First of all, i need to create a cookie with a values that are in a form, and a lot of values are in a radio input type, but i ran into a problem with creating it. Here is the code: i got the code for all the functions from tutorialrepublic.com except the last one, which i made on my
Tag: null
How to drop null elements but not undefined when using `arr.flatMap((f) => f ?? [])`?
I’ve written a function that removes null values from an array: For example: However, I realized that it also removes undefined values. Is there a way to just tweak the current dropNull() in order to remove null but not undefined? That is, I know I could have re-written the function as: But I like the arr.flatMap((f) => f ?? [])
Give empty input values a value only when they are empty/null, when a response function is executed in JavaScript
Otherwise, I want their original value. Basic desired outcome: For this example, type a name to see the result. Erase the name and I want it to say “[empty]” instead of the name (in the text below the field). If I type the name again it should show the name again. I am using “span” in a larger program so
How can I set Date object to null in Javascript?
I am trying to set check_date to null I tried but none of them are working for me. How can I achieve this? Code Answer You can’t set a Date to null. Date is an an embedded JavaScript type. Setting date to new Date(0) just sets it to Unix Epoch. You can, however, set a variable to null. This should
checking for null in javascript
I have the above if-else-if chain in the code, trying to see if I can write the same logic in one or two lines. Answer Since you want to distinguish between three types of values, you have to make at least two checks already. The else case will never be hit since either !valid or valid will be true. That
Error in getting Value from Input Radio button
I am using Firebase Realtime Database to upload values of selection of the radio buttons. I have tried getting value of radio button with all the solutions provided in this question :How to get value of selected radio button? but it shows error in all three types I have tried. I can’t figure out the problem. I have set up
getElementById in React
Getting this error at the moment: Uncaught TypeError: Cannot read property ‘value’ of null I call this in my render function below: I also have tried calling it in here How can I get the id of an input text field and read that value and ensure it is not null? I think the DOM is loading after I try
How to resolve TypeError: Cannot convert undefined or null to object
I’ve written a couple of functions that effectively replicate JSON.stringify(), converting a range of values into stringified versions. When I port my code over to JSBin and run it on some sample values, it functions just fine. But I’m getting this error in a spec runner designed to test this. My code: The error message I’m getting from the tester
WebGL – cannot reader property createShader of null
I am following a book called professional WebGL, I am hand writing stuff making sure of my understanding, I have this code: for some reason, it says that it can’t read property null for createShader here: shader = gl.createShader(gl.VERTEX_SHADER); But it doesn’t complain at all for the same declaration but with the fragment shader. Answer Slightly changed version. gl.celar was
How can I determine if a variable is ‘undefined’ or ‘null’?
How do I determine if variable is undefined or null? My code is as follows: But if I do this, the JavaScript interpreter halts execution. Answer You can use the qualities of the abstract equality operator to do this: Because null == undefined is true, the above code will catch both null and undefined.