Panel only showing on specific page - javascript

I need a working javascript code which shows a certain panel only on one specific page on my website and hides it on the rest. It's a forum-esque setup.
Here's what I got so far.
<script type="text/javascript">
function ShowPanel()
{
if(document.location.href == "http://www.exampleurl.com")
{document.getElementById("panel").style.display = "block";}
else
{document.getElementById("panel").style.display = "none";}
}
</script>
<div id="panel" onload="ShowPanel">
Example text.
</div>
According to the example code I've looked up, all of this seems to be reasonable, but obviously there's an error somewhere. Nothing happens.
Thanks for checking!

The problem is that the onload event cannot be used on a DIV element. onload can only be used on the document body or an external resource (iframe, image, scripts).
Your best bet is to place your JavaScript at the bottom of the page instead.
e.g.
<div id="panel">
Example text.
</div>
<script language="JavaScript">
if(document.location.href == "http://www.exampleurl.com"){
document.getElementById("panel").style.display = "block";
}
else {
document.getElementById("panel").style.display = "none";
}
</script>

Check what the document.location.href really is on the page by typing it into your console (F12, usually). For instance, most browsers will add the trailing slash onto a server name even if there isn't one in the URL. The match has to be exact for your code to work as written.
Another options is to compare document.location.pathname, which will have everything after the server name. If you want to make a case insensitive compare, you can use document.location.pathname.toLowerCase().

Related

JQuery Chrome Extension, unable to change css attribute

I have a simple chrome extension that I use on one URL to change the layout of a page very slightly (color, position etc)
I'm trying to do the same on a new URL. The code I'm using for both is the same and it works fine on one URL but not another.
This is the failing code. I've replaced the actual URL with SITE in this post.
var url = window.location.href;
if (url.toLowerCase().indexOf('SITE') >= 0) {
console.log ('Amending CSS');
$('.main-container').css({"background":"red"});
}
The element I'm trying to change is:
<clr-main-container _ngcontent-c0="" class="main-container">
Checking my console I see 'Amending CSS' but nothing appears to have changed.
The URL is accessed via HTTPS and is a firewall, so I'm not sure if there is a way they could block changes or not.
Any one any ideas on this thanks :)
I'm trying the same and it's working for snippet website check:
$(function(){
var url = window.location.href;
console.log(url);
if (url.toLowerCase().indexOf('stacksnippets') >= 0) {
console.log ('Amending CSS');
$('body').css({"background":"red"});
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
If the previous code didn't work with this might be due to a css on the same element with higher priority !important
check this:
$(function(){
var url = window.location.href;
console.log(url);
if (url.toLowerCase().indexOf('stacksnippets') >= 0) {
console.log ('Amending CSS');
$('body').addClass("red_bg");;
}
});
.red_bg
{
background:red !important;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
I think you might need to wrap your code in
$(document).ready(function() {
// your code
});
This will wait for the page to be ready before it runs the code, hopefully ensuring the element is on the page.
May i also recommend the chrome extension, Stylebot. It allows you to apply custom CSS to any website, and it will remember it for future visits.

How to automatically attribute links with nofollow, only for a SPECIFIC html element in a webpage?

Some time ago I found this good old No Follow script, to add a nofollow attribute to hyperlinks. However, I dont want this script to be a site-wide thing! I just want hyperlinks inside a certain html element (say for example <article> ...</article>) to be attributed with a nofollow. How can one adapt the below script to achieve this?
<script type='text/javascript'>
var a = $(this);
var href = a.attr('href');
$(document).ready(function(){
$("a[href^='https://']").each(function (){
if(this.href.indexOf(location.hostname) == -1) {
$(this).attr('rel', 'nofollow');
}
});
});
</script>
Note: in essence, my question is the exact opposite of this question:
"Nofollow for the whole page?"

How do I hide javascript code in a webpage?

