I was hoping someone could help me out with this simple question: I’ve just started to learn jQuery and found a code to show hidden text after selecting an item.
I’d like to update it so that:
a.) The selected item is bold
b.) I can add placeholder text instead of starting off with a blank hidden text field
I foolishly assumed I could solve a.) by using the :active property in css, but that only works as long as the link is clicked on. (As soon as you release the mouse button it’s gone.) Just like b.), this is probably only possible by using jQuery as well? If so, would be really great if you could show me how to solve it. :)
The codes: http://jsfiddle.net/KUtY5/1/
JS
$(document).ready(function(){
$("#nav a").click(function(){
var id = $(this).attr('id');
id = id.split('_');
$("#menu_container div").hide();
$("#menu_container #menu_"+id[1]).show();
});
});
CSS
#menu_container {
width: 650px;
height: auto;
padding-left: 30px;
}
#menu_container div {
display:none;
}
HTML
<div id='nav'>
<a id="show_apps">Appetizers</a> | <a id="show_soups">Soups and Salads</a> | <a id="show_entrees">Entrees</a>
</div>
<div id="menu_container">
<div id="menu_apps">
Content of the App Section Here
</div>
<div id="menu_soups">
Content of the Soups Section Here
</div>
<div id="menu_entrees">
Content of the Entrees Section Here
</div>
</div>
Updated fiddle
You can realize a) using a custom class bold for example and the following code :
CSS
.bold{ font-weight: bold;}
JS
$(this).addClass('bold').siblings('a').removeClass('bold');
For b) I can't find any textfield in your code.
Hope this helps.
I have added some extra lines to your code and you can check it from here http://jsfiddle.net/KUtY5/483/.
You bold like this
$("#nav a").css("font-weight", 400); // First you make them thin
$(this).css("font-weight", 800); // Than you make them bold
You put placeholder like this
<div id="placeholder">
Placeholder
</div>
$("#placeholder").hide();
On the other hand I recommend you not to hide menu container. Rather hide the elements inside the menu_container. So you can put a plcaeholder in menu container and you can hide it.
To figure this out 2 questions must be asked / solved
how do you normally make text bold on a page... css right?
where do you want those styles to be defined? There are 2 places:
a. You can define it inside the javascript.
b. You can define it inside the projects css through normal methods (inline, external, embedded).
What's the difference? If you define it inside the javascript the code is self-contained. What i mean by that is you can copy/paste the JS code from one project to the next and you don't need to worry about copying related styles from the stylesheets or other sources because it's all in the JQuery that you've written.
In contrast if you define it outside the javascript in the regular places the code may not be self-contained however some find it easier to manage in the scope of that particular project because all your css is contained in one place (external stylesheet typically).
If you want to take option a, see the .css() method
If you want to take option b, see the style manipulation (toggle class in particular)
Note the examples in the above references should get you 90% of the way to understanding it.
Some final words. Learn Jquery, but i advise you to stay away from it as much as possible because it implements DOM thrashing instead of DOM caching (sizzle engine).
This video series will briefly go into why Jquery sucks for performance in the first video and the rest of the series is about how to create modular vanilla JS.
JQuery goes back and searches the DOM every time you need to make a change that is what
$.(*element*) is doing instead of just caching it.
The more nodes you have in the DOM the more processing power is used searching (because it has to go through the entire tree).
Then on top of that the more elements you have to make changes to (say if you use a css class selector) you have to add even more processing on top of that.
All this is fine if you're on a desktop, but what about a mobile platform? Where would you get all this processing power from?... It doesn't exist.
Related
I have a large Joomla CMS Website I'm working on.
Problem: I need to hide a menu tab globally across the entire site. The menu item I need to have does not have a unique ID or class; but instead shares the same class as the other tabs I need to keep on the page. 70% of the tab I need to remove shows in 4th order so I started with the below.
.tabs:nth-of-type(4)
{
display:none !important;
}
But! Seeing as how the rest is in different order, this wont work. The tab in question I need to remove looks like the below across the mark-up.
Update: This is what I currently have via the suggestions below but it isn't working:
$(document).ready(function() {
$('.djaccTitle:contains("Location").css( "display: none;" )')
});
<span class="tabs">Location</span>
Is there a way to write an if statement or similar lightweight solution that can sniff out text content within the class, so if it says Location, then hide?
I would like to find a solution like this, as opposed to going through 1000 files of mark-up removing manually. Cheers for any pointers
Update: This is what I have via the current suggestions below but it isn't working!
$(document).ready(function() {
$('.tabs:contains("Location").css( "display: none;" )')
});
I do not believe what you are asking for exists with pure CSS at this time.
What I would do is use jQuery's :contains() selector:
$('span.tabs:contains("Location")')
or even better:
$('#idOfTabsContainer span.tabs:contains("Location")')
And of course, don't forget to put this in a document.ready to ensure that your DOM element has been loaded successfully:
$(document).ready(function() {
$('#idOfTabsContainer span.tabs:contains("Location")')
});
Jquery :contains() Selector should work. I think you have an error in .css() function syntax.
Please try with:
jQuery(document).ready(function(){
$( '.tabs:contains("Location")' ).css( 'display', 'none' );
});
Hope this helps
There used to be a :contains selector that they were going to add to CSS.
But alas, you may have to resort to some JS, as addressed already here
jQuery's got your back though:
$('.tabs:contains("Location")')
Problem: I need to hide a menu tab globally across the entire site.
Solution 1: Disable the menu item. Boom, it is gone from your menus, site wide.
Solution 2: Hide the menu item with css by adding a unique class to the menu item itself and then hiding it with css.
.hide-me-with-css {display: none;}
I am trying to enhance the menu of my website a bit by making use of the jQuery accordion plugin:
http://jqueryui.com/accordion/
This works perfectly fine and i think that it is a great plugin to make use of... However, i have noticed that it requires a specific layout in order to achieve these results:
<div id="accordion">
<h3>Section 1</h3>
<div>
<p>
ETC...
</p>
</div>
NB: repeated for every result
</div>
Now this is a bit of a problem in that when javascript is disabled, the entire output of this menu is displayed (all categories and containing information).
This is simply too much information to be output all at once and this is the reason that it has been broken up with PHP in the first place. In essence it would look like this:
// No category selected
* Fruits
* Vegetables
// Category selected
o Fruits
- Apples
- Oranges
* Vegetables
// Javascript Disabled
o Fruits
- Apples
- Oranges
* Vegetables
- Potatoes
- Onions
So what i would like to do, is provide an alternate means of navigation for users that have disabled javascript (the old menu that is fully functional and works regardless).
I currently make use of a few options in modernizer:
http://modernizr.com/
To increase browser support on some CSS properties i have used. I am aware that it can be used to detect if javascript is enabled by appending a class "js" to the body tag.
So with that, i decided to try and wrap the old menu within a containing div, and the new menu within a containing div. My idea is that i can then these divs with display: none;.
Before i carry on, i am really just guessing here so if i am going about this the wrong way... I would appreciate it if someone could point me in the right direction. With that out of the way, i found an article on stackoverflow that relates to this:
PHP & <noscript> combination to detect enabled JavaScript in browser
And with my very limited knowledge of jQuery have adapted it slightly to fit what i hope to achieve:
<script type="text/javascript">
$(document).ready(function(){ // Use jQuery!
// Remove the no-js and add the js (because JS is enabled (were using it!!)
$("body").removeClass("no-js").addClass("js");
})
// Put it in a var so you dont traverse the DOM unnecessarily.
var useJS = $("body").hasClass("js");
if(useJS){ // true or false if <body> has class JS.
