Tesseract.js - Not working first time - javascript

I have a web page with a simple image OCR text.
I would like to get the text of this image with Tesseract.js. It's working fine except at first launch. The following message is displayed and nothing more:
initializing api (100%)
After reloading it's working fine. I don't know why it only work after reloading the page. If I clear the cache the issue reappears. I use Firefox.
My HTML/Javascript file
<html>
<head>
<title>QRScanner Library Test</title>
<script src="tesseract.js"></script>
</head>
<body>
<input type="button" id="go_button" value="Run" />
<div id="ocr_results"> </div>
<div id="ocr_status"> </div>
<img id="img" src="ocr.gif"/>
<script>
document.getElementById("go_button")
.addEventListener("click", function(e) {
var url = document.getElementById("img").src;
runOCR(url);
});
function runOCR(url) {
Tesseract.recognize(url)
.then(function(result) {
document.getElementById("ocr_results")
.innerText = result.text;
}).progress(function(result) {
document.getElementById("ocr_status")
.innerText = result["status"] + " (" +
(result["progress"] * 100) + "%)";
});
}
</script>
</body>
</html>
I have downloaded in the same folder all js files: tesseract.js, worker.js, index.js and language package eng.traineddata.gz

Related

Make HTML/CSS/Javascript not properly running on Tablet

I have wrote some basic HTML with some CSS and JavaScript. The code asks the user to enter a password and the Javascript verifies the password and alerts the user the required info. This code functions properly on my desktop but as soon as I add the files to my Samsung Tablet only the HTML appears. The code I'm using is as follows. Currently running all files out of same fodler but would like to move main HTML to tablet Home and leav CSS and Javascript in another location but still be referenced.
HTML
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="dowlingcss.css"/>
<title>
Dr. Dowling
</title>
</head>
<body>
<script src="dowlingjs.js"></script>
<img src="parasol.jpg" alt="Parasol Logo" height="250" width="750">
<h1>Welcome Dr. Dowling</h1>
<p>What is the answer?</P>
<form>
<input id="pass">
<button type="button" onclick="myfunction()">Login</button>
</form>
</body>
</html>
Javascript
function myfunction()
{
var x, text;
//Get the value of the input field with id="pass"
x = document.getElementById("pass").value;
var password = x.toLowerCase();
// If x is Not = to fatluke
if (password != "fatluke")
{
alert("incorrect");
}
else {
alert("The CD is in room 125 under the bed");
}
}
Add your code in this block of code for running and check after page load
window.onload = (function () {
// insert your code here
});
also, try with "window.getElementById()", I think it depends on your browser and version of web view on your tablet.

images are not rendering on website?

ive looked at other answers and none of them seemed to work which is why i decided to re-ask the question and show you guy my code so you can help me so here it is :
function searchForm() {
var body = document.getElementsByTagName('body')[0]
var search = document.getElementById('GIF-search').value;
var content = document.getElementById('content')
var xhr = $.get("http://api.giphy.com/v1/gifs/search?q=" + search + "&api_key=api");
xhr.done(function(data) {
var image = data;
var GIF = image['data'][0]['embed_url'];
var GIF_image = document.createElement('img');
GIF_image.setAttribute('src', GIF);
GIF_image.setAttribue('id', 'GIF');
content.appendChild(GIF_image)
});
}
var searchGIF = document.getElementById('search_GIF')
searchGIF.addEventListener('click', searchForm, false);
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>GIF viewer</title>
<style type="text/css">
#content {
width: 100%
}
img {
width: 250px;
height: 250px
}
</style>
</head>
<body>
<div id="Search">
<input type="text" name="" id="GIF-search">
<button id="search_GIF">Search GIFs</button>
</div>
<div id="content"></div>
<script src="jquery-3.2.1.js"></script>
<script src="GIFsearch.js"></script>
</body>
</html>
my problem here is that im getting a blank image on my site can anyone explain why this is happening and how i can fix it so it will actually show the GIF?
btw i know in the $.get("http://api.giphy.com/v1/gifs/search?q=" + search + "&api_key=api"); the apikey in not valid (this is on purpose);
Couple of things:
There was no jQuery in jsfiddle. Make sure you have it in your code.
Make https:// api call if your page is using https:// protocol.
setAttribute when you are setting id has got a typo. Look carefully.
URL you are getting at image['data'][0]['embed_url'] is not a image url but a webpage url. Try console log it and see. So you cant really set it as a src of some img tag. Find the correct image url and then proceed.

