Ppt on javascript events load

JavaScript and jQuery Information Systems 337 Prof. Harry Plantinga.

: scripts executed when they are called or when an event triggers function message() { alert("This alert box was called with the onload event"); } Where to Put It : scripts to be executed when they are loaded : scripts to be executed when they are loaded document.write(“This message is from JavaScript”); document.write(“This message is from JavaScript”); JavaScript Drawbacks Incompatibility from browser to browser Incompatibility from browser/


1 A World Wind Tour of JavaScript JavaScript. 2 Objectives l Introduction to JavaScript »JavaScript: Its Beginnings –Advantages and disadvantages –How.

server side programs »Working with JS and HTML tags. »Running onload, when done, on an event »Using JS objects »Objects with properties and methods »Using conditional tests 14 When does it run? JavaScript can run 1.as the page loads 2.as soon as the page is finished loading 3.in response to user input (remember the form button?) Competency Alert: You need to/


1 Week 10 A World Wind Tour of JavaScript JavaScript.

done, on an event »Using JS objects »Objects and forms (validating) »Rollovers 13 When does it run? It can run as the page loads as soon as the page is finished loading in response to user input (remember the form button?) 14 Document Object Document Object document.writeln("This page was last modified on” + document.lastModified); JavaScript that Runs as Page Loads Enter JavaScript. Within the/


JavaScript Programming an Introduction Prepared By P.D. Krolak and M.S. Krolak Based on material from JavaScript Unleashed (2nd Ed)

as the flow of events dictates. Events are generally created by an action of the user interacting with the page elements. An example, a mouse over a link. Loading a web page There is no difference in loading a page with a script or without one. HTML enhancements JS Fundamentals Versions of JS Version of JavaScriptBrowser Support Javascript 1.1Netscape 3. Javascript 1.2Netscape 4.0/


JavaScript Part 1. Slide 2 Lecture Overview JavaScript background The purpose of JavaScript JavaScript syntax.

event names differ between VB and JavaScript Slide 31 Common Events (1) Mouse Motion mouseover – mouse enters the region of an element mouseout – mouse leaves the region of an element focus – an element becomes active blur – an element because inactive http://www.w3schools.com/tags/ref_eventattrib utes.asp http://www.w3schools.com/tags/ref_eventattrib utes.asp Slide 32 Common Events (2) Document related events load – document loads/


Scripting Languages By Md. Mahfuzur Rahman.

JavaScript Functions and Events Can be called with the function name Can also be executed by an event Can have parameters and return statement Events are actions that can be detected e.g. OnMouseOver, onMouseOut etc. are normally associated with functions JavaScript: Events Javascript actions may be triggered from events/ an object onload= Page is finished loading (initial actions, info,) onSubmit= Submit button is clicked (validation etc.) JavaScript Popup boxes JavaScript can create: Alert box: to make/


CSCI 311, Advanced Web Development Celia Schahczenski Good reference: Learning PHP, MySQL, JavaScript, and CSS, 2nd Edition

as what we were doing with DOM. Locate the item which you want to change via document.getElementById(“xxx”); Use JavaScript to make the change Invoke the JavaScript based on – a browser event (onblur) – user inputs – timer CSS Units ( Units of length: px – pixels in – inches cm /the most common interaction sequences: Eliminate typing, or reduce it to as few characters as possible Use as few page loads as possible and minimal bytes for each page (most parts of the world are still outside the reach of high-/


JAVASCRIPT PROGRAMMING LANGUAGE. Introduction JavaScript is a scripting language. The term scripting language refers to programming languages that are.

specific circumstance that is monitored by JavaScript. The most common events are actions that users take. EVENTTriggered when About The loadihng of an image is interrupted Blur An elemet, such as a radio button, because inactive Click An element is clicked onces Change The calue of an element changes Error There is an erroe when loading a document or image Focus An element/


LEARN THE QUICK AND EASY WAY! VISUAL QUICKSTART GUIDE HTML and CSS 8th Edition Chapter 19: Adding JavaScript.

