![](/img/trans.png)
[英]How to access or update the component class variable in other component class angular2
[英]Angular2 passing values to other class
我試圖在我的NG2-app中使用D3圖表,並且我已經使用硬編碼數據運行“圖表”。 我正在尋找一種能夠將數據從另一個組件傳遞到圖表的方法。 這是“父”組件,其中包含顯示圖形的指令:
@Component({
selector: "homeTest",
properties: [ 'data' ]
})
@View({
directives: [CORE_DIRECTIVES, BarGraph],
template: `
<h1 class="title">Angular 2</h1>
<bar-graph>
</bar-graph>
`
})
export class HomeTest {
meter: any;
consumption: any;
elementRef: any;
constructor() {}
它從這個組件中獲取我想在圖中使用的數據。 讓我們說它看起來像這樣:
PassThisArrayToBarChart(){
var dataset = [
{ key: 0, value: 5 },
{ key: 1, value: 10 }
];
//Pass this dataSet to Barchart somehow?
}
這里是我們有D3圖表的類,需要一個數據集:
@Directive({
selector: 'bar-graph',
})
class BarGraph {
data: Array<number>;
divs: any;
dataset: any;
constructor(
@Inject(ElementRef) elementRef: ElementRef,
@Attribute('width') width: string,
@Attribute('height') height: string) {
var w = 600;
var h = 250;
var dataset = [
{ key: 0, value: 5 },
{ key: 1, value: 10 }
];
...
正如你在這里看到的,我有一個硬編碼的數據集,但它如何被HomeTest傳遞的數據集取代?
如果需要,這是BarGraph的其余部分:
var xScale = d3.scale.ordinal()
.domain(d3.range(dataset.length))
.rangeRoundBands([0, w], 0.05);
var yScale = d3.scale.linear()
.domain([0, d3.max(dataset, function(d) {return d.value;})])
.range([0, h]);
var key = function(d) {
return d.key;
};
//Create SVG element
var svg = d3.select("bar-graph")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset, key)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return h - yScale(d.value);
})
.attr("width", xScale.rangeBand())
.attr("height", function(d) {
return yScale(d.value);
})
.attr("fill", function(d) {
return "rgb(0, 0, " + (d.value * 10) + ")";
})
//Create labels
svg.selectAll("text")
.data(dataset, key)
.enter()
.append("text")
.text(function(d) {
return d.value;
})
.attr("text-anchor", "middle")
.attr("x", function(d, i) {
return xScale(i) + xScale.rangeBand() / 2;
})
.attr("y", function(d) {
return h - yScale(d.value) + 14;
})
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white");
}
更新:
@Component({
selector: "homeTest",
properties: [ 'data' ]
})
@View({
directives: [CORE_DIRECTIVES, BarGraph],
template: `
<h1 class="title">Angular 2 + d3</h1>
<bar-graph [graphdata]="dataset">
</bar-graph>
`
})
export class HomeTest {
dataset: Array<Object> = [
{ key: 0, value: 5 },
{ key: 1, value: 10 }
];
constructor() {}
條狀圖:
@Directive({
selector: 'bar-graph',
})
export class BarGraph {
@Input() graphdata;
data: Array<number>;
divs: any;
dataset: any;
constructor(
@Inject(ElementRef) elementRef: ElementRef,
@Attribute('width') width: string,
@Attribute('height') height: string) {
var w = 600;
var h = 250;
var dataset = this.graphdata; //graphData undefined
您應該通過元素的屬性傳遞數據
<bar-graph [graphdata]="dataset">
所以你需要在父類中使用它
export class HomeTest {
dataset: Array<Object> = [
{ key: 0, value: 5 },
{ key: 1, value: 10 }
];
然后在組件本身中拾取它
class BarGraph {
@Input() graphdata;
constructor() {}
afterViewInit() {
var dataset = this.graphdata;
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.