Position of script tag in html

I am trying to duplicate Expanding Text Areas Made Elegant
Basically it explains how we can achieve something like fb comment box, where its size increases as text files the textarea.
I have this in my index.html:
<html>
<head>
<link rel="stylesheet" type="text/css" href="test.css">
<script src="test.js"></script>
</head>
<body>
<figure>
<div class="expandingArea">
<pre><span></span><br></pre>
<textarea></textarea>
</div>
</figure>
</body>
</html>
And my test.js looks like:
This doesn't really works.
However if I move everything inside the js file to a script tag inside body then it works fine. So my index file would look like:
<html>
<head>
<link rel="stylesheet" type="text/css" href="test.css">
</head>
<body>
<figure>
<div class="expandingArea">
<pre><span></span><br></pre>
<textarea></textarea>
</div>
</figure>
<script>
function makeExpandingArea(container) {
var area = container.querySelector('textarea');
var span = container.querySelector('span');
if (area.addEventListener) {
area.addEventListener('input', function() {
span.textContent = area.value;
}, false);
span.textContent = area.value;
} else if (area.attachEvent) {
// IE8 compatibility
area.attachEvent('onpropertychange', function() {
span.innerText = area.value;
});
span.innerText = area.value;
}
// Enable extra CSS
container.className += ' active';
}var areas = document.querySelectorAll('.expandingArea');
var l = areas.length;while (l--) {
makeExpandingArea(areas[l]);
}
</script>
</body>
</html>
You're not actually using onload
Your formatting is so messed up it's hard to tell, but your init code is in a while loop at the bottom after your onload function.
When you include it in the <head> it runs before any elements exist. That's why the position of it matters.
In your browser(I recommend Chrome for testing) open up the developer tools(via right click and selecting inspect element) and make sure your test.js file's path is correct. Do this by selecting the 'Sources' tab on the top of the developer tools window and then selecting the test.js file on the list of sources.
I also consider it best practice to load your js files at the bottom of your web documents(before the last body tag) to guarantee they load AFTER your dom elements load.
try this in your code:
I have used inside a table andapply a css class "form-control". The properties of this text areas are in side tag in side
html code:
<html>
<body>
<table>
<tr>
<td>Description:</td>
<td><textarea name="DESCRIPTION" id="DESCRIPTION" class="form-control"></textarea></td>
<td></td>
</tr>
</table>
//css-code required inside html:
<style>
textarea.form-control {
height: auto;
resize: none;
width: 300px;
}
</style>
</body>
</html>