QUICK AND EASY WAY! VISUAL QUICKSTART GUIDE Objectives Work with scripts. Use JavaScript libraries. Load an external script. Minify a script. Add an embedded script. Handle JavaScript events. LEARN THE QUICK AND EASY WAY! VISUAL QUICKSTART GUIDE Adding JavaScript JavaScript defines special behaviors for a webpage. JavaScript programs can: –Show and hide content. –Write programs that load data and dynamically update page. –Build carousels and slideshows like those/


JavaScript Introduction 1. What is Java Script ? JavaScript is a client-side scripting language. A scripting language is a lightweight programming language.

help you create dynamic web pages that increase user interaction The building blocks of an interactive web page is the JavaScript event system. An event in JavaScript is something that happens with or on the webpage. A few example of events: A mouse click The webpage loading Mousing over a hot spot on the webpage, also known as hovering Selecting an input box in an HTML/


JavaScript Essentials Chapter 1 Introduction to JavaScript.

events not resulting from user actions JavaScript Essentials46 Table 1-2 JavaScript events Understanding Events (cont’d.) JavaScript Essentials47 Understanding Events (cont’d.) Working with elements and eventsEvents: associated with HTML elements –Event handler Code that executes in response to a specific event on a specific element –JavaScript code for an event handler Can be specified as attribute of element that initiates event JavaScript/currently loaded URL with a different one JavaScript /


JavaScript Development Introduction First Steps in JavaScript SoftUni Team Technical Trainers Software University

soon as the script is downloaded  Without blocking the browser in the meantime  defer  Executed in after the entire document has been loaded Modern Approach to Load JS Files 19  JavaScript code is executed during the page loading or when the browser fires an event  All statements are executed at page loading  Some statements just define functions that can be called later  No compile-time checks/


JavaScript Introduction 1. What is Java Script ? JavaScript is a client-side scripting language. A scripting language is a lightweight programming language.

help you create dynamic web pages that increase user interaction The building blocks of an interactive web page is the JavaScript event system. An event in JavaScript is something that happens with or on the webpage. A few example of events: A mouse click The webpage loading Mousing over a hot spot on the webpage, also known as hovering Selecting an input box in an HTML/


JavaScript Making Web pages come alive. Objectives Be able to read JavaScript scripts Be able to write JavaScript scripts.

, user actions generate events that belong to objects. mouseover load click Event Handlers Event handlers-respond to users actions –onmouseover –onmouseout –onload –onunload Event handlers are put inside corresponding HTML tags. Not inside … Case onClick="alert (You clicked the button!);" The underlined parts are HTML The quoted string is JavaScript onClick –The Java naming convention is easier to read. –This is fine in HTML, but an/


All in one place Telerik School Academy HTML, CSS and JavaScript.

be done in the head or in the body, depending on the case  JavaScript files have an extentions.js  Highly recommended  The.js files are being cached by the browser 9  JavaScript code is executed during the page loading or when the browser fires an event  All statements are executed at page loading  Some statements just define functions that can be called later  Function calls/


Session on Java script. Introduction JavaScript is the most popular scripting language on the internet, and works in all major browsers, such as Internet.

: document.write(" " + name + " ") can write a variable text into an HTML page JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element Introduction JavaScript can be used to validate data - A JavaScript can be used to validate form data before it is submitted to a/


JavaScript Lectures Level 7. What is JavaScript? JavaScript was designed to add interactivity to HTML pages JavaScript is a scripting language A scripting.

disp_alert() { alert("Hello again! This is how we" + + "add line breaks to an alert box!"); } JavaScript Functions To keep the browser from executing a script when the page loads, you can put your script into a function. A function contains code that will be executed by an event or by a call to the function. You may call a function from anywhere within/


Web Programming Java Script-Introduction. What is Javascript? JavaScript is a scripting language using for the Web. JavaScript is a programming language.

supplied code into the required places in your web page. Need to Know (Cont…) What Do I Need to Write JavaScript? JavaScript is an interpreted language, so no special program is required to create usable code. Any plain text editor such as /upon to run is immediately after a page loads. The window object has an event handler called onload. Unlike most event handlers, which are triggered in response to user action (for example, clicking a button), the onload event handler fires the instant that all of the/


