Toggle innerHTML - javascript

I've seen various examples come close to what I am looking for, but none of it seems to describe it how I exactly want it. I am a beginner to jQuery, so explanations welcome.
I'm looking for this to toggle the innerHTML from - to +. Anyone know of a way to do this, efficiently?
jQuery/JavaScript
$(document).ready(function() {
$(".A1").click(function() {
$(".P1").toggle("slow");
$(".A1").html("+");
});
});
HTML
<div class="A1">-</div>
<h2 class="H1">Stuff</h2>
<div class="P1">
Stuffy, Stuffy, Stuffed, Stuffen', Stuffing, Good Luck Stuff
</div>
Thank you, anything relating to switching the inside text of an HTML element shall help. =)

How about adding a class that will let you know the expanded/collapsed status?
$(document).ready(function() {
$(".A1").click(function() {
var $this = $(this);
$(".P1").toggle("slow")
$this.toggleClass("expanded");
if ($this.hasClass("expanded")) {
$this.html("-");
} else {
$this.html("+");
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="A1 expanded">-</div>
<h2 class="H1">Stuff</h2>
<div class="P1">
Stuffy, Stuffy, Stuffed, Stuffen', Stuffing, Good Luck Stuff
</div>
Example: http://jsfiddle.net/sGxx4/

$(document).ready(function() {
$(".A1").click(function() {
$(".P1").toggle("slow");
$(".A1").html(($(".A1").html() === "+" ? $(".A1").html("-") : $(".A1").html("+")));
});
});
A bit of explanation: I'm setting $("#A1").html() with the product of the tertiary operator, using it to check for the current value of #A1's text. If it's a +, I set the element's text to -, otherwise, I set it to +.
However, you said "efficiently." To this end, it's important to note that if you're going to use a selector twice or more in the same function, you should store the jQuery object that results from the selector you give in a variable, so you don't have to re-run the selector each time. Here's the code with that modification:
$(document).ready(function() {
$(".A1").click(function() {
var $A1 = $(".A1");
$(".P1").toggle("slow");
$A1.html(($A1.html() === "+" ? $A1.html("-") : $A1.html("+")));
});
});

There's no way to toggle content.
You could check if the $('.P1') is visible, then changing the +/- div according to that.
Something like :
$(document).ready(function() {
$(".A1").click(function() {
$(".P1").toggle("slow", function(){
if($(this).is(':visible'))
$(".A1").html("-")
else
$(".A1").html("+")
});
});
});
Using a callback function (the second argument of the .toggle() method) to do the check will guarantee that you're checking after the animation is complete.
JsFiddle : http://jsfiddle.net/cy8uX/

more shorter version
$(document).ready(function() {
$(".A1").click(function() {
var $self = $(this);
$(".P1").toggle("slow", function ( ) {
$self.html( $self.html() == "-" ? "+" : "-");
});
})
});

Here's a way that uses class names on a parent and CSS rules and doesn't have to change the HTML content and works off a container and classes so you could have multiple ones of these in the same page with only this one piece of code:
HTML:
<div class="container expanded">
<div class="A1">
<span class="minus">-</span>
<span class="plus">+</span>
</div>
<h2 class="H1">Stuff</h2>
<div class="P1">
Stuffy, Stuffy, Stuffed, Stuffen', Stuffing, Good Luck Stuff
</div>
</div>​
CSS:
.expanded .plus {display:none;}
.collapsed .minus {display: none;}
Javascript:
$(document).ready(function() {
$(".A1").click(function() {
$(this).closest(".container")
.toggleClass("expanded collapsed")
.find(".P1").slideToggle("slow");
});
});
​
Working demo: http://jsfiddle.net/jfriend00/MSV4U/

