我有一个带有React和Redux的ASP.NET Core项目,我也在使用Kendo React UI。我正在尝试将数据返回到我的Kendo小部件之一,但是当我尝试这样做时遇到错误,我需要帮助确定我做错了什么。
运行应用程序时出现以下错误:
1个页面上的2个错误TypeError:data.findIndex不是函数 DropDownList / _this.renderDropDownWrapper C:/Users/Allan/node_modules/@progress/kendo-react-dropdowns/dist/es/DropDownList/DropDownList.js:83
80 | var focus = _this.state.focused; 81 | var open = _this.props.opened!==未定义? _this.props.opened:_this.state.opened; 82 | var value = _this.value;
83 | var selectedIndex = data.findIndex(function(i){return areSame(i,value,dataItemKey);}); 84 | var text = getItemValue(value,textField); 85 | var valueDefaultRendering = (React.createElement(“ span”,{className:“ k-input”},文本)); 86 | var valueElement = valueRender!==未定义?
在控制台中,此错误显示为:
警告:道具类型失败:
data
类型的道具string
无效 提供给DropDownList
,预期array
。
该错误是有道理的,但是我返回的数据应该是一个数组。不是因为它似乎没有返回任何东西。所以我做错了事。
到目前为止,这是我的代码,请注意,我的数据是从通用存储库提供的。
components / vessels / WidgetData.js
import React, { Component } from 'react';
import { bindActionCreators } from 'redux';
import { connect } from 'react-redux';
import { actionCreators } from '../../store/Types';
import { DropDownList } from '@progress/kendo-react-dropdowns';
class WidgetData extends Component {
state = {
vesseltypes: ""
};
componentWillMount() {
this.props.requestTypes();
}
render() {
return (
<div>
<DropDownList data={this.state.vesseltypes} />
</div>
);
}
}
export default connect(
state => state.vesseltypes,
dispatch => bindActionCreators(actionCreators, dispatch)
)(WidgetData);
components / store / Types.js
const requestVesselTypes = 'REQUEST_TYPES';
const receiveVesselTypes = 'RECEIVE_TYPES';
const initialState = {
vesseltypes: [],
isLoading: false
};
export const actionCreators = {
requestTypes: () => async (dispatch) => {
dispatch({ type: requestVesselTypes });
const url = 'api/KendoData/GetVesselTypes';
const response = await fetch(url);
const alltypes = await response.json();
dispatch({ type: receiveVesselTypes, alltypes });
}
}
export const reducer = (state, action) => {
state = state || initialState;
if (action.type === requestVesselTypes) {
return {
...state,
isLoading: true
};
}
if (action.type === receiveVesselTypes) {
alltypes = action.alltypes;
return {
...state,
vesseltypes: action.alltypes,
isLoading: false
}
}
return state;
};
最后,reducer在商店中定义
components / store / configureStore.js
const reducers = {
vesseltypes: Types.reducer
};
我已经测试过API以确保数据在那里并且可以正常工作,我已经将数据从商店中的Types.js
记录到控制台,并且可以看到返回了。我对Redux的反应非常陌生,因此我尝试在这里找到自己的出路,我们将不胜感激。
答案 0 :(得分:1)
您需要删除以下状态定义,因为您要引用redux存储中的值,而不是本地值:
class WidgetData extends Component {
state = {
vesseltypes: ""
};
然后,在您的代码中,您需要引用redux存储值:this.props.vesseltypes
:
class WidgetData extends Component {
state = {
vesseltypes: ""
};
componentWillMount() {
this.props.requestTypes();
}
render() {
return (
<div>
<DropDownList data={this.props.vesseltypes} />
</div>
);
}
}
您需要更改连接定义:
export default connect(
vesseltypes => state.vesseltypes,
dispatch => bindActionCreators(actionCreators, dispatch)
)(WidgetData);