Make header and footer files to be included in multiple html pages

I want to create common header and footer pages that are included on several html pages.
I'd like to use javascript. Is there a way to do this using only html and JavaScript?
I want to load a header and footer page within another html page.
You can accomplish this with jquery.
Place this code in index.html
<html>
<head>
<title></title>
<script
src="https://code.jquery.com/jquery-3.3.1.js"
integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60="
crossorigin="anonymous">
</script>
<script>
$(function(){
$("#header").load("header.html");
$("#footer").load("footer.html");
});
</script>
</head>
<body>
<div id="header"></div>
<!--Remaining section-->
<div id="footer"></div>
</body>
</html>
and put this code in header.html and footer.html, at the same location as index.html
click here for google
Now, when you visit index.html, you should be able to click the link tags.
I add common parts as header and footer using Server Side Includes. No HTML and no JavaScript is needed. Instead, the webserver automatically adds the included code before doing anything else.
Just add the following line where you want to include your file:
<!--#include file="include_head.html" -->
Must you use html file structure with JavaScript? Have you considered using PHP instead so that you can use simple PHP include object?
If you convert the file names of your .html pages to .php - then at the top of each of your .php pages you can use one line of code to include the content from your header.php
<?php include('header.php'); ?>
Do the same in the footer of each page to include the content from your footer.php file
<?php include('footer.php'); ?>
No JavaScript / Jquery or additional included files required.
NB You could also convert your .html files to .php files using the following in your .htaccess file
# re-write html to php
RewriteRule ^(.*)\.html$ $1.php [L]
RewriteRule ^(.+)/$ http://%{HTTP_HOST}/$1 [R=301,L]
# re-write no extension to .php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]
You could also put: (load_essentials.js:)
document.getElementById("myHead").innerHTML =
"<span id='headerText'>Title</span>"
+ "<span id='headerSubtext'>Subtitle</span>";
document.getElementById("myNav").innerHTML =
"<ul id='navLinks'>"
+ "<li><a href='index.html'>Home</a></li>"
+ "<li><a href='about.html'>About</a>"
+ "<li><a href='donate.html'>Donate</a></li>"
+ "</ul>";
document.getElementById("myFooter").innerHTML =
"<p id='copyright'>Copyright © " + new Date().getFullYear() + " You. All"
+ " rights reserved.</p>"
+ "<p id='credits'>Layout by You</p>"
+ "<p id='contact'><a href='mailto:you#you.com'>Contact Us</a> / "
+ "<a href='mailto:you#you.com'>Report a problem.</a></p>";
<!--HTML-->
<header id="myHead"></header>
<nav id="myNav"></nav>
Content
<footer id="myFooter"></footer>
<script src="load_essentials.js"></script>
I tried this:
Create a file header.html like
<!-- Meta -->
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<!-- JS -->
<script type="text/javascript" src="js/lib/jquery-1.11.1.min.js" ></script>
<script type="text/javascript" src="js/lib/angular.min.js"></script>
<script type="text/javascript" src="js/lib/angular-resource.min.js"></script>
<script type="text/javascript" src="js/lib/angular-route.min.js"></script>
<link rel="stylesheet" href="css/bootstrap.min.css">
<title>Your application</title>
Now include header.html in your HTML pages like:
<head>
<script type="text/javascript" src="js/lib/jquery-1.11.1.min.js" ></script>
<script>
$(function(){ $("head").load("header.html") });
</script>
</head>
Works perfectly fine.
I've been working in C#/Razor and since I don't have IIS setup on my home laptop I looked for a javascript solution to load in views while creating static markup for our project.
I stumbled upon a website explaining methods of "ditching jquery," it demonstrates a method on the site does exactly what you're after in plain Jane javascript (reference link at the bottom of post). Be sure to investigate any security vulnerabilities and compatibility issues if you intend to use this in production. I am not, so I never looked into it myself.
JS Function
var getURL = function (url, success, error) {
if (!window.XMLHttpRequest) return;
var request = new XMLHttpRequest();
request.onreadystatechange = function () {
if (request.readyState === 4) {
if (request.status !== 200) {
if (error && typeof error === 'function') {
