I have an image at the URL http://192.168.1.53/html/cam.jpg (from a Raspberry Pi) and this image is changing very fast (it is from a camera).
So I want to have some JavaScript on a website that will reload this image every second for example.
My HTML is:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Pi Viewer</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
</head>
<body>
<style>
img,body {
padding: 0px;
margin: 0px;
}
</style>
<img id="img" src="http://192.168.1.53/html/cam.jpg">
<img id="img1" src="http://192.168.1.53/html/cam.jpg">
<script src="script.js"></script>
</body>
</html>
And my script:
function update() {
window.alert("aa");
document.getElementById("img").src = "http://192.168.1.53/html/cam.jpg";
document.getElementById("img1").src = "http://192.168.1.53/html/cam.jpg";
setTimeout(update, 1000);
}
setTimeout(update, 1000);
alert is working, but the image is not changing :/ (I have 2 images (they are the same))
The problem is that the image src is not altered so the image is not reloaded.
You need to convince the browser that the image is new. A good trick is to append a timestamp to the url so that it is always considered new.
function update() {
var source = 'http://192.168.1.53/html/cam.jpg',
timestamp = (new Date()).getTime(),
newUrl = source + '?_=' + timestamp;
document.getElementById("img").src = newUrl;
document.getElementById("img1").src = newUrl;
setTimeout(update, 1000);
}
Related
Following the getting started with FAST element guide here, I don't understand why the value of the attribute is not changing whenever I use the element in.
Even when following the guide completely by basically copying and pasting the sample code, I can't make it work.
Based on the code and markup below, I would expect that the h3 element has the value of test and not default.
Anybody who has same issue, or know what I might be doing wrong?
Btw, I'm using esbuild to bundle, transpile and serve the files.
import { FASTElement, customElement, attr, html } from "#microsoft/fast-element";
const template = html`
<div class="header">
<h3>My name is: ${x => x.greeting}</h3>
</div>
<div class="name-tag-body">
<slot>Default slot</slot>
</div>
`;
#customElement({
name: 'name-tag',
template: template
})
export class NameTag extends FASTElement {
#attr greeting: string = "default";
greetingChanged() {
console.log("greeting changed:", this.greeting);
}
connectedCallback() {
super.connectedCallback();
console.log("connectedCallback");
}
} }
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<name-tag greeting="something"></name-tag>
</body>
</html>
The solution is to have the target property of the tsconfig.json file set to something other than ESNext. ES2016 works fine.
I'm attempting to switch out the css file on the fly - based on which part of the web-system the user is in (i.e. if the user is on mydomain/students/page then the page loads with students.min.css, rather than site.min.css).
I've tried doing it within the _Host.cshtml:
#page "/"
#namespace FIS2withSyncfusion.Pages
#addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
#{
Layout = null;
//sniff the requst path and switch the stylesheet accordingly
string path = Request.Path;
string css = "site.min.css";
if (path.ToLowerInvariant().StartsWith("/students"))
{
css = "students.min.css";
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Martin's Blazor Testing Site</title>
<base href="~/" />
<link rel="stylesheet" href="css/#(css)" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js"></script>
<script type="text/javascript">
function saveAsFile(filename, bytesBase64) {
if (navigator.msSaveBlob) {
//Download document in Edge browser
var data = window.atob(bytesBase64);
var bytes = new Uint8Array(data.length);
for (var i = 0; i < data.length; i++) {
bytes[i] = data.charCodeAt(i);
}
var blob = new Blob([bytes.buffer], { type: "application/octet-stream" });
navigator.msSaveBlob(blob, filename);
}
else {
var link = document.createElement('a');
link.download = filename;
link.href = "data:application/octet-stream;base64," + bytesBase64;
document.body.appendChild(link); // Needed for Firefox
link.click();
document.body.removeChild(link);
}
}
</script>
</head>
<body>
<component type="typeof(App)" render-mode="ServerPrerendered" />
<script src="_framework/blazor.server.js"></script>
<div id="blazor-error-ui">
<environment include="Staging,Production">
An error has occurred. This application may no longer respond until reloaded.
</environment>
<environment include="Development">
An unhandled exception has occurred. See browser dev tools for details.
</environment>
Reload
<a class="dismiss">đź—™</a>
</div>
</body>
</html>
However, it doesn't seem to hit this codeblock after the first load of the site; meaning whichever page they first landed on denotes the stylesheet for the entire site.
Do I have to put this codeblock on every page or is there another way of doing this?
another way you could approach this is to create components that respond to different styling that you desire. From there you have two options:
Create dedicated css associate with the component. From the docs
Create a class toggle in the code block of the component, similar to how the NavMenu works.
After further experimentation, I've found that adding this block:
#{
//sniff the requst path and switch the stylesheet accordingly
string path = navManager.Uri;
Uri uri = new Uri(path);
List<string> parts = uri.Segments.ToList();
string module = parts[1].ToLowerInvariant().Trim('/');
string css = "site.min.css";
if (module == "students")
{
css = "students.min.css";
}
}
<head>
<link rel="stylesheet" href="css/#(css)" />
</head>
To the top of MainLayout.razor works perfectly - so long as you remove the equivalent block from _Host.cshtml
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I have just installed the atom editor along with the p5 manager package using The Coding Train’s videos. I am trying to use Atom-live-server to view my code. However, when I hit “Start Server”, it opens up a new tab, with the server name, and doesn’t show any of what my code is supposed to do. Activating Javascript console ju
00%20AM Screen Shot 2019-06-20 at 10.54.00 AM.jpg 2173Ă—1134 241 KB st shows the following message: p5.sound.js:211 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio (anonymous) # p5.sound.js:211 p5.sound.js:4247 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio Tone.Context # p5.sound.js:4247 (index):53 Live reload enabled.
