I created the code below to detect if Chrome add padding: 28% if all other browsers add margin: 28%. It's not working as expected and Im curious where I went wrong?
var chromeFix = document.getElementById('#slide-container');
if(navigator.userAgent.toLowerCase().indexOf('chrome') > -1) {
chromeFix.style.padding += 28%;
} else {
chromeFix.style.margin += 28%;
}
As an alternate to this messy hack, I would suggest looking into a css reset. Each browser has it's own user agent’ stylesheet, a css reset is designed to clear these styles for cross browser consistency
From http://cssreset.com/what-is-a-css-reset/
What Is A CSS Reset?
A CSS Reset (or “Reset CSS”) is a short, often compressed (minified) set of CSS rules that resets the styling of all HTML elements to a consistent baseline.
Why Use A CSS Reset?
You might wonder what this is all for – well, it’s simple. From the consistent base that you’ve set up via your reset, you can then go on to re-style your document, safe in the knowledge that the browsers’ differences in their default rendering of HTML can’t touch you!
Normalize.css is a commonly used css reset
https://necolas.github.io/normalize.css/
Just make sure this is the first css reference in your page as it is designed to override, and it will!
Here's a jQuery solution I found....
if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1) {
$('#slide-container').css('padding-top', '28%');
} else {
$('#slide-container').css('margin-top', '28%');
}
Anyone know the proper syntax/way to write the above in pure JS?
Related
I learned html and css a week ago. I completed my first project only to find that a div tag I used was not resizing to mobile formats. I have done some research and it seems the answer may reside with JQuery or .JS. I am working within a contained environment, Wordpress.com, and I don't know Java Script yet, but I am familiar with if then statements from studying logic for years.
So I effectively have two problems:
Can I use JQuery with inline html: no css?
How do I do it?
I know I am way off here. I am in the process of going through a .JS tutorial on codeacademy, but I am not finished.
Just thought I would try for advice here. I may not even be in the ballpark!
Here is my div tag and here is what I attempted:
<div style="width:950px;height:5px;background-color:#FFFFFF;"></div>
$(window).resize(function() {
if ($(this).width() < 951) {
$('.divIWantedToHide').hide(<div style="width:950px;height:5px;background-color:#FFFFFF;"></div>);
} else {
$('.divIWantedToHide').show(<div style="width:450px;height:5px;background-color:#FFFFFF;"></div>);
}
});
Javascript is kind of over-kill for this kind of thing.
I would suggest using CSS media queries.
Paste this in and it should work just fine :)
<style>
#YourDiv{
height:5px;
background-color:#FFFFFF;
}
#media only screen and (min-width:951px){
#YourDiv{width:950px;}
}
#media only screen and (max-width:950px){
#YourDiv{width:450px;}
}
</style>
<div id="YourDiv"></div>
Instead of having your style defined in the div tag, your div now has a unique name (an id) that can be styled separately. This is incredibly useful, and most would argue necessary, once you start building more complicated pages. The #media tags do basically the same thing as your if statements, where min-width:951px will set the style when your window is AT LEAST 951px and max-width:950px sets the style when your window is AT MOST 950px. The rest of the styles that don't change are set above ONE time because they are the same regardless of window size.
And now, just for fun I'll show you how to do it in pure Javascript as well:
http://jsfiddle.net/AfKU9/1/ (test it out by changing the preview window size)
<script>
var myDiv = document.getElementById("myDiv");
window.onresize = function(){
var w = window.innerWidth;
if (w > 600){
myDiv.setAttribute("style",'position:absolute;height:50px;background-color:#CCC;width:400px;' )
}
else{
myDiv.setAttribute("style", 'position:absolute;height:50px;background-color:#333;width:100px;' )
}
}
</script>
$('.divIWantedToHide').hide() will hide the div !!
In order to apply css to this div you need to use css:
$('.divIWantedToHide').css('width':'950px','height':'5px','background-color':'#FFFFFF');
If you want to append any div and apply css to it then use append/html
$('.divIWantedToHide').append('<div style="width:950px;height:5px;background-color:#FFFFFF;"></div>');
or
$('.divIWantedToHide').html('<div style="width:950px;height:5px;background-color:#FFFFFF;"></div>');
No, at wordpress.com you won't be able to use inline JavaScript. Not in regular posts using the HTML editor nor using the Custom Design upgrade that only includes a CSS editor.
Maybe you'll benefit from the following:
Preprocessor
WordPress.com has support for CSS preprocessors LESS and Sass (SCSS Syntax). This is an advanced option for users who wish to take advantage of CSS extensions like variables and mixins. See the LESS and Sass websites for more information. You can select which syntax you would prefer to use at the bottom of the Appearance -> Customize -> CSS panel.
