I am very new to javascript but I can't go forward in learning because my console.log doesn't work AT ALL I will type in the console.log message and on my html page nothing shows up. i have try to debug it but I'm so new I don't know how all I can do is go to the forums and ask, it seem some people have the problem but, there is no good answer to the problem. I've tried every thing i know how to do (which isn't very much) but nothing works PLEASE HELP!!
this is my program
<html>
<head>
<title>My First proper HTML page</title>
</head>
<body>
<h1>Hello</h1>
<p>My First web page.</p>
<script type="text/javascript">
console.log("Hello World!"</script>
</body>
</html>
i know that it has to be in dev tool to see it now but how do i make it show up in the html not in dev.?
there has to be a way!
i now now that document.write is the right way but that isn't working either
<html>
<head>
<title>My First proper HTML page</title>
</head>
<body>
<h1>Hello</h1>
<p>My First web page.</p>
<script>
var name = "Nicholas";
document.write("Hello " + name);
if (name.length > 7 {
document.write("Wow you have a Really Long name!");
}
</script>
</body>
</html>
Technically, console.log is not supposed to show up on your HTML page. Rather, it shows up on your console's (web browser) log.
Even with all the correct answers provided, you can view your answer by visiting the Developer Tool -> Console (For Chrome, on Apple, it's Option + Command + J). For Windows, using Chrome, you hold the following keys: Ctrl+Shift+J
Here is a clip of the code and the log recorded by the console:
because you have to type console.log()
not control.log
Also, console.log needs to be either inside script tags, or in a separate javascript file. In your case you would have to do:
console.log("Hello, World!");
Try the below sample
<html>
<head>
<script type="text/javascript">
console.log("Hello World")
</script>
</head>
<body>
Hello
</body>
</html>
Unless you typed/edited your post.. that has an invalid Javascript.
<html>
<head>
<title>My First proper HTML page</title>
</head>
<body>
<h1>Hello</h1>
<p>My First web page.</p>
<script type="text/javascript">
console.log("Hello World!");
</script>
</body>
</html>
You did not have a closing )
Ah, as others have explained.. Console is not your HTML page, its part of the web browser itself. For example, in google chrome press CTRL+SHIFT+J to show it.
Your after document.write
Related
I started to learn javascript and I saw the following code in one of Javascript books:
<!DOCTYPE html>
<html>
<head>
<title>A Simple JavaScript Example</title>
</head>
<body>
<p>Printed before JavaScript is run.</p>
<p>
<script type=”text/javascript”>
document.write(“Printed by JavaScript.”);
</script>
</p>
<p>Printed after JavaScript is run.</p>
</body>
</html>
According to the book, three lines has to be printed. However, when I open this html file in the browser I see only the first and the last lines. The line "Printed by JavaScript" doesn't show.
Do you have any idea what can be the problem?
I guess it's because you used incorrect double quotes (wrong copy-paste from the book sample):
”
should become:
"
so that you have:
<script type="text/javascript">
document.write("Printed by JavaScript.");
</script>
Client-side Javascript can appear where within an HTML document?
A. Between the <head> and </head> tags
B. Between the <body>and </body> tags
C. Both of the above
D. None of the above
Here are codes that are placed in the different parts of the HTML. Ever variation will run no matter where the script tag is placed.
1.
<html>
<head>
<title>Foo</title>
<script type="text/javascript">
alert("hello world");
</script>
</head>
<body>
</body>
</html>
2.
<html>
<head>
<title>Foo</title>
</head>
<body>
<script type="text/javascript">
alert("hello world");
</script>
</body>
</html>
3.
<html>
<head>
<title>Foo</title>
</head>
<body>
</body>
<script type="text/javascript">
alert("hello world");
</script>
</html>
If you try out all these 3 variations where the script tags are placed in different parts of the HTML, you'll see that the alert() call will still run; regardless of their position in the HTML document.
So I think the answer to your question is:
C. Both of the above
Since there is no choice that says "Anywhere within the html document"
It is a good idea to place scripts at the bottom of the element.
This can improve page load, because HTML display is not blocked by scripts loading.
You should prefer here:
I chose "C" both of the above because the "Script" can be placed anywhere between the and < / body> as well as the < head> and < / head> It appears the most logical answer to go with in this situation is "C"
In Javascript, I want to open my window.html file in a popup window. But it doesn't display any text. Just a blank page.
This is index.html:
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css" />
<script language="javascript">
var newwindow;
function popit(url){
newwindow = window.open(
url, '', "status=yes, height=500; width=500; resizeable=0");
}
</script>
</head>
<body>
CLICK ME!
