Hide html only when Javascript is available - javascript

I guess this is more about SEO than wanting to support browsers with Javascript disabled. I have Javascript/jQuery code that reads in some html and basically displays it much nicer. The html is actually removed (with jQuery's .remove() function) during the process.
So I hide the html so there aren't any visual artifacts as the page loads. But now I want to only hide it if Javascript is enabled. I guess the easiest thing is to have some Javascript in <head> that adds the display: none css rule to the appropriate elements.
Is there a better way for dealing with this situation?

I think using noscript html tag will do the job. The tag displays the content inside if the script is disabled in users browser.

Any JavaScript will only work if JavaScript is enabled so no matter how you do it using JavaScript it will always work only if JavaScript is enabled so you never have to test for that.
That having been said, you can see how it is done in the HTML5 Boilerplate:
<html class="no-js" lang="en">
... the rest of the page
</html>
using a no-js class applied to the <html> tag. The class is later removed using JavaScript and a js class is added, both of which you can use in your CSS and HTML:
<p class="js">This is displayed if JavaScript is enabled</p>
<p class="no-js">This is displayed if JavaScript is disabled</p>
Or in CSS:
.no-js #someWidget { display: none; }
.js #someFallback { display: none; }
If you're using Modernizr then it will already change those classes for you, but even if you don't then all you have to do is something like:
document.documentElement.className =
document.documentElement.className.replace(/\bno-js\b/,'js');
It's a simple and elegant solution and all you have to worry about is CSS classes in your styles and markup.

I'd probably use a single bit of script that sets a class on body you can then reference in your CSS, but basically, you're on the right track.
E.g.:
<body>
<script>document.body.className = "jsenabled";</script>
Then your CSS rule:
body.jsenabled selector_for_your_initially_hidden_content {
display: none;
}
The rule will only kick in if the body has the class.
Complete example:
HTML (and inline script):
<body>
<script>document.body.className = "jsenabled";</script>
<div class='foo'>I'm foo, I'm hidden on load</div>
<div>I'm not foo, I'm not hidden on load</div>
<div class='foo'>Another foo</div>
<div>Another bit not hidden on load.</div>
</body>
CSS:
body.jsenabled div.foo {
display: none;
}
Live copy I've only used the "foo" class for an example. It could just as easily be a structural selector.

Add the class hiddenblock to each div (or block) you want to hide, and add this JS code in the header:
$(document).ready(function() {
$(body).addClass('jsenable');
$('.hiddenblock').hide();
}
You can also use the class jsenable to mask or modify some other block, like this:
.jsenable #myblock { position: absolute; right: 10000px; }

Related

How to use the pseudo selectors in Inline Css in material UI? [duplicate]