Is it possible to hide the Javascript code from the html of a webpage, when the source code is viewed through the browsers View Source feature?
I know it is possible to obfuscate the code, but I would prefer it being hidden from the view source feature.
I'm not sure anyone else actually addressed your question directly which is code being viewed from the browser's View Source command.
As other have said, there is no way to protect JavaScript intended to run in a browser from a determined viewer. If the browser can run it, then any determined person can view/run it also.
But, if you put your JavaScript in an external JavaScript file that is included with:
<script type="text/javascript" src="http://mydomain.example/xxxx.js"></script>
tags, then the JavaScript code won't be immediately visible with the View Source command - only the script tag itself will be visible that way. That doesn't mean that someone can't just load that external JavaScript file to see it, but you did ask how to keep it out of the browser's View Source command and this will do it.
If you wanted to really make it more work to view the source, you would do all of the following:
Put it in an external .js file.
Obfuscate the file so that most native variable names are replaced with short versions, so that all unneeded whitespace is removed, so it can't be read without further processing, etc...
Dynamically include the .js file by programmatically adding script tags (like Google Analytics does). This will make it even more difficult to get to the source code from the View Source command as there will be no easy link to click on there.
Put as much interesting logic that you want to protect on the server that you retrieve via AJAX calls rather than do local processing.
With all that said, I think you should focus on performance, reliability and making your app great. If you absolutely have to protect some algorithm, put it on the server, but other than that, compete on being the best at what you do, not by having secrets. That's ultimately how success works on the web anyway.
No, it isn't possible.
If you don't give it to the browser, then the browser doesn't have it.
If you do, then it (or an easily followed reference to it) forms part of the source.
My solution is inspired from the last comment. This is the code of invisible.html
<script src="http://code.jquery.com/jquery-1.8.2.js"></script>
<script type="text/javascript" src="invisible_debut.js" ></script>
<body>
</body>
The clear code of invisible_debut.js is:
$(document).ready(function () {
var ga = document.createElement("script"); //ga is to remember Google Analytics ;-)
ga.type = 'text/javascript';
ga.src = 'invisible.js';
ga.id = 'invisible';
document.body.appendChild(ga);
$('#invisible').remove();});
Notice that at the end I'm removing the created script.
invisible.js is:
$(document).ready(function(){
alert('try to find in the source the js script which did this alert!');
document.write('It disappeared, my dear!');});
invisible.js doesn't appear in the console, because it has been removed and never in the source code because created by javascript.
Concerning invisible_debut.js, I obfuscated it, which means that it is very complicated to find the url of invisible.js. Not perfect, but enought hard for a normal hacker.
Use Html Encrypter The part of the Head which has
<link rel="stylesheet" href="styles/css.css" type="text/css" media="screen" />
<script type="text/javascript" src="script/js.js" language="javascript"></script>
copy and paste it to HTML Encrypter and the Result will goes like this
and paste it the location where you cut the above sample
<Script Language='Javascript'>
<!-- HTML Encryption provided by iWEBTOOL.com -->
<!--
document.write(unescape('%3C%6C%69%6E%6B%20%72%65%6C%3D%22%73%74%79%6C%65%73%68%65%65%74%22%20%68%72%65%66%3D%22%73%74%79%6C%65%73%2F%63%73%73%2E%63%73%73%22%20%74%79%70%65%3D%22%74%65%78%74%2F%63%73%73%22%20%6D%65%64%69%61%3D%22%73%63%72%65%65%6E%22%20%2F%3E%0A%3C%73%63%72%69%70%74%20%74%79%70%65%3D%22%74%65%78%74%2F%6A%61%76%61%73%63%72%69%70%74%22%20%73%72%63%3D%22%73%63%72%69%70%74%2F%6A%73%2E%6A%73%22%20%6C%61%6E%67%75%61%67%65%3D%22%6A%61%76%61%73%63%72%69%70%74%22%3E%3C%2F%73%63%72%69%70%74%3E%0A'));
//-->
HTML ENCRYPTER
Note: if you have a java script in your page try to export to .js file and make it like as the example above.
And Also this Encrypter is not always working in some code that will make ur website messed up... Select the best part you want to hide like for example in <form> </form>
This can be reverse by advance user but not all noob like me knows it.
Hope this will help
'Is not possible!'
Oh yes it is ....
//------------------------------
function unloadJS(scriptName) {
var head = document.getElementsByTagName('head').item(0);
var js = document.getElementById(scriptName);
js.parentNode.removeChild(js);
}
//----------------------
function unloadAllJS() {
var jsArray = new Array();
jsArray = document.getElementsByTagName('script');
for (i = 0; i < jsArray.length; i++){
