How to have IFrame redraw everything at once - javascript

I am trying to make a markdown editor, but I am having an issue with my IFrame. It sets the IFrame source to about:blank to clear the screen, but it doesn't write to the iframe again until a key is pressed. How can I fix this?
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Markdown Edit</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="editor">
<textarea id="textbox" cols="30" rows="10" oninput="updatePreview()"></textarea>
</div>
<iframe frameborder="0" id="preview"></iframe>
<script src="https://cdnjs.cloudflare.com/ajax/libs/markdown-it/8.4.2/markdown-it.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<script src="scripts.js"></script>
</body>
</html>
JS:
window.onerror = function(msg, url, linenumber) {
alert('Error message: '+msg+'\nURL: '+url+'\nLine Number: '+linenumber);
return true;
}
var textbox = document.getElementById("textbox");
var preview = document.getElementById("preview");
var md = window.markdownit();
preview.contentWindow.document.open();
function updatePreview() {
preview.src = "about:blank";
preview.contentWindow.document.write(md.render(textbox.value));
}

Update
You could use jquery on key up function? So after the cuser has finished typing it will update?
$( "#target" ).keyup(function() {
#update iframe code here
});
You could refresh the iframe every 30 seconds?
<script>
window.setInterval("reloadIFrame();", 30000);
function reloadIFrame() {
document.frames["framename"].location.reload();
}
</script>
I always save this peace of code. It's great.

Related

Missing instance data Datepicker while using iframe and jquery dialog

There are two versions of code. The first version is there is a main page containing an iframe and dialog <div>. The iframe will load the dia.html into the parent <div id="popdiv"> and fire it as a dialog. The dialog itself will initiate a Datepicker with elem.datepicker();.
The second version is just the ideal version for what I want which is an iframe fire the parent main page dialog and have a Datepicker running. But this approach cannot load the dia.html page into the <div id="popdiv"> which is not as handy.
My question:
Why is that when I want to select the element$('#myInput', window.parent.document) in the dia.html, I need to add window.parent.document after selector?
I try to figure it out by checking the html code in development tools. But I had no idea why it is required. How does query Dialog work?
How to make the elem.datepicker(); inside the dia.html work inside the dialog if I want to use the .load('dia.html') approach? What was the reason it didn't work?
main.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css"
integrity="sha512-aOG0c6nPNzGk+5zjwyJaoRUgCdOrfSDhmMID2u4+OIslr0GjpLKo7Xm0Ao3xmpM4T8AmIouRkqwj1nrdVsLKEQ=="
crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.5.1.js"
integrity="sha256-QWo7LDvxbWT2tbbQ97B53yJnYU3WhH/C8ycbRAkjPDc=" crossorigin="anonymous"></script>
<script src="http://code.jquery.com/ui/1.12.0/jquery-ui.js"
integrity="sha256-0YPKAwZP7Mp3ALMRVB2i8GXeEndvCq3eSl/WsAl1Ryk=" crossorigin="anonymous"></script>
<script>
$(document).ready(function () {
});
</script>
</head>
<body>
<div id="popdiv"></div>
<iframe src="iframe1.html" height="800" width="800"></iframe>
</body>
</html>
iframe1.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css"
integrity="sha512-aOG0c6nPNzGk+5zjwyJaoRUgCdOrfSDhmMID2u4+OIslr0GjpLKo7Xm0Ao3xmpM4T8AmIouRkqwj1nrdVsLKEQ=="
crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.5.1.js"
integrity="sha256-QWo7LDvxbWT2tbbQ97B53yJnYU3WhH/C8ycbRAkjPDc=" crossorigin="anonymous"></script>
<script src="http://code.jquery.com/ui/1.12.0/jquery-ui.js"
integrity="sha256-0YPKAwZP7Mp3ALMRVB2i8GXeEndvCq3eSl/WsAl1Ryk=" crossorigin="anonymous"></script>
<script>
$(function () {
alert('opening iframe');
var parentDiv = $('#popdiv', window.parent.document);
parentDiv.load('dia.html');
parentDiv.dialog();
});
</script>
</head>
<body>
<p>iframe1</p>
</body>
</html>
dia.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css"
integrity="sha512-aOG0c6nPNzGk+5zjwyJaoRUgCdOrfSDhmMID2u4+OIslr0GjpLKo7Xm0Ao3xmpM4T8AmIouRkqwj1nrdVsLKEQ=="
crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.5.1.js"
integrity="sha256-QWo7LDvxbWT2tbbQ97B53yJnYU3WhH/C8ycbRAkjPDc=" crossorigin="anonymous"></script>
<script src="http://code.jquery.com/ui/1.12.0/jquery-ui.js"
integrity="sha256-0YPKAwZP7Mp3ALMRVB2i8GXeEndvCq3eSl/WsAl1Ryk=" crossorigin="anonymous"></script>
<script>
$(function () {
var elem = $('#myInput', window.parent.document);
alert(elem.val());
elem.datepicker();
});
</script>
</head>
<body>
<p>Date: </p>
<input id="myInput" value="22" />
</body>
</html>
working version
change it to not load html
iframe1.html (working)
<script>
$(function () {
alert('opening iframe');
var parentDiv = $('#popdiv', window.parent.document);
//parentDiv.load('dia.html');
parentDiv.dialog();
});
</script>
main.html (working)
<div id="popdiv">
<p>Date: </p>
<input id="myInput" value="22" />
<script>$('#myInput').datepicker();</script>
</div>

