You have to make sure that popper.js is included and loaded in your Angular app because that is required for all things that pop up or drop down in Bootstrap 4. Websites that use Bootstrap 4 framework, sometimes need a bigger search form in the navigation bar. It contains three kinds of visual elements, including icons with text, search bar, and drop-down menu. A search box is a type of box in which you can write the string which you want to search. In this tutorial, we will be creating a flat style navigation with a search box and dropdown menu from the Square UI. Photoshop Handoff PS designs with accurate specs, assets & code you can use multiple input in dropdowm. Excellent search box design help to enhance user experience. Now you can optionally use