// JS Enabled
$("#oldMenu").css("display", "none");
$("#newMenu").css("display", "inline");
} else {
// JS NOT enabled
$("#newMenu").css("display", "none");
$("#oldMenu").css("display", "inline");
}
</script>
Now the problem I am facing is that i cannot seem to get this script to register or make any visible difference. When i look at the body tag in the source there is no class on the body tag. The menu is not triggering as i thought it would and i am now after quite some time... Very confused.
If anyone could offer me some assistance, advice, information or indication that would help me to solve this current issue, i would really, REALLY appreciate that!
Thank you for taking the time to read through my line story! :)
EDIT:
#RomainPaulus suggested this and it works:
<script type="text/javascript">
$(document).ready(function(){ // Use jQuery!
// Remove the no-js and add the js (because JS is enabled (were using it!!)
$("body").removeClass("no-js").addClass("js");
// Put it in a var so you dont traverse the DOM unnecessarily.
var useJS = $("body").hasClass("js");
if(useJS){ // true or false if <body> has class JS.
// JS Enabled
$("#oldMenu").css("display", "none");
$("#newMenu").css("display", "inline");
} else {
// JS NOT enabled
$("#newMenu").css("display", "none");
$("#oldMenu").css("display", "inline");
}
})
</script>
Kenneth's response explains a lot, but I have noticed something else. Your code
var useJS = $("body").hasClass("js");
is executed before
$(document).ready(function(){ // Use jQuery!
// Remove the no-js and add the js (because JS is enabled (were using it!!)
$("body").removeClass("no-js").addClass("js");
})
You should put everything inside the $(document).ready(function(){ ... })
So I guess that explains why your code doesn't work.
The problem you face here is that, obviously when Javascript is not enabled, you're Javascript is not executing.
What you need to is hide the DIV by default with CSS. Then, when your page loads, show it through JS.
Javascript disabled => Div stays hidden, because no code is executed
Javascript enabled => div is hidden on load, but the script shows it
Also, if Javascript is disabled, Modernizr won't help, since it's a JavaScript library.
The code below works fine with ONE Reveal/Hide Text process
<div class="reveal">Click Here to READ MORE...</div>
<div style="display:none;">
<div class="collapse" style="display:none;">Collapse Text</div>
However if this code is duplicated multiple times, the Collapse Text shows up and doesn't disappear and in fact conflicts with the Expand to reveal even more text instead of collapsing as it should.
In this http://jsfiddle.net/syEM3/4/ click on any of the Click Here to READ MORE...
Notice how the Collapse Text shows up at the bottom of the paragraphs and doesn't disappear. Click on the Collapse and it reveal more text.
How do I prevent this and getting to work as it should?
The two slideDown function calls are not specific to the .reveal and/or .collapse that you are currently doing. i.e.
$(".collapse").slideDown(100);
will find all the elements with the class .collapse on the page, and slide them down. irrespective of what element you just clicked.
I would change the slideDown call to be relavant to the element you just clicked i.e. something like this
$('.reveal').click(function() {
$(this).slideUp(100);
$(this).next().slideToggle();
$(this).next().next(".collapse").slideToggle(100);
});
in your code
$('.reveal').click(function() {
$(this).slideUp(100);
$(this).next().slideToggle();
$(".collapse").slideDown(100);
});
$('.collapse').click(function() {
$(this).slideUp(100);
$(this).prev().slideToggle();
$(".reveal").slideDown(100);
});
this two rows doesn’t do what you want as they act on all elements of the specified class
$(".reveal").slideDown(100);
$(".collapse").slideDown(100);
When you do $(".collapse").slideDown(100);, jQuery runs slideDown on everything with the .collapse class, not just the one that's related to your current this. To fix this, refer to the collapse based on its location to $(this).
Do do this, use something like $(this).siblings(".collapse").slideDown(100);
Note that this particular selector will only work if you enclose each text block in its own div. With each text element in its own div, like you have it now, .siblings(".collapse"), which selects all the siblings of $(this) with the collapse class, will still select both of the collapse elements.
Okay, I think you should take a different approach to your problem.