How do I prevent that the Client refresh the page?

I created a Node.js application and dont want that the Client is able to refresh the page or atleast give him a warning before he refresh it.
Here is my code for the client.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/css/materialize.min.css">
<script
src="https://code.jquery.com/jquery-3.3.1.js"
integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60="
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/js/materialize.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pusher/4.2.2/pusher.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/canvasjs/1.7.0/canvasjs.min.js"></script>
<script src="mainClients.js"></script>
<title>Clients</title>
</head>
<body onload="RunOnBeforeUnload()">
<div id ="main">
<div class="container" id = "1">
<h1 id="questionIndex"></h1>
<p id="question"></p>
<form id="vote-form">
</form>
<br><br>
</div>
<script type="text/javascript">
let url = window.location.search;
code = url.substr(url.indexOf("=")+1);
generatePageContents('questionIndex', 'question', 'vote-form', 'http://localhost:5000/QueryQuestion', code, 1)
</script>
<script type="text/javascript">
if(typeof(form) == 'undefined') {
const form = document.getElementById('vote-form');
vote(form, 'os', 'submitId', 'http://localhost:5000/poll');
}else {
vote(form, 'os', 'submitId', 'http://localhost:5000/poll');
}
</script>
<script type="text/javascript">
questionListener('topic-change', 'topic-change', 'questionIndex', 'question', 'vote-form', 'http://localhost:5000/QueryQuestion', code);
</script>
<script language="javascript">
function RunOnBeforeUnload() {window.onbeforeunload = function(){ return '!'; } }
</script>
</div>
</body>
</html>
Does anyone here know how to handle this task? I think it should be pretty easy but I cant find anything on the Internet

How do I fix Vue JS alert

I have a very simple index.html file that I am using to learn Vue. I have attached a click event on a button and it is supposed to alert the user.
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Hello Visitor</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" media="screen" href="main.css" />
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
</head>
<body>
<div class="container">
<div id="app">
{{ message }}
</div>
<input type="text"> </br> </br>
<button v-on:click="greet" class="btn btn-primary">Greet Me!</button>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<script src="main.js"></script>
</body>
</html>
main.js
new Vue({
el: '#app',
data: {
message: 'What is your name?'
},
methods: {
greet: function(){
alert("Hello to you too.");
},
}
});
I thought that the function needed the event param in the function but that did not help. Is there something that I am missing?
Your Vue app is bound to #app.
Stuff that happens outside that div, Vue doesn't parse or know about.
Move your button inside the #app div and it should function. You may also want to give your <button> a type="button" - that'll prevent it from trying to submit a form, which is the default behavior. (You can also do <button #click.prevent="greet"> to accomplish the same thing. The .prevent prevents the default behavior.)