SE-2840 Dr. Mark L. Hornick1 jQuery. jQuery is a library of JavaScript functions Helps minimize the amount of JavaScript you have to write in order to:

selecting a radio button clicking on an element 24 See http://www.w3schools.com/jquery/jquery_ref_events.asp window.onload event handling – the jQuery equivalent In regular JavaScript: window.onload = init; // or window.document.body.onload=init; function init() { // init code here… } In jQuery: $(window).load(init); or $(document).ready(init);//preferred! $().ready( function() {…}); // alt SE-2840 Dr. Mark L. Hornick25 $(document).ready vs/


JQuery A Javascript Library Hard things made eas(ier) Norman White.

a library of JavaScript Functions. jQuery is a lightweight "write less, do more" JavaScript library. The jQuery library contains the following features: – HTML element selections – HTML element manipulation – CSS manipulation – HTML event functions – JavaScript Effects and animations/and perform some action on them $(selector).action() Usually define functions only after the document is finished loading, otherwise elements may not be there. $(document).ready(function(){ // jQuery functions go here... }); /


Javascript DBI – Representation and Management of Data on the Internet.

You can associate buttons with JavaScript events (buttons in HTML forms) Some Events (a small sample) onUnLoad onLoad onClick onMouseUp onMouseDown onDblClick onMouseOver Window events Button events Link events onBlur v. onClick Checks /example of moving objects on the screen Moving Objects function moveIt() { //Get the client window width and height on the initial load. if (firstTime) { if (document.all) { // Internet Explorer maxHeight = document.body.clientHeight-imageHeight maxWidth = document.body./


JavaScript. JavaScript2 math Object n abs –math.abs(-80) is 80 n Many other functions.

If they were, however, this would be dangerous –A new script that was loaded would start off with some baggage JavaScript13 window Object n Every JavaScript expression implicitly refers to the current window –When a page that contains a script/ –value n String specifying value returned by radio button if it is selected when form is submitted JavaScript101 radio Object n Event handlers –onclick( ) n Invoked when radio button is clicked JavaScript102 radio Object n HTML syntax – JavaScript103 reset Object n/


JavaScript Programming an Introduction Prepared By P.D. Krolak and M.S. Krolak Based on material from JavaScript Unleashed (2nd Ed)

scripts are not executed in any necessary order. They are executed as the flow of events dictates. Loading a page There is no difference in loading a page with a script or without. HTML enhancements JS Fundamentals Versions of JS Version of JavascriptBrowser Support Javascript 1.1Netscape 2. Javascript 1.2Netscape Javascript 1.3Netscape 4. JS Operators Assignment Operators Arithmetic Operators Comparison Operators String Operators Conditional/


JavaScript CS 268. Topics Introduction to JavaScript Positioning a script Variables Type conversions Concatenation HTML forms Document Object Model Functions.

allows access - other browsers need an e parameter) But – results in more complicated code see next slide JavaScript Events Less code – and less complicated JavaScript Events Wait until page finishes loading to initialize the events Retrieve the element and assign a function to relevant events Retrieve the element triggering the event. Code varies between IE and rest of world Recent Firefox versions automatically drag all images when mouse/


11 Ajax JavaScript & jQuery the missing manual Chapter 11.

.js $(document).ready( function() { $(#btnComputeSum).bind(click, Compute_Sum); }); This anonymous function will be executed when the page has been loaded on the browser. The “ bind ” says to execute the JavaScript Compute_Sum function when btnComputeSum is clicked. The Compute_Sum function will receive a jQuery Event object as input parameter. 41 function Compute_Sum(evt) { $.get(Server_Calculation.aspx, input1= + $(#TextBox1).val() + &input2= + $(#TextBox2).val(), Process_Result); evt/


JQuery Javascript Framework Aryo Pinandito. A Little Bit About jQuery  jQuery is an Open-Source JavaScript framework that simplifies cross-browser client.

