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Show an image preview before upload
...").onchange = function () {
var reader = new FileReader();
reader.onload = function (e) {
// get loaded data and render thumbnail.
document.getElementById("image").src = e.target.result;
};
// read the image file as a data URL.
reader.readAsDataURL(this.files[0]...
Capture iframe load complete event
...ing.
<script>
var iframe = document.createElement('iframe');
iframe.onload = function() { alert('myframe is loaded'); }; // before setting 'src'
iframe.src = '...';
document.body.appendChild(iframe); // add it to wherever you need it in the document
</script>
2) inline javascript, ...
Control the dashed border stroke length and distance between strokes
...n place of the border:
div {
background-image: url("data:image/svg+xml,%3csvg width='100%25' height='100%25' xmlns='http://www.w3.org/2000/svg'%3e%3crect width='100%25' height='100%25' fill='none' stroke='black' stroke-width='4' stroke-dasharray='6%2c 14' stroke-dashoffset='0' stroke-linecap='squ...
Why is document.body null in my javascript?
... section that uses body. Not cool.
You want to wrap this code in a window.onload handler or place it after the <body> tag (as mentioned by e-bacho 2.0).
<head>
<title>Javascript Tests</title>
<script type="text/javascript">
window.onload = function() {
...
How to get image size (height & width) using JavaScript?
... check the dimensions using Javascript...
const img = new Image();
img.onload = function() {
alert(this.width + 'x' + this.height);
}
img.src = 'http://www.google.com/intl/en_ALL/images/logo.gif';
This can be useful if the image is not a part of the markup.
...
How to detect internet speed in JavaScript?
...really accurate, the idea is load image with a known file size then in its onload event measure how much time passed until that event was triggered, and divide this time in the image file size.
Example can be found here: Calculate speed using javascript
Test case applying the fix suggested there:
...
How do I capture response of form.submit
...ated: var xhr = new XMLHttpRequest() xhr.open("POST", "myscript.php"); xhr.onload=function(event){ alert("The server says: " + event.target.response); }; var formData = new FormData(document.getElementById("myForm")); xhr.send(formData);
– 12Me21
Apr 25 '17 at...
Reading file contents on the client-side in javascript in various browsers
...eader = new FileReader();
reader.readAsText(file, "UTF-8");
reader.onload = function (evt) {
document.getElementById("fileContents").innerHTML = evt.target.result;
}
reader.onerror = function (evt) {
document.getElementById("fileContents").innerHTML = "error reading f...
How to get JSON from URL in JavaScript?
...();
xhr.open('GET', url, true);
xhr.responseType = 'json';
xhr.onload = function() {
var status = xhr.status;
if (status === 200) {
callback(null, xhr.response);
} else {
callback(status, xhr.response);
}
};
xhr.send();
};
And use it like...
How can I make a WPF combo box have the width of its widest element in XAML?
... {
base.OnAttached();
AssociatedObject.Loaded += OnLoaded;
}
protected override void OnDetaching()
{
base.OnDetaching();
AssociatedObject.Loaded -= OnLoaded;
}
private void OnLoaded(object sender, RoutedEvent...