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How to Use Modal Popup in Bootstrap?



In this tech tutorial, we are going to discuss the uses of modal popup function present in Bootstrap, which again is an essential aspect for numerous Bootstrap interview questions. For your acknowledgment, we will create as well as explain the basics of modal popup with examples further below. Be sure to continue until the end to better understand the aspects of Bootstrap’s modal component thoroughly.
What is a Bootstrap Modal?
In bootstrap, modal is a popup window or dialog box, which can be provided by developers to provide valuable information to the end or prompt users to perform necessary actions before proceeding further. Modal pop ups are widely used to inform users critical scenarios such as session time out and final confirmation before performing essential actions such as deleting or saving data. The modal pop ups can be easily created with the use of Bootstrap modal plugin
Bootstrap modal has always been an important chapter for the selection of multiple Bootstrap interview questions. Modals are created with CSS, Java Script, an dHTML, and positioned top in every document. Users have to remove the scroll function from the <body>, so that the modal content could perform the scrolls instead. Bootstrap only supports the use of one modal window at a time, and nested modal pop ups are not supported here.
A modal “backdrop” click will automatically close the modal. Modals in Bootstrap use position: fixed, which can be particular with rendering sometimes. Users require to place their modal HTML always in a top position to avoid in dereference from other fixed elements. The autofocus HTML attributes have absolutely no effect in Bootstrap modals due to the way HTML5 defines its semantics.
Now, let’s check a basic bootstrap modal example, which includes a header, message body and modal footer.
<div class="modal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">&times;</span>
</button>
</div>
<div class="modal-body">
<p>Modal body text goes here.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary">Save changes</button>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>

The above syntax will create a simple modal popup as presented in the below image.
How to Activate Modals Using Data Attributes?
Users can activate any bootstrap modal by clicking on a link via or button data attributes without the requirement to write any additional JavaScript code. Developers will need two components to activate a modal popup in Bootstrap via data attributes, one controller element such as a link or a button, secondly the modal element. Every Bootstrap modal’s outermost contained must have a unique id so that it can be precisely targeted via href (used for hyperlinks) or data-target(used for buttons) attributes of the controlled element.
Bootstrap niche developer aspirants must practice the data attributes of modals as its vital for several Bootstrap interview questions. We have to use the data-toggle="modal" attribute to add the controller element such a anchor or button, along with an attribute href="#myModal" or data-target="#my Modal" to toggle a target-specific modal. The class .modal-dialog will set the alignment (horizontal or vertical) and width of the modal box. The .modal-contentclass sets the background and text styles of our modal popup effectively. As for the rest, .modal-header will create a header for our modal and usually contains a close button. The .modal-body contains contents of our modal such as texts, forms, images, etc., and the .modal-footer will create the footer section of our dialogue box with action buttons.
Bootstrap interview question practices can browse our web portal Best Interview Questions to get high-quality sets of interview questions with their suggested answers.
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