(‘href’); $(‘a’).attr(‘href’, ‘http://google.com’);http://google.com jQuery: Events General Eventsready, load, scroll Mouse Events click, hover, mouseenter, mouseleave Keyboard Eventskeypress, keydown, keyup Forms Eventssubmit, focus, blur Complete list at http://api.jquery.com/category/events/ $(element).eventType(function(){ // JavaScript }); jQuery: Live Events $(‘li’).live(‘click’, function(){ // Do Something }); A normal event binding attaches to all matched elements when it is called. A live/


JavaScript 1. What is JavaScript? JavaScript allows web authors to create dynamic pages that react to user interaction. It is an Object-based because.

a form. 27 Events EventEvent Handler click onclick load onload mouseover onmouseover mouseout onmouseout submit onsubmit unload onunload 28 2.Using The Event Handlers JavaScript can be configured to perform actions when events occur. – The event name is coded as an attribute of an HTML tag – The value of the event attribute contains the JavaScript code 29 Home JavaScript Practice Using Javascript Home 2.Using The Event Handlers Example: Display an/


DOM and JavaScript Aryo Pinandito. HTML DOM  DOM stands for the Document Object Model.  The HTML DOM is the Document Object Model for HTML.  The HTML.

HTML page like this: document.write(" " + name + " ")  can write a variable text into an HTML page  JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element  JavaScript can read and write HTML elements - A JavaScript can read and change the content of an HTML element/


JavaScript, Part 3 Instructor: Charles Moen CSCI/CINF 4230.

a link or a check box –Submitting a form –Loading a page An action triggers an event – e.g. click, submit, or load events Then a function is executed as a result of the event firing JavaScript (Koch‏) 3 Event Handlers  Event handlers are the functions that are executed when a particular event fires  We add GUI controls and event handlers to a Web page to make it interactive The/


JavaScript, by Dr. Khalil1 JavaScript Dr. Awad Khalil Computer Science Department AUC.

presses and/or holds down a key onKeyUp When the user releases a key Onload When the object is loaded into the user agent window (typically used with the element to run a script when the document has completed loading) JavaScript, by Dr. Khalil70 Event Handling (Cont’d)EventTrigger onMouseDown When the mouse butoon is depressed onMouseMove When the mouse is moved onMouseOut When/


Conditional Statements.  Quiz  The jQuery Template  JavaScript: Conditional Statements 2.

for the web page document. 24 Getting Started with jQuery: document.ready() CONTINUED $(document). ready( function() { // your JavaScript/jQuery code goes here alert(Gadzooks! It worked!); } ) ; The.ready() is an event handler that checks to see whether the document—and the DOM—is properly loaded and ready before running any more jQuery, particularly the function() code inside of the.readys parens. 25 Getting/


Chapter 5 © 2014 by Pearson Education 1 5.1 JavaScript Execution Environment - The JavaScript Window object represents the window in which the browser.

& nochange.js Chapter 5 © 2014 by Pearson Education 11 5.7 Handling Events from Textbox and Password Elements (continued) - Checking Form Input - A good use of JavaScript, because it finds errors in form input before it is sent to the / code } Chapter 5 © 2014 by Pearson Education 18 5.9 The canvas Element (continued) - Objects are often drawn when the document is loaded - The only primitive shape is a rectangle, either empty ( strokeRect ) or filled ( fillRect ) - Four parameters, two for position and two/


Module 13 Cool (!?) Stuff (JavaScript, AJAX, Greasemonkey)

specific element –embed into HTML Hi –specify in separate JavaScript var oDiv = document.getElemById(„div1“); oDiv.onclick = function() { alert(„...“); }... Hi Both versions are equivalent Kind of Events Mouse Events –click, dbclick, mousedown, mouseup, mousemove, mouseout, mouseover, dragstart, drag, dragend,... Keyboard Events –keypress, keydown, keyup,... –particular events for „alt“ key (dictates UI features!) HTML Events: track changes in BOM –load, unload, abort, error, resize, focus, blur, scroll DOM/


Front-end Performance. Why Performance? Users Download time JavaScript execution time Browser memory usage Search Engines Fast-loading pages are ranked.

selectors Cache expensive operations Aggregate & Minify JavaScript Use CSS instead Use event delegation Cache Expensive Operations JavaScript is heavy in iteration and recursion, so the effect of redundant function calls are often multiplied Best Practice: When calling the same function to get the same result multiple times, consider saving it to a variable first Aggregate JavaScript Each script loaded introduces request overhead Best Practice: Combine/


JavaScript Event Handlers. Introduction An event handler executes a segment of a code based on certain events occurring within the application, such as.

