Question

parse(new String[] { "foo", "bar", "baz" });

我正在从JSON文件加载数据并将其结构化为HTML表。我能够获取数据并构建它，但问题是它不会反映为HTML表，即插值不起作用。虽然变量带有各自的值。

Answer 1

使用箭头函数来保持'this'的上下文不变。

reloadData() {
            this._spservice.fetchData()
                .subscribe((data) => {
                    this.data = [];
                    this.data = data;
                    this.heads = Object.keys(data[0]);
                    var len = this.heads.length;
                    console.log(this.heads);
                },
                err => console.log(err),
                () => console.log('Completed'));
        }

Answer 2

你有一个Extra BackTick导致整个代码成为一个字符串。只需删除它。复制粘贴以下代码： -

import {Component} from 'angular2/core';
import {Observable} from 'rxjs/Observable';
import {Http} from 'angular2/http';
import {SpsheetService} from './spsheet.service';
import 'rxjs/Rx';


@Component({
 selector: 'my-spsheet',
 template: `
             <button id="fetch" (click)="reloadData()">Reload Data</button>
            <table class="table">
            <thead>
                <tr>
                    <th *ngFor="#head of heads">
                        {{head | async}}
                    </th>
                </tr>
            </thead>
            <tbody>
                <tr *ngFor="#dat of data">
                    <td *ngFor="#head of heads" contenteditable="true">
                        {{dat.head | async}}
                    </td>
                </tr>
            </tbody>
        </table>
        `,
],
providers: [SpsheetService]
 })

export class SpsheetComponent {
    data:any[];
    heads:string[];
    otherdata:string[];
    constructor(private _http:Http,private _spservice:SpsheetService){}

    reloadData(){
        this._spservice.fetchData()
            .subscribe(function(data) 
            {
                var me =this;
                me.data =[];
                me.data = data;
                me.heads = Object.keys(data[0]);
                var len = me.heads.length;
                console.log(me.heads);

            },
            err => console.log(err),
            () => console.log('Completed'));
    }


 }

Answer 3

我已经解决过这个问题，这实际上是一个问题，而这个＆＃39;订户的实例。

实际正确的代码是：

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import numpy as np

vectors=np.array( [ [0,0,1,1,-2,0], [0,0,2,1,1,0],[0,0,3,2,1,0],[0,0,4,0.5,0.7,0]]) 
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
for vector in vectors:
    v = np.array([vector[3],vector[4],vector[5]])
    vlength=np.linalg.norm(v)
    ax.quiver(vector[0],vector[1],vector[2],vector[3],vector[4],vector[5],
            pivot='tail',length=vlength,arrow_length_ratio=0.3/vlength)
ax.set_xlim([-4,4])
ax.set_ylim([-4,4])
ax.set_zlim([0,4])
ax.set_xlabel('x')
ax.set_ylabel('y')
ax.set_zlabel('z')
plt.show()

插值不在angular2中工作

3 个答案: