CS计算机代考程序代写 cache angularjs gui javascript jquery Java COMP5347: Web Application Development Client-Side Libraries

jQuery – Advanced Selectors
– Pseudoclassselector
– E.g.Selectingalllinksthathavebeenvisited – var visitedLinks = $("a:visited");
– Beyond CSS selectors – ContentFilters
• Select elements based on criteria – FormSelectors
• Shorthand version to select form elements
The University of Sydney
COMP5347 Web Application Development
Page 15

jQuery – Content Filters Selector
– $("body *:contains('warning')”)
The University of Sydney
COMP5347 Web Application Development
Page 16

jQuery – Content Filters Selector
– $("body *:contains('warning')”)
The University of Sydney
COMP5347 Web Application Development
Page 17

jQuery – HTML Attributes and Properties
• We can both set and get an attribute value by using the attr() method
var link = $("a").attr("href"); $("a").attr("href","http://funwebdev.com"); $("img").attr("class","fancy");
The University of Sydney Page 18

jQuery – HTML Attributes and Properties
• The prop() method is the preferred way to retrieve and set
the value of a property.

var theBox = $(".meh"); theBox.prop("checked"); // evaluates to TRUE
The University of Sydney
Page 19

Form Selectors
Selector
CSS Equivalent
Description
$(:button)
$("button, input[type='button']")
Selects all buttons
$(:checkbox )
$('[type=checkbox]‘)
Selects all checkboxes
$(:checked)
No Equivalent
Selects elements that are checked. This includes radio buttons and checkboxes.
$(:disabled)
No Equivalent
Selects form elements that are disabled.
$(:enabled)
No Equivalent
Opposite of :disabled
$(:file)
$('[type=file]')
Selects all elements of type file
$(:focus)
$( document.activeElement )
The element with focus
$(:image)
$('[type=image]')
Selects all elements of type image
$(:input)
No Equivalent
Selects all , , <select>, and <button><br /> $(:password )<br /> $('[type=password]')<br /> Selects all password fields<br /> $(:radio)<br /> $('[type=radio]')<br /> Selects all radio elements<br /> $(:reset)<br /> $('[type=reset]')<br /> Selects all the reset buttons<br /> $(:selected)<br /> No Equivalent<br /> Selects all the elements that are currently selected of type<option>. It does not include checkboxes or radio buttons.<br /> $(:submit)<br /> $('[type=submit]')<br /> Selects all submit input elements<br /> $(:text)<br /> No Equivalent<br /> Selects all input elements of type text. $('[type=text]') is almost the same, except that $(:text) includes <input> fields with no type specified.<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 21</p> <p> Outline<br /> – JavaScript Frameworks<br /> – Intro to jQuery – Selectors<br /> – Event handler and DOM manipulation – Ajax requests<br /> – Integrate jQuery with Expressjs Application<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 22</p> <p> jQuery – Event Handling<br /> • jQuery supports creation and management of handlers for JavaScript events<br /> • jQuery has on() and off() methods and shortcut methods to attach events<br /> • Pure JavaScript uses the addEventListener() method<br /> The University of Sydney<br /> Page 23</p> <p> jQuery – Registering Event Handler<br /> – Standard event handling syntax<br /> – $("p").click(function(){ // action goes here!!<br /> });<br /> – CommonDOMeventsare<br /> – click, dbclick, mouseenter, mouseleave<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 24</p> <p> jQuery – Registering Event Handler<br /> – TheDocumentReadyEvent<br /> – Best practice to put jQuery code inside a document ready event<br /> – ThereadyeventisdefinedbyjQuery,firedaftertheDOMiscompleted<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 25</p> <p> JQuery – DOM Manipulation<br /> – Create DOM element/node JavaScript)<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 28</p> <p> jQuery – DOM Manipulation<br /> – Create DOM element/node (jQuery)<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 29</p> <p> DOM Manipulation – Appending Elements<br /> • Appending DOM Elements<br /> – The append() method takes as a parameter an HTML string, a DOM object, or a jQuery object. That object is then added as the last child to the element(s) being selected<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 30</p> <p> DOM Manipulation – Appending Elements<br /> • Appending DOM Elements<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 31<br /> $(“.linkOut”).append(jQueryLink);</p> <p> Normal DOM manipulation<br /> – Prepending DOM Elements<br /> – Theprepend()methodaddsthenewelementasthefirstchildratherthan<br /> the last<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 32<br /> $(“.linkOut”).prepend(jQueryLink);</p> <p> jQuery – DOM Manipulation<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 33</p> <p> jQuery – Useful Methods<br /> – attr() – set/get attribute value on any element from a selector – var link = $("a").attr("href");<br /> – $("img").attr("class","fancy");<br /> – css() - to set/get CSS properties on any element from a selector<br /> – varcolor=$("#element").css("background-color");<br /> – $("#colourBox").css("background-color","#FF0000")<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 34</p> <p> JQuery – Useful Methods<br /> – The html() - get the HTML contents of an element. If passed<br /> with a parameter, it updates the HTML of that element<br /> – The val() returns the value of the element. It is mainly used to get the value of form element.