在NodeJS中为PowerBI创建自定义视觉对象-“找不到名称'IVisualHost' [英] Creating a custom visual for PowerBI in NodeJS - "Cannot find name 'IVisualHost'

问题描述

我正在尝试按照本教程为Power BI创建自定义视觉： https://docs.microsoft.com/en-us/power-bi/developer/custom-visual-develop-tutorial

I'm trying to follow this tutorial on creating a custom visual for Power BI : https://docs.microsoft.com/en-us/power-bi/developer/custom-visual-develop-tutorial

当我连接到Power BI Cloud时，使用默认代码的测试可以正常工作，如教程的测试自定义视觉效果步骤8中所示。

The test with the default code works properly when I connect to Power BI Cloud, as shown in the part"Testing the custom visual" step 8, of the tutorial.

问题是，当我尝试在visual.ts文件中添加类级别的属性时（在删除了本教程的开发视觉元素的步骤2中指示的代码之后），我得到了

The problem is when I try to add the class-level properties in the visual.ts file (after I deleted the code as indicated in the part "Developing the visual elements" step 2 of the tutorial ), I get the error "Cannot find name 'IVisualHost'".

"use strict";

import "core-js/stable";
import "./../style/visual.less";
import powerbi from "powerbi-visuals-api";
import VisualConstructorOptions = powerbi.extensibility.visual.VisualConstructorOptions;
import VisualUpdateOptions = powerbi.extensibility.visual.VisualUpdateOptions;
import IVisual = powerbi.extensibility.visual.IVisual;
import EnumerateVisualObjectInstancesOptions = powerbi.EnumerateVisualObjectInstancesOptions;
import VisualObjectInstance = powerbi.VisualObjectInstance;
import DataView = powerbi.DataView;
import VisualObjectInstanceEnumerationObject = powerbi.VisualObjectInstanceEnumerationObject;

import { VisualSettings } from "./settings";
export class Visual implements IVisual {
    private host: IVisualHost; ------------ the first error is here
    private svg: d3.Selection<SVGElement>;
    private container: d3.Selection<SVGElement>;
    private circle: d3.Selection<SVGElement>;
    private textValue: d3.Selection<SVGElement>;
    private textLabel: d3.Selection<SVGElement>;

    constructor(options: VisualConstructorOptions) {
        this.svg = d3.select(options.element) ----------- the second error is here
            .append('svg')
            .classed('circleCard', true);
        this.container = this.svg.append("g")
            .classed('container', true);
        this.circle = this.container.append("circle")
            .classed('circle', true);
        this.textValue = this.container.append("text")
            .classed("textValue", true);
        this.textLabel = this.container.append("text")
            .classed("textLabel", true);
    }

我在同一visual.ts文件中也遇到此其他错误：'d3 '表示UMD全局，但当前文件是一个模块。考虑添加导入。我使用以下命令导入了库： npm i d3@3.5.5 --save和 npm i @ types / d3 @ 3.5

I also have this other error in the same visual.ts file : 'd3' refers to a UMD global, but the current file is a module. Consider adding an import instead. I imported the library with the commands : "npm i d3@3.5.5 --save" and "npm i @types/d3@3.5"

这是我的pbiviz .json文件：

This is my pbiviz.json file :

{
    "visual": {
        "name": "visual9basic",
        "displayName": "visual9basic",
        "guid": "visual9basic252E75AF09794C8F8CE14414674FBC3E",
        "visualClassName": "Visual",
        "version": "1.0.0",
        "description": "",
        "supportUrl": "",
        "gitHubUrl": ""
    },
    "apiVersion": "2.6.0",
    "author": {
        "name": "",
        "email": ""
    },
    "assets": {
        "icon": "assets/icon.png"
    },
    "externalJS": [
        "node_modules/powerbi-visuals-utils-dataviewutils/lib/index.js",
        "node_modules/d3/d3.min.js"
    ],
    "style": "style/visual.less",
    "capabilities": "capabilities.json",
    "dependencies": null,
    "stringResources": []
}

这是我的tsconfig.json：

Here is my tsconfig.json :

{
    "compilerOptions": {
        "allowJs": false,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "target": "es6",
        "sourceMap": true,
        "outDir": "./.tmp/build/",
        "moduleResolution": "node",
        "declaration": true,
        "lib": [
            "es2015",
            "dom"
        ]
    },
    "files": [
        "node_modules/powerbi-visuals-utils-dataviewutils/lib/index.js",
        "./src/visual.ts",
        "./src/settings.ts",
    ]
}

推荐答案

在Visual.ts中，尝试添加以下导入：

In Visual.ts, try adding the following import:

import IVisualHost = powerbi.extensibility.IVisualHost;

它应该处理丢失的接口引用。
对于d3参考，您可以尝试

It should take care of the missing interface reference. For the d3 reference you can try

import * as d3 from "d3";

希望这会有所帮助。我还没有亲自完成本教程。

Hope this helps. I haven't worked through the tutorial myself yet.

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