survey-react出现this.addEvent is not a function报错排查
问题根因
抛出this.addEvent is not a function错误的核心原因是:你调用Survey.Model创建问卷模型实例时,遗漏了new关键字。Survey.Model是构造函数,直接以普通函数形式调用时,函数内部的this不会绑定到新生成的实例对象,无法访问原型链上定义的addEvent方法,直接触发类型错误。
修复步骤
- 修改
src/index.js中实例化模型的代码,补充new关键字,修正后的完整代码如下:
import React from 'react'; import ReactDOM from 'react-dom'; import * as Survey from 'survey-react'; const questions = { elements:[{"type":"comment","name":"If you could enhance one thing about this product, what would it be?","isRequired":true}] }; // 补充new关键字,正确实例化模型 const srv = new Survey.Model(questions); srv.data = {"If you could enhance one thing about this product, what would it be?":"I like it as is, no changes needed."}; ReactDOM.render(<Survey.Survey model={srv} />, document.getElementById('root'));
- 修正
public/index.html的语法错误,你贴的代码末尾</html标签缺失闭合的>,补全后如下:
<!DOCTYPE html> <html lang="en"> <body> <div id="root"></div> </body> </html>
验证说明
你当前使用的survey-react@1.9.33和React 16版本、react-scripts 2.x版本完全兼容,没有依赖冲突问题。修改完上述两处代码后,重新执行npm start启动项目,访问http://localhost:3000即可正常渲染问卷,不会再出现该报错。
内容的提问来源于stack exchange,提问作者learningtech
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