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Questions and Answers
Which of the following is correct?
Which of the following is correct?
- jQuery is a CSS Framework
- jQuery is a markup language
- jQuery is a JavaScript Library (correct)
- jQuery is a database management system
JQuery uses CSS selectors to select elements?
JQuery uses CSS selectors to select elements?
True (A)
Which sign does jQuery use as a shortcut for jQuery?
Which sign does jQuery use as a shortcut for jQuery?
$ sign
Look at the following selector: $("div"). What does it select?
Look at the following selector: $("div"). What does it select?
Is jQuery a library for client scripting or server scripting?
Is jQuery a library for client scripting or server scripting?
Is it possible to use jQuery together with AJAX?
Is it possible to use jQuery together with AJAX?
The jQuery html() method works for both HTML and XML documents.
The jQuery html() method works for both HTML and XML documents.
What is the correct jQuery code to set the background color of all p elements to red?
What is the correct jQuery code to set the background color of all p elements to red?
With jQuery, look at the following selector: $("div.intro"). What does it select?
With jQuery, look at the following selector: $("div.intro"). What does it select?
Which jQuery method is used to hide selected elements?
Which jQuery method is used to hide selected elements?
Which jQuery method is used to set one or more style properties for selected elements?
Which jQuery method is used to set one or more style properties for selected elements?
Which jQuery method is used to perform an asynchronous HTTP request?
Which jQuery method is used to perform an asynchronous HTTP request?
What is the correct jQuery code for making all div elements 100 pixels high?
What is the correct jQuery code for making all div elements 100 pixels high?
Which statement is true?
Which statement is true?
What scripting language is jQuery written in?
What scripting language is jQuery written in?
Which jQuery function is used to prevent code from running before the document is finished loading?
Which jQuery function is used to prevent code from running before the document is finished loading?
Which jQuery method should be used to deal with name conflicts?
Which jQuery method should be used to deal with name conflicts?
Which jQuery method is used to switch between adding/removing one or more classes from selected elements?
Which jQuery method is used to switch between adding/removing one or more classes from selected elements?
Look at the following selector: $("div p"). What does it select?
Look at the following selector: $("div p"). What does it select?
Is jQuery a W3C standard?
Is jQuery a W3C standard?
Look at the following selector: $("p#intro"). What does it select?
Look at the following selector: $("p#intro"). What does it select?
Which jQuery method is used to remove selected elements?
Which jQuery method is used to remove selected elements?
Look at the following selector: $(":disabled"). What does it select?
Look at the following selector: $(":disabled"). What does it select?
Which jQuery method returns the direct parent element of the selected element?
Which jQuery method returns the direct parent element of the selected element?
The jQuery animate() method can be used to animate ANY CSS property?
The jQuery animate() method can be used to animate ANY CSS property?
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Study Notes
jQuery Basics
- jQuery is a JavaScript library designed for simplifying client-side scripting.
- Uses the
$sign as a shorthand reference to jQuery functions. - It integrates seamlessly with AJAX for asynchronous data requests.
Selectors and Elements
- CSS selectors are utilized to select elements within jQuery.
- Example:
$("div")selects all<div>elements in the document. $("div.intro")selects<div>elements with the classintro.$("div p")selects all<p>elements that are descendants of<div>elements.
jQuery Methods
- To change an element's style, use
css(), e.g.,$("p").css("background-color","red")sets background color to red. - The
hide()method hides selected elements whiletoggleClass()adds or removes a class from selected elements. - Use
animate()to animate CSS properties, but it only works with numeric values. - The
parent()method retrieves the direct parent of a selected element. - For removing elements, you can use both the
remove()anddetach()methods.
Document and Loading
$(document).ready()prevents code execution until the DOM is fully loaded.- Since jQuery is not a W3C standard, it requires no specific standards compliance.
Input and Forms
$(":disabled")selects all disabled input fields.- The method
html()only works with HTML documents, not XML.
Special Cases and Features
- The
noConflict()method resolves conflicts with other libraries or frameworks. - The
jQuery.ajax()method allows for asynchronous HTTP requests. $("p#intro")selects the<p>element with the IDintro.- The
height()method can set the height of elements, e.g.,$("div").height(100)sets heights to 100 pixels.
jQuery Library Access
- To use jQuery, referencing a hosted library (like Google's CDN) is an option but it is not built into all browsers.
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