error(request.responseText, request);
}
return;
}
if (success && typeof success === 'function') {
success(request.responseText, request);
}
}
};
request.open('GET', url);
request.send();
};
Get the content
getURL(
'/views/header.html',
function (data) {
var el = document.createElement(el);
el.innerHTML = data;
var fetch = el.querySelector('#new-header');
var embed = document.querySelector('#header');
if (!fetch || !embed) return;
embed.innerHTML = fetch.innerHTML;
}
);
index.html
<!-- This element will be replaced with #new-header -->
<div id="header"></div>
views/header.html
<!-- This element will replace #header -->
<header id="new-header"></header>
The source is not my own, I'm merely referencing it as it's a good vanilla javascript solution to the OP. Original code lives here: http://gomakethings.com/ditching-jquery#get-html-from-another-page
The question asks about using only HTML and JavaScript. The problem is that a second request to the server using JavaScript or even jQuery (requesting the extra header.html "later") is:
Slow!
So, this is unacceptable in a production environment. The way to go is to include only one .js file and serve your HTML template using only this .js file. So, in your HTML you can have:
<script defer src="header.js"></script>
<header id="app-header"></header>
And then, in your header.js put your template. Use backticks for this HTML string:
let appHeader = `
<nav>
/*navigation or other html content here*/
</nav>
`;
document.getElementById("app-header").innerHTML = appHeader;
This has also the benefit, that you can change the content of your template dynamically if you need! (If you want your code clean, my recommendation is not to include any other code in this header.js file.)
Explanation about speed
In the HTTP/2 world, the web server "undestands" what additional files (.css, .js, etc) should be sent along with a specific .html, and sends them altogether in the initial response. But, if in your "original" .html you do not have this header.html file imported (because you intend to call it later with a script), it won't be sent initially. So, when your JavaScript/jQuery requests it (this will happen much later, when HTML and your JavaScript will get "interpreted"), your browser will send a second request to the server, wait for the answer, and then do its stuff... That's why this is slow. You can validate this, using any browser's developer tools, watching the header.html coming much later.
So, as a general advice (there are a lot of exceptions of course), import all your additional files in your original .html (or php) file if you care about speed. Use defer if needed. Do not import any files later using JavaScript.
I think, answers to this question are too old... currently some desktop and mobile browsers support HTML Templates for doing this.
I've built a little example:
Tested OK in Chrome 61.0, Opera 48.0, Opera Neon 1.0, Android Browser 6.0, Chrome Mobile 61.0 and Adblocker Browser 54.0
Tested KO in Safari 10.1, Firefox 56.0, Edge 38.14 and IE 11
More compatibility info in canisue.com
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>HTML Template Example</title>
<link rel="stylesheet" href="styles.css">
<link rel="import" href="autoload-template.html">
</head>
<body>
<div class="template-container">1</div>
<div class="template-container">2</div>
<div class="template-container">3</div>
<div class="template-container">4</div>
<div class="template-container">5</div>
</body>
</html>
autoload-template.html
<span id="template-content">
Template Hello World!
</span>
<script>
var me = document.currentScript.ownerDocument;
var post = me.querySelector( '#template-content' );
var container = document.querySelectorAll( '.template-container' );
//alert( container.length );
for(i=0; i<container.length ; i++) {
container[i].appendChild( post.cloneNode( true ) );
}
</script>
styles.css
#template-content {
color: red;
}
.template-container {
background-color: yellow;
color: blue;
}
Your can get more examples in this HTML5 Rocks post
Aloha from 2018. Unfortunately, I don't have anything cool or futuristic to share with you.
I did however want to point out to those who have commented that the jQuery load() method isn't working in the present are probably trying to use the method with local files without running a local web server. Doing so will throw the above mentioned "cross origin" error, which specifies that cross origin requests such as that made by the load method are only supported for protocol schemes like http, data, or https. (I'm assuming that you're not making an actual cross-origin request, i.e the header.html file is actually on the same domain as the page you're requesting it from)
So, if the accepted answer above isn't working for you, please make sure you're running a web server. The quickest and simplest way to do that if you're in a rush (and using a Mac, which has Python pre-installed) would be to spin up a simple Python http server. You can see how easy it is to do that here.
I hope this helps!
It is also possible to load scripts and links into the header.
I'll be adding it one of the examples above...
<!--load_essentials.js-->
document.write('<link rel="stylesheet" type="text/css" href="css/style.css" />');
document.write('<link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />');
document.write('<script src="js/jquery.js" type="text/javascript"></script>');
document.getElementById("myHead").innerHTML =
"<span id='headerText'>Title</span>"
+ "<span id='headerSubtext'>Subtitle</span>";
document.getElementById("myNav").innerHTML =
"<ul id='navLinks'>"
+ "<li><a href='index.html'>Home</a></li>"
+ "<li><a href='about.html'>About</a>"
+ "<li><a href='donate.html'>Donate</a></li>"
+ "</ul>";
document.getElementById("myFooter").innerHTML =
"<p id='copyright'>Copyright © " + new Date().getFullYear() + " You. All"
+ " rights reserved.</p>"
+ "<p id='credits'>Layout by You</p>"
+ "<p id='contact'><a href='mailto:you#you.com'>Contact Us</a> / "
+ "<a href='mailto:you#you.com'>Report a problem.</a></p>";
<!--HTML-->
<header id="myHead"></header>
<nav id="myNav"></nav>
Content
<footer id="myFooter"></footer>
<script src="load_essentials.js"></script>
For a quick setup with plain javascript and because not answered yet, you could also use a .js file to store your redundant pieces (templates) of HTML inside a variable and insert it through innerHTML.
backticks are here the make it easy part this answer is about.
(you will also want to follow the link on that backticks SO Q/A if you read & test that answer).
example for a navbar that remains the same on each page :
<nav role="navigation">
<img src="image.png" alt="Home"/>
<a href="/about.html" >About</a>
<a href="/services.html" >Services</a>
<a href="/pricing.html" >Pricing</a>
<a href="/contact.html" >Contact Us</a>
</nav>
You can keep inside your HTMl :
<nav role="navigation"></nav>
and set inside nav.js file the content of <nav> as a variable in between backticks:
const nav= `
<img src="image.png" alt="Home"/>
<a href="/about.html" >About</a>
<a href="/services.html" >Services</a>
<a href="/pricing.html" >Pricing</a>
<a href="/contact.html" >Contact Us</a>
` ;
Now you have a small file from which you can retrieve a variable containing HTML. It looks very similar to include.php and can easily be updated without messing it up (what's inside the backticks).
You can now link that file like any other javascript file and innerHTML the var nav inside <nav role="navigation"></nav> via
let barnav = document.querySelector('nav[role="navigation"]');
barnav.innerHTML = nav;
If you add or remove pages, you only have to update once nav.js
basic HTML page can be :
// code standing inside nav.js for easy edit
const nav = `
<img src="image.png" alt="Home"/>
<a href="/about.html" >About</a>
<a href="/services.html" >Services</a>
<a href="/pricing.html" >Pricing</a>
<a href="/contact.html" >Contact Us</a>
`;
nav[role="navigation"] {
display: flex;
justify-content: space-around;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Home</title>
<!-- update title if not home page -->
<meta name="description" content=" HTML5 ">
<meta name="author" content="MasterOfMyComputer">
<script src="nav.js"></script>
<!-- load an html template through a variable -->
<link rel="stylesheet" href="css/styles.css?v=1.0">
</head>
<body>
<nav role="navigation">
<!-- it will be loaded here -->
</nav>
<h1>Home</h1>
<!-- update h1 if not home page -->
<script>
// this part can also be part of nav.js
window.addEventListener('DOMContentLoaded', () => {
let barnav = document.querySelector('nav[role="navigation"]');
barnav.innerHTML = nav;
});
</script>
</body>
</html>
This quick example works & can be copy/paste then edited to change variable names and variable HTML content.
