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QUESTION
So, I have 8 different components which contain data about 8 categories of products (pc components), which obviously have different values in the description (core count, etc.).
Those 8 components only contain the specific data (processor contains core count, but does not contain price - every component has a price irrespective of category)
In product.jsx, I want to render one of the 8 components depending of the categoryName, which I get by calling a function I define in the component's body (getCategory). However, for some reason, the getCategory function is never evaluated, no console.log is ever printed in the console from that function.
Just to point out, if I just render < Processor />, the data is displayed, and if the comparation for the 1st is "processor"==="processor" (always true), then the data is again displayed.
I think my error is in react logic. Somehow I am missing something on how react renders stuff. Can you please spot the error in my use of React. Thank you!
Below you will find the code of the component in question, but a full repo can be found here: https://github.com/vradu007/radu-shop
...ANSWER
Answered 2020-Nov-10 at 23:41As it is currently written, your getCategory function "returns" undefined, since it has no return statement, and there is no implicit return because you are using {}. It should be called, it just doesn't return anything from the inner loop.
Also note that forEach does not have a return value, so you need to rethink how you find the inner category (and not use forEach). If appropriate I would also recommend that you set the result from getCategory to a variable and switch over that, as to not calculate the category value multiple times in your render.
One way of doing this is by using the useMemo hook instead, and skip the getCategory function. Instead of using the forEach function, simply using a for loop instead lets you return something from the inner loop.
QUESTION
I have a webpage with two select menus, one input, three buttons, and a checkbox. Everything is added and manipulated by JavaScript. On page page load, there is an object initiated with no values ( either value correspond either one of select or input ). You can select values and update it ( target is array of objects ) in array. Then, you can choose one of the buttons to copy selected options. Each object has three value (copying means that you copy the segment containing those values) times as many as you typed in input. After that, all objects are shown on screen. You can click a button to check all checkboxes and all objects change value. Value is updated in all selects of changed type and in the corresponding array. Now my problems begin. When you unselect all checkboxes and want to change only 1 object all objects are updated and I have no idea why. There are conditions to check for each object if the checkbox is unchecked. If a single object is updated (either select or input) all of the other objects are updated ( none of checkbox is checked). Here is github link to this project to check everything out without problems. Also one more thing... whenever I update all values handleDOMChange function should fire automatically, but as you can see I have to fire it up manually so the changes are "visible" on my target array
...ANSWER
Answered 2020-Oct-11 at 20:49All right, I've found the answer. The reason it didn't work is that handleManySegmentsChange function is going to be fired in one circumstance - if user changes many select values at once. But this cannot be the case. My solution to the problem is to detect one change in segment, check for checkbox value, pass it to the function and depending on the checkbox value either update one value or all of them. Like so:
QUESTION
I just wonder if it's possible to make it better (and I guess there are many, many better ways to do it). So the question is how to return true if in my list are 4 types of components. My list may contain 1000 of them , but I just need to return true if there are 4 objects of different types (CPU, GPU, RAM, PowerSupply). These objects are children of abstract class Component and contain property of enum type.
...ANSWER
Answered 2020-Sep-09 at 12:20I think it is readable:
QUESTION
I work with SQL Server 2012 and face an issue: I can't display Text Unit only one time where it repeated for feature using Stuff.
What I need is when Text Unit is repeated for same feature, then no need to repeat it - only display it once.
In my case, I face issue that I can't prevent repeat Text Unit when It be same Text Unit for same Feature.
Voltage | Voltage | Voltage ONLY one Voltage display .
...ANSWER
Answered 2020-Jun-29 at 07:44To put this into a complete answer - this should be your SQL (shortened slightly and removed the last temp table):
QUESTION
I'm writing a script to go through a bunch of email alerts for a backup system.
I need to target the server name.
I've already written a script that can parse through my outlook.
The expected input is:
Server-DC Error 1:04:34 AM 1:00:12 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 Incremental copy was not processed during the copy interval
Server-DC2 Error 1:05:30 AM 1:00:12 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 A server caught on fire
ABCDEFG Error 1:06:26 AM 1:00:12 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 Someone cried into the powersupply and now the server is offline
EXCH2019 Error 1:07:29 AM 1:00:12 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 Backup failed because it felt like it
SBS2003ISBAD Error 1:08:40 AM 1:00:12 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 Backup failed because someone thought backup software was malicious
ANCIENT-DB Error 1:09:49 AM 1:00:12 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 Windows forced an update during backup window
FILESERVER Error 1:10:54 AM 1:00:13 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 I'm running out of ideas to anonymize this data
VM4EVRYTING Error 1:12:11 AM 1:00:13 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 Why are you still reading these
WEBSERVER Error 1:13:19 AM 1:00:13 AM (+1) 0.0 B 0.0 B 0.0 B (1x) 0:00:00 I get hundreds of these a day I'm only showing you 9
I need to target the server name, which is ALWAYS before "Error"
I've got:
...ANSWER
Answered 2019-Aug-05 at 20:13You could use a capturing group from the start of the string and capture until the first occurrence of a space and Error followed by a space.
QUESTION
I have the simple context class definition:
...ANSWER
Answered 2018-Sep-27 at 12:51It calls the constructor of the base class. So it is not empty. It just doesnt add something new.
There are many reasons you could use that "empty" constructor.
You may not have any new properties, or you instantiate those properties somewhere else (i dont recommend)
You may just want to add functionality (new methods) so you extend the class, and implement new methods using the properties and methods of base class. So you dont need the constructor to do something new, opposed to the base class.
Or it has many constructors, and you use the empty constructor in circumstances you need to use limited functionality of the class, or default values.
QUESTION
When creating a new class or method I used to be able to see the parameters needed. But, now they don't come up anymore. How do I view parameters when creating a class?
Running the latest windows version.
...ANSWER
Answered 2019-May-27 at 05:11Nevermind in order to see the parameters as you type you must type them while in the editor without moving your cursor.
QUESTION
ev3dev stretch version 14 April 2019 downloaded from here...
https://github.com/ev3dev/ev3dev-lang-python
Running this python script to see what is happening with power on my ev3dev. Works apart from the commented out code, which reports as unknown variables?
What should this read?
...ANSWER
Answered 2019-Apr-14 at 15:32You don't have measured_voltage and measured_current variables defined. Try this:
QUESTION
So I am trying to run and learn all about the vishnubob/kinet api.
After I download it I try to run the example script (also after fixing a couple syntax errors) I get this error:
...ANSWER
Answered 2018-Oct-21 at 18:18The clue here is "fixing syntax errors". That code has been written for Python 2, and it uses a thing called implicit relative import which was removed in Python 3. Namely the line in kinet/__init__.py
QUESTION
My View Model is:
...ANSWER
Answered 2018-Oct-07 at 15:12That's probably because your MobileNo list has no data values when CompanyAccountViewModel was returned to the view.
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