![40%20AM|466x313]
My sketch.js code is:
function setup() {
createCanvas(windowWidth, windowHeight);
}
function draw() {
background(255,255,255);
console.log(“HELLO”);
print(“HELLO”); }
My index.html code is:
robby1
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>robby1</title>
<script src="sketch.js"></script>
<script src="libraries/p5.js"></script>
<script src="libraries/p5.dom.js"></script>
<script src="libraries/p5.sound.js"></script>
<link rel="shortcut icon" href="">
<style>
body {
margin:0;
padding:0;
overflow: hidden;
}
canvas {
margin:auto;
}
</style>
</head>
<body>
</body>
</html>
To clarify, I am using chrome on a macOS mojave. I am unfamiliar with html, but know p5.js.
I have been fighting this issue for quite some time now, and have been (still) unable to print my div with its styling.
Currently, my script is:
$('#printMeButton').click(function () {
//alert("a");
var data = document.getElementById('thisPrintableTable').outerHTML;
var mywindow = window.open('', data);
mywindow.document.write('<html><head><title>Print Me!!!</title>');
// mywindow.document.write('<link rel="stylesheet" type="text/css" href="Site.css" media="screen">');
mywindow.document.write('</head><body>');
mywindow.document.write(data);
mywindow.document.write('</body></html>');
mywindow.document.close();
mywindow.focus();
mywindow.print();
mywindow.close();
return true;
});
which is nested within a $(document).ready function.
When I include the desired stylesheet (currently commented out), Nothing appears in the print preview.
I also have some script that has an effect on the appearance of the table, and, as such, I believe this may hold the key of having these included into the popup window.
How can i include this into the new popup?
Could someone please suggest a way of printing this as it stands?
Edit History
removed space at end of </head><body>
Changed var data to have outerHTML instead of innerHTML
Altered Question/details from better understanding of issue
Try to open a local html file using window.open with css linked within it. And set the content html to be printed to the local html file using js.
Here is the page to be printed:-
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link href="test.css" rel="stylesheet" type="text/css" />
<script src="jquery.js"></script>
</head>
<body>
<div id="print">
<div class="red">TODO write content</div>
</div>
<button id="print_btn">Print</button>
<script>
$('#print_btn').click(function(){
var newWindow = window.open('print.html','_blank');
$(newWindow).load(function(){
$(newWindow.document).find('body').html($('#print').html());
});
})
</script>
</body>
</html>
The css file test.css is linked here, and I'm opening print.html at the time of window.open, the test.css is also linked in the print.html
Now, in print.html I'll write:-
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link href="test.css" rel="stylesheet" type="text/css" />
</head>
<body>
</body>
</html>
Since you provide an empty string as a new window's URL (the first parameter of the open function), the page inside it most likely can't figure out where your stylesheet is (as it's address is "relative to nothing"). Try specifying an absolute URL to your stylesheet.
Also, there is media="screen" attribute that should be changed to media="print"
mywindow.document.write('<link rel="stylesheet" type="text/css" href="http://my.site/Site.css" media="print"')
The issue can be solved by introducing some delay time before executing mywindow.close(); method. Seems that some time is needed for CSS to be applied (loaded), like this:
$('#printMeButton').click(function () {
var content = document.getElementById(id).innerHTML;
var mywindow = window.open('', 'Print', 'height=600,width=800');
mywindow.document.write('<!DOCTYPE html><html dir="rtl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Print</title>');
mywindow.document.write('<link rel="stylesheet" type="text/css" href="/static/css/styles.css" />');
mywindow.document.write('</head><body >');
mywindow.document.write(content);
mywindow.document.write('</body></html>');
mywindow.document.close();
mywindow.focus()
mywindow.print();
// this is needed for CSS to load before printing..
setTimeout(function () {
mywindow.close();
}, 250);
return true;
});
We can use this inline style.
var divToPrint = document.getElementById('DivIdToPrint');
var newWin=window.open('','Print-Window');
newWin.document.open();
newWin.document.write('<html>' +
'<style>' +
".btn-petty-cash-split{display: none}"+
".btn-petty-cash-split{display: none}"+
'</style>' +
'<body onload="window.print()">'+divToPrint.innerHTML+'</body></html>');
newWin.document.close();
setTimeout(function(){
newWin.close();
window.location.reload();
},10);
My Goal is to use the Intel XDK Barcode scanner using the front camera on the iPhone or iPad.
Please help
I currently have the simple code snippet
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0" />
<style type="text/css">
* { -webkit-user-select:none; -webkit-tap-highlight-color:rgba(0, 0, 0, 0);
</style>
<script src='intelxdk.js'></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
var onDeviceReady=function(){
//hide splash screen
intel.xdk.device.hideSplashScreen();
//intel.xdk.device.scanBarcode();
};
document.addEventListener("intel.xdk.device.ready",onDeviceReady,false);
document.addEventListener("intel.xdk.device.barcode.scan", barcodeScanned, false);
function barcodeScanned(evt) {
intel.xdk.notification.beep(1);
if (evt.type == "intel.xdk.device.barcode.scan") {
if (evt.success == true) {
var url = evt.codedata;
//intel.xdk.device.showRemoteSite(url, 264, 0,56, 48)
alert(evt.codedata);
} else {
//scan cancelled
}
}
}
$(document).ready(function(){
$("#scanBtn").click(function(){
intel.xdk.device.scanBarcode();
});
});
</script>
</head>
<body>
Scan Now
</body>
</html>
The XDK does not currently support the use of the front camera. Such options will be possible when we are able to support the use of standard Cordova plugins.
Sorry, but I cannot comment on when new features will become available, Intel does not allow public disclosure of roadmaps and schedules.