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QUESTION
Class based app here.
MainComponent.js
export class MainComponent extends Component {
constructor(props) {
super(props);
this.state = {
name: '',
nr: 0
}
}
btnClicked(e, nr, name){
this.setState({name: name});
this.setState({nr: nr});
}
render() {
return (
this.btnClicked(e, '1', 'one')}>UNO
this.btnClicked(e, '2', 'two')}>DUE
this.btnClicked(e, '1', 'three')}>TRE
{this.state.nr === '1' && }
{this.state.nr === '2' && }
)
}
}
export default MainComponent;
And then here are the 2 child-components:
Child1.js
export class Child1 extends Component {
constructor(props) {
super(props);
this.state = {
name: props.name,
}
}
render() {
return (
{
this.state.name !== '' &&
{this.state.name}
}
)
}
}
export default Child1;
Child2.js
export class Child2 extends Component {
constructor(props) {
super(props);
this.state = {
name: props.name,
}
}
render() {
return (
{
this.state.name !== '' &&
{this.state.name}
}
)
}
}
export default Child2;
When I click to the button "One" I see the text "One". But when clicking on button "Three" I still see the same text "One". I have tried adding forceUpdate but it didnt help:
btnClicked(e, nr, name){
this.forceUpdate(function(){
this.setState({name: name});
this.setState({nr: nr});
});
}
How can I instruct the app to rerender the child component at each click?
ANSWER
Answered 2022-Mar-15 at 16:03In this case you should not assign the Child components prop value to state. Just use the prop value in the component.
export class Child1 extends Component {
render() {
return (
{
this.props.name !== '' &&
{this.props.name}
}
)
}
}
export default Child1;
The Child component's constructor will not be called each time the props update. So, state will not be updated when the props are updated.
In this case - as in most cases - you do not need forceUpdate.
QUESTION
I cannot seem to sort out this challenge. I want the div #project1 to show (visibility, opacity, display) when hover on #img1.
can't find the solution. would really appreciate some help.
Project Title
Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptas amet eaque fuga labore facere rem, voluptatem exercitationem ullam molestiae repudiandae obcaecati minus assumenda distinctio numquam similique deserunt temporibus, odit Lorem ipsum dolor sit amet consectetur adipisicing elit. Provident culpa iste nostrum expedita quam et hic iusto assumenda suscipit maxime, ullam nulla dolores eum sunt error, molestias debitis, quia perferendis?
ANSWER
Answered 2022-Jan-31 at 03:08document.getElementById('img1').onmouseover = () => {
document.getElementById('project1').style.display = 'block';
}
document.getElementById('img1').onmouseout = () => {
document.getElementById('project1').style.display = 'none';
}
Project Title
Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptas amet eaque fuga labore facere rem, voluptatem exercitationem ullam molestiae repudiandae obcaecati minus assumenda distinctio numquam similique deserunt temporibus, odit Lorem ipsum
dolor sit amet consectetur adipisicing elit. Provident culpa iste nostrum expedita quam et hic iusto assumenda suscipit maxime, ullam nulla dolores eum sunt error, molestias debitis, quia perferendis?
You can do that using javascript's onmouseover and onmouseout events
Hope that helps you,
Thank you!
QUESTION
A common pattern in Arduino C++ sketches is the use of Serial.print() or Serial.println() to debug problems.
What is the corresponding Rust idiom when programming for the Arduino Uno?
ANSWER
Answered 2022-Jan-27 at 18:21One technique involves the use of arduino_hal::default_serial! and ufmt::writeln!
For setup:
let dp = arduino_hal::Peripherals::take().unwrap();
let pins = arduino_hal::pins!(dp);
let mut serial = arduino_hal::default_serial!(dp, pins, 115200);
and when you need to print
ufmt::uwriteln!(&mut serial, "{} bytes available", count);
The uwriteln! macro is not as powerful as format! or println! from std. For instance, it does not support {:02x} for integers.