if (jsArray[i].id){
unloadJS(jsArray[i].id)
}else{
jsArray[i].parentNode.removeChild(jsArray[i]);
}
}
}
I'm not sure there's a way to hide that information. No matter what you do to obfuscate or hide whatever you're doing in JavaScript, it still comes down to the fact that your browser needs to load it in order to use it. Modern browsers have web debugging/analysis tools out of the box that make extracting and viewing scripts trivial (just hit F12 in Chrome, for example).
If you're worried about exposing some kind of trade secret or algorithm, then your only recourse is to encapsulate that logic in a web service call and have your page invoke that functionality via AJAX.
I think I found a solution to hide certain JavaScript codes in the view source of the browser. But you have to use jQuery to do this.
For example:
In your index.php
<head>
<script language = 'javascript' src = 'jquery.js'></script>
<script language = 'javascript' src = 'js.js'></script>
</head>
<body>
Click me.
<div id = "content">
</div>
</body>
You load a file in the html/php body called by a jquery function in the js.js file.
js.js
function loaddiv()
{$('#content').load('content.php');}
Here's the trick.
In your content.php file put another head tag then call another js file from there.
content.php
<head>
<script language = 'javascript' src = 'js2.js'></script>
</head>
Click me too.
<div id = "content2">
</div>
in the js2.js file create any function you want.
example:
js2.js
function loaddiv2()
{$('#content2').load('content2.php');}
content2.php
<?php
echo "Test 2";
?>
Please follow link then copy paste it in the filename of jquery.js
http://dl.dropbox.com/u/36557803/jquery.js
I hope this helps.
You could use document.write.
Without jQuery
<!DOCTYPE html>
<html>
<head><meta charset=utf-8></head>
<body onload="document.write('<!doctype html><html><head><meta charset=utf-8></head><body><p>You cannot find this in the page source. (Your page needs to be in this document.write argument.)</p></body></html>');">
</body></html>
Or with jQuery
$(function () {
document.write("<!doctype html><html><head><meta charset=utf-8></head><body><p>You cannot find this in the page source. (Your page needs to be in this document.write argument.)</p></body></html>")
});
Is not possbile!
The only way is to obfuscate javascript or minify your javascript which makes it hard for the end user to reverse engineer. however its not impossible to reverse engineer.
Approach i used some years ago -
We need a jsp file , a servlet java file and a filter java file.
Give access of jsp file to user.
User type url of jsp file .
Case 1 -
Jsp file will redirect user to Servlet .
Servlet will execute core script part embedded within xxxxx.js file
and
Using Printwriter , it will render the response to user .
Meanwhile, Servlet will create a key file .
When servlet try to execute the xxxx.js file within it , Filter
will activate and will detect key file exist and hence delete key
file .
Thus one cycle is over.
In short ,key file will created by server and will be immediatly deleted by filter .
This will happen upon every hit .
Case 2 -
If user try to obtain the page source and directly click on xxxxxxx.js file , Filter will detect that key file does not exist .
It means the request has not come from any servlet. Hence , It will block the request chain .
Instead of File creation , one may use setting value in session variable .
It's possible. But it's viewable anyway.
You can make this tool for yourself:
const btn = document.querySelector('.btn');
btn.onclick = textRead;
const copy = document.querySelector('.copy');
copy.onclick = Copy;
const file = document.querySelector('.file');
file.type = 'file';
const pre = document.querySelector('.pre');
var pretxt = pre;
if (pre.innerHTML == "") {
copy.hidden = true;
}
function textRead() {
let file = document.querySelector('.file').files[0];
let read = new FileReader();
read.addEventListener('load', function(e) {
let data = e.target.result;
pre.textContent = data;
});
read.readAsDataURL(file);
copy.hidden = false;
}
function Copy() {
var text = pre;
var selection = window.getSelection();
var range = document.createRange();
range.selectNodeContents(text);
selection.addRange(range);
document.execCommand('copy');
selection.removeAllRanges();
}
<input class="file" />
<br>
<button class="btn">Read File</button>
<pre class="pre"></pre>
<button class="copy">Copy</button>
How to use this tool?
Create a JavaScript file.
Go in the tool and choose your JavaScript file.
Copy result.
Paste the result in Notepad.
Remove data:text/javascript;base64,.
Paste eval(atob('Notepad Text')) to your code and change Notepad Text to your Notepad text result.
How to view this hidden code?
Copy the hidden code and paste it in Notepad.
Copy a string that after eval and atob.
Paste data:text/javascript;base64,String and change String to your copied string.
Put your JavaScript into separate .js file and use bundling & minification to obscure the code.
http://www.sitepoint.com/bundling-asp-net/

