Question

我有一个页面，显示了从REST API消耗的建筑物的列表；我的目标是在点击建筑物网址时在另一页（详细信息页面）上显示有关建筑物的详细信息。问题在于单击该URL时，它将加载详细信息页面，但API中的任何数据均未显示（内容为空白）

在“列出建筑物页面”上，我的网址设置如下：

<NavLink
          className="url-temp"
          to={`/buildingdetails/${building.crgBuildingid}`}
        >Details</NavLink>

**在“详细信息页面中，我已设置了组件：”

import React, { Component } from "react";
import moment from 'moment';
import { getAuditTypeDescFromId, allAuditTypes, auditTypeToIdMap } from '../constants/audit-types';
import { getCodeTypeDescFromId, allCodeTypes, codeTypeToIdMap } from '../constants/code-types';
import { NavLink } from "react-router-dom";
import { withRouter } from 'react-router'

class Buildingdetails extends Component {
    constructor(props) {
        super(props);
        this.state = {
            buildings: [],
            isLoaded: false,
        }
    }

    componentDidMount() {
        const buildingId = this.props.match.params.id;

        const url = `http://...../buildings/${buildingId}`
        fetch(url)
            .then(res => res.json())
            .then(buildings => {
                isLoaded: true,
                    this.setState({ buildings })
            });
    }

    render() {

        var { isLoaded, buildings } = this.state;
        if (!isLoaded) {
            return <div>Loading...</div>
        }
        else {
            // print properties from this.state.building.crgName
            return (
                <div className="appcontent-inner">
                    <p>Building Details</p>
                   <div>
                       {buildings.map(building => (
                           <div key={building.id}>
                                <b>Building Name:</b> this.state.building.crgName
                           </div>
                       ))};
                   </div>
                </div>
            );

        }
    }
}
export default withRouter(Buildingdetails);

这是详细信息页面的JSON示例：

{
    "$id": "1",
    "Id": null,
    "crgName": “Walmart”,
    "crgManagerspecialistid": {
        "$id": "2",
        "Id": “00000-111-698-2333-123456”,
        “ContactName": "contact",
        "Name": “Jane Doe”,
        "KeyAttributes": [],
        "RowVersion": null
    },
    "crgOpeningdate": "2018-09-03T11:38:23",
    "crgManagerid": {
        "$id": "3",
        "Id": “0000-7312-e411-abcd-0050568571f6",
        "LogicalName": "crg_energyprogram",
        "Name": “Janet kay”,
        "KeyAttributes": [],
        "RowVersion": null
    }
}

我可以得到一些有关我出了什么问题的指导吗？预先谢谢你

Answer 1

尝试更新您的componentDidMount()，尤其是最后的then()。该块具有可能导致问题的不同语法的组合。 isLoaded必须放在要传递的对象setState()中，以确保无论如何都可以对其进行更新。

componentDidMount() {
  const buildingId = this.props.match.params.id;
  const url = `http://...../buildings/${buildingId}`;

  fetch(url)
    .then(res => res.json())
    .then(buildings => {      
      this.setState({ isLoaded: true, buildings });
    });
  }

这还假设您的 react-router-dom Route如下：

<Route path="/buildingdetails/:id" component={Buildingdetails} />

希望有帮助！

ReactJS-如何使用状态在页面之间传递JSON数据？

1 个答案: