I need to know if there is any way in WeChat miniprogram to do stopPropagation to a bubbling event from typeScript.
According to official documentation: in Chinese, in English it is through the "Event Capturing" clauses but I would like to know if there is another way to do it, as angular does it.
Related
I am developing a Chrome extension that adds a custom devtools panel. My panel has some text boxes that allow user input, but any time I type a question mark, it opens Chrome help instead of tying the '?' character. Is there a way to stop this behavior?
UPDATE:
I should have mentioned that I'm using React in my extension and that I was using React's synthetic events.
This turned out to be unrelated to Chrome and due to a React JS nuance.
I was trying to call event.stopPropagation() on a React synthetic event which doesn't actually stop propagation to non-react registered event handlers such as the one that opens the help dialog.
The fix was to register a keydown event to the native DOM element and calling stopPropagation on the native event. This properly stoped the help menu from opening in response to typing in my input.
e.g.
<input
ref={input => input.addEventListener(event => event.stopPropagation())}
onChange={this.myOnChangeHandler}
/>
In an attempt to automate some web/browser tasks with golang I reached a barrier when if comes comes to click, touch and swipe interaction.
Thanks to the amazing https://github.com/PuerkitoBio/goquery library I am able to parse webpages and I am able to interact with form sheets.
One integral part that is missing to automate pates is simulating mouse clicks that trigger javascript.
How would it be possible to implement this in golang? Do I need to simulate OS level mouse clicks or do browsers have an API that I can use?
You would need to use something like Selenium's WebDriver which has at least one go client
Now I'm developing windows phone 8.1 app with WinRT
I'm trying to support swipe-right-to-go-back gesture in my app.
I try to capture the manipulation events on my page. My page's root is a grid and have a ListView inside. I used the UIElement.AddHandler method with "handledEventsToo=true" to add the event handlers. But when I touch the screen, only the ManipulationStarting event is fired, other events seems to be eat by listview.
Could anyone tell me about the manipulation event behavior or other methods to implement this feature? Thanks!!
You won't normally capture events on LisView, beacause it has a ScrollViewer which intercepts them.
There is a way to do it - you will have to disable ScrollViewer and then perfrom some actions when the events are fired and perform scrolling manually. This answer will guide you.
In case someone encounters this page, I spent the better part of a week figuring out why manipulation events were only firing half the time on my UWP charts using the winRT xaml toolkit.
You may need to check that the background is not null on whatever element has the event handler attached. Templated controls are not necessarily hit test visible unless they have one. Otherwise, the input can go right through to the element behind it.
https://msdn.microsoft.com/en-us/windows/uwp/xaml-platform/events-and-routed-events-overview
Does GWT provide any way to define click handlers for when the user clicks the back/forward browser buttons? If so, how could I define such handlers? If not, why?
No, You cannot do that with GWT. However, you may use the History Token to manage the URL changes
take a look here GWT MVP
they explain very well how to implement a such behavior ( using History tokens). hope it helps.
I try to use the perl script to automate the interaction with a website.
I use module WWW::Mechanize to realize my design. But I cannot perform the button click in my perl script by using command as below.
$mech->click( $button [, $x, $y] )
$mech->click_button( ... )
It is because this button does not belongs to any form and without name, I can not call or locate this button in my perl script. How can I make it possible to click this button in my perl script like I interact with browser? Thank you.
<button class="button transactional" id="checkout-now"><span>Check Out Now</span></button>
If button does not belong to any form it should have onclick event defined, like #Bilzac and #hijack mentioned. In this case you are not able to reproduce browser's behavior because WWW::Mechanize does only html analysis.
Dealing with JavaScript events it's more easy to implement browser's network activity rather then implementing whole JavaScript events and DOM interaction.
Well sometimes all you need is $mech->post() because it's harder to find what going on with JavaScript when you click some element.
So you need to find what request is performed when you click this button (you may use Firefox HttpFox for this) and after that construct same request using WWW::Mechanize:
$mech->post($request_url, Content => {FORM_FIELDS...});
You can add onclick event on this button. like this:
<button onlick="alert('hello');">Click Me</button>
Clicking the button in a browser only runs a piece of JavaScript. You can't do that in WWW::Mechanize, because it has no JavaScript support.
What you could do, however, is find the JavaScript code that's being run when the button is clicked and write some Perl code to do the same thing. Unfortunately, it can sometimes be hard to find which JavaScript event handlers apply to an element. Even the otherwise excellent Firebug doesn't seem to have any simple way to list all event handlers associated with an element. (There does exist an Eventbug extension, but at a glance it doesn't seem to work very well.) The Visual Event bookmarklet might also be worth trying.
I am not 100% sure what you are asking for, but I am going to swing at it.
You do not need the button to be part of a form for any sort of interactivity. You can do this with just JavaScript & HTML.
$('#checkout-now').click( function() {
alert('Hello!');
//Do other stuff here, regarding the form! (Call Perl scripts etc.)
});
http://jsfiddle.net/fCdxR/1/
Quick example of how it works!
Hope this solves your problem.