I keep seeing this $am() function calling in jq.ui.js, but I can't find the definition anywhere...what does this function do?
It's in jq.ui.js at the bottom. It's just a wrapper to document.getElementById() that was used in aUX (jqUi was derived from this, which was before the query selector library was written).
Related
The component that I have testing renders something this:
<div>Text<span>span text</span></div>
As it turns out for testing the only reliable text that I have is the 'span text' but I want to get the 'Text' part of the <div>. Using Jest and react-testing-library I can
await screen.findByText(spanText)
This returns an HTMLElement but it seems limited as I don't have any of the context around the element. For example HTML methods like parentNode and previousSibling return null or undefined. Ideally I would like to get the text content of the parent <div>. Any idea how I can do this with either Jest or react-testing-library?
A good solution for this is the closest function.
In description of closest function is written: Returns the first (starting at element) including ancestor that matches selectors, and null otherwise.
The solution would look like this:
screen.getByText("span text").closest("div")
Admittedly, Testing Library doesn't communicate clearly how to do this. It includes an eslint rule no-direct-node-access that says "Avoid direct Node access. Prefer using the methods from Testing Library". This gives the impression that TL exposes a method for a situation like this, but at the moment it does not.
It could be you don't want to use .closest(), either because your project enforces that eslint rule, or because it is not always a reliable selector. I've found two alternative ways to tackle a situation like you describe.
within():
If your element is inside another element that is selectable by a Testing Library method (like a footer or an element with unique text), you can use within() like:
within(screen.getByRole('footer')).getByText('Text');
find() within the element with a custom function:
screen.getAllByText('Text').find(div => div.innerHTML.includes('span text'));
Doesn't look the prettiest, but you can pass any JS function you want so it's very flexible and controllable.
Ps. if you use my second option depending on your TypeScript config you may need to make an undefined check before asserting on the element with Testing Library's expect(...).toBeDefined().
But I have used HTML methods a lot and there was no problem yet. What was your problem with HTML methods?
You can try this code.
const spanElement = screen.getElementByText('span text');
const parentDiv = spanElement.parentElement as HTMLElement;
within(parentDiv).getElementByText('...');
I can not understand what it exactly does according to the documentation.
This documentation is not detailed enough.
Is there an example?
The documentation isn't that deep because what this does isn't that big of a deal, all that this decorator does is create a "shortcut" of sorts for calling querySelector on the element's root (be it this.shadowRoot if you're using shadow dom or this if you're not)
So basically this TS code:
#query('.someClass')
private _someClassElement: Element
is the same as doing this in JS
get _someClassElement() {
return this.shadowRoot.querySelector('.someClass');
// or this.querySelector('.someClass') if you're not using shadow dom
}
I would like to check if a mixin has been applied to a custom element, but I don't think I can use 'instanceof', since a mixin is not properly a base class (I tried, of course).
I would need to enforce that an element added to a collection can be only of a kind with a particular class mixin applied...
Any suggestions?
Not sure I understand you question correctly.
I assume you want to check something like MyCustomElement has already apply MyMixin or not?
You can check from the instance
let instance = new MyCustomElement()
console.log(instance instanceof MyMixin)
This will only work when MyMixin is a class not a factory function. If you follow documentation you need to change it.
Another way, you can declare some static function in MyMixin. Then you can call from MyCustomElement to check it.
I tried to find on Primefaces Documentation but I have not found how can I customize the filter function for SelectOneMenu.
I add filterMatchMode="custom" filterFunction="#{mainRandevuBean.ilFilter()}"
But I don't know how can I write bean filterFunction.
The filter is a javascript (client-side) function. It all IS in the PrimeFaces documentation, which you should always look into first, carefully, thouroughly.
So use filterFunction="myFilter"
and create a javascript function like
function myFilter(itemLabel, filterValue) {
// return true if this label matches, false otherwise
}
Just as a sidenote: primefaces documentation doesn't say anything semantically about the parameters. It also does not mention where the label comes from (in fact, the docs mention "the item value" which is not very clear).
In fact I used the JavaScript function to debug this in order to figure out what was provided by default as a label.
function filterList(label, filter){
alert("label="+label+" and filter="+filter);
return false;
}
At first I thought it would be anything like the text inside the HTML generated for each list item. But when debugging it I saw the alert said that the label was something like my.package.SomeValueObject#123456 (which is obvously the Java object toString on each item in the list).
You need to define the itemLabel property on the selectItems which is inside the selectManyMenu to generate a proper text value used by the standard filtering mechanisme. As far as I could figure out that is the only reason why you have to put itemLabel there. In the documentation itemLabel is specified before explaining filtering which is confusing.
And as far as I know the itemValue defaults anyhow to just the object value, so I believe following from the documentation is redundant.
itemValue="#{player}"
Hope it helps anyone :.)
I resolve this problem with autocomplete component. Primefaces autocomplete component with dropdown="true" property works like one menu.
If im usin function to add a mc to the stage like so:
var myChild:MC= new MC();
function somefunc()
{
stage.addChild(myMC)
}
but when I try to remove the mc by:
stage.removeChild(myMC)
I get The supplied DisplayObject must be a child of the caller error...
any suggestions or work arounds?
Your code should work if the item is on the stage. Perhaps qualifying it with a conditional statement like so:
if (myMC.stage != null)
stage.removeChild(myMC);
Alternatively you could use the following code but it is probably not best practice.
if (myMC.parent != null)
myMC.parent.removeChild(myMC);
The problem is not with removeChild. It's with the displaylist. If you check the parent property of the displayobject, when you call "removeChild" it will be null.
Why does it become null could be because of lots of reasons:
Parent is nulled before the child.
The child or parent have event listeners that won't let them die.
The Display Object is really not the instance you're trying to remove. THIS one can be very tricky to find out. Look at the "name and parent properties" of the variable you're trying to remove while calling removeChild.
You could try hiding and showing the movieClip, if possible.
I think its a bit faster than removing and adding consistantly, code permitting.
Keep in mind this is just a suggestion, someone smarter than me outta be able to help you out..
You could also use this fail safe:
if(myMC.parent) myMC.parent.removeChild(myMC);
I could fix this problem by simply removing every EventListeners I added to that object before removing it.