Bootstrap4 apparently wants a specific version of jQuery:
It can be downloaded from the jQuery site (as of Feb 2020). Copy the file into the appropriate project directory. Currently that is:
Bootstrap also wants to use a library called popper. The developers of this library strongly urge that it be downloaded and maintained using a version control system such as npm. The following are suggested steps for obtaining a current version of popper:
1. Install npm (or pnpm). Currently is is available via Homebrew. (See Pnpm site for other ways to obtain pnpm.)
brew install pnpm
#. If you already have a js repository go there. Otherwise move to an empty directory. Run this command to download and build popper.
pnpm install @popperjs/core
#. Go to the directory where the one file we need is located.
#. Copy the file “popper.min.js” into the appropriate project directory. Currently that is:
The Three Levels of DOM Manipulation¶
There are 3 levels on which the page’s Document Object Model (DOM) may be manipulated.
1. Low-Level DOM manipulation¶
// Add a paragraph with text to a div let div = document.getElementById('myDiv'); let p = document.createElement('p'); div.appendChild(p); let text = document.createTextNode("Hello World"); p.appendChild(text); // Search through children of div element (Only 1 level down in tree) for(var i
2. Element-specific properties and methods¶
let field = document.getElementById('name'); field.value = "John";
3. JQuery manipulations¶
let allDivs = $('div'); allDivs.append('<p>hello</p>');