Questions and Answers
Which of the following is correct?
JQuery uses CSS selectors to select elements?
True
Which sign does jQuery use as a shortcut for jQuery?
$ sign
Look at the following selector: $("div"). What does it select?
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Is jQuery a library for client scripting or server scripting?
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Is it possible to use jQuery together with AJAX?
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The jQuery html() method works for both HTML and XML documents.
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What is the correct jQuery code to set the background color of all p elements to red?
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With jQuery, look at the following selector: $("div.intro"). What does it select?
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Which jQuery method is used to hide selected elements?
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Which jQuery method is used to set one or more style properties for selected elements?
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Which jQuery method is used to perform an asynchronous HTTP request?
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What is the correct jQuery code for making all div elements 100 pixels high?
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Which statement is true?
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What scripting language is jQuery written in?
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Which jQuery function is used to prevent code from running before the document is finished loading?
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Which jQuery method should be used to deal with name conflicts?
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Which jQuery method is used to switch between adding/removing one or more classes from selected elements?
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Look at the following selector: $("div p"). What does it select?
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Is jQuery a W3C standard?
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Look at the following selector: $("p#intro"). What does it select?
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Which jQuery method is used to remove selected elements?
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Look at the following selector: $(":disabled"). What does it select?
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Which jQuery method returns the direct parent element of the selected element?
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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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Description
Test your knowledge of jQuery with this quiz based on W3Schools. From understanding its purpose as a JavaScript library to selecting elements with CSS selectors, this quiz covers essential concepts. Challenge yourself and see how well you understand jQuery!