QUESTION
I'd like to use Prism in a WinUI 3 app, and I saw the Prism v8.1 release.
Additionally Prism 8.1 offers a new Prism.Uno.WInUI platform target for those wishing to build either native WinUI3, or Cross Platform WinUI 3 apps with Uno Platform.
I'm confused about Uno. I'm not using Uno, can I still use Prism in a WinUI 3 app without using Uno?
If yes, which packages do I need to install and in which projects? (I'd like to use DryIoc)
I guess Prism.DryIoc.Uno.WinUI must be added to the WinUI 3 app project.
But what about the other packages for using Prism?
ANSWER
Answered 2022-Jan-10 at 12:59If you specifically want to use 'Dryloc', you could try to use one of these Nuget packages:
- Prism.Container.Extensions
- Prism.DryIoc.Extensions
They should both be of general use and not target a specific UI technology.
If you install 'Prism.DryIoc.Extensions' using the Nuget-Package manager, dependent packages should be installed automatically.
See Github - Prism.Container.Extensions
Note there is also a package 'Prism.Core' that does not target a specific UI framework either. If contains features like an event aggregator.
QUESTION
I have recieved a exercice to learn about data types in haskell and I can't figure out how to solve this one.
They got me a data like : data CatLista a = Nil | Unit a| Conc (CatLista a) (CatLista a) deriving Eq and I need to make the data types become: Nil -> [] , Unit x -> [x] , Conc -> same operator as (++)
So if you run Conc (Unit 9)(Conc (Unit 5) (Unit 3)) == Conc (Conc (Unit 9) (Unit 5))(Conc (Unit 3) Nil) should give true and Conc (Unit 9)(Unit 3) == Conc (Unit 3) (Unit 9) should give false.
I already tried instancing the show class like this:
instance Show a => Show (CatLista a) where
show a = case a of
Nil -> []
Unit x -> "[" ++ show x ++ "]"
Conc Nil dos -> show dos
Conc uno Nil -> show uno
Conc uno dos -> "[" + show uno ++ "," ++ show dos ++ "]"
I'm quite new to haskell so I may not know some basics, because I can't understand why if I run it (beeing Conc uno dos -> show uno ++ show dos) with the same command as bellow Conc (Unit 9)(Conc (Unit 5) (Unit 3)) == Conc (Conc (Unit 9) (Unit 5))(Conc (Unit 3) Nil) it still returns False even tough they both return the same [9][5][3] with my show instance.
EDIT
Thanks to you I made it, it know returns correctly the values like intended with this code:
toLista :: Eq a => CatLista a -> [a]
toLista Nil = []
toLista (Unit x) = [x]
toLista (Conc a b)
| a == Nil = toLista b
| b == Nil = toLista a
| otherwise = (++) (toLista a) (toLista b)
instance (Show a,(Eq a)) => Show (CatLista a) where
show a= show (toLista a)
But still I dont know why if I try the same comparation it still returns False, even tough I get returned the same [9,5,3].
This is probably due to my lack of knowledge in Haskell, sorry about that.
ANSWER
Answered 2021-Dec-08 at 20:49Two values are not equivalent if these produce the same String when calling show on these. The (==) :: Eq a => a -> a -> Bool function is implemented by the Eq typeclass. You thus need to implement the instance of Eq for your CatLista yourself.
The default implementation for Eq, if you use deriving Eq is that two values are the same if they have the same data constructor, and the parameters are elementwise equivalent by calling (==) on these.
You thus can implement the instance for Eq yourself with:
data CatLista a = Nil | Unit a| Conc (CatLista a) (CatLista a) -- ← no deriving Eq
instance Eq a => Eq (CatLista a) where
ca == cb = toLista ca == toLista cbQUESTION
ANSWER
Answered 2021-Nov-21 at 11:57The problem is you are using spaces in the project name. Uno does not currently support this.
