使用指定的 x 和 y 值更新动态 Dojo 图表
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【中文标题】使用指定的 x 和 y 值更新动态 Dojo 图表【英文标题】:Updating a dynamic Dojo chart with specified x and y values 【发布时间】:2011-07-04 10:12:53 【问题描述】:我正在构建一个需要动态更新折线图的网站。 为此,我正在使用 dojo 库,该库提供了实现这一目标所需的必要图表功能,完全基于他们网站上提供的这个示例:
http://dojotoolkit.org/documentation/tutorials/1.6/charting_advanced/
http://dojotoolkit.org/documentation/tutorials/1.6/charting_advanced/demo/store-series.html
这个例子向我展示了如何用新的 y 值更新图形,并将 x 的值加一。 我需要的是使用 (x,y) 的自定义值更新图表并绘制它,但我找不到这样做的方法。 我尝试直接在数据存储中强制 x 和 y 的值,但没有结果,图表将无法加载:
// Initial data
var data = [
// This information, presumably, would come from a database or web service
id: 1, x:0, y:20, site: 1 ,
id: 2, value: 16, site: 1 ,
id: 3, value: 11, site: 1 ,
id: 4, value: 18, site: 1 ,
id: 5, value: 26, site: 1 ,
id: 6, value: 19, site: 2 ,
id: 7, value: 20, site: 2 ,
id: 8, value: 28, site: 2 ,
id: 9, value: 12, site: 2 ,
id: 10, value: 4, site: 2
];
// Create the data store
// Store information in a data store on the client side
var store = dojo.store.Observable(new dojo.store.Memory(
data:
identifier: "id",
label: "Users Online",
items: data
));
Google 并没有给我更多帮助。 如何使用自定义 (x,y) 值对动态更新此数据存储? 有没有其他方法可以做到这一点?
最好的问候
【问题讨论】:
【参考方案1】:假设您使用文本输入更改了一些 (x,y) 值。解决方案很简单(如果我理解你的问题):
dojo.connect(dijit.byId("someInputElement"), "onChange",
function()
chart.updateSeries("bla bla", new_data).render();
//new data is the data store with custom(x,y)
);
希望对你有帮助!
【讨论】:
【参考方案2】:好的,这会有点长,我知道我迟到了 7 年,但这是我创建动态更新图表的代码。
var start=1;
var end=10;
require([
'dojo/on',
'dojo',
'dojo/ready',
// Require the basic chart class
"dojox/charting/Chart",
// Require the theme of our choosing
"dojox/charting/themes/MiamiNice",
// We want to plot Columns
"dojox/charting/plot2d/Columns",
// Require the highlighter
"dojox/charting/action2d/Highlight",
"dojo/store/Observable",
"dojo/store/Memory",
'dojox/charting/StoreSeries',
// We want to use Markers
"dojox/charting/plot2d/Markers",
// We'll use default x/y axes
"dojox/charting/axis2d/Default",
// Wait until the DOM is ready
"dojo/domReady!",
"dojo/dom"
], function(on, dojo, ready, Chart, theme, ColumnsPlot, Highlight, ObservableStore, MemoryStore, StoreSeries)
ready(function()
// Define the data
var data = [
// This information, presumably, would come from a database or web service
// Just hardcoded data for now.. Site is set to 2 when we want to hide an element
id: 1, value: 20, site: 1 ,
id: 2, value: 16, site: 1 ,
id: 3, value: 11, site: 1 ,
id: 4, value: 18, site: 1 ,
id: 5, value: 26, site: 1 ,
id: 6, value: 19, site: 1 ,
id: 7, value: 20, site: 1 ,
id: 8, value: 28, site: 1 ,
id: 9, value: 12, site: 1 ,
id: 10, value: 4, site: 1
];
// Create the data store
// Store information in a data store on the client side
var store = new ObservableStore(new MemoryStore(
data:
idProperty: "id",
label: "Users Online",
items: data
));
// Create the chart within it's "holding" node
var chart = new Chart("chartNode",
title: "Random Data(Sliding)",
titlePos: "top",
titleGap: 25,
titleFont: "normal normal normal 15pt Arial",
titleFontColor: "orange"
);
// Set the theme
chart.setTheme(theme);
// Add the only/default plot
chart.addPlot("default",
type: ColumnsPlot,
markers: true,
gap: 5
);
// Add axes. We recreated x axis every time the user slides to change the values
chart.addAxis("x", fixLower: "minor", fixUpper: "minor", natural: false,
font: "normal normal 10pt Arial",
labels: [value: 1, text: start,
value: 2, text: start+1,
value: 3, text: start+2,
value: 4, text: start+3,
value: 5, text: start+4,
value: 6, text: start+5,
value: 7, text: start+6,
value: 8, text: start+7,
value: 9, text: start+8,
value: 10, text: start+9,
]
);
chart.addAxis("y", vertical: true, fixLower: "major", fixUpper: "major" );
// Add the series of data
chart.addSeries("y", new StoreSeries(store, query: site: 1 , sort: attribute: "id", ascending: true , "value"));
// Highlight!
new Highlight(chart,"default");
// Render the chart!
chart.render();
// Forward button to slide forward adding a random item to the chart
var forButton = dojo.byId("forward-btn");
on (forButton, "click", function(evt)
// console.log(start + ' ' + end);
end += 1;
var item =
id: end,
value: Math.floor((Math.random() * 16) + 1),
site: 1
//hide starting element
store.put(id: start,value: store.get(start).value,site: 2, overwrite: true);
start+=1;
//put the new value at the end of the store
store.put(item, overwrite: true);
//recreated x axis
chart.addAxis("x", fixLower: "minor", fixUpper: "minor", natural: false,
font: "normal normal 10pt Arial",
labels: [value: 1, text: start,
value: 2, text: start+1,
value: 3, text: start+2,
value: 4, text: start+3,
value: 5, text: start+4,
value: 6, text: start+5,
value: 7, text: start+6,
value: 8, text: start+7,
value: 9, text: start+8,
value: 10, text: start+9,
]
);
);
//backButton to slide back towards the start. Same as forward, but reversing the effects
var backButton = dojo.byId("backward-btn");
on (backButton, "click", function(evt)
if(start>1)
start-=1;
end-=1;
// console.log(start + ' ' + end);
store.put(id: start,value: store.get(start).value,site: 1, overwrite: true);
store.put(id: end+1, value: store.get(end+1).value, site: 2, overwrite: true);
store.query(site: 1,sort: [attribute: "id", ascending: true]).forEach(function(newItem)
store.remove(newItem.id);
store.add(newItem);
// console.log(newItem);
)
chart.addAxis("x", fixLower: "minor", fixUpper: "minor", natural: false,
font: "normal normal 10pt Arial",
labels: [value: 1, text: start,
value: 2, text: start+1,
value: 3, text: start+2,
value: 4, text: start+3,
value: 5, text: start+4,
value: 6, text: start+5,
value: 7, text: start+6,
value: 8, text: start+7,
value: 9, text: start+8,
value: 10, text: start+9,
]
);
else
//And a simple alert to inform the user that he can not go backwards anymore
alert('You hit the start of the data!');
);
);
);
在 html 中,我有两个带有 id 的按钮,如按钮元素中所述,还有一个用于实现图表的 chartNode。如果有人需要,我也可以放置我的 dojoConfig,但我是从教程中获得的,所以那里没有隐藏什么大知识。
【讨论】:
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