</body>
</html>
window.html:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<p>SAMPLE TEXT</p>
</body>
</html>
Why doesn't it display any text?
javascript:popit(window.html);
Replace with:
javascript:popit('window.html');
Your click handler code is syntactically incorrect:
CLICK ME!
Always, always have your developer console open to check for JavaScript errors! (edit — actually in this case there wouldn't have been an error; window.html would resolve to undefined probably! Still, keep the console open :-)
Also note that I used an "onclick" attribute instead of "href".
A GOOD working code with NO crashes.
Simple and what makes this code better is that you can use it in a JavaScript file separately and have it fairing to more then one file with the same popup size even though its different pages on popups.
Javascript
// Popup window code
function MyPopUp(url) {
popupWindow = window.open(
url,'popUpWindow','height=454,width=580,left=0,top=200,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no,status=yes')
}
HTML
My PopUp
NOTE: You can also use this as onload in body for example <body onload="JavaScript:MyPopUp('MyDirectory/Page.html');"> and it will aslo work on onmouseover and others... though I do not advise this unless you want to piss off the clients visiting your page.
I have just started learning Javascript and Ok here is a code I want to try and see it in the browser, so I create a test.js file and put this in it:
function useless(callback) {
return callback
}
var text = 'Amigo';
assert(
useless(function(){ return text; }) === text,
"The useless function works! " + text);
But still there is more, I should write a minimum HTML page than can call this function, What is sample HTML to host this method in it?
I have written something like this but still there is something wrong with it:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script src="hehe.js" >
useless('Amigo');
window.onload=useless('Amigo')
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript" src="hehe.js"></script>
<script >
useless('Amigo');
window.onload=useless('Amigo')
</script>
</body>
</html>
You can load the source in a separate script from the inline one that you call it in. Note that this assumes that hehe.js is in the root directory of your site.
For testing js in general jsFiddle is a nice resource that lets you define your html/js/css and experiment with small changes without having to write out all the files.
*Update: Ultimately I've decided that accomplishing exactly what I want here isn't possible due to the issues it poses to security. Kalle's answer below gives a solution that is closest to what I want to accomplish.
In order to solve my problem I've created scripts on both pages and will use a sort of push notification that is routed through the server in order for them to communicate.
Thanks for the help!! *
I have two pages. Both windows already exist independently. Page two has a function declared in JS.
I would like to be able to call the function in window two by clicking a link in window one.
Page 1:
<html>
<head>
<title>This is a title!</title>
</head>
<body style="background: lightblue">
Click Me!
</body>
Page 2:
<html>
<head>
<META HTTP-EQUIV="Window-target" CONTENT="my_target" />
<title>This is a title!</title>
<script type=text/javascript>
function clicked() {
alert('test');
}
</script>
</head>
<body style="background: lightblue">
</body>
Since it is on the same domain you can get this to work but would have to change the way you were doing it a little.
First off you would have to open it in a popup using this syntax rather than a new tab:
newwindow=window.open(url,'name','height=200,width=150');
and then you could simply call newwindow.clicked() after the popup is called.
update
just did a quick test and this will open it in a new tab. (sorry its been a while since I used the open function.
newwindow=window.open(url,'name');
Just noticed also that you should wait for the popup to load. So in my Example it would look a little something like this (with jQuery):
var newwindow = window.open('http://www.tylerbiscoe.com/vb/new.html');
$(newwindow).load(function(){
newwindow.clicked();
});
Ok, brand new answer. I hope this is what you were thinking. This is however, when you open page 2 from page 1.. So basically, page 1 would know who page 2 is..
Online example: http://kopli.pri.ee/stackoverflow/6832271.php
Page 1
<html>
<head>
<title>Page 1</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<style>
.ajaxlink {color: blue; cursor: pointer; border-bottom: 1px dotted blue;}
</style>
</head>
<body>
<span id="open_page_2" class="ajaxlink">Open new window</span>
<br>
<br>
Click Me!
<script>
$('#open_page_2').click(function(){
child = window.open('test2.php','page_2','width=600,height=600');
});
$('a[target=my_target]').click(function () {
child.SecondPageFunction();
return false;
});
</script>
</body>
</html>
Page 2
<html>
<head>
<title>Page 2</title>
</head>
<body>
<h1>Your seeing page 2!</h1>
<script>
function SecondPageFunction () {
alert('Second page action got triggered!');
}
</script>
</body>
</html>
The script must be a part of the page you're opening in the new window. You're absolutely correct about it being a security flaw if it was elsewise allowed.
You could add some query string argument that could be picked up onload by javascript in the page you are opening and call your function if the query string arg is present.