If you want to resize or apply another style to some elements adapted to the device screen size, yout can just use the #media css property.
#your_div_id {
width: 950px;
/* ... */
}
#media (max-width: 38em) {
#your_div_id {
display:none;
}
}
You are trying to hide a div with class '.divIWantedToHide'. But your div does not have any class.
So you should add to your div the class:
<div class="divIWantedToHide" style="width:950px;height:5px;background-color:#FFFFFF;"> </div>
And then, you can show and hide it like here:
$(".divIWantedToHide").hide()
$(".divIWantedToHide").show()
A js plugin is adding a style that is giving me some headache:
element.style {
z-index: 100 !important;
}
So i have tried this:
html body div#shell div#shellContent div#bottomPart div#rightCol div.containerBox
div#embedContainer div#janrainEngageEmbed div.janrainContent div#janrainView
div.janrainHeader[style] {
z-index: 1 !important;
}
and still nothing.
Contrary to the other answers, it is possible to override inline styles with CSS:
http://css-tricks.com/override-inline-styles-with-css/
I would guess that the extremely long selector might not be hitting the element.
I had a similar z-index issue with the Janrain plugin that was solved by this:
#janrainEngageEmbed > div[style] {
z-index: 0;
}
In your case, you probably need:
z-index: 0 !important;
The inline style will trump any selectors. Either reset the style yourself in javascript or patch the plugin... it doesn't sound like a particularly well written anyway, to be honest. : )
inline style always override external and internal css, plus the fact that the plugin is using the !important clause (very bad practice!), all together makes it impossible to get it fixed with css only. I reckon you will have to use some custom js to override the plugin settings.
maybe the best way would be to check if you can specify a callback function with the plugin and set the style as you wanted. another answer here suggested to edit the plugin itself, that is cool if you don't plan to ever update it - otherwise you're better off leaving the plugin code as it is, and just adding some bespoke js of your own
Lately I wondered about editing elements styles not by switching their classes on dom, but by changing the actual ruleset for the css class or selector.
So instead of something like
$('.some').hide()
or
$('.some').addClass('hidden')
Why not alter a rule directly with document.styleSheets and stuff?
Wouldn't this approach be generally more performant, at least with many elements, as we'd let the browser handle the ruleset changes natively?
You could for example add an style to .some, like display: none; and all .some elements would be immedeatly be hidden. There is no need to iterate over all those elements in js and hide them manually(like the example above).
Changing rulesets directly would more likely encourage classes that are context aware(or however you would call this..), as you'd hide all #persons > .item or something.
I still don't know best practices regarding classes that are named with context in mind, like for example control names like .calendar .ticket .item, versus single functionality classes like .hidden .left .green, as I usually need both types of conventions.
I am just asking what you think about this and what are benefits and drawbacks of the modifiying stylesheet approach versus how libraries like jquery handle changing styles?
Also, what do you think is good practice, what do you regard more as a hack?
cough javascript and hacking cough
Manipulating document.styleSheets is tricky due to differing implementations and the lack of a rule selector API. Currently if you want to manipulate a rule in a stylesheet you have to go through this process:
iterate over document.styleSheets
iterate over rules within current styleSheet object
if rule matches our class, edit the rule styles
Then there's the cascading issue. How do you know that a particular style on the rule you've matched won't be overridden by a different rule somewhere in the pages stylesheets? If you just bail out after changing the first matching rule you find, you can't be sure that the styles you set will actually be applied to the element, unless you stick an !important on each one, which will leave you with a whole different set of problems.
Even when you've manipulated the style sheet rules, the browser still has the same job to do — it has to recalculate all the styles by applying the cascade.
So, manipulating styleSheets doesn't look too appealing now, does it? Stick to class switching, trust me. Using jQuery and modern APIs like querySelectorAll make it plenty fast and the browser still does all the hard work like recomputing the style values.
Such a tricky question :(
But if you take boilerplate for instance, it has a some standard classes to use like:
/* Hide from both screenreaders and browsers: h5bp.com/u */
.hidden { display: none !important; visibility: hidden; }
/* Hide only visually, but have it available for screenreaders: h5bp.com/v */
.visuallyhidden { border: 0; clip: rect(0 0 0 0); height: 1px; margin: -1px; overflow: hidden; padding: ; position: absolute; width: 1px; }
/* Hide visually and from screenreaders, but maintain layout */
.invisible { visibility: hidden; }
Where it gets tricky is, IF it is something you need to hide because of JS, then you should ONLY hide it with JS. Then it will function if JS is disabled.
If it is something that is not JS dependent, then you hide it in the HTML.
