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Convert base64 string to ArrayBuffer
...r to blob:" + blob)
var fileReader = new FileReader();
fileReader.onload = function() {
var dataUrl = fileReader.result;
console.log("blob to dataUrl: " + dataUrl);
var base64 = dataUrl.substr(dataUrl.indexOf(',')+1)
console.log("dataUrl to base64: " + base64)...
How do I convert an existing callback API to promises?
...load() {
return new Promise(function(resolve, reject) {
window.onload = resolve;
});
}
You would then use the resulting promise like so:
load().then(function() {
// Do things after onload
});
With libraries that support deferred (Let's use $q for this example here, but we'll...
Setting focus on an HTML input box on page load
...
You could also use:
<body onload="focusOnInput()">
<form name="passwordForm" action="verify.php" method="post">
<input name="passwordInput" type="password" />
</form>
</body>
And then in your JavaScript:
f...
How to open a local disk file with JavaScript?
...;
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
displayContents(contents);
};
reader.readAsText(file);
}
function displayContents(contents) {
var element = document.getElementById('file-content');
elem...
Embedding SVG into ReactJS
...vg';
<SVG
src="/path/to/myfile.svg"
preloader={<Loader />}
onLoad={(src) => {
myOnLoadHandler(src);
}}
>
Here's some optional content for browsers that don't support XHR or inline
SVGs. You can use other React components here too. Here, I'll show you.
<img src="/...
How to change the opacity (alpha, transparency) of an element in a canvas element after it has been
...ctx.restore();
If you need img to be loaded:
var img = new Image();
img.onload = function() {
ctx.save();
ctx.globalAlpha = 0.4;
ctx.drawImage(img, x, y);
ctx.restore()
};
img.src = "http://...";
Notes:
Set the 'src' last, to guarantee that your onload handler is called on all...
How to get and set the current web page scroll position?
...in hidden variables. Then in the html of the refreshed page I use <body onLoad="window.scrollTo(x,y), where x and y are those from the hidden values values!
– xyz
Nov 4 '10 at 14:32
...
Why isn't my JavaScript working in JSFiddle?
... The reason it didn't work initially is that test was defined inside of an onLoad function; using window.test = function(){/*...*/} makes it work perfectly well.
– ellisbben
Sep 2 '11 at 15:18
...
Resizing an iframe based on content
...ent. To do this, framed.html has an iframe with src='' specified. When its onload fires, it evaluates its own height, and sets the src of the iframe at this point to helper.html?height=N
There's an explanation here of how facebook handle it, which may be slightly clearer than mine above!
Code
In...
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
... depends on the case. Let's try to trace some common behavior again:
img.onload may be called sometime in the future, when (and if) the image has successfully loaded.
setTimeout may be called sometime in the future, after the delay has expired and the timeout hasn't been canceled by clearTimeout. ...