Related

selection/active class for show/hide divs

So I have this thing where I need one div to be shown at any one time depending on the button clicked. I found this great fiddle which is almost perfect except for the fact that it doesn't show when one link is selected. I'd like to have it so that the link that's selected can have a sort of active class or look different from the other links. Is that possible? I've been looking through questions and I can't really find an answer for this.
If anyone's interested, I'm using it for this (but the code is really messed up, sorry). (I'd also like to change the filter buttons on the top row to reset and filter all the images, but am aware that's a different question. Still any help would be appreciated!)
html
<div id="linkwrapper">
<a id="link1" href="#">link1</a><br/>
<a id="link2" href="#">link2</a><br/>
<a id="link3" href="#">link3</a>
</div>
<div id="infocontent">
<div id="link1content">Information about 1.</div>
<div id="link2content">Information about 2.</div>
<div id="link3content">Information about 3.</div>
</div>
jquery
$(document).ready(function(){
$("#infocontent").hide();
$("#infocontent div").hide();
$('#linkwrapper a[id]').click(function(){
var vsubmen = this.id +"content";
if( $("#infocontent").is(":visible") == false ) {
$("#" + vsubmen).show('fast',function() {
$("#infocontent").slideDown();
});
} else if ( $("#" + vsubmen).is(":visible") == false ) {
$("#infocontent").slideUp('slow',function(){
$("#infocontent div").hide();
$("#" + vsubmen).show();
$("#infocontent").slideDown('slow');
});
} else {
$("#infocontent").slideUp('slow',function(){
$("#infocontent div").hide();
});
}
return false;
});
});
You can simplify that fiddle like this:
$('a[id^=link]').click(function(){
$('a[id^=link]').removeClass('meactive');
$(this).addClass('meactive');
$('#infocontent>div').slideUp();
var tmp = this.id;
$('#'+tmp+'content').slideDown();
}); //end a.click
jsFiddle Demo
Notes:
(1) $('a[id^=link]') -- grabs all a elements with a ID that starts with link
(2) $('#' +tmp+ 'content') -- builds selectors like: $('#link3content)`

Toggling between two buttons using jQuery

I've seen a few articles about this dotted around but I cant seem to get their solutions to work for me.
What I have are two buttons which control the show() and hide() states of different div's. On page load both of the div's are set to .hide() as the user doesn't need to see them until clicked.
So, I have two buttons a and b which currently work perfectly however you can show() both div's at the same time which I don't want to happen. The current code resembles
$('#a-div).hide();
$('#b-div).hide();
$('#a').click(function(){
$('#a-div).toggle(500);
});
$('#b').click(function(){
$('#b-div).toggle(500);
});
So how can I re-write this so that if #a-div is visible (already tried the .is(':visible') method) and #b is clicked nothing happens until #a-div is hidden again and vis versa?
Try this
$('#a-div').hide();
$('#b-div').hide();
$('#a').click(function(){
$('#a-div').toggle(500);
if($('#b-div').is(":visible"))
$('#b-div').hide();
});
$('#b').click(function(){
$('#b-div').toggle(500);
if($('#a-div').is(":visible"))
$('#a-div').hide();
});
probably you need to apply concept like this
$('#a-div).hide();
$('#b-div).hide();
$('#a').click(function(){
if ($('#b').isVisible)[you can check via css property as well]
{
$('#b-div).toggle(500); [or set css property visiblity:hidden]
$('#a-div).toggle(500);
}
else {$('#a-div).toggle(500);}
});
$('#b').click(function(){
if ($('#a').isVisible)[you can check via css property as well]
{
$('#a-div).toggle(500); [or set css property visiblity:hidden]
$('#b-div).toggle(500);
}
else {$('#b-div).toggle(500);}
});
What I ended up doing is this
$('#a-div').hide();
$('#b-div').hide();
$('#a').click(function(){
$('#a-div').toggle();
$('#b-div').hide();
});
$('#b').click(function(){
$('#b-div').toggle();
$('#a-div').hide();
});
For anyone who is interested. Prior to this I was making this much more complex than it needed to be.
Another solution is to create a universal function and pass the parameters of the shown and hidden objects. This way you can use the same method for future elements:
function toggleDivs($show, $hide) {
$show.toggle();
$hide.hide();
}
$("#b").on("click", function() { toggleDivs($("#b-div"), $("#a-div")); });
$("#a").on("click", function() { toggleDivs($("#a-div"), $("#b-div")); });
The only item missing is to initially hide the div objects, but I would add a css class to the objects to hide them.
HTML
<button id="a">Show A</button>
<button id="b">Show B</button>
<div id="a-div" class="hideDiv">A</div>
<div id="b-div" class="hideDiv">B</div>
CSS
.hideDiv { display:none; }
var $aDiv = $('#a-div');
var $bDiv = $('#b-div');
var $aBtn = $('#a');
var $bBtn = $('#b');
$aDiv.hide();
$bDiv.hide();
$aBtn.click(function(){
$aDiv.toggle(500, function(){
if($aDiv.is(":visible"))
$bBtn.prop("disabled",true);
else
$bBtn.prop("disabled",false);
});
});
$bBtn.click(function(){
$bDiv.toggle(500, function(){
if($bDiv.is(":visible"))
$aBtn.prop("disabled",true);
else
$aBtn.prop("disabled",false);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="a-div">div a</div>
<div id="b-div">div b</div>
<button id="a">btn a</button>
<button id="b">btn b</button>

