React Full Calendar disable header button - reactjs

I added a custom button to my header to 'undo' actions in my calendar. It is working fine, but I cant find out how to disable my custom button when there are no events in my action history.
For now, I just skip my actions in the handler, but I want to customize my button to LOOK disabled.
There seems to be, since full calendar implements a disabled button for 'previous month', as shown in the example.
Is there any way I can achieve this?
I'm using full calendar v4.

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Fullcalendar Event Drop in modal not working

I have problem with editable fullcalendar eventdrop in modal dialog if another FullCalendar is in background. Modal with second calendar open after click on event in first calendar. But I need moving with event with calendar in modal view, but its not working when the first calendar is in background. Can you take me some solution? Its probably a css bug of FullCalendar.

How to disable views button in StaticDatePicker in React MUI v5.2.2?

How to disable views button in StaticDatePicker in React MUI v5?
The problem is that we have disabled some days and they are honored on picker view. But if you click the pencil icon it component is as shown below
And in this mode the user can select any date which breaks our app.
How do we disable views button? If we can't, then how do we make sure user can cannot select any date?
Add below CSS in your code. This is just quickfix for normal users. pro people/hackers can still change this prperty from their browser and access the button.
.PrivateDatePickerToolbar-penIcon {
visibility: hidden
}
Live Demo
Another answer could be to disabled the toolbar showToolbar={false}

How to detect back navigation triggered by swiping and stop it on iOS?

I have a form in my react native app. When a user tries to fill it and tries to navigate back without saving it. I would like to show an alert to confirm this action. If the user decides to submit this form, the triggered back action must be canceled. On Android, the back button can be controlled with an event listener. But how can we achieve that on iOS using react navigation?
It's not possible currently. However, you could disable the swipe gesture on the screen instead.

How can I fire a Javascript function when a standard visualforce page is loading in Salesforce?

On standard salesforce page, I need to display some custom buttons based on some conditions. The decision to display the button or not is based on response from Apex method. As my page is standard visual force page, how can I trigger the JavaScript function before the page is loaded so that I can take a decision whether to display the button or not?
You can display a custom button on standard salesforce page. but salesforce not allowed to make any call on load of standard page. Salesforce have a feature that is page layout. You can create different record type with page layout in that you can use custom button as your need.
On the other hand you can make a decision and filter when javascript custom button click and show error like 'you are not allowed to click this button'.

AngularJS calendar - navigation buttons events

I use the AngularJS calendar in my application. My question now would be, if there is a possibility with AngularJS to get the click event of button "today" and the buttons previous and next? The reason is that I will have my own buttons to navigate through the calendar.
AngularJS calendar
I would recommend you to use this plug for your comfortability
https://mattlewis92.github.io/angular-bootstrap-calendar/#?example=kitchen-sink
which by default have previous next and today button

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