the users action with the mouse. On the other hand non-interactive event handler would be onLoad, because this event handler would automatically execute JavaScript code without the users interactivity. onAbort: An onAbort event handler executes JavaScript code when the user aborts loading an image. Example: Example of onAbort Event Handler Example of onAbort Event Handler Stop the loading of this image and see what happens: onBlur: An onBlur/


Adding Javascript How to include javascript in a webpage.

too HTML Events how to trigger your code Event Types User-generated events: e.g., mouse-click System-generated events, e.g., load event → triggered by web browser when HTML document finishes loading Event “Handlers” Code that executes in response to an event Naming convention Event name with a prefix of “on” (lowercase) click -> onclick HTML Tags and Events HTML TAG ≡ HTMLElement (DOM classname) SOME HTML elements can trigger javascript: Special HTML/


11 Ajax JavaScript & jQuery the missing manual Chapter 11.

( function() { $(#btnComputeSum).bind(click, Compute_Sum); }); This anonymous function will be executed when the page has been loaded on the browser. The “ bind ” says to execute the JavaScript function Compute_Sum when btnComputeSum is clicked. The Compute_Sum function will receive a jQuery Event object as input parameter. See “Unobtrusive JavaScript” http://en.wikipedia.org/wiki/Unobtrusive_JavaScript 37 function Compute_Sum(evt) { $.get(Server_Calculation.aspx, input1= + $(#Text1).val/


1 What is JavaScript? JavaScript was designed to add interactivity to HTML pages JavaScript is a scripting language - a scripting language is a lightweight.

put small "snippets" of code into their HTML pages JavaScript can put dynamic text into an HTML page - A JavaScript statement like this: document.write(" " + name + " ") can write a variable text into an HTML page JavaScript can react to events - A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element/


Getting Started. jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions.

From the to the The DOM is "ready" when everything on the page has loaded. Stylesheets JavaScripts Images The Document Object Model (DOM) is a cross-platform and language- independent /events and many other things using JQuery. $(document).ready(function() { alert(Welcome to JQuery); }); jQuery Document -> Ready is equivalent to body onload method and is executed when entire page and resources have been loaded in the DOM. If you run the above code you will get a Javascript alert box on document load/


1 What is JavaScript? JavaScript was designed to add interactivity to HTML pages JavaScript is a scripting language A scripting language is a lightweight.

mycars = new Array() mycars[0] = "Saab" mycars[1] = "Volvo“ mycars[2] = "BMW" for (x in mycars) { document.write(mycars[x] + " ") } 40 JavaScript Events Events are actions that can be detected by JavaScript. Examples of events: A mouse click A web page or an image loading Mousing over a hot spot on the web page Selecting an input box in an HTML form Submitting an HTML form/


5.1 JavaScript Execution Environment

the element acquires focus  SHOW nochange.html & nochange.js 5.7 Handling Events from Textbox and Password Elements (continued) - Checking Form Input - A good use of JavaScript, because it finds errors in form input before it is sent to the server/ 5.8 The DOM 2 Event Model (continued) - Not all events bubble (e.g., load and unload) - Any handler can stop further event propagation by calling the stopPropagation method of the Event object - DOM 2 model uses the Event object method, preventDefault, to stop/


Peter Laird. | 1 Getting Started Building Mashups using JavaScript, Ajax, and Google Maps Peter Laird Managing Architect WebLogic Portal BEA Systems.

How the Mashup Works Initial HTML page will render without any data User clicks a button to load the addresses  JavaScript event handler fires  XmlHttpRequest is sent to a URL to retrieve a list of addresses  Response / with Google Maps BEA Confidential How the Mashup Works Initial HTML page will render without any data User clicks a button to load the addresses  JavaScript event handler fires  XmlHttpRequest is sent to a URL to retrieve a list of addresses  Response contains a JSON payload of /


Starting Out With JavaScript. 2 Document Structure Document Appearance Interactivity.

energy and pizzaz into otherwise static web pages by allowing a page to interact with users and respond to events that occur on the page. JavaScript allows for dynamic interaction between the web page and the end-user. It would be a hard task to/request/reload-based. With DHTML, there may not be any interaction between the client and server after the page is loaded; all processing happens in JavaScript on the client side. By contrast, an Ajax page uses features of DHTML to initiate a request (or subrequest)/