So JS function = hide with JS (either by using JS or adding hide classes)
Basic HTML hide = hide with HTML class
Styleswitching vs JS switching
Basicly JS switching gives you the oppertunity to add effect etc, just using predefined classes limits that somewhat. But would love to see some ressource comparisons :)
Let's say if I have wrapper div which includes some links and images,
is there any way I can deactivate it at once with CSS only?
After review of answers:
I dropped the idea that can make it with CSS only.
jQuery blockUI plug in works like charm.
There is a CSS rule for that, but it's not widely used because of old browsers support
pointer-events: none;
These days you can just position a pseudo-element over the content.
.blocked
{
position:relative;
}
.blocked:after
{
content: '';
position: absolute;
left:0;
right:0;
top:0;
bottom:0;
z-index:1;
background: transparent;
}
http://jsfiddle.net/HE5wR/27/
I think this one works too:
CSS
pointer-events: none;
if you are going to use jQuery, you can easily accomplish this with the blockUI plugin. ...or to answer your question with CSS, you'll have to absolutely position the div over the content you wish to block. just make sure the absolutely positioned div comes after the content to be blocked for z-indexing purposes.
<div style="position:relative;width: 200px;height: 200px;background-color:green">
<div>
Content to be blocked.
</div>
<div style="position: absolute;top:0;left:0;width: 200px;height:200px;background-color: blue;z-index:2;opacity:0.4;filter: alpha(opacity = 50)"></div>
</div>
sorry for all the inline css. you'll have to make some nice classes. Also, this has only been tested in firefox and IE7.
Cover it up with another un-clickable element. You may need to use JavaScript to toggle this "cover" on and off. You can do something clever like make it semi-transparent or something as well.
<style>
#cover {position:absolute;background-color:#000;opacity:0.4;}
</style>
<div id="clickable-stuff">
...
</div>
<div id="cover">
</div>
<script type="text/javascript">
function coverUp() {
var cover = document.getElementById('cover');
var areaToCover = document.getElementById('clickable-stuff');
cover.style.display = 'block';
cover.style.width = //get areaToCover's width
cover.style.height = //get areaToCover's height
cover.style.left = //get areaToCover's absolute left position
cover.style.top = //get areaToCover's absolute top position
}
/*
Check out jQuery or another library which makes
it quick and easy to get things like absolute position
of an element
*/
</script>
You should consider to apply the event.preventDefault function of jQuery.
Here you can find an example:
http://api.jquery.com/event.preventDefault/
TL;DR-version:
$("#element-to-block").click( function(event) {
event.preventDefault();
}
BAM!
If you mean unclickable so that the users can't copy and paste it or save the data somehow. No this has never really been possible.
You can use the jQuery BlockUI plugin or the CSS rule pointer-events: none; but that doesn't really prevent people from copying your text or images.
At worst I can always wget your content, and at best both css and js methods are easily circumvented using plugins like:
"Allow right click" on firefox or chrome
"Absolute enable right click and copy" on firefox or chrome
"Don't fuck with paste" on firefox or chrome
Further to the point, unless you have a really good and legitimate excuse for breaking basic browser behavior, usability, accessibility, translation functionality, password managers, screenshot tools, container tools, or any number of various browser plugins functionality in the users right click context menu, please, just, stop, doing, this.
I'm having issues getting Firefox to update a webpage when its class is changed dynamically.
I'm using an HTML table element. When the user clicks a cell in the table header, my script toggles the class back and forth between sorted_asc and sorted_des. I have pseudo element which adds an arrow glyph (pointing up or down) depending on which class the cell currently is.
.thead .tr .sorted_asc .cell:after {
content: ' \25B2';
}
The problem is, that when you click the cell header a second time, the page doesn't update the arrow... until the user mouses away from the element. I think it's a bug as it works fine in Safari, and as I don't see any :hover tags in my CSS or other entries that might interfere.
Anyone seen this before, or know how to work around the issue?
It's kind of cheesy, but since you're using javascript anyway, try this after you changed the className:
document.body.style.display = 'none';
document.body.style.display = 'block';
This will re-render the layout and often solves these kind of bugs. Not always, though.
This is 2014 and none of the proposed solutions on this page seem to work. I found another way : detach the element from the DOM and append it back where it was.
Would you be able to use different CSS to accomplish the same thing without relying on the :after pseudo-selector? You might be able to simple define a background-image which you align as needed (I assume you would want the arrow on the right hand side).
For example:
.thead .tr .sorted_asc .sorted_asc {
background: url(images/down_arrow.png) no-repeat right;
}
.thead .tr .sorted_asc .sorted_des {
background: url(images/up_arrow.png) no-repeat right;
}
I only suggest this since I assume there isn't a specific reason why you need to use the :after pseudo-class. If you do need to use it, please update.
The bug can still be triggered in Firefox 58. Thankfully the opacity trick also still works. Just make sure to time it correctly. You might need to set a timeout between opacity changes.