Count Number of Matched Elements in Document with jQuery - javascript

I need to count the amount of video thumbnails on a given product page for an ecommerce store, and then output this number on the same page in a particular HTML element.
The desired result is that on the 'Videos' tab there will be the number of videos right next to it. i.e. Videos 17
I've tried to use .length() and .append() to achieve this but am having dramas. I have about 1.5 days jQuery experience so I know I'm doing something wrong here.
$document().ready(function(){
var numvids = $('.videos').length;
$('.countvids').append("<p>"+numvids+"</p>");
});
I've set up a JSFiddle
Any help is much appreciated. Thanks!

In Jquery $() is a selector, if you say :
$(document).ready(function(){
});
it means that execute the block inside that function when my document is loaded complete on the browser, but what you write :
$document().ready(function(){
...
});
is wrong syntax and is not valid in jquery.
this should work with length:
$(document).ready(function(){
var numvids = $('.videos').length;
$('.countvids').append("<p>"+numvids+"</p>");
});
or you can use size():
$(document).ready(function(){
var numvids = $('.videos').size();
$('.countvids').append("<p>"+numvids+"</p>");
});
here is Fiddle DEMO
you code was like this:
$document().ready(function(){
var numvids = $('.videos').length;
$('.countvids').append("<p>"+numvids+"</p>");
});
which is wrong
and also you need to include query script file in your page.
you can include it from online like this:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js" ></script>

See updated fiddle.
The only error is that you did not include the Jquery link and/or
$(document).ready(function(){
http://jsfiddle.net/65BrR/4/

$document() is not Correct syntax of jquery , its $(document)
hope so its solve your problem !
$(document).ready(function(){
var numvids = $('.videos').length;
alert(numvids );
$('.countvids').append("<p>"+numvids+"</p>");
});

Your mistake was referencing the a non-existent global function called $document isntead of calling $(document). As it happens, your code would have worked, as-is, if it had been preceded by this:
var $document = $(document).ready;
But this is purely for amusement and is not very practical or readable code :)
Use the document-ready shortcut syntax
You really want to use the shorter jQuery shortcut. Instead of $(document).ready(function() {YOUR CODE HERE}); use $(function(){YOUR CODE HERE});
e.g.
$(function(){
var numvids = $('.videos').length;
alert(numvids );
$('.countvids').append("<p>"+numvids+"</p>");
});
This results in shorter code and is becoming so commonplace you might as well get used to it :)

Related

jQuery Conflict, dropdown functionality of the sidebar doesn't work [duplicate]

