[英]Javascript loop executes in the wrong order
我有一個function
,我想從一個array
創建一個unordered list
。 該array
是嵌套的,因此必須在新array
啟動后創建另一個<ul>
。 function 可以工作,但只有一個問題: unordered list
沒有按正確的順序顯示。 我不知道為什么,因為我在PHP
function
它以正確的順序顯示。 array
如下所示:
$topics = [
'Aanwezigen / afwezigen',
'Toevoegingen agenda',
'Update openstaande actiepunten',
'Marketing' => [
'Website',
'Social media',
'Nieuwsbrief',
],
'Acquisitie' => [
'Leads',
'Deals',
'Netwerk',
],
'Inkoop' => [
'Leveranciers',
'Marges',
],
'Jaarrekening 2018',
'Komende periode',
'Oplezen actiepunten',
'Rondvraag',
];
這是我的Javascript function
:
let HTML = "<ul>";
for (const [key, value] of topics) {
if (Array.isArray(value)) {
HTML = HTML + "<li>" + key + "</li>";
for (let i = 0; i < value.length; i++) {
HTML = HTML + "<ul>";
HTML = HTML + "<li>" + value[i] + "</li>";
HTML = HTML + "</ul>";
}
} else {
HTML = HTML + "<li>" + value + "</li>";
}
}
HTML 的HTML
是這樣的:
如您所見,它將if-statement
中生成的HTML
放在unordered list
的末尾,而它不應該這樣做。 關於如何解決這個問題的任何建議? 或者任何解釋為什么它不像PHP
工作?
更新:
當我console.log
array
topics
時,它看起來像這樣:
(10) [Array(2), Array(2), Array(2), Array(2), Array(2), Array(2), Array(2), Array(2), Array(2), Array(2)]
0: (2) ["0", "Aanwezigen / afwezigen"]
1: (2) ["1", "Toevoegingen agenda"]
2: (2) ["2", "Update openstaande actiepunten"]
3: (2) ["3", "Jaarrekening 2018"]
4: (2) ["4", "Komende periode"]
5: (2) ["5", "Oplezen actiepunten"]
6: (2) ["6", "Rondvraag"]
7: Array(2)
0: "Marketing"
1: (3) ["Website", "Social media", "Nieuwsbrief"]
length: 2
__proto__: Array(0)
8: Array(2)
0: "Acquisitie"
1: (3) ["Leads", "Deals", "Netwerk"]
length: 2
__proto__: Array(0)
9: Array(2)
0: "Inkoop"
1: (2) ["Leveranciers", "Marges"]
length: 2
__proto__: Array(0)
length: 10
__proto__: Array(0)
除了將數據從 json 更改為數組之外,您還需要更改 function。
您的 function 應該如下所示。
for (const value of topics) {
if (Array.isArray(value) && value.length > 1) {
HTML = HTML + "<li>" + value[0] + "</li>";
for (let i = 0; i < value[1].length; i++) {
HTML = HTML + "<ul>";
HTML = HTML + "<li>" + value[1][i] + "</li>";
HTML = HTML + "</ul>";
}
} else {
HTML = HTML + "<li>" + value[0] + "</li>";
}
}
使用 Javascript object。 像這樣迭代它:
let data = { topics: [{ name: 'Aanwezigen/afwezigen' }, { name: 'Toevoegingen agenda' }, { name: 'Update openstaande actiepunten' }, { name: 'Marketing', subtopics: [ 'Website', 'Social media', 'Nieuwsbrief', ] }, { name: 'Acquisitie', subtopics: [ 'Leads', 'Deals', 'Netwerk', ] }, { name: 'Inkoop', subtopics: [ 'Leveranciers', 'Marges', ] }, { name: 'Jaarrekening 2018' }, { name: 'Komende periode' }, { name: 'Oplezen actiepunten' }, { name: 'Rondvraag' } ] }; let container = document.getElementById('container'); const topics = data.topics; if (topics) { var list = '<ul class="list">'; topics.forEach(function(topic) { list = list + "<li>" + topic.name + "</li>"; if (topic.hasOwnProperty('subtopics')) { var sublist = '<ul class="sublist">'; var subtopics = topic.subtopics; for (var i = 0; i < subtopics.length; i++) { sublist = sublist + '<li>' + subtopics[i] + '</li>'; }; sublist = sublist + '</ul>'; } else { var sublist = ''; } list = list + sublist; }); list = list + '</ul>'; container.innerHTML = list; } else { container.innerHTML = '<p>There are no topics</p>'; }
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"> <div id="container"></div>
請注意,JSON 具有對象和 arrays,而 PHP 將兩者合並為一個類型。 JSON 不保留對象的順序; 如果您想要訂單,請務必使用 arrays(即在 PHP 中使用連續的數字索引,沒有字符串鍵)。 這將涉及重組您的陣列。 例如,一個項目列表,其中每個項目由一個名稱和子列表組成:
$topics = [
['Aanwezigen / afwezigen'],
['Toevoegingen agenda'],
['Update openstaande actiepunten'],
['Marketing', [
'Website',
'Social media',
'Nieuwsbrief',
]],
['Acquisitie', [
'Leads',
'Deals',
'Netwerk',
]],
['Inkoop', [
'Leveranciers',
'Marges',
]],
['Jaarrekening 2018'],
['Komende periode'],
['Oplezen actiepunten'],
['Rondvraag'],
];
此結構將保留順序,並且易於在 JavaScript 中迭代。
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