Hiding an unordered list when it has no elements

I have a problem that seems at first like a total no-brainer and an easy task.
I have a JavaScript plugin on my page that generates a Table Of Contents list to the sidebar of my Wordpress pages. My purpose is to hide the text widget element of the #toc when the list within it has no elements. I'm trying to solve it using jQuery but no luck.
The HTML:
<div class="textwidget">
<div id="toc">
<ul></ul>
</div>
</div>
The JavaScript:
jQuery(document).ready(function ($) {
if (!$('#toc').children('ul').has('li')) {
$('#toc').parent().hide();
}
});
My script should hide this specific #toc's parent, because it has no child <li> elements, but it doesn't. Instead, when I remove the ! from my if sentence, the script hides my list, as if it had something in it. It then also hides the lists that actually have elements in them. Am I totally missing something here?
Simply use this:
$(document).ready(function () {
if ($('#toc ul li').length < 1) {
$('#toc').parent().hide();
}
});
<script>
$(document).ready(function(){
$("#YourListID").hide();
var a = $("#YourListID li").length();
if (a > 0 ) {
$("#YourListID").show();
}
else {
$("#YourListID").hide();
}
});
</script>
You can try one of the following:
1) Give the UL an ID and check it's HTML. Ex:
var ulHtml = $("#myULElement").html();
if(ulHtml == ''){
$('#toc').parent.hide();
}
2) Do the same as above but with a relative path, like:
var ulHtml = $("#toc ul").html();
//etc...
See if that works. If it does, we can elaborate on it further.
This works:
if(!$('#toc').has('ul li').length) {
$('#toc').closest('.textwidget').hide();
}
Working jsfiddle here
What you need to do is add .length to your testing statement.
jQuery(document).ready(function ($) {
if (!$('#toc').children('ul').has('li').length) {
$('#toc').parent().hide();
}
});
Working Fiddle
Source: http://api.jquery.com/has/
Use length to evaluate if there are <li> or not.
DEMO
<div class="textwidget">
<div id="toc">
<ul></ul>
</div>
</div>
if ($('#toc ul li').length<1) {
$('#toc').parent().hide();
}
inside $(document).ready check for this
if($.trim($('#toc ul').html()).length == 0){
$('#toc').parent().hide();
}
as case may arise
<ul></ul>
<ul>
</ul>

Better (more performant) way to get specific DIVs?