I have a case where I must write inline CSS code, and I want to apply a hover style on an anchor.
How can I use a:hover in inline CSS inside the HTML style attribute?
E.g., you can't reliably use CSS classes in HTML emails.
Short answer: you can't.
Long answer: you shouldn't.
Give it a class name or an id and use stylesheets to apply the style.
:hover is a pseudo-selector and, for CSS, only has meaning within the style sheet. There isn't any inline-style equivalent (as it isn't defining the selection criteria).
Response to the OP's comments:
See Totally Pwn CSS with Javascript for a good script on adding CSS rules dynamically. Also see Change style sheet for some of the theory on the subject.
Also, don't forget, you can add links to external stylesheets if that's an option. For example,
<script type="text/javascript">
var link = document.createElement("link");
link.setAttribute("rel","stylesheet");
link.setAttribute("href","http://wherever.com/yourstylesheet.css");
var head = document.getElementsByTagName("head")[0];
head.appendChild(link);
</script>
Caution: the above assumes there is a head section.
You can get the same effect by changing your styles with JavaScript in the onMouseOver and onMouseOut parameters, although it's extremely inefficient if you need to change more than one element:
<a href="abc.html"
onMouseOver="this.style.color='#0F0'"
onMouseOut="this.style.color='#00F'" >Text</a>
Also, I can't remember for sure if this works in this context. You may have to switch it with document.getElementById('idForLink').
You could do it at some point in the past. But now (according to the latest revision of the same standard, which is Candidate Recommendation) you can't
.
You can't do exactly what you're describing, since a:hover is part of the selector, not the CSS rules. A stylesheet has two components:
selector {rules}
Inline styles only have rules; the selector is implicit to be the current element.
The selector is an expressive language that describes a set of criteria to match elements in an XML-like document.
However, you can get close, because a style set can technically go almost anywhere:
<html>
<style>
#uniqueid:hover {do:something;}
</style>
<a id="uniqueid">hello</a>
</html>
If you actually require inline code, this is possible to do. I needed it for some hover buttons, and the method is this:
.hover-item {
background-color: #FFF;
}
.hover-item:hover {
background-color: inherit;
}
<a style="background-color: red;">
<div class="hover-item">
Content
</div>
</a
In this case, the inline code: "background-color: red;" is the switch colour on hover. Use the colour you need and then this solution works. I realise this may not be the perfect solution in terms of compatibility, however this works if it is absolutely needed.
While it appears to be impossible to define a hover-rule inline, you can define the value of styles inline using a CSS variable:
:hover {
color: var(--hover-color);
}
<a style="--hover-color: green">
Library
</a>
Consider using an attribute or a class in addition to the selector (e.g., [hover-color]:hover) to allow coexistence with other low specificity hover color changing rules (from, e.g., a CSS reset or some elements using the default style).
Using JavaScript:
a) Adding inline style
document.head.insertAdjacentHTML('beforeend', '<style>#mydiv:hover{color:red;}</style>');
b) or a bit harder method - adding "mouseover"
document.getElementById("mydiv").onmouseover= function(e){this.className += ' my-special-class'; };
document.getElementById("mydiv").onmouseleave= function(e){this.className = this.className.replace('my-special-class',''); };
Note: multi-word styles (i.e.font-size) in JavaScript are written together:
element.style.fontSize="12px"
This is the best code example:
<a
style="color:blue;text-decoration: underline;background: white;"
href="http://aashwin.com/index.php/education/library/"
onmouseover="this.style.color='#0F0'"
onmouseout="this.style.color='#00F'">
Library
</a>
Moderator Suggestion: Keep your separation of concerns.
HTML
<a
style="color:blue;text-decoration: underline;background: white;"
href="http://aashwin.com/index.php/education/library/"
class="lib-link">
Library
</a>
JS
const libLink = document.getElementsByClassName("lib-link")[0];
// The array 0 assumes there is only one of these links,
// you would have to loop or use event delegation for multiples
// but we won't go into that here
libLink.onmouseover = function () {
this.style.color='#0F0'
}
libLink.onmouseout = function () {
this.style.color='#00F'
}
Inline pseudoclass declarations aren't supported in the current iteration of CSS (though, from what I understand, it may come in a future version).
For now, your best bet is probably to just define a style block directly above the link you want to style:
<style type="text/css">
.myLinkClass:hover {text-decoration:underline;}
</style>
Foo!
As pointed out, you cannot set arbitrary inline styles for hover, but you can change the style of the hover cursor in CSS using the following in the appropriate tag:
style="cursor: pointer;"
<style>a:hover { }</style>
Go Home
Hover is a pseudo class, and thus cannot be applied with a style attribute. It is part of the selector.
You can do this. But not in inline styles. You can use onmouseover and onmouseout events:
<div style="background: #333; padding: 10px; cursor: pointer"
onmouseover="this.style.backgroundColor='#555';" onmouseout="this.style.backgroundColor='#333';">
Hover on me!
</div>
According to your comments, you're sending a JavaScript file anyway. Do the rollover in JavaScript. jQuery's $.hover() method makes it easy, as does every other JavaScript wrapper. It's not too hard in straight JavaScript either.
There is no way to do this. Your options are to use a JavaScript or a CSS block.
Maybe there is some JavaScript library that will convert a proprietary style attribute to a style block. But then the code will not be standard-compliant.
You can write code in various type.