another approach made available since this question was first asked is to use reactrb-express (see http://reactrb.org) This will let you script in ruby on the client side, replacing your html code with react components written in ruby.
Use ajax
main.js
fetch("./includes/header.html")
.then(response => {
return response.text();
})
.then(data => {
document.querySelector("header").innerHTML = data;
});
fetch("./includes/footer.html")
.then(response => {
return response.text();
})
.then(data => {
document.querySelector("footer").innerHTML = data;
});
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Liks</title>
<link rel="stylesheet" href="css/styles.css">
</head>
<body>
<header></header>
<main></main>
<footer></footer>
<script src="/js/main.js"></script>
</body>
</html>
You can use object tag of HTML with out use of JavaScript.
<object data="header.html" type="text/html" height="auto"></object>
Credits : W3 Schools How to Include HTML
Save the HTML you want to include in an .html file:
Content.html
Google Maps<br>
Animated Buttons<br>
Modal Boxes<br>
Animations<br>
Progress Bars<br>
Hover Dropdowns<br>
Click Dropdowns<br>
Responsive Tables<br>
Include the HTML
Including HTML is done by using a w3-include-html attribute:
Example
<div w3-include-html="content.html"></div>
Add the JavaScript
HTML includes are done by JavaScript.
<script>
function includeHTML() {
var z, i, elmnt, file, xhttp;
/*loop through a collection of all HTML elements:*/
z = document.getElementsByTagName("*");
for (i = 0; i < z.length; i++) {
elmnt = z[i];
/*search for elements with a certain atrribute:*/
file = elmnt.getAttribute("w3-include-html");
if (file) {
/*make an HTTP request using the attribute value as the file name:*/
xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4) {
if (this.status == 200) {elmnt.innerHTML = this.responseText;}
if (this.status == 404) {elmnt.innerHTML = "Page not found.";}
/*remove the attribute, and call this function once more:*/
elmnt.removeAttribute("w3-include-html");
includeHTML();
}
}
xhttp.open("GET", file, true);
xhttp.send();
/*exit the function:*/
return;
}
}
}
</script>
Call includeHTML() at the bottom of the page:
Example
<!DOCTYPE html>
<html>
<script>
function includeHTML() {
var z, i, elmnt, file, xhttp;
/*loop through a collection of all HTML elements:*/
z = document.getElementsByTagName("*");
for (i = 0; i < z.length; i++) {
elmnt = z[i];
/*search for elements with a certain atrribute:*/
file = elmnt.getAttribute("w3-include-html");
if (file) {
/*make an HTTP request using the attribute value as the file name:*/
xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4) {
if (this.status == 200) {elmnt.innerHTML = this.responseText;}
if (this.status == 404) {elmnt.innerHTML = "Page not found.";}
/*remove the attribute, and call this function once more:*/
elmnt.removeAttribute("w3-include-html");
includeHTML();
}
}
xhttp.open("GET", file, true);
xhttp.send();
/*exit the function:*/
return;
}
}
};
</script>
<body>
<div w3-include-html="h1.html"></div>
<div w3-include-html="content.html"></div>
<script>
includeHTML();
</script>
</body>
</html>

Google Chrome Extensions: Passing user highlighted webpage text to a browser_action

I'm working on a Chrome extension where I need to pass highlighted text into a browser_action. I found the following code in a Google Group, and at the time it was written it was still valid - but it doesn't work anymore..
Does anyone know an alternative solution?
background.html:
<html>
<head>
<script type="text/javascript">
var selection_callbacks = [];
function getSelection(callback) {
selection_callbacks.push(callback);
chrome.tabs.executeScript(null, { file: "contentscript.js" });
};
chrome.extension.onRequest.addListener(function (request) {
var callback = selection_callbacks.shift();
callback(request);
});
</script>
</head>
<body>
</body>
</html>
popup.html:
<html>
<head>
<script type="text/javascript">
function onSelection(text) {
document.getElementById("output").innerHTML = text;
}
chrome.extension.getBackgroundPage().getSelection(onSelection);
</script>
</head>
<body>
<div id="output">
This should be replaced with the selected text
</div>
</body>
</html>
contentscript.js:
chrome.extension.sendRequest(window.getSelection().toString());
You could use a real content script instead of injecting JavaScript into the page with chrome.extension.executeScript. You could then have background.html ask the content script for the selection using chrome.tabs.sendRequest.

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