I also strongly discourage the use of spaces in the name for any other C# projects to avoid unnecessary problems. The standard C# naming contains a dot, for example: Ryder.Display or simply RyderDisplay.
QUESTION
In the last years i have developed a huge amount of .NET Framework (4.8) Classes with functions and methods for my applications. Most if this apps are commandline apps. A few apps are WPF or Winform-Apps.
Now I want to start with Apps they run in browser. I try to use "Blazor", but the need .NET CORE or .NET STANDARD - and they cann´t use projects/classes from ".NET Framework".
My Question: If i use uno-platform only for UI, can I use/reference to ".NET Framework" Projects oder Libraries? Or have it the same limitation like Razor-Apps?
ANSWER
Answered 2021-Oct-29 at 09:10Uno Platform in the browser and Blazor share the same underlying .NET WebAssembly runtime, so they have the same limitations in this regard. If you want to use older code you'll need to recompile it, and you won't have access to .NET Framework-only APIs.
QUESTION
I'm trying try get my Arduino code to compile with -std=c++14 instead of the default -std=gnu++11. To this end, I added to my platformio.ini:
build_flags = -std=c++14
build_unflags = -std=gnu++11
However, when I then try to compile, I get the following linker errors:
:(.text+0x20a4): undefined reference to `operator delete(void*, unsigned int)'
(multiple times)
I seems that the delete operator is missing. I found some threads about adding it manually, which appears to be used to be necessary in the past with Arduino. However, this shouldn't be the case anymore, and with the default gnu++11 I do not have this issue. Why is this missing with c++14 (and later standards and their GNU extensions) and not with the default gnu++11?
I only have this problem with avr-gcc (for Arduino Uno), with arm-none-eabi-g++ (for Teensy), this problem does not occur.
ANSWER
Answered 2021-Oct-05 at 09:43After some searching around it turns out that C++ from C++14 on defines two additional delete operators:
void operator delete ( void* ptr, std::size_t sz ) noexcept; (5) (since C++14)
void operator delete[]( void* ptr, std::size_t sz ) noexcept; (6) (since C++14)
5-6) Called instead of (1-2) if a user-defined replacement is provided, except that it's unspecified whether (1-2) or (5-6) is called when deleting objects of incomplete type and arrays of non-class and trivially-destructible class types. A memory allocator can use the given size to be more efficient. The standard library implementations are identical to (1-2).
(from https://en.cppreference.com/w/cpp/memory/new/operator_delete)
Looking at ArduinoCore-avr's source, these are actually present, and defined as follows:
#if __cplusplus >= 201402L
void operator delete(void* ptr, std::size_t size) noexcept {
operator delete(ptr);
}
void operator delete[](void * ptr, std::size_t size) noexcept {
operator delete[](ptr);
}
#endif // __cplusplus >= 201402L
However, it seems like there hasn't been a new release of ArduinoCore-avr in a while, and the last release predates this (relatively recent) code.
After adding the above definition to my code myself, it compiles :)
QUESTION
I created these cards in pure css and html I don't want to use javascript, but I don't understand why it doesn't work for me can you help me solve this problem of mine? thank you
.tabs {
display: flex;
flex-wrap: wrap;
}
.tabs label {
order: 1;
firstdisplay: block;
padding: 1rem 2rem;
margin-right: 0.2rem;
cursor: pointer;
background: #f9f9f9;
font-weight: bold;
transition: background ease 0.2s;
border-radius: 15px
}
.tabs .tab {
order: 99;
astflex-grow: 1;
width: 100%;
display: none;
padding: 1rem;
background: #fff;
}
.tabs input[type="radio"] {
display: none;
}
.tabs input[type="radio"]:checked+label {
background: #fff;
border-bottom: 1px solid #e2e2e2;
}
.tabs input[type="radio"]:checked+label+.tab {
display: block;
}
@media (max-width: 45em) {
.tabs .tab,
.tabs label {
order: initial;
}
.tabs label {
width: 100%;
margin-right: 0;
margin-top: 0.2rem;
}
}
.tabp {
line-height: 25px;
text-align: left;
padding: 5px;
font-size: 15px;
}
```
-
Tabella Uno
-
Tabella Due
-
Tab Tre
Description
Lorem ipsum dolor sit amet, consectetur adipisicing elit.