First I can write this
HTML
<a href="https://www.google.com/" onMouseOver="this.style.color='red'"
onMouseOut="this.style.color='blue'" class="one">Hello siraj</a>
CSS
.one {
text-decoration: none;
}
You can try another way:
HTML
Hello siraj
CSS
.one {
text-decoration: none;
}
.one:hover {
color: blue;
}
.one:active {
color: red;
}
You can also try hover in jQuery:
JavaScript
$(document).ready(function() {
$("p").hover(function() {
$(this).css("background-color", "yellow");
}, function() {
$(this).css("background-color", "pink");
});
});
HTML
<p>Hover the mouse pointer over this paragraph.</p>
In this code you have three functions in jQuery. First you ready a function which is the basic of a function of jQuery. Then secondly, you have a hover function in this function. When you hover a pointer to the text, the color will be changed and then next when you release the pointer to the text, it will be the different color, and this is the third function.
I just figured out a different solution.
My issue: I have an <a> tag around some slides/main content viewer as well as <a> tags in the footer. I want them to go to the same place in IE, so the whole paragraph would be underlined onHover, even though they're not links: the slide as a whole is a link. IE doesn't know the difference. I also have some actual links in my footer that do need the underline and color change onHover. I thought I would have to put styles inline with the footer tags to make the color change, but advice from above suggests that this is impossible.
Solution: I gave the footer links two different classes, and my problem was solved. I was able to have the onHover color change in one class, have the slides onHover have no color change/underline, and still able to have the external HREFS in the footer and the slides at the same time!
It's not exactly inline CSS, but it is inline.
<a href="abc.html" onMouseOver="this.style.color='#0F0'"
onMouseOut="this.style.color='#00F'">Text</a>
I agree with shadow. You could use the onmouseover and onmouseout event to change the CSS via JavaScript.
And don't say people need to have JavaScript activated. It's only a style issue, so it doesn't matter if there are some visitors without JavaScript ;)
Although most of Web 2.0 works with JavaScript. See Facebook for example (lots of JavaScript) or Myspace.
So this isn't quite what the user was looking for, but I found this question searching for an answer and came up with something sort of related. I had a bunch of repeating elements that needed a new color/hover for a tab within them. I use handlebars, which is key to my solution, but other templateing languages may also work.
I defined some colors and passed them into the handlebars template for each element. At the top of the template I defined a style tag, and put in my custom class and hover color.
<style type="text/css">
.{{chart.type}}-tab-hover:hover {
background-color: {{chart.chartPrimaryHighlight}} !important;
}
</style>
Then I used the style in the template:
<span class="financial-aid-details-header-text {{chart.type}}-tab-hover">
Payouts
</span>
You may not need the !important
While the "you shouldn't" context may apply there may be cases were you still want to achieve this. My use case was to dynamic set a hover color depending on some data value to achieve that with only CSS you can benefit from specificity.
Approach CSS only
CSS
/* Set your parent color for the inherit property */
.sidebar {
color: green;
}
/* Make sure your target element "inherit" parent color on :hover and default */
.list-item a {
color: inherit
}
.list-item a:hover {
color: inherit
}
/* Create a class to allows to get hover color from inline style */
.dynamic-hover-color:not(:hover) {
color: inherit !important;
}
Then your markup will be somewhat like:
Markup
<nav class="sidebar">
<ul>
<li class="list-item">
<a
href="/foo"
class="dynamic-hover-color"
style="color: #{{category.color}};"
>
Category
</a>
</li>
</ul>
</nav>
I'm doing this example using handlebars but the idea is that you take whatever is convenient for your use case to set the inline style (even if it is writing manually the color on hover you want)
You can just use an inline stylesheet statement like this:
<style>#T1:hover{color:red}</style><span id=T1>Your Text Here</span>
You can use the pseudo-class a:hover in external style sheets only. Therefore I recommend using an external style sheet. The code is:
a:hover {color:#FF00FF;} /* Mouse-over link */
You can do id by adding a class, but never inline.
<style>.hover_pointer{cursor:pointer;}</style>
<div class="hover_pointer" style="font:bold 12pt Verdana;">Hello World</div>
It is two lines, but you can reuse the class everywhere.
My problem was that I'm building a website which uses a lot of image-icons that have to be swapped by a different image on hover (e.g. blue-ish images turn red-ish on hover).
I produced the following solution for this:
.container div {
width: 100px;
height: 100px;
background-size: 100px 100px;
}
.container:hover .withoutHover {
display: none;
}
.container .withHover {
display: none;
}
.container:hover .withHover {
display: block;
}
<p>Hover the image to see it switch with the other. Note that I deliberately used inline CSS because I decided it was the easiest and clearest solution for my problem that uses more of these image pairs (with different URL's).
</p>
<div class=container>
<div class=withHover style="background-image: url('https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQrqRsWFJ3492s0t0NmPEcpTQYTqNnH188R606cLOHm8H2pUGlH')"></div>
<div class=withoutHover style="background-image: url('http://i.telegraph.co.uk/multimedia/archive/03523/Cat-Photo-Bombs-fa_3523609b.jpg')"></div>
</div>
I introduced a container containing the pair of images. The first is visible and the other is hidden (display:none). When hovering the container, the first becomes hidden (display:none) and the second shows up again (display:block).

