我不太清楚如何闡明我在這篇文章的標題中要做的事情,所以如果標題有誤導性或者含糊不清,請原諒我。用Javascript處理對象數組
我有一個從oData調用創建的對象數組(這是在SAPUI5應用程序中)。實際的對象有三個以上的鍵/值對,但爲了保持這個例子的簡單性,我將這些對刪除了。
[{
"note_type_description": "General",
"note_date": "/Date(872850505000)/",
"note_text": "THIS IS A SUBSIDUARY OF THAT."
},
{
"note_type_description": "General",
"note_date": "/Date(873072000000)/",
"note_text": "Say What Now?"
},
{
"note_type_description": "General",
"note_date": "/Date(891388800000)/",
"note_text": "Say Who Now?"
},
{
"note_type_description": "General",
"note_date": "/Date(891993600000)/",
"note_text": "Say When Now?"
},
{
"note_type_description": "Interaction",
"note_date": "/Date(909014400000)/",
"note_text": "Say How Now?"
},
{
"note_type_description": "Interaction",
"note_date": "/Date(906422400000)/",
"note_text": "Say Valentine Now?"
},
{
"note_type_description": "Interaction",
"note_date": "/Date(1485907200000)/",
"note_text": "The latest interaction."
},
{
"note_type_description": "Company Information",
"note_date": "/Date(1477958400000)/",
"note_text": "Some information about Person"
},
{
"note_type_description": "Company Information",
"note_date": "/Date(1483228800000)/",
"note_text": "Are they private or public?"
},
{
"note_type_description": "Company Information",
"note_date": "/Date(1485907200000)/",
"note_text": "Hope this is enough information!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1485993600000)/",
"note_text": "Good!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1487116800000)/",
"note_text": "Better!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1488412800000)/",
"note_text": "Best!"
},
{
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1490918400000)/",
"note_text": "Superb!"
}]
我想通過對象進行迭代,並創建包含兩個最新條目(note_date)的每個類型(note_type_description)的,所以我可以呈現的是,在UI對象的一個新的數組。
我對JS有點新,所以我主要是不清楚我用什麼數組來完成這個任務。我想這將從Array.map()開始並從那裏開始。任何援助將不勝感激!我會繼續阻止這一切,併發布我一路上的更新!
** **更新
我用@Titus的例子,這裏是什麼樣子後位修飾(切換從箭頭功能常規功能):
var oArr = [{
"note_type_description": "General",
"note_date": "/Date(872850505000)/",
"note_text": "THIS IS A SUBSIDUARY OF THAT."
}, {
"note_type_description": "General",
"note_date": "/Date(873072000000)/",
"note_text": "Say What Now?"
}, {
"note_type_description": "General",
"note_date": "/Date(891388800000)/",
"note_text": "Say Who Now?"
}, {
"note_type_description": "General",
"note_date": "/Date(891993600000)/",
"note_text": "Say When Now?"
}, {
"note_type_description": "Interaction",
"note_date": "/Date(909014400000)/",
"note_text": "Say How Now?"
}, {
"note_type_description": "Interaction",
"note_date": "/Date(906422400000)/",
"note_text": "Say Valentine Now?"
}, {
"note_type_description": "Interaction",
"note_date": "/Date(1485907200000)/",
"note_text": "The latest interaction."
}, {
"note_type_description": "Company Information",
"note_date": "/Date(1477958400000)/",
"note_text": "Some information about Person"
}, {
"note_type_description": "Company Information",
"note_date": "/Date(1483228800000)/",
"note_text": "Are they private or public?"
}, {
"note_type_description": "Company Information",
"note_date": "/Date(1485907200000)/",
"note_text": "Hope this is enough information!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1485993600000)/",
"note_text": "Good!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1487116800000)/",
"note_text": "Better!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1488412800000)/",
"note_text": "Best!"
}, {
"note_type_description": "Relationship Strategy",
"note_date": "/Date(1490918400000)/",
"note_text": "Superb!"
}];
var sortedArr = oArr.sort(function(a, b) {
b.note_date.match(/\d+/)[0] - a.note_date.match(/\d+/)[0]
});
var toRender = [];
sortedArr.forEach(function(v) {
if (toRender.filter(function(vv) {
return v.note_type_description == vv.note_type_description
}).length < 2) {
toRender.push(v);
}
});
toRender.forEach(function(oKey) {
console.log(oKey.note_type_description + " | " + oKey.note_text);
});
* ****更新#2 *****
只是爲了完成這一點,並給予而言,這裏是我結束了:
_setNotes: function(oResponse) {
if (typeof oResponse.results !== "undefined") {
var aAllNotes = oResponse.results;
var aTruncNotes = [];
var sortedNotes = aAllNotes.sort(function(a, b) {
a = new Date(a.note_date);
b = new Date(b.note_date);
return a>b ? -1 : a<b ? 1 : 0;
});
sortedNotes.forEach(function(v) {
if (aTruncNotes.filter(function(vv) {
return v.note_type_description === vv.note_type_description;
}).length < 2) {
aTruncNotes.push(v);
}
});
}
this.getView().getModel("view").setProperty("/allNotes", aAllNotes);
this.getView().getModel("view").setProperty("/truncNotes", aTruncNotes);
}
現在我可以稱之爲「truncNotes」對象在我UI5 XML視圖,並返回爲這樣:
[訪問/進程(嵌套)對象,數組或JSON]的可能重複(http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json) – Liam
請發佈您試過的代碼 – user93
您是什麼意思最近的條目?此外,什麼阻止你使用現有的數組來呈現你的輸出,爲什麼你不能只使用你擁有的數組? – dave