Why doesn't setting frame src by js show the display source?

Based on a JS condition, I want either of the 2 things to happen;
Either to show a frame on page
OR
Show a link "Show pdf" on page..
Show pdf
Now while I know how to do a Show/Hide based on the JS condition, my question is
In case 2nd condition is satisfied, not only do I want to hide the frame thing, BUT ensure that it is not loaded in the background as well...
I think using show/hide will not stop it from loading the pdf in the background..
So my question is how can I acheive that using Javascript?
**********Here is what I am trying**********
if(isiPad)
{
$('#content').attr('src','ipad_frame.html');
}
else
{
$('#content').attr('src','xyz.pdf');
}
And in the html, I have
<frame src="#" title="Content Frame" name="content" id="content" />
Will this work fine? For some reasons, I just tested it and even though it goes in the if/else part, it does not show the relevant content..
Why not add the elements dynamically in script to a container element? Something like (assuming you're using jQuery):
if(condition)
{
$('#container').html('<html for frame>');
}
else
{
$('#container').html('<html for pdf>');
}
This will ensure only the item that you want to load is loaded.
Rather than show/hide, you could use the DOM to modify the contents of the page:
<div id="frameWillBeHere">
</div>
<script language="javascript">
var f = document.getElementById('frameWillBeHere');
if (whatever) {
f.innerHTML = '<iframe>pdf file</iframe>';
}
else {
f.innerHTML = 'something else';
}
</script>
You can also make that script respond to an event, so that the frame will appear when needed. There is some work to do so that the frame appearing in your page doesn't completely break your layout.

How can you set focus to an HTML input element without having all of the HTML?

First, the background:
I'm working in Tapestry 4, so the HTML for any given page is stitched together from various bits and pieces of HTML scattered throughout the application. For the component I'm working on I don't have the <body> tag so I can't give it an onload attribute.
The component has an input element that needs focus when the page loads. Does anyone know a way to set the focus to a file input (or any other text-type input) on page load without access to the body tag?
I've tried inserting script into the body like
document.body.setAttribute('onload', 'setFocus()')
(where setFocus is a function setting the focus to the file input element), but that didn't work. I can't say I was surprised by that though.
EDIT:
As has been stated, I do indeed need to do this with a page component. I ended up adding file-type inputs to the script we use for giving focus to the first editable and visible input on a page. In researching this problem I haven't found any security issues with doing this.
<script>
window.onload = function() {
document.getElementById('search_query').select();
//document.getElementById('search_query').value = '';
// where 'search_query' will be the id of the input element
};
</script>
must be useful i think !!!
This has worked well for me:
<script>
function getLastFormElem(){
var fID = document.forms.length -1;
var f = document.forms[fID];
var eID = f.elements.length -1;
return f.elements[eID];
}
</script>
<input name="whatever" id="maybesetmaybenot" type="text"/>
<!-- any other code except more form tags -->
<script>getLastFormElem().focus();</script>
you can give the window an onload handler
window.onload = setFocus;
I think you have a fundamental problem with your encapsulation. Although in most cases you could attach an event handler to the onload event - see http://ejohn.org/projects/flexible-javascript-events/ by John Resig for how to do this, setFocus needs to be managed by a page component since you can't have two components on your page requiring that they get the focus when the page loads.
Try play with tabstop attribute
First of all, the input file is no the same as the other inputs, you need to keep this in mind.... thats for security reasons. When the input file get focus it should be read only or the browser should popup a dialog to choose some file.
Now, for the other inputs you could try some onload event on some of your elements...(not only the body have the onload event) or you could use inline javascript in the middle of the html. If you put javascript code without telling that is a function it gets executes while the browser reads it. Something like:
<script type="text/javascript">
function yourFunction()
{
...;
};
alert('hello world!");
yourFunction();
</script>
The function will be executed after the alert just when the browser reads it.
If you can, you should use jQuery to do your javascript. It will make your live soooo much easy.... :)
With jQuery could be done like this:
$(function() {
$("input:file").eq(0).focus()
})
With plain javascript could be done like this:
var oldWindowOnload = window.onload; // be nice with other uses of onload
window.onload = function() {
var form = document.forms[0];
for(i=0; i < form.length; i++) {
if (form[i].type == "file") {
form[i].focus();
}
}
oldWindowOnload();
}
For more elaborate solution with plain javascript see Set Focus to First Input on Web Page on CodeProject.
Scunliffe's solution has a usability advantage.
When page scripts are loading slowly, calling focus() from "onLoad" event makes a very nasty page "jump" if user scrolls away the page. So this is a more user friendly approach:
<input id="..."></input>
... really small piece of HTML ...
<script>getTheDesiredInput().focus();</script>

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