Wordpress action on click - wordpress

I'm trying to do a simple website on Wordpress. I got some buttons and I want them to add or remove a value from a variable on another page each time that button is clicked. How can I do that?

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I am using constant contact inside of WordPress. I have an email capture form with a submit button. I am trying to use that button to go to another webpage that redirects to an affiliate page. For some reason when I click that button it just goes to the first page and doesn't get redirected. I have edited my cpanel for that page to redirect where I want it to go but it always fails to do so when the button is clicked. What am I missing?

How to detect a click inside an iframe and make the original page react to that click

So basically i want to embed a form from one page(daughter) inside a different page(parent) and when people click the submit button in that form 2 things happen:1. the details are saved to the owner of the page(daughter) 2. the parent page gets redirect to another page.
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Xamarin forms - force show back button

I have a tabbed page, with 4 navigation pages in it.
I want the back button to show on the 'home' page of each of the navigation pages, and then I want to override the event so if its clicked on the home page it will go back to the previous tab (i'll keep track of the tabs they have been on myself).
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I think the best way is to not go for a back button. Remove it and add your custom button with the functionality you are looking for. The reason for this is because you're doing totally something different where the NavigationPage is designed for.

Drop down list with submit

Very basic question here. I'm trying to make a simple form that includes a dropdown list and a submit button, with each dropdown item corresponding to a pdf file. The user must simply select an item and click "submit" and the file will download.
I accomplished this by adding an onClick event to the submit button. HOWEVER, WordPress strips out onClick events. How do I accomplish this in the simplest way in a WordPress site? Thank you!
The simplest method would be to hard code your form into a page template in your theme. Here is a great resource for creating custom page templates: https://www.smashingmagazine.com/2015/06/wordpress-custom-page-templates/
If the code is added to the template, then the onClick will not be stripped out.

"Add Custom Fields" button not responding in wordpress website

Add custom fields button is not working from last few days. When I click on it, it doesn't add the value but after refreshing or updating the page it displays that custom field value entry for 2 times.
Website url : http://moviegore.com

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