Specification
Lorem ipsum dolor sit amet, consectetur adipisicing elit.
Reviews ( 2 )
Lorem ipsum dolor sit amet, consectetur adipisicing elit.
ANSWER
Answered 2021-Aug-16 at 14:33You need to put radio inputs above tabs (you can hide them), so you can select tabs, also use id's for showing particular tabs:
.tabs {
display: flex;
flex-wrap: wrap;
}
.tabs label {
order: 1;
display: block;
padding: 1rem 2rem;
margin-right: 0.2rem;
cursor: pointer;
background: #f9f9f9;
font-weight: bold;
transition: background ease 0.2s;
border-radius: 15px
}
.tab {
order: 99;
flex-grow: 1;
width: 100%;
display: none;
padding: 1rem;
background: #fff;
}
.tabs input[type="radio"] {
display: none;
}
.tabs input[type="radio"]:checked+label {
background: #fff;
border-bottom: 1px solid #e2e2e2;
}
/* ADDED */
input[type="radio"] {
display: none;
}
#tabone:checked ~ .tab-content #tabone,
#tabtwo:checked ~ .tab-content #tabtwo ,
#tabthree:checked ~ .tab-content #tabthree {
display: block;
}
@media (max-width: 45em) {
.tabs .tab,
.tabs label {
order: initial;
}
.tabs label {
width: 100%;
margin-right: 0;
margin-top: 0.2rem;
}
}
.tabp {
line-height: 25px;
text-align: left;
padding: 5px;
font-size: 15px;
}
-
Tabella Uno
-
Tabella Due
-
Tab Tre
Description
Lorem ipsum dolor sit amet, consectetur adipisicing elit.
Specification
Lorem ipsum dolor sit amet, consectetur adipisicing elit.
Reviews ( 2 )
Lorem ipsum dolor sit amet, consectetur adipisicing elit.
QUESTION
I have a database with this structure
table_translations
name cat text_en text_es text_pt text_fr item1 01 one uno un un item1 02 one_B uno_b un_b item2 01 two dos dois deux item3 01 one uno item4 01 four quatretable1_items
name cat column1 column2 column3 item1 01 c-1 c-2 c-3 item3 01 c-1 c-2 c-3table2_items
name cat column1 column2 column3 item1 01 c-1 c-2 c-3 item2 01 c-1 c-2 c-3With this query I get the translations for each table_items (there are several table_items):
SELECT *
FROM table1_items, table_translations
WHERE table_translations.name = table1_items.name
AND table_translations.cat = table1_items.cat;
However, I would like check if the translation_"language" is empty, then select the value from translation_en. Is that possible?
name cat column1 column2 column3 text_en text_es text_pt text_fr item1 01 c-1 c-2 c-3 one uno un un item3 01 c-1 c-2 c-3 one uno one oneANSWER
Answered 2021-Aug-13 at 13:22Hmmm . . . you can use coalesce():
SELECT i.*,
t.text_en,
coalesce(t.text_es, t.text_en) as text_es,
coalesce(t.text_pt, t.text_en) as text_pt,
coalesce(t.text_fr, t.text_en) as text_fr
FROM table1_items i JOIN
table_translations t
ON t.name = i.name AND t.cat = i.cat;
If NULL can mean the empty string, then you can use NULLIF():
SELECT i.*,
t.text_en,
coalesce(nullif(t.text_es, ''), t.text_en) as text_es,
coalesce(nullif(t.text_pt, ''), t.text_en) as text_pt,
coalesce(nullif(t.text_fr, ''), t.text_en) as text_fr
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