。

这是一些改动，但它更干净，希望能帮助解决您的问题。

于 2012-08-07T19:41:12.887 回答