如何使用reactjs通过window对象将应用程序变量传递到控制台？

Question

 window.pageDataLayer.userFeedback.firstName = user ? (user.firstName ? user['firstName'] : '') : '' window.pageDataLayer.userFeedback.lastName = user ? (user.lastName ? user['secondName'] : '') : '' window.pageDataLayer.userFeedback.DOB = user ? (user.DOB ? user['DOB'] : '') : ''

× TypeError: Cannot read property 'userFeedback' of undefined

How to save the application parameters to window objects.

Answer 1

You'll have to create the pageDataLayer -Object first. Right now you are trying to access the object userFeedback of the object pageDataLayer - which does not exist.

Also, there is no difference between accessing the user properties with dot-notation or in square bracktes ( user.firstName is the same as user['firstName'] ) so you can omit the duplicate ternary operator there.

Lastly, and only in case your user object is on the global scope, you will get an error with your syntax if it does not exist - so you should access it with window as well.

So all in all, this should do the trick:

 window.pageDataLayer = { userFeedback: { firstName: window.user ? user.firstName : '', lastName: window.user ? user.lastName : '', DOB: window.user ? user.DOB : '' } } console.log(window.pageDataLayer);