Typeerror cannot read property returnvalue of undefined
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I don't know why, everything seems correct, this is an assignment which is part of an online course and I've seen corrections made by other people who did the course and they seem to be doing the exact same thing as me and it works for them.
So you can add a check for undefined so that the. That is what this. Essentially it means if this. After setState is complete, this. To avoid any props undefined value, you can use the library prop-typeswhere you define your props default values, so that if the props value is not transferred to your component, your component will still have a default value to behave as expected.
It's useful in the case where your props are not defined from the very start for example which is probably the case here. Learn more. How to solve TypeError: Cannot read property 'map' of undefined? Ask Question. Asked today.
Avoiding those dang cannot read property of undefined errors
Active today. Viewed 44 times. Output : App. Anurag Srivastava 8, 3 3 gold badges 15 15 silver badges 33 33 bronze badges. Amine Amine 1 1 silver badge 11 11 bronze badges. By making sure this. In your Menu constructor, if you do console. Can you try this. Active Oldest Votes. Anurag Srivastava Anurag Srivastava 8, 3 3 gold badges 15 15 silver badges 33 33 bronze badges. Orlyyn Orlyyn 4 4 silver badges 13 13 bronze badges.
Hello, what do you mean by it didn't work? What did you try, what errors did you get? Sign up or log in Sign up using Google.
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Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Triage needs to be fixed urgently, and users need to be notified upon….Learn Development at Frontend Masters. Could be an empty state from an API that returns differently than you expected. Could be something else.
If you are not using a utility library, read on! The value produced will always be the value of one of the two operand expressions.
Otherwise, the second expression will be used. However, when accessing deeper objects, this can be quite verbose. If it is, it will attempt to access the next property on an empty object. In the example above, favorites.Binding r xsr to jumper t16
On deeper objects, this can be quite a significant advantage. The primary disadvantage would be readability — it is not a common pattern, and may take a reader a moment to parse out how it is working. They do not evaluate to a value as they do in some languages.
As long as properties are wrapped in a function, they are safely accessed. A default value can also be specified in the case of a non-existent path. If you are not from the future, however, there are more considerations to take into account.
I was thinking of blogging about this exact thing recently, after my colleague and I spoke about. We got tired of short circuiting.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I am using the cloudinary-react library and have run into the following error message when I add the Image component to my project:.
Could it be that this is CORS issue and causing this error to appear? I'm not entirely sure what this is saying. Component wihtout importing 'react' somewhere. I had never thought of Component meaning React. Component but I'm thinking that is not the case unfortunately.
I did check the import on the cloudinary-react library to make sure deconstructing was the correct manner of import and that is correct. You can find the rest of the code here should you want to look at it all:. I have done quite a bit of experimenting and still am receiving the same error message from next.
Even in the simplest example I could create using their demo data I still receive the same error. I believe the issue just from the error messages is a Next. Same issue with Draft. Thanks for mentioning that this is not just an issue between the tech I'm using and Next. Are you getting the same exact error messages?
I'm curious after doing some research on what I'm working with in the cloudinary-react library if the issue is stemming from what they have done by building a CloudinaryComponent as a class based component. They then use this in place of Component when building the components used in the library:. I opened a quick repo using create-react-app and this error is not present the way it is in Next. So I roughly feel the issue does reside inside the Next.
I'm grasping at straws because the majority of the source code is pass my comprehension at this point; but with the error referring Cannot read property 'Component' of undefined I have to believe this could be the issue. I would definitely like to get in on finding a fix for this since it is effecting more than just the tech I am using.
I am still quite new never worked a job doing this yet and the JS behind the scenes is a few black belts ahead of this ninja-in-training. When loading the Page doRender is being called multiple times. In the first and second? That's when you can observe the picture showing up. Now the next time doRender is called Component is undefined and with lastAppProps being undefined  —and therefore not having a property Component  —results in the TypeError.
Why doRender is being called multiple times and Component is undefined I haven't figured out yet. Thanks for the in depth explanation of the code. I kept being lead back to doRender ; but was struggling to understand the logic. I'm starting to see what you mean by the Component being undefined. Below is a screenshot from Chrome for what those console. I have a workshop to attend but will comeback to this after noon CST to continue searching for where the disconnect is. Thanks again for the explanation of the code!GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. If you're using the Router from react-router not a BrowserRouter or HashRouter from react-router-domyou need to configure it with a history instance. I'm using BrowserHistory and when wrapping in withRouter get the same error. Any ideas?
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The error most often than not is faced when the scripts come across uninitialized variable or object. If you get undefined error, you need to make sure that which ever variables throws undefined error, is assigned a value to it. Catch Before It Happens. So many times developers are tempted to use this feature, even though it not a very good practice.
So if you are a developer that is addicted to not initializing the variables, you can at least attempt to catch the problems before they happen through simple statement. Hope this solves a bit of your problem. If you face any error or have alternative to this one, let us know in the comment section below. Originally published at lambdatest. Sign in. Sarah Elson Follow.
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If the issue you are interested in, can be still reproduced in the latest version of CKEditor, feel free to report it again on GitHub.
At the same time please note that issues reported on this website are still taken into consideration when picking up candidates for next milestones. Opened 4 years ago. Closed 4 years ago. Currently I am using ckeditor version 4. Code is as below. Its working fine in firefox. But problem with ie and chrome. Download all attachments as:. But cannot insert characters, symbols, numbers. Its like empty box. Since I can't reproduce this issue, you are getting it only sometimes and you are getting it with your custom widget implementation, it really looks like implementation issue and not ckeditor bug.
Because of that I need to close this issue as invalid for now. Powered by Trac 1. Opened 4 years ago Closed 4 years ago. Description Currently I am using ckeditor version 4. Oldest first Newest first Threaded. Show comments Show property changes. Please provide more detail as I could not reproduce it.
I have tried your code and it works ok but there is also a call to afterSetData which is your custom method and may cause the problem. When exactly does this error occur - on load or there is some specific scenario. Please provide detailed steps to reproduce it.Steam engine impact on britain
Please try reproducing this issue in default standalone CKEditor outside of your application in order to exclude influence of e. Changed 4 years ago by sweta. Thanks for your quick reply.
I have tried your basic. Still no luck. Note: See TracTickets for help on using tickets. All rights reserved.
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