我有类似于这里提到的 JSFiddle的东西。JSFiddle 工作正常，但是，我在我的代码中看到了一个奇怪的行为。即使我看到在从 web 服务返回的数据（JSON 格式）中，每个记录都存在描述，但第一个单元格的描述始终为空。请查看下面的代码，如果我遗漏任何内容，请告诉我：
this.processEmployees = function (data_, textStatus_, jqXHR_) {
var collection = data_.employees;
// A helper function used for employee codes below.
var isUsedKey = function (arrayOfObject, key) {
for (var i = 0; i < arrayOfObject.length; i += 1) {
if (arrayOfObject[i].key == key) {
return true;
}
}
return false;
};
var employeeCodes = [];
for (var i = 0; i < collection.length; i++) {
if (i == 0) {
var newItem = {};
newItem.key = collection[i].code_value;
newItem.dates = [collection[i].code_assignment_date];
newItem.description = collection[i].code_description;
newItem.hiringCriterion = collection[i].hiring_criteria;
newItem.name = collection[i].name;
console.log("Would like to check code_description for first item:",collection[i].code_description);
//debugger;
employeeCodes.push(newItem);
} else {
var item = collection[i];
var itemName = item.code_value;
var itemDate = item.code_assignment_date;
var itemDescription = item.code_description;
var hiringCriterion = item.hiring_criteria;
var itemCodeName = item.name;
if (isUsedKey(employeeCodes, itemName)) {
for (var j = 0; j < employeeCodes.length; j++) {
if (employeeCodes[j].key == itemName) {
var index = employeeCodes[j].dates.length;
employeeCodes[j].dates[index] = itemDate;
}
}
} else {
var nextNewItem = {};
nextNewItem.key = itemName;
nextNewItem.dates = [itemDate];
nextNewItem.code_description = itemDescription;
nextNewItem.hiring_criteria = hiringCriterion;
nextNewItem.name = itemCodeName;
employeeCodes.push(nextNewItem);
}
}
}
var newSource = {
localdata: employeeCodes,
datafields: [{
name: 'code_value',
type: 'string',
map: 'key'
},
{
name: 'code_assignment_date',
type: 'date',
map: 'dates>0'
},
{
name: 'name',
type: 'string'
},
{
name: 'code_description',
type: 'string'
},
{
name: 'hiring_criteria',
type: 'string'
}
],
datatype: "array"
};
var newAdapter = new $_.jqx.dataAdapter(newSource);
var iconrenderer = function (row, columnfield, value, defaulthtml, columnproperties) {
var icon = '';
if (employeeCodes[row].dates.length > 1) {
icon = '<img src="images/icon-down.png" style="position: absolute; right: 5px;" />';
}
return '<span style="position: relative; width: 100%; margin: 4px; float: ' + columnproperties.cellsalign + ';">' + newAdapter.formatDate(value, 'd') + icon + '</span>';
};
$_(self.gridSelector).jqxGrid({
source: newAdapter,
editable: true,
width: '600',
pageable: true,
sortable: true,
autoheight: true,
theme: 'classic',
height: '170',
columnsResize: true,
columns: [
{
text: 'Employee Name',
datafield: 'name',
width: 85,
},
{
text: 'Code Value',
datafield: 'code_value',
width: 75,
editable: false
},
{
text: 'Latest Date(s)',
datafield: 'code_assignment_date',
cellsformat: 'd',
columntype: 'combobox',
width: 100
createeditor: function (row, column, editor) {
var info = $_(self.gridSelector).jqxGrid('getrowdata', row);
console.log("length of info: " + info);
var groupName = info.code_value;
console.log("Contents of groupName: " + groupName);
var dates = [];
for (var i = 0; i < employeeCodes.length; i++) {
if (employeeCodes[i].key == groupName) {
dates = employeeCodes[i].dates;
}
}
editor.jqxComboBox({ autoDropDownHeight: false, source: dates, promptText: "Previous Date(s):", scrollBarSize: 10 });
},
initeditor: function (row, column, editor) {
var info = $_(self.gridSelector).jqxGrid('getrowdata', row);
var groupName = info.code_value;
var dates = [];
for (var i = 0; i < employeeCodes.length; i++) {
if (employeeCodes[i].key == groupName) {
dates = employeeCodes[i].dates;
}
}
editor.jqxComboBox({
autoDropDownHeight: false,
source: dates,
promptText: "Dates:",
width: 100,
scrollBarSize: 10,
renderer: function (index_, label_, value_) {
return formatDateString(value_);
},
renderSelectedItem: function (index, item) {
var records = editor.jqxComboBox('getItems');
var currentRecord = records[index].label;
return formatDateString(currentRecord);;
}
});
},
cellvaluechanging: function (row, column, columntype, oldvalue, newvalue) {
// return the old value, if the new value is empty.
if (newvalue == "") return oldvalue;
}
},
{
text: 'Description',
datafield: 'code_description'
},
{
text: 'Hiring Criterion',
datafield: 'hiring_criteria',
editable: false,
hidden: true
}
],
});
}; // End of processEmployees
例如，如果我的 JSON 如下：
{
"employees": [{
"code_value": "B1",
"code_assignment_date": "2016-12-13 23:04:00.0",
"code_type": 7,
"code_description": "This employee has received his salary",
"name": "Peter",
"hiring_criteria": null
}, {
"code_value": "A1",
"code_assignment_date": "2016-05-20 05:00:00.0",
"code_type": 7,
"code_description": "Employee has 5 vacation days left",
"name": "Jack",
"hiring_criteria": null
}],
"webServiceStatus": {
"status": "SUCCESS",
"message": "2 results"
}
}
我没有看到上面 JSON 响应中的第一个code_description值，This employee has received his salary而上面代码中提到的以下行在控制台面板中清楚地显示了它：
console.log("Would like to check code_description for first item:",collection[i].code_description);