How to override inline CSS that is already marked !important from external HTML

I am using HTML to input a cloud-based instagram feed on a website. I want to hide the bottom half of the feed that references the website of the publisher. The inline HTML that is outputting already has display: inline-block !important marked, so trying to hide it with display: none !important or visibility: hidden !important do not work. I am able to hide the entire block with CSS but not "parts" of it. I don't seem to be able to edit the HTML since it is coming from the cloud. The only HTML that I actually use on the site in order to make it render does not include any of the inline CSS, as it is only two lines.
Would someone mind explaining how this kind of thing works and why I am encountering issues overriding the inline CSS?
I have tried using:
display: inline !important, display: none !important and visibility: hidden !important
None of these are receiving priority, as the element.style in the chrome developer console clearly shows the inline CSS already marked as !important that I do not have access to, nor can I edit.
I simply want to hide one selector within the HTML. It is marked as "a"
a {
}
I have tried using this selector within the actual element, but it does not receive priority either. Nothing is working.
Try to remove the inline style with jQuery
$("#myDiv2").css("transform","");//used rotate to see the effect
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<div id="myDiv1" style="width:100px !important; height:100px !important;transform:rotate(30deg) !important">
//Some Content
</div>
<div id="myDiv2" style="width:100px !important; height:100px !important; transform:rotate(30deg) !important">
//Some Content
</div>
Setting the value of a style property to an empty string removes that property from an element.
$("#myDiv2").css("transform","");
Typically the only way to do this is to be more specific in your selector, for example selecting a[href][style] is more specific than just a. But since this is inline styles and already using !important you unfortunately might be out of luck!
a[href][style]{
color: green !important;
}
This link uses !important
<br/>
This link does not
If you wanted to just remove the links without importing several thousand lines of jQuery code, you can select and remove all <a> tags with just a few lines of plain JS.
document.querySelectorAll('a').forEach(link => {
link.remove();
});
<p> here is some text
This link uses !important
<br/>
This link does not
and some more text
</p>

Is it possible to create a Long Scroll Page (vertical) using only HTML and Javascript?