<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 35</p> <p> Outline<br /> – Intro to jQuery – Selectors<br /> – Event handler and DOM man – Ajax requests<br /> – Integrate jQuery with Expressjs Application<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 36</p> <p> Synchronous and Asynchronous Requests<br /> – Synchronousrequest<br /> – BrowsersendsarequestthenWAITfortheresponseandthenrender<br /> – Non-responsive:theusercannotinteractwiththeclientwhiletheserveris processing the request<br /> – Originallydesignedforawebofhypertextdocuments – Asynchronousrequest<br /> – user can interact with the application while the server processes the request concurrently<br /> – Client-sidescriptcreatinganXMLHttpRequestobjecttomanagea request and implicit/explicit callback function to handle the response<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 37</p> <p> Asynchronous JavaScript with XML (AJAX)<br /> – AJAX is a paradigm that allows a browser to send messages to the server without interrupting the flow of what’s shown in the browser<br /> The University of Sydney Page 38</p> <p> AJAX – Synchronous Request<br /> The University of Sydney Page 39</p> <p> AJAX – Asynchronous Request<br /> To load the time value asynchronously into </p> <div id=“timeDiv) $(“timeDiv”).load(“current-time.js”); The University of Sydney Page 40 jQuery – AJAX Support – load() – $(selector).load(URL,data,callback); – Load URL’s response into the selected element, optional data can be sent along with the request; optional callback can be executed after load() finishes – A GET request is sent if no data is present, otherwise a POST request is sent – get() – $.get(URL, data, callback); – Request data using HTTP GET method; the optional callback parameter is the name of a function to be executed after the response arrives – post() – $.post(URL, data, callback); – Request data using HTTP POST methods; optional data can be sent along with the request; optional callback can be executed after response arrives More about jQuery APIs - http://api.jquery.com/ The University of Sydney COMP5347 Web Application Development Page 41 Asynchronous Request – Source Code Example – The XMLHttpRequest object will fetch a static file from the server, the JavaScript running on the client browser dynamically insert the content into the current DOM tree. When the mouse is moved on any of the picture, a description of the corresponding book is shown The University of Sydney COMP5347 Web Application Development Page 42 How this Works – Source Code The University of Sydney COMP5347 Web Application Development Page 43 How this Works – Source Code Load JQuery JavaScript library When the DOM is fully loaded, execute this function; It registers three event handler functions to the <img> tag ;<br /> When the mouse enters an imageThe url is constructed based on image tag’s id value<br /> When the mouse leaves an image, clear the tag with id “contentArea”;<br /> When the mouse enters this image, load the content form this url “cpphtp6.html” to the division with id “contentArea”<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 44</p> <p> Selectors in the Example code<br /> name<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 45</p> <p> Selectors in the Example code<br /> name<br /> A unique id<br /> A class<br /> Select all <img> elements Select the current element<br /> Select an element with id “contentArea”<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 46</p> <p> Outline<br /> – Intro to jQuery – Selectors<br /> – Event handler and DOM man – Ajax requests<br /> – Integrate jQuery with Expressjs Application<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 48</p> <p> Express with jQuery<br /> – We can add AJAX support to the simple app (this week tutorial)<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 49<br /> Effect of render blocking JavaScript</p> <p> AJAX Frontend Output<br /> The result is displayed on the same page<br /> The request is of type XMLHttpRequest (XHR)<br /> The initiator is jquery.min.js<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 50</p> <p> Changes to the title form view<br /> – Add a place holder for results<br /> – Add reference to scripts<br /> – Change the submit button behaviour<br /> titleFormAjax.pug<br /> doctype html<br /> html(lang="en")<br /> head<br /> title Ajax Search Example script(src="https://code.jquery.com/jquery-3.2.1.js") script(src="/js/main.js")<br /> body<br /> h2 Simple Form<br /> input#title(type="search", placeholder="BBC") button#button(type='button') Search div#results<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 51</p> <p> The Client-side Script<br /> $(document).ready(function(){ $('#button').on('click', function(e){<br /> var parameters = {title: $('#title').val() };<br /> $.get( 'revisionajax/getLatest',parameters, function(result) { $('#results').html(result);<br /> }); });<br /> });<br /> $(document).ready(function(){ $('#button').on('click', function(e){<br /> var data=$('#title').val();<br /> $('#results').load('revisionajax/getLatest?title='+data) });<br /> });<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 52</p> <p> The