onload

Javascript read file without using input

由 落花浮王杯 提交于 2019-11-27 03:19:15
问题 I have this code and for a file to be converted into base64 I have to click on Choose file and then select it. I want to hardcode the file name so it is converted to base64 on page load. JavaScript: var handleFileSelect = function(evt) { var files = evt.target.files; var file = files[0]; if (files && file) { var reader = new FileReader(); reader.onload = function(readerEvt) { var binaryString = readerEvt.target.result; document.getElementById("base64textarea").value = btoa(binaryString); };

Can I sync up multiple image onload calls?

由 旧巷老猫 提交于 2019-11-27 01:42:57
问题 I want a function to run when specific images are loaded, but I don't know how to wait for both to load before running. I only know how to chain them, like below: Image1 = new Image(); Image1.src = 'image1-link.jpg'; Image2 = new Image(); Image2.src = 'image2-link.jpg'; Image1.onload = function() { Image2.onload = function() { ... } } The downside to this is it has to wait till Image1 completely loads before getting the second. I want to try something like this: Image1 = new Image(); Image1

javascript, image onload() doesnt fire in webkit if loading same image

由 折月煮酒 提交于 2019-11-27 01:38:19
问题 I have an <img> element and I'm changing its src attribute. The element has an onload handler function attached. Each time i change the src attribute and the image loads the handler function should run. In Chrome and Safari, if I assign the same src as the one before, the handler function is not run. Before assigning that same src as before i've tried imgElement.src='' , imgElement.src= null , imgElement.src='notExistingFile.jpg' and none of it works. Please help. Anyone had this problem

window.onload vs document.ready jQuery

由 血红的双手。 提交于 2019-11-27 01:31:11
问题 I have a site with two columns. I want to have equal height on both using jQuery. I'm trying to get the logo column height. I had: $(document).ready(function() { alert($('#logo').height()); });​ and it didn't work. So I changed it to: window.onload = function(){ alert($('#logo').height()); } And it's working. What is going on in here? 回答1: I had a same problem in handling Image height and width inside $(document)ready and I found some better referenses to solve it... I hope this may help some

Difference between onload() and $.ready?

由 纵饮孤独 提交于 2019-11-27 00:17:32
Can you list the difference between onload() and $(document).ready(function(){..}) functions in the using jQuery? the load event (a.k.a "onload") on the window and/or body element will fire once all the content of the page has been loaded -- this includes all images, scripts, etc... everything. In contrast, jquery's $(document).ready(...) function will use a browser-specific mechanism to ensure that your handler is called as soon as possible after the HTML/XML dom is loaded and accessible. This is the earliest point in the page load process where you can safely run script that intends to

What html tags support the onload/onerror javascript event attributes?

由 孤者浪人 提交于 2019-11-26 20:54:31
I'm familiar with the typical use of onload , as in the following: <body onload="alert('Hello, World!');"> ... </body> What are all the html elements that fire a load event? (thus executing javascript supplied in an onload attribute) For example, img is one such tag that will execute the javascript supplied in an onload attribute when some.png has loaded: <img onload="someImgLoaded()" src="some.png" /> Brian R. Bondy 'onload' is supported by the following HTML tags: <body>, <frame>, <frameset>, <iframe>, <img>, <link>, <script> And the following Javascript objects: image, layer, window Devin G

jquery get height of iframe content when loaded

由 限于喜欢 提交于 2019-11-26 19:36:39
I have a Help page, help.php that I am loading inside an iframe in main.php How can I get the height of this page once it has loaded in the iframe? I am asking this because I can't style the height of to iframe to 100% or auto. That's why I think I need to use javascript.. I am using jQuery CSS: body { margin: 0; padding: 0; } .container { width: 900px; height: 100%; margin: 0 auto; background: silver; } .help-div { display: none; width: 850px; height: 100%; position: absolute; top: 100px; background: orange; } #help-frame { width: 100%; height: auto; margin:0; padding:0; } JS: $(document)

Javascript before onload?

由 不问归期 提交于 2019-11-26 18:22:38
问题 Is there any event handler before onLoad/onPageShow? The trouble with onLoad is if there is any change in display, the page will show up without change until it is fully loaded, then the script will run. What is the best way to make sure it will run as soon as possible? 回答1: If you put Javascript statements (rather than function definitions) inside a <script> tag, they will be executed during page loading - before the onLoad event is fired. <html> <body> <h2>First header</h2> <script type=

Cannot set property 'innerHTML' of null

由 夙愿已清 提交于 2019-11-26 17:33:06
Why do I get an error or Uncaught TypeError: Cannot set property 'innerHTML' of null? I thought I understood innerHTML and had it working before. <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Untitled Document</title> <script type ="text/javascript"> what(); function what(){ document.getElementById('hello').innerHTML = 'hi'; }; </script> </head> <body> <div id="hello"></div> </body> </html> Erik Godard You have to place the hello div before the script, so that it exists when the script is loaded. Colyn1337 You need to tell javascript

Adding multiple onload handlers

由 若如初见. 提交于 2019-11-26 17:18:17
问题 I have two js files, each one with its own window.onload handler. Depending on how I attach the two onload handlers to the window object I get a different behaviour on the second handler. More specifically, here is my html file: <html> <head> <title>Welcome to our site</title> <script type="text/javascript" src="script1.js"> </script> <script type="text/javascript" src="script2.js"> </script> </head> <body id="pageBody"> <h2 align="center"> <a href="http://www.whatever.com" id="redirect">
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