See, jQuery basically has two purposes:
Selecting one or more DOM elements from your HTML page
manipulate the selected elements in some way
This can be repeated multiple times, since jQuery functions are chainable (this means you can call function after function after function...).
If I understood your problem correctly, you are trying to build a list of blog posts and only display teasers of them.
After the user clicks the "read more" button, the complete article gets expanded.
Keep in mind: jQuery selects your elements very much like CSS would do. This makes it extremely easy to
come up with a query for certain elements, but you need to structure your HTML in a good way, like
you would do for formatting reasons.
So I suggest you should use this basic markup for each of your articles (heads up, HTML5 at work!):
<article class="article">
<section class="teaser">
Hey, I am a incredible teaser text! I just introduce you to the article.
</section>
<section class="full">
I am the articles body text. You should not see me initially.
</section>
</article>
You can replace the article and section elements with div elements if you like to.
And here is the CSS for this markup:
/* In case you want to display multiple articles underneath, separate them a bit */
.article{
margin-bottom: 50px;
}
/* we want the teaser to stand out a bit, so we format it bold */
.teaser{
font-weight: bold;
}
/* The article body should be a bit separated from the teaser */
.full{
padding-top: 10px;
}
/* This class is used to hide elements */
.hidden{
display: none;
}
The way we created the markup and CSS allows us to put multiple articles underneath.
Okay, you may have noticed: I completely omitted any "read more" or "collapse" buttons. This is done by intention.
If somebody visits the blog site with javascript disabled (maybe a search engine, or a old mobile which doesn't support JS or whatever),
the logic would be broken. Also, many text-snippets like "read more" and "collapse" are not relevant if they don't actually do anything and are not part of the article.
Initially, no article body is hidden, since we didn't apply the hidden css class anywhere. If we would
have embedded it in the HTML and someone really has no JavaScript, he would be unable to read anything.
Adding some jQuery magic
At the bottom of the page, we are embedding the jQuery library from the google CDN.
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
This is a best practice and will normally speed up your page loading time. Since MANY websites are embedding
jQuery through this URL, chances are high that its already in the visitors browser cache and doesn't have
to be downloaded another time.
Notice that the http: at the beginning of the URL is omitted. This causes browsers to use the pages current protocol,
may it be http or https. If you would try and embed the jQuery lib via http protocol on a https website, some browsers will refuse to download the file from a unsecure connection.
After you included jQuery into the page, we are going to add our logic into a script tag. Normally we would
save the logic into a separate file (again caching and what not all), but this time a script block will do fine.
Finally some JavaScript
At first, we want to hide all elements with the css-class full, since only teasers should remain displayed. This is very easy with jQuery:
$('.full').hide();
The beginning of the script $('.full') tells jQuery: I need all elements with the CSS-class full. Then we call a function on that result, namingly hide() which purpose should be clear.
Okay, in the next step, we want to add some "read more" buttons, next to every teaser. Thats an easy task, too:
$('.teaser').after('<button class="more">Read more</button>');
We now select every element with the css-class teaser and append some HTML code after() each element - a button with the css-class more.
In the next step, we tell jQuery to observe clicks on every one of this freshly created buttons. When a user has clicked, we want to expand the next element with the css-class full after the clicked button.
$('.more').on('click', function(){
//"this" is a reference to the button element!
$(this).slideUp().next('.full').slideDown();
});
Phew, what did we do here?
First, we told jQuery that we wanted to manipulate this, which is a reference to the clicked button. Then we told
jQuery to hide that button (since its not needed anymore) slowly with slideUp().
We immediately continued telling jQuery what to do: Now take the next() element (with the css-class full) and make it visible by sliding it down with slideDown().
Thats the power of jQuerys chaining!
Hiding again
But wait, you wanted to be able to collapse the articles again! So we need a "collapse" button, too and
some more JavaScript:
$('.full').append('<button class="collapse">Collapse text</button>');
Note: we didn't use the after() function to add this button, but the append() function to place the button
INSIDE every element with the css-class full, rather than next to it. This is because we want the
collapse buttons to be hidden with the full texts, too.