I want to add a specific DIV to other DIVs of a defined class. Because the page changes regularly I do this on every DOM-Change. This happens quite often and there are a lot of DIVs (up to a few 1000) that meet the criteria.
(This is an extension so I cannot modifiy the source)
I do it this way:
$('.Qg').each(function() {
if ($(this).parent().find('.quickShare').length === 0)
{
$(this).before('<div class="quickShare">(some more html)<br/></div>');
}
});
That works but does not seem to be very performant, mainly because of the "each" - Loop
Is there a more elegant (and especially performant) way to get only those DIVs which's parent do not contain my DIV (something like $('.Qg').parent().without('quickShare').each(function(){}); (pseudocode)?
Update: To make it clearer a DOM-Example:
<div class="anOuterDiv>
<div class="Qg">something here</div>
</div>
<div class="anotherOuterDiv">
<div class="quickShare">already added</div>
<div class="Qg">something here</div>
</div>
I want to Add the "quickShare" div before the "Qg", but only if it does not exist. (So I want to get the upper Qg, but not the lower Qg)
Give all the parents of .Qg the class QgContainer, then do:
$(".QgContainer:not(:has(.quickShare)) > .Qg").each(function() {
...
});
Since you can't change the site, try:
$(".Qg").filter(function() {
return $(this).siblings(".quickShare").length == 0);
}).each(function() {
...
});
As you wanted better(more perfomant) then you could consider using pure Javascript.
HTML
<div class="anOuterDiv1">
<div class="Qg">something here</div>
</div>
<div class="anOuterDiv2">
<div class="quickShare">already added</div>
<div class="Qg">something here</div>
</div>
<div class="anOuterDiv3">
<div class="Qg">something here</div>
</div>
<div class="anOuterDiv4">
<div class="quickShare">already added</div>
<div class="Qg">something here</div>
</div>
Javascript
Array.prototype.forEach.call(document.getElementsByClassName('Qg'), function (Qg) {
var parentNode = Qg.parentNode,
quickShares = parentNode.getElementsByClassName('quickShare'),
newQuickShare;
if(!quickShares.length) {
newQuickShare = document.createElement('div');
newQuickShare.className = 'quickShare';
newQuickShare.textContent = 'Newly added';
parentNode.insertBefore(newQuickShare, Qg);
}
});
On jsFiddle
Next we should actually compare it against some jQuery, so we will use the accepted answer.
$(".Qg").filter(function() {
return $(this).siblings(".quickShare").length == 0;
}).each(function() {
$(this).before('<div class="quickShare">Newly added</div>');
});
On jsFiddle
And now lets see how they perform on jsPerf
You can filter each .Qg that's not preceded by a .quickShare sibling and then apply .before() on that:
$('.Qg')
.filter(function() {
var node = this.previousSibling; // start with previous sibling
while (node) {
if (node.className == 'quickShare') {
return false; // we found one
}
node = node.previousSibling; // keep trying with previous sibling
}
return true;
})
.before('<div class="quickShare">(some more html)<br/></div>');
This time it will definitely work:
$('div:only-child.Qg').each(function(){
$(this).before('<div class="quickShare">(some more html)<br/></div>');
});
Try this. This is very easy and readable and small and performant.
jsFiddle Demo http://jsfiddle.net/VS6mG/

How to use jQuery to get elements with the same z-index?

Right now, I have elements with different z-index, and I want to group them using jQuery.
<div class="float" style="z-index:2"></div>
<div class="float" style="z-index:6"></div>
<div class="float" style="z-index:10"></div>
.
.
.
<!-- You get the point -->
I can use .attr("style") to get the z-index value out, but it does not seem to be a good idea to do that. (and sometimes it might in the <style> tag too) Is there anything like that?
var ele = $("*[zindex=5]");
Looking forward for any solutions.
Create your own custom selector:
$.extend($.expr[':'], {
zindex: function(el, i, m) {
return $(el).css("z-index") === m[3];
}
});
Which you could then use like this:
$("div:zindex(2)").each(function(){
alert( this.innerHTML );
});
This will return all div elements with a z-index of 2.
<div style="position:relative; z-index:2">Foo</div>
<div style="position:relative; z-index:6">Bar</div>
With the above markup, the earlier jQuery script will alert Foo.
Demo: http://jsbin.com/icevih/2/edit
If you add this function, then you will have them
$.fn.filterByZIndex = function(zIndex) {
var $zElm = $("*").filter(function() {
return $(this).css('z-index') == zIndex;
});
return $zElm;
};

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