JQuery interview questions and Answers

Using the jQuery attr() method attributes, an element can be set and added. This is also dynamically done in HTML elements.

Developers can use the removeAttr() method to remove an attribute of an HTML tag in jQuery. This method can remove one or more attributes from the selected element.

The syntax to use the following action is: $(selector).removeAttr(attribute)

To achieve the following function, we can use the val() function or attr function (limited to some fields).

The syntaxes to be used to receive the input value of an element using jQuery are as following:

$('#someInput').val();

The HTML() method is utilized to set content. It overwrites the whole content for the matched elements.

The preventDefault() function is used to prevent the default action the browser performs on that event, whereas the stopPropagation() method stops the game from bubbling up to the event chain. The divs click handler never works with stopPropagation(). With preventDefault(), the divs click handler works but browsers default action gets stopped.

In jQuery, the filter() method is used to create an array filled with all array elements that pass a test provided as a function. The technique doesn’t change the original collection or execute the array elements’ functions without values. Simplified, this method is used to filter out all the items that do not match the selected criteria set by the developers. The standards matches will be returned.

The live() method works for future matching and existing elements, whereas the bind() method works with the components of the attached event that match or exist the selector at the time of the call.

The .each() function in jQuery is used by developers to iterate over both arrays and objects seamlessly. Where arrays and array-like objects with a length property are iterated by numeric index, other objects are iterated with their named properties.

The prop() method is used to change properties for HTML tag as per the DOM tree, whereas attr() changes attributes for HTML tags.

JavaScript is a scripting language used on browser or server side. jQuery is a library for JavaScript. You can write code in JavaScript without needing jQuery, but you can’t write code in jQuery without JavaScript.