Client-side Script<br /> $(document).ready(function(){ $('#button').on('click', function(e){<br /> Another way of registering event handler<br /> var parameters = {title: $('#title').val() };<br /> $.get( 'revisionajax/getLatest',parameters, function(result) {<br /> }); });<br /> $('#results').html(result); }); Put the result as the content of this element<br /> Get the value of this input item, and construct parameter data based on it<br /> Send a get request with data<br /> These two are equivalent. The top one use $.get(url, data,callback), The bottom one uses element.load(url)<br /> $(document).ready(function(){ $('#button').on('click', function(e){<br /> var data=$('#title').val();<br /> $('#results').load('revisionajax/getLatest?title='+data) });<br /> });<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 53</p> <p> What else do we need to change?<br /> – No major change except a few “wirings”<br /> – The url to controller mapping – Controllertonewview<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 54</p> <p> The jqXHR Object<br /> – All jQuery Ajax requests return a jqXHR object to encapsulate the response from the server<br /> – jqXHR is a superset of the original XMLHTTPRequest object<br /> – jqXHR can be used handle various server responses: – jqXHR.done()forsuccess<br /> – jqXHR.fail()forerror<br /> – jqXHR.always()isliketheregulartry-catch-finallyblock<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 55</p> <p> The jqXHR Object Example<br /> $(document).ready(function(){ $('#button').click(function(e){<br /> var parameters = {title: $('#title').val() };<br /> var jqxhr = $.get( 'revisionajax/getLatest',parameters) jqxhr.done(function(result) {<br /> $('#results').html(result);<br /> });<br /> jqxhr.fail(function(jqXHR){<br /> $('#results').html("Response status:" + jqXHR.status)<br /> //console.log("Response status:" + jqXHR.status)<br /> }) });<br /> });<br /> http://api.jquery.com/jQuery.ajax/#jqXHR The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 56</p> <p> The jqXHR Object Example<br /> $(document).ready(function(){ $('#button').click(function(e){<br /> var parameters = {title: $('#title').val() };<br /> var jqxhr = $.get( 'revisionajax/getLatest',parameters) jqxhr.done(function(result) {<br /> $('#results').html(result);<br /> });<br /> jqxhr.fail(function(jqXHR){<br /> $('#results').html("Response status:" + jqXHR.status)<br /> //console.log("Response status:" + jqXHR.status)<br /> }) });<br /> });<br /> http://api.jquery.com/jQuery.ajax/#jqXHR The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 57</p> <p> Same Origin Policy (SOP)<br /> – Cross-originscripting<br /> – maliciousscript(hostedonanotherdomain)trytoaccessthecontentof<br /> other pages on the user’s browser<br /> – Important security concept in modern browsers<br /> – Mostly,restrictwhatresourcesJavaScript(andotherscriptinglanguage) can access inside a browser<br /> • DOM, Cookie, XMLHttpRequest, and so on<br /> – An origin is defined by protocol, host name and port number<br /> – If two pages are from same origin, the web browser permits scripts from one page to access data in a second page<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 58</p> <p> AJAX – Same Origin Policy<br /> – XMLHttpRequest object does not allow a web application to request resources from servers other than the one that served the web application (SOP on XHR)<br /> – Sharing content lawfully between two domains become a challenge – E.g.,www.funwebdev.comandimages.funwebdev.com<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 59</p> <p> AJAX – dealing with SOP<br /> – Implement a server-side proxy— an application on the web application’s web server—that can make requests to other servers on the web application’s behalf<br /> – Cross-origin Resource Sharing (CORS) uses new headers in the HTML5 standard to let site specify other domains that can share its content through JavaScript<br /> – E.g.,Access-Control-Allow-Origin:www.funwebdev.com<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 60</p> <p> Resources<br /> – Randy Connolly, Ricardo Hoar, Fundamentals of Web Development, Global Edition, Pearson<br /> – W3C school jQuery Tutorial<br /> – http://www.w3schools.com/jquery/default.asp<br /> – jQuery API Documentation – http://api.jquery.com/<br /> The University of Sydney<br /> COMP5347 Web Application Development<br /> Page 61</p> <p> W8 Tutorial: Mongoose<br /> W9 Lecture: Introduction to React/Angular<br /> W9 Tutorial: jQuery/AJAX<br /> The University of Sydney Page 62</p> </div><!-- .entry-content .clear --> </div> </article><!-- #post-## --> <nav class="navigation post-navigation" aria-label="Post navigation"> <span class="screen-reader-text">Post navigation</span> <div class="nav-links"><div class="nav-previous"><a title="CS计算机代考程序代写 cache js javascript Java algorithm COMP5347: Web Application Development The Browser and the Rendering Process" href="https://powcoder.com/2021/06/19/cs%e8%ae%a1%e7%ae%97%e6%9c%ba%e4%bb%a3%e8%80%83%e7%a8%8b%e5%ba%8f%e4%bb%a3%e5%86%99-cache-js-javascript-java-algorithm-comp5347-web-application-development-the-browser-and-the-rendering-process/" rel="prev"><span class="ast-left-arrow">←</span> Previous Post</a></div><div class="nav-next"><a 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