Now we need to have some action when the user clicks one of those buttons, too:
$('.collapse').on('click', function(){
$(this).parent().slideUp().prev('.more').slideDown();
});
Now, this was easy: We start with the button element, move the focus to its parent() (which is the element that contains the full text) and tell jQuery to hide that element by sliding it up with slideUp().
Then we move the focus from the full-text container to its previous element with the css-class more, which is its expanding button that has been hidden when expanding the text. We slowly show that button again by calling slideDown().
Thats it :)
I've uploaded my example on jsBin.
I am trying to build a progressively enhanced page that works for JS and non-JS users. I would like to hide some form controls initially for JS users, but always show them for non-JS users.
My question is about how to do this without creating a distracting "visible, then instantly hidden" flash of content for JS users.
For example, in the JS version, I want to collapse part of my search form, and instead show a 'click here for extra options' button. I do this as follows:
$(document).ready(function() {
$("#extra-options").hide();
...
$("#show-extra-options").click(function() {
$("#extra-options").slideToggle();
});
});
This works, but it means that for JS users, when the page loads, the extra options are visible for 500ms or so, then they vanish. It's rather distracting.
Is there any sensible way to get around this?
StackOverflow has just suggested this answer: is this sensible? Sorry if this is now a duplicate question, but I figure it's still worth writing this question in my own language, as I didn't find the answer during searching.
Add this in your script tag in the head:
$('html').addClass('js');
Then you can use that to show and hide elements:
.hasJs { display: none; }
.js .hasJs { display: block; }
.js .noJs { display: none; }
You can hide content for either users with or without Javascript:
<div class="hasJs">Some content only visible for JS users.</div>
<div class="noJs">Some content only visible for non-JS users.</div>
As the class and CSS are in the head, the elements will already be styled when they come into existance when the body is parsed.
Demo: http://jsfiddle.net/Guffa/YuAyr/
This is a similar approach to the one in the first answer to the question that you linked to, but this is somewhat cleaner because you don't have to add a class to the html element in the markup, and the code simply adds the class instead of removing it.
I have created http://techavid.com/design/test3.html and when you load the page you see there are 3 images. The sun image is focused(in color), while the others are greyed out until clicked. That is how it should be for the images.
Under each image you see a sentence 1st: Sun, 2nd: Airplane & 3rd: Nano, but when page loads you see all three sentences. How to make it so when page loads the first sentence underneath the active image (sun) shows only and the others do not show, they only show when clicked (though that works just need to figure out onpage load only show "1st: Sun")?
thanks :)
paul J.
If you'd put the first two links in a span (like you do with the other two sets of links), this should work:
$('#popuptext span:not(:first) a').hide();
The proposed HTML would look something like this:
<div id="popuptext">
<span class="suntext"> <!-- add this -->
1st:
Sun
</span> <!-- and this -->
<span class="planetext">
2nd:
Airplane
</span>
<span class="nanotext">
3rd:
Nano
</span>
</div>
http://api.jquery.com/first-selector/
http://api.jquery.com/not-selector/
Edit
Sorry, I haven't looked at your code close enough. You have to change the selector from #popuptext span:not(:first) to #popuptext span:not(:first) a, then it works correctly. Also note my comment below.
The simple way is to wrap the sentence in an element of its own (e.g. ) and toggle visibility of it using CSS. (and a bit of JavaScript).
For instance assuming that the images are in a li element with class names imageBox:
li.imageBox span.imageCaption {
/* set style options */
}
li.imageBox.active span.imageCaption {
/* use different style options */
}
$(document).ready(function(){
$(".planetext").hide();
$(".nanotext").hide();
}
Is that what you're asking?
Your javaScript code hide elements on the page by setting their style to display: none.
I guess the simplest way to hide some elements by default is to explicitly set this style on them by editing the HTML or a CSS file.
You may also want to try visibility: hidden which doesn't affect the document flow.