Document is not defined javascript что делать
Node.js document is not defined
Why node.js does not recognize document.GetElementById? It says ‘ReferenceError: document is not defined’. What can I do?
6 Answers 6
document relates to the DOM (Document Object Model) in a web browser.
Node.js, however, is not a browser environment. It is a server environment, much like PHP or Perl, and as such, you can’t access the browser’s DOM or do anything specific to browser-hosted JavaScript.
The closest you could get is using something like browserify to include Node.js modules in your client-side code.
You could use JSDom to add Dom support to Node. To make a variable global you can use either
where html is your website as a string.
To use JSDom include it in your project with:
or in plain js with:
I hope this is answering your question.
To understand the answer, it’s necessary to know the relationship of: Javascript Engine, Browser and Node.js.
Javascript Engine: is Javascript compiler which turns JS into machine code. For example, V8, is a great one. Technically V8 is developed in C++ (you can regard it as a C++ program).
V8 implements ECMAScript, which is a standard of Javascript language defining the features and functionalities of JavaScript.
But DOM operation is not defined by ECMAScript. So V8 doesn’t support it.
Browser: And developers can use document for DOM operation in browser, because DOM operation is provided by browser, for example: Chrome.
Chrome is also developed by C++ and V8(as mentioned abvoe, which is developed by C++ as well) is embedded into Chrome to interpret Javascript. So Chrome expends or adds features to Javascript by binding JS command and C++ implementation together.
Nodejs: different from the Chrome, it is a server side program. But the same thing is that Nodejs is developed by C++ and V8 is embedded into Nodejs to handle js. Nodejs expands features of Javascript in the similar way with Chrome. But since server side doesn’t need to handle DOM, so you can not access such functions inside Nodejs.
Next.js: document is not defined
I am trying to create a payment form where people can pay but I keep getting this error.
I’m using Next.js. Please see my code below:
9 Answers 9
I think, in server rendering mode, the document is undefined. You should be able to use it inside class lifecycle methods or useEffect
To access the document in Next.js you need await the page render first then get it in a variable, like so:
You should read the difference between JS in node.js and JS in Browser. In node.js, you don’t have DOM APIs (window, document, document.getElementById. ), the thing can be only have when your HTML is rendered in a thing called windows of Browsers. So next.js use node.js to run JS code and take result to render HTML file. But in node.js, nothing is windows of Browser.
My English is quite bad. But I hope this answer will be helpful for you.
for me, this error occurs from lots of mistakes: first, you have to use
for every window. and document. and especially for localStorage. functions (my self forgot to use this if clause for localStorage.getItem and the error didn’t fix)
another problem was the import of the line below which was totally wrong!:
For example, when the module includes a library that only works in the browser. Some times dynamic import can solve this issue.
Take a look at the following example:
You have to make sure you have two things setup.
Step 1: create hook isMounted this will make sure that your DOM is rendered.
Document is not defined
I have been trying to implement a login functionality for this website that I am creating. I am able to check whether the user is in the database or not. However, if the user is not in the database I would like to display a message in the form that says; «user not found.» I am trying to use jQuery, but I keep getting the «Document not defined» error.
Code in my js file looks like:
I am very new to web programming and any help would be very well appreciated. Thanks.
1 Answer 1
“JavaScript Reference Error is Not Defined” As mentioned, there are times in which simply defining a variable will resolve the issue. For example, given the example with jQuery above, we can make a call to noConflict() to restore the variable.
But that’s getting beyond the point of this article.
The thing is, simply restoring a variable or giving it a definition especially when it’s related to a third-party dependency is not as easy.
Instead, the problem can usually be resolved in one of two ways.
To fix this, it’s generally a problem of the files being loaded out of order and this is especially true if the error is being thrown in the context of a site or web application that has its own libraries, then the scripts are probably loading later than your own.
This means that either the scripts are placed after yours in the head element of the page or they are being loaded in the footer of the page. If that’s the case, most frameworks and applications provide an API for setting the order in which files are loaded, setting dependencies, and then defining where, in the page, they are loaded.