Why is this JavaScript button click failing to call a function?

I am beginner of javascript.
but it doesn't work. plz help me.
I am using Microsoft VSCode.
This is my main.html.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta http-equiv="X-UA-Compatible" content="ie=edge"/>
<link rel="javascript" src="script.js"/>
<link rel="stylesheet" href="https://unpkg.com/papercss#1.4.1/dist/paper.min.css"/>
<link rel="stylesheet" href="style.css"/>
<title>Ultimate R-S-P</title>
</head>
<body>
<div class="login_box">
<h1><span class="badge" id="loginbtn">main</span>
</div>
</body>
</html>
This is script.js
console.log("start!");
var loginBtn = document.getElementById("loginbtn");
loginBtn.onclick = function(){
console.log("onclick event start");
};
You need change the:
<link rel="javascript" src="script.js"/>
into:
<script src="script.js"></script>
first choice:put script at the bottom of the body
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<script src="script.js"></script>
<link rel="stylesheet" href="https://unpkg.com/papercss#1.4.1/dist/paper.min.css" />
<link rel="stylesheet" href="style.css" />
<title>Ultimate R-S-P</title>
</head>
<body>
<div class="login_box">
<h1><span class="badge" id="loginbtn">main</span></h1>
</div>
<script>
console.log("start!");
var loginBtn = document.getElementById("loginbtn");
loginBtn.onclick = function() {
console.log("onclick event start");
};
</script>
</body>
</html>
second choice:move your script content to the window.onload=function(){}
window.onload = function() {
console.log("start!");
var loginBtn = document.getElementById("loginbtn");
loginBtn.onclick = function() {
console.log("onclick event start");
};
};
if you choose this,you have to change your script tag
<link rel="javascript" src="script.js"/>
to
<script src="script.js"></script>
The < link > tag defines a link between a document and an external resource.
The < link > tag is used to link to external style sheets.
The < script > tag is used to define a client-side script (JavaScript).
So, you need to change this code:
<link rel="javascript" src="script.js"/>
into this:
<script type="text/javascript" src="script.js"></script>
Use this tag not the link tag
<script src="script.js"></script>
Also fix your html you are missing an h1 end tag
<h1><span class="badge" id="loginbtn">main</span></h1>
Add Script tag as below.
You have used link tag instead of script.
<script type="text/javascript" src="script.js">
actually i was confused.
that was location of javascript.
solution
<body>
<div class="login_box">
<h1><span class="badge" id="loginbtn">main</span>
</div>
**<script type="text/javascript" src="script.js"></script>**
</body>
i put the javascript code in the body.

jQuery Knob doesn't trigger at event

I just want to trigger an event like release or change event with a jQuery knob. According to documentation, it should work with this:
<script>
$(".dial").knob({
'release' : function (v) { /*make something*/ }
});
</script>
In my code i have something very similar:
<html>
<head>
<meta charset="utf-8">
<link rel="icon" href="img/favicon.png">
<title>Knobs</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<script type="text/javascript" src="js/jquery-1.11.2.min.js"></script>
<script type="text/javascript" src="js/text.js"></script>
<script type="text/javascript" src="js/jquery.knob.min.js"></script>
</head>
<body>
<div class="knobBar">
<input id="gain1" class="knob"
data-angleOffset=-125
data-angleArc=250
data-bgColor="#262626"
data-fgColor="#00ff00"
data-rotation="clockwise"
value="0"
data-min="0"
data-max="100"
data-lineCap="round"
data-displayPrevious="true"
data-width="5%"
data-font="Advanced LED Board-7">
</body>
And I put this at the end of the html file:
<script>
//Listeners for Knobs changes
$(function () {
$('#gain1').knob({
'release': function (v) {
console.log(v);
gain_1.gain.value = v / 100;
}});
})
</script>
I just don't get it to work. It doesn't print anything to console, so obviously is not triggering the function.

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