So I got this domain in a host site that allows only HTML and Javascript. The idea is to create a long scroll page, but the only way I find how to create it includes CSS. So I was hopeful that it can be done using only HTML and Javascript... Can it happen?
Hard to imagine a host site that doesn't allow CSS.
But, if that's the way you want to go, you can define all your CSS as inline styles inside your HTML, or, you can apply CSS through Javascript.
With regular javascript, it would look something like this
var blah= document.getElementById('whatever');
blah.style.background-color= "green";
With Jquery, it would look more like this
$('#whatever').css("background-color", "green");
You can do this for any CSS properties you want to add. Although, what Gavin Foster said is true, the overall height of your HTML document will adjust to fit the content so there is no additional CSS needed to make your page scroll up and down as long as there is content enough to fill up the page. The problem is, without CSS, you can't give anything a height, and therefore, you might end up with rather crowded-looking page and it might be hard to generate enough content to fill up the space you want to fill. The technique described above can solve this issue.
Alternately, you can define your CSS inside your HTML in 1 of 2 ways. You can either do something like this
<div style="background-color:blue;">This is a Blue Div</div>
Where you are simply adding all the CSS styles in the actual HTML tag for that element. This will make for an HTML document that has more clutter, and you won't be able to use and re-use classes.
Or, you can essentially put an entire CSS document in the head of your HTML document. Something like this:
<!DOCTYPE html>
<html lang="en"
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
body {
background-color: #00D1AC;
}
.whatever-class{
height: 500px;
width: 500px;
overflow: scroll;
}
</style>
</head>
<body>
... here, you put all the content of the body of the page
</body>
</html>
Where everything you would normally put inside a separate CSS document will instead be put inside of the <style> tag in your HTML head. This way, you can use classes as you normally would with CSS. This may be the easiest/laziest fix for your situation.

Disabling or hiding stylesheets, how do you do it?

I'm building a website that has to run entirely out of one window - it can never load another page. Consequently, I'm using a lot of JS to swap out the content that is displayed on the screen, and it's actually working rather well. However, I'm running out of good selectors and I don't want my stylesheet to get to be excessively long. So, I am wondering: is it possible to disable a stylesheet by placing it inside a div that is set to display:none?
For example:
<div style="display:none;">
<style type="text/css">
#my_image{
height:100px;
background-color:red;
}
</style>
</div>
<style type="text/css">
#my_image{
height:30px;
}
</style>
In this scenario, which of these would apply? I know that if both are loaded, the second one will be the latest one so it will be the one that is read. But let's say the div is not colored at all from the start. Would it be red when this script is run?
If this is not a viable solution to disable styles, then please inform me of what is.
You should ideally be using a separate stylesheet for each of your "themes".
You could then only load the correct stylesheet at runtime or:
Use javascript to create / destroy css link elements in the head
Use javascript to add a class to the body tag 'red' or 'blue' etc. Then have every selector in your theme begin with that class name:
.blue .header { background: red; }

Is linking a <div> using javascript acceptable?

I want to link an entire <div>, but CSS2 does not support adding an href to a div (or span for that matter). My solution is to use the onClick property to add a link. Is this acceptable for modern browsers?
Example code:
<div class="frommage_box" id="about_frommage" onclick="location.href='#';">
<div class="frommage_textbox" id="ft_1"><p>who is Hawk Design?</p></div>
My test page is at http://www.designbyhawk.com/pixel. Updated daily.
Thanks for the help.
You don't need to do that. There's a perfectly simple and standards-compliant way to do this.
Block-level elements will by default take up the entire available width. a elements are not by default block-level, but you can make them so with display: block in CSS.
See this example (no Javascript!). You can click anywhere in the div to access the link, even though the link text doesn't take up the whole width. You just need to remove that p element and make it an a.
Attaching a click event handler to a <div> element will work for your users with JavaScript enabled.
If you're looking for a progressive enhancement solution, however, you'll want to stick with a <a> element.
It is acceptable, only it's not good for SEO.
Maybe you can make a <a> element act like a div? (settings it's style to display:block etc.)
It will work in every browser(even IE6). The only problem with this is that search engines probably won't fetch it since it's javascript. I see no other way to be able to make an entire div click-able though. Putting an "a" tag around it won't work in all browsers.
If all you're trying to achieve is a large clickable box, try setting the following CSS on an anchor:
a {
display: block;
padding: 10px;
width: 200px;
height: 50px;
}
HTML:
<div class='frommage_box'>
<a href='location.html'>CONTENT GOES HERE</a>
</div>
CSS:
.frommage_box a{
display:block;
height:100%;
}
By default block elements take up 100% width. We adjust the height to 100%. And this will allow spiders to crawl yoru page.

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