Building Accessible User Interfaces with JavaScript and jQuery Antranig Basman, Core Framework Architect, The Fluid Project Clayton Lewis, Professor of.

attach click handler using jQuery // Shows an alert: "Todays pie is: Banana creme pie" $(element).click(); //trigger event using jQuery Over to Antranig JavaScript Pitfall Challenge #2 What is wrong with the following code? for (var i = 0; i < elements.length/{ console.log(“POST failed”); }); Loading markup A useful shorthand API is jQuery.load() Example from the docs: In practice, don’t use id-based selectors like this! – Violates portal-friendliness $(#result).load(“ajax/test.html #container”, myCallback);/


JavaScript JavaScript and HTML Text Chapter 4. Client-side JavaScript Defines a collection of objects, methods and properties that allow scripts to interact.

case "210": alert("A six-place high-performance airplane"); break; default:: alert("Error in JavaScript function planeChoice"); break; } } Text box events Textbox creates four events: blur, focus, change, select. An example from the text Text example (pg 207 / event-handler. When the event reaches the target node, any registered handler there are executed. In bubbling, the event travels back to the root executing enabled event-handlers for this event. bubbling Not every event bubbles. load and unload events/


The Web Wizard’s Guide To JavaScript Chapter 1 JavaScript Basics.

rollover effect by changing the SRC property of an with a simple JavaScript statement in an onmouseover event handler. This technique is not recommended, however, because it produces a delay in loading the second image. Preloading Images Preloading image files into the browser’s/object also contains a history object. The history object maintains a list of pages that have been loaded in the current window. JavaScript and Frames Frames can be seen as a parent–child hierarchy of window objects. Each window can/


AJAX Joining JavaScript and PHP 1. Asynchronous Javascript and XML (without having to refresh) 2.

professional designer Powerful tool for professional developer Disadvantage: few have both skills DHTML: HTML + CSS + JavaScript Needs more demanding skills from developers Example: Gowey’s snow 4 Desktop App vs. Internet IssuesDesktopWeb application/Properties PropertyDescription onreadystate change Used as an event handler for events that trigger upon state changes readyStatecontains the current state of the object (0: un-initialized, 1: loading, 2: loaded, 3: interactive, 4: complete) responseTextReturns/


JQuery 10/21. Today jQuery Some cool tools around the web JavaScript Libraries Drawing libraries HTML Frameworks Conventions.

things according to a standard. Therefore, you often need to have special cases for basic things like event handling. Why People Use Libraries… People use JavaScript libraries to avoid needing to take care of all these special cases themselves. Libraries handle different browser/JavaScript libraries. Things jQuery can do 1.Make it easy to run a function when your page loads. 2.Select a bunch of DOM elements and do something with them 3.Handle events 4.Do AJAX calls easily 1. Run something when the page loads/


Unobtrusive JavaScript CS380 1. The six global DOM objects CS380 2.

when page loads; sets up event handlers function pageLoad() { $("ok").onclick = okayClick; } function okayClick() { alert("booyah"); } window.onload = pageLoad; // global code JS OK HTML Common unobtrusive JS errors  event names are all lowercase, not capitalized like most variables 18 window.onload = pageLoad(); window.onload = pageLoad; okButton.onclick = okayClick(); okButton.onclick = okayClick; JS window.onLoad = pageLoad; window.onload = pageLoad; JS CS380 Anonymous functions  JavaScript allows/


Chapter 5 JavaScript and HTML Documents. © 2006 Pearson Addison-Wesley. All rights reserved. 5-2 5.1 JavaScript Execution Environment - The JavaScript.

Pearson Addison-Wesley. All rights reserved. 5-8 5.5 Handling Events from Body Elements - Example: the load event - triggered when the loading of a document is completed  SHOW load.html & display 5.6 Handling Events from Button Elements - Plain Buttons – use the onclick property -/2006 Pearson Addison-Wesley. All rights reserved. 5-11 5.7 Handling Events from Textbox and Password Elements (continued) - Checking Form Input - A good use of JavaScript, because it finds errors in form input before it is sent to/


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