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Я экспериментировал с D3 и картами. Все примеры и руководства, которые я видел до сих пор, строят SVG из GeoJSON и добавляют данные. Но у меня есть SVG-карта уже в html и вы хотите добавить данные к путям с D3 (и иметь возможность переключаться между наборами данных, но это следующий барьер).Добавить данные на сервер SVG с D3
Я добавил идентификаторы к путям, но не могу найти способ использовать ключевую функцию для соответствия идентификаторам путей с идентификаторами в моих данных.
Вот мой вопрос: Является ли такое соответствие всем возможным и как? Или я должен использовать маршрут GeoJSON?
Вот моя страница упрощенным и код:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Bevolkingsprognose</title>
<script src="../d3/d3.v2.min.js"></script>
<style type="text/css">
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<body>
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</g>
</g>
</svg>
</div>
<script type="text/javascript">
//The data (province, datatype, year and value)
var data = [
{"provincie":"flevoland",
"type":"bevolking",
"jaar":2008,
"value":25},
{"provincie":"limburg",
"type":"bevolking",
"jaar":2008,
"value":25}
];
//Set the default selection
var selectedYear = 2008;
var selectedType = "bevolking";
//Make the data hierarchical
var nestedData = d3.nest()
.key(function(d) {return d.type; })
.key(function(d) {return d.jaar; })
.entries(data);
//Get the correct data
var mapdata = nestedData[selectedType][selectedYear];
//Get the SVG
var svg = d3.select("svg");
//Data koppelen aan provincie en mouseover/mouseout toevoegen
svg.selectAll("g.provincies path")
.data(mapdata)
.style("fill", function(d) { return d.value; });
</script>
</body>
</html>
Я не совсем понимаю, функцию ключа. Как я его читаю, если нет элемента данных, тогда используется идентификатор пути. Нужно ли присоединяться к данным, поскольку не было бы соответствующего элемента массива, и соединение не было бы необходимым? Работает ли функция данных через массив данных или через выбранные пути? Просто пытаюсь обвести вокруг себя голову, чтобы лучше понять D3. – user1492600
Функция данных выполняет итерацию как по данным, так и по элементам, применяя ключевую функцию к каждому. Когда ключ для элемента данных и элемента совпадает, данные привязаны к элементу и помещаются в выборку обновления. Остальные данные помещаются в поле ввода, а оставшиеся элементы помещаются в выбор выхода. – mbostock
Спасибо, Майк. Я попробовал различные выборы, удалив имя провинции из массива и добавив неизвестный. Как и ожидалось, один путь был помещен в выбор выхода. Я назначил класс нодата, чтобы показать его. Новая провинция была визуализирована путем добавления круга для элементов ввода-отбора. Он работает, но я до сих пор не понимаю, КАК работает ключевая функция. Зачем сравнивать с d.provincie, если есть данные и в противном случае с this.id? Я просто чувствую, что упускаю то, что может быть очевидно для вас. – user1492600