For example, let’s say that we know that the function in question will be called at two points within the page lifecycle:
When the DOM is ready, and likely when a dependent variable is not defined When the page is loaded and ready, and likely when a dependent variable is already defined. To do this, we can take advantage of variable definitions in JavaScript by doing something like this:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 function acmeReferenceError( valueExists ) < 'use strict';
if ( undefined === valueExists ) <
> view rawreference-error-not-defined.js hosted with ❤ by GitHub Note, however, that we are not checking for whether is the variable is true or false but if the variable is actually defined.
Given that, we can then setup a conditional to do whatever work needs to be done given the presence of the variable or not.
Finally, the way you go about invoking the following function would be like this:
Assuming that you’re calling the function before the value is defined acmeReferenceError();. If you’re calling the function after the value is defined, then you would call acmeReferenceError( foo ); where foo is the value that’s defined. Most likely, the first case will be called when the DOM has loaded, but the page isn’t ready, and the second case will be called when the page has fully loaded and is ready.
The First Is Optimal, the Second Less So When it comes to working with JavaScript, it’s always a better idea to load your scripts in dependent order. With that said, I always recommend the first option as being the proper, more optimal one.
Not only does it work the way ordering of scripts should work, but it requires less documentation and JavaScript-based code because the order of the scripts at the application layer shows – and controls – exactly how things are working.
However, there can be a few times where it’s not possible or something about the environment doesn’t give you the control that you need, and if that’s the case, then the second option is a workable solution.
If you end up going that route, though, I highly recommend including very clear code comments at the function level to explain that the optional parameter is used for, why it’s present, and what aspects of the application necessitate the need for doing something like that.
«document is not defined» in Nuxt.js
I am trying to use Choices.js within a Vue component. The component compiles successfully, but then an error is triggered:
[vue-router] Failed to resolve async component default: ReferenceError: document is not defined
In the browser I see:
ReferenceError document is not defined
I think this has something to do with the SSR in Nuxt.js? I only need Choices.js to run on the client, because it’s a client only aspect I guess.
nuxt.config.js
AppCountrySelect.vue
In classic Vue, this would work fine, so I’m very much still getting to grips with how I can get Nuxt.js to work this way.
Any ideas at all where I’m going wrong?
8 Answers 8
It’s a common error when you start a Nuxt project 😉
The Choices.js lib is available only for client-side! So Nuxt tried to renderer from server-side, but from Node.js window.document doesn’t exist, then you have an error.
nb: window.document is only available from the browser renderer.
Since Nuxt 1.0.0 RC7, you can use element to allow your component only for client-side.
Update:
Since Nuxt >= 2.9.0, you have to use the element instead of :
/plugins/vue-notifications’, mode: ‘client’ > ] I would suggest this for those that are still struggling like I was to find a solution.
/plugins/vue-izitoast’, mode: ‘client’ >
The accepted answer (while correct) was too short for me to understand it and use it correctly, so I wrote a more detailed version. I was looking for a way to use plotly.js + nuxt.js, but it should be the same as the OP’s problem of Choice.js + nuxt.js.
MyComponent.vue
MyChart.vue
Update: There is tag instead of in Nuxt v>2.9.0, see @Kaz’s comment.
You need to add it as a plugin and then disable SSR for it.
As the document and window are not defined on the server-side.
Your nuxt.config.js should look like below
/plugins/client-only.js’, mode: ‘client’ >, // only on client side < src: '
/plugins/server-only.js’, mode: ‘server’ > // only on server side
I had this error with lightgallery.js adding mode: ‘client’ seems helped
I guess this should help, nuxt will touch insides of computed after it renders on server and window will be defined
This thread is a bit old, but I will leave my solution here so maybe someone finds it useful.
I had similar issue with vue-star-rating and few other plugins recently.
Below steps can be followed and adjusted depending on the plugin name, import / usage settings:
Notes:
You do not need to import anything locally to the component, simply using it like above should fix the problem.