onload | 易学教程

A reusable function to clip images into polygons using html5 canvas

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Guess the title of the post may need editing, but for now I don't know where the problems are. I have read pages and answers to similar questions, here and elsewhere. One Stack Overflow answer is especially close, but I don't understand it. I want a function, to draw polygons on canvas at desired coordinates and to fill them with some background image loaded from a file (large enough that no tiling is needed). Triangles would be fine for a test. Apparently I should use drawImage and clip, and to give the polygon a border, I can resuse the same path for the clip and the stroke. Also apparently

difference between javascript onload event and plain script in the html page

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问题 What is the difference between these two pieces of code Sample 1: <script type="text/javascript"> function myfunc () { alert('hi'); } window.onload = myfunc; </script> Sample 2: <script type="text/javascript"> alert('hi');//no function used </script> both pieces of code execute successfully.Thanks in advance. 回答1: The window.onload makes it so that all DOM elements are loaded before the script runs - that is, if your script modifies or uses DOM elements, then it should be attached to window

this.name returns undefined in javascript

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I am trying to remotely create an onclick for each div (to save typing time). Here is the window.onload function; window.onload = function() { divel = document.getElementsByTagName('div'); for(var el in divel){ divel[el].onmouseover = function(){ this.style.textDecoration = "underline"; }; divel[el].onmouseout = function(){ this.style.textDecoration = "none"; }; divel[el].onclick = function(){ document.getElementById('game').src = "/games/" + this.name; }; } } The name of every div is "flyingsheep" - this value was set by the traditional < div name="flyingsheep" > When I click the div, the

How do I get the value of drop down list on page load

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问题 Using jQuery, how can I get the selected item's value in a select when the page loads? I can do it onChange etc but cant figure out the way on page load. Here's my code: <select name="symb" id="symb"> <option value="1#10#6">Basic Personal</option> <option selected="selected" value="2#20#6">Basic Family</option> <option value="7#90#12">Advanced Personal</option> <option value="8#120#12">Advanced Family</option> <option value="9#130#12">Optimum Personal</option> <option value="10#170#12"

Passing value to JS function through URL on window load

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问题 my page http://www.dinomuhic.com/2010/index.php loads the Showreel at the start of the page using an onLoad call in body like this: <body onLoad="sndReq('96')"> 96 is the ID of the showreel in the SQL Library. The JS function "sndReq" is an AJAX call using JQuery which opens the requested item and displays it in the main window. Now my question: What if I want to send a link to a client which opens a specific item directly so he does not have to navigate through the site? Something like http:

Why does window.onload event occur before $(document).ready?

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As stated in this thread: window.onload vs $(document).ready() . The window.onload should occur later than the $(document).ready() but in this simple code the log would show that the onload event is executed before the ready event? What I'm I missing here? <!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> </head> <body> <h1>A Simple Site</h1> <script> $(document).ready(function() { console.log("ready event fired"); }) window.onload = function() { console.log("onload event fired"); } </script> </body> </html> The problem is

onload in iframes not working, if iframe have non-html document in src (pdf or text)

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I have iframe with onload handler: <iframe id="FrameForPrintVersion" src="" border="0" style="height:0; width:0; visibility:hidden;" onload = 'frameOnload()' > It works fine if i use html-pages as the source of the iframe, but not when i set src to any pdf document. Is it posible to handle when a PDF document was loaded in this case? Ashirvad According to the W3C, the iframe tag does not support any event attributes. Although major browsers support it but can not be relied upon. If you really want it try this workaround.You can try something like this. setTimeout(function(){ if($('

hide iPhone address bar with 100% height

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问题 Many posts on this, but not quite for my situation. My page has flexible dimensions set to 100% width and 100% height, so the typical on-load scroll function isn't working. Any thoughts or other solutions? Thanks! CSS: * { margin:0; padding:0; } html, body { width:100%; height:100%; min-width:960px; overflow:hidden; } Javascript: /mobile/i.test(navigator.userAgent) && !pageYOffset && !location.hash && setTimeout(function () { window.scrollTo(0, 1); }, 1000); 回答1: This solution from Nate

Jquery img added through append() triggers onload twice

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The code that produces the headache for me is rather simple: $(function(){ $("#test").append('<img onload="alert(\'hi\')" src="Image.jpg"/>'); }) I have the above code in my head and a div with id 'test' in the body. Now my problem is that the page produces two alerts when the image is loaded, but I expected it to produce only one as the 'onload' should be triggered only once- The way it happens when I add the image manually without any javascript.. See the fiddle I made at: http://jsfiddle.net/9985N/ Any help/explanation is greatly appreciated... UPDATED (Because some people don't believe me,

.onload called multiple times from Firefox extension

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问题 I'm developing a Firefox extension and have the following code: function initialize() { // For accessing browser window from sidebar code. var mainWindow = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor) .getInterface(Components.interfaces.nsIWebNavigation) .QueryInterface(Components.interfaces.nsIDocShellTreeItem) .rootTreeItem .QueryInterface(Components.interfaces.nsIInterfaceRequestor) .getInterface(Components.interfaces.nsIDOMWindow); var gBrowser = mainWindow.gBrowser;