![]() Most developers want dynamic modals based on user interaction or situational modals. Static modals are great, but likely not what most folks want. Modals have to already exist on the page as HTML or programmatically added through JavaScript calls. You can find these interactive portions of bootstrap modals in the JavaScript library that accompanies the library, but there’s a caveat. You typically have all three working together to get the intended behavior the Bootstrap team intended. Bootstrap Modalsīootstrap modals are built with HTML, CSS, and Javascript in mind. ![]() ![]() Please note I’m using the HTMX.NET library and ASP.NET Core tag helpers. For folks who aren’t aware, HTMX is a hypermedia-focused library to build interactivity into your client applications with server-rendered responses. This post will show how to use Bootstrap modals with HTMX. That said, the JavaScript aspects are entirely optional, and the toolkit has a “Bring Your Own JavaScript” philosophy to integrate Bootstrap visual components into whatever frontend library you choose. Additionally, no frontend toolkit is complete with the accompanying JavaScript to make components interactive. If you’ve done any frontend development in the past decade, you’ve likely interacted with Bootstrap, a toolkit focused on providing developers with CSS layout rules and components. You can try using the following (Bootstrap 4 - in 3 use. If anything inside of that tree is relatively positioned, the z-index can no longer be compared effectively. modal-backdrop overlay sits in the root of the DOM tree while the other content is buried in a separate DOM node tree. If anything in that tree uses position: absolute or position:fixed - boom the problem shows up in modals. In the first example the tag is the Angular application's DOM root and everything rendered dynamically by Angular renders below it. If you can move your elements - great, but in dynamic applications rendered through a framework like Angular, it's likely you have a component rendering the modal, and you can't control where the element goes. This setup works because there's no top level container above the modal that introduces it's own positioning root. The easiest solution is to move the modal dialog outside of any container and just declare it under the element, or - remove any absolute, fixed or relative positioning. The problem occurs because the overlay and the other content container are not relative to each other so the position:absolute (or fixed) and their z-index values are not directly related to each other. The change post 3.34 of bootstrap was that the modal overlay was moved to the DOM root below while the actual modal dialog content in this case is sitting inside of a separate nested DOM structure. The above problem occurs when the Modal dialog sits within a container that has any parent that uses either fixed, absolute or relative positioning. The problem is that many modern applications use fixed, absolute and relative positioning to lay out their user interface. This problem seems to have arrived sometime around Bootstrap 3.33 - prior to that things seemed to work just fine but starting with 3.34 and later things started going south. I've repeatedly run into the following problem with Bootstrap's modal dialog where the dialog ends up showing underneath the modal background:
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