I have a simple jQuery script in a WordPress plugin that is using a jQuery wrapper like this:
$(document).ready(function(){
// jQuery code is in here
});
I am calling this script from within the WordPress Dashboard and am loading it AFTER the jQuery framework has loaded.
When I check the page in Firebug I constantly keep receiving the error message:
TypeError: $ is not a function
$(document).ready(function(){
Should I maybe wrap the script in this function:
(function($){
// jQuery code is in here
})(jQuery);
I have had this error quite a few times and am not sure how to handle it.
Any help would be greatly appreciated.
By default when you enqueue jQuery in Wordpress you must use jQuery, and $ is not used (this is for compatibility with other libraries).
Your solution of wrapping it in function will work fine, or you can load jQuery some other way (but that's probably not a good idea in Wordpress).
If you must use document.ready, you can actually pass $ into the function call:
jQuery(function ($) { ...
This should fix it:
jQuery(document).ready(function($){
//you can now use $ as your jQuery object.
var body = $( 'body' );
});
Put simply, WordPress runs their own scripting before you can and they release the $ var so it won't collide with other libraries. This makes total sense, as WordPress is used for all kinds of web sites, apps, and of course, blogs.
From their documentation:
The jQuery library included with WordPress is set to the noConflict()
mode (see wp-includes/js/jquery/jquery.js). This is to prevent
compatibility problems with other JavaScript libraries that WordPress
can link.
In the noConflict() mode, the global $ shortcut for jQuery is not
available...
This solution worked for me
;(function($){
// your code
})(jQuery);
Move your code inside the closure and use $ instead of jQuery
I found the above solution in https://magento.stackexchange.com/questions/33348/uncaught-typeerror-undefined-is-not-a-function-when-using-a-jquery-plugin-in-ma
...after searching too much
var $=jQuery.noConflict();
$(document).ready(function(){
// jQuery code is in here
});
Credit to Ashwani Panwar and Cyssoo answer: https://stackoverflow.com/a/29341144/3010027
Reasons why in WordPress jQuery and not $ is used: https://pippinsplugins.com/why-loading-your-own-jquery-is-irresponsible/
You can avoid confliction like this
var jq=jQuery.noConflict();
jq(document).ready(function(){
alert("Hi this will not conflict now");
jq('selector').show();
});
Try this:
<script language="JavaScript" type="text/javascript" src="jquery/jquery.js"></script>
<script>
jQuery.noConflict();
(function ($) {
function readyFn() {
// Set your code here!!
}
$(document).ready(readyFn);
})(jQuery);
</script>
Also, I find the good solution for use jQuery noConflict mode.
(function($){
$(document).ready(function(){
// write code here
});
// or also you can write jquery code like this
jQuery(document).ready(function(){
// write code here
});
})(jQuery);
I found this solution from here TryVary.com.
You have to pass $ in function()
<script>
jQuery(document).ready(function($){
// jQuery code is in here
});
</script>
replace $ sign with jQuery
like this:
jQuery(function(){
//your code here
});
Double check your jQuery references. It is possible that you are either referencing it more than once or you are calling your function too early (before jQuery is defined). You can try as mentioned in my comments and put any jQuery reference at the top of your file (in the head) and see if that helps.
If you use the encapsulation of jQuery it shouldn't help in this case. Please try it because I think it is prettier and more obvious, but if jQuery is not defined you will get the same errors.
In the end... jQuery is not currently defined.
Use
jQuery(document).
instead of
$(document).
or
Within the function, $ points to jQuery as you would expect
(function ($) {
$(document).
}(jQuery));
(function( $ ) {
"use strict";
$(function() {
//Your code here
});
}(jQuery));
What worked for me. The first library to import is the query library and right then call the jQuery.noConflict() method.
<head>
<script type="text/javascript" src="jquery.min.js"/>
<script>
var jq = jQuery.noConflict();
jq(document).ready(function(){
//.... your code here
});
</script>
<script>
var jq=jQuery.noConflict();
(function ($)
{
function nameoffunction()
{
// Set your code here!!
}
$(document).ready(readyFn);
})(jQuery);
now use jq in place of jQuery
You come across this issue when your function name and one of the id names in the file are same. just make sure all your id names in the file are unique.
You can use
jQuery(document).ready(function(){ ...... });
or
(function ($) { ...... }(jQuery));
wp_enqueue_script( string $handle, string $src = '', string[] $deps = array(), string|bool|null $ver = false, bool $in_footer = false )
If you are using jquery for frontend, you can achieve it by passing $deps as jquery

innerHTML.replace works in jsfiddle but not in browser

I have such problem:
I have a software which make an order confirmation in .html . I had to figure out how to delate some strings which I do not want to have on confirmation. Because of fact that I have not enough knowledge, I made something like that :
<script type="text/javascript">
document.body.innerHTML=document.body.innerHTML.replace(/<div id="boxik"><div class="nazwa">SZ.*font>/, '');
</script>
Very unprofessional code to remove everything between some div, but it is enough for my solution. It works perfectly in jsfiddle, but not in any browser. Maybe I should load so jquery libary ? I am not sure it is why I am asking for help.
http://jsfiddle.net/LTfyH/79/
Be aware of the fact you're using the id boxik two times. You can only use a id once.
If you want to remove only one element you can use something like:
var el = document.getElementById('boxik');
el.parentNode.removeChild(el);
If you want to remove multiple elements you can select them based on a class for example:
var elementsToRemove = document.querySelectorAll('.remove-me');
A example of both methods:
http://jsfiddle.net/LTfyH/81/
Notice that i added the class remove-me on two elements.
Try to do it in the document onload if you are using pure javascript:
(function () {
document.body.innerHTML=document.body.innerHTML.replace(/<div id="boxik"><div class="nazwa">SZ.*font>/, '');
})();
Or if you are using jQuery:
$(function() {
document.body.innerHTML=document.body.innerHTML.replace(/<div id="boxik"><div class="nazwa">SZ.*font>/, '');
});

Javascript / jQuery: Why do I keep getting undefined?

I have the following html code:
<a class="tabTitle" id="title_boxtab_default" tab-type="default" href="#tabs-3">Sample</a>
In jQuery I'm trying to get the value of the href attribute with:
$('.tabTitle').last().attr('href');
But it keeps telling me it's undefined?
I should mention that the number of links with class"tabTitle" increases. That's why I use .last()
Works just fine for me in JSFiddle. I changed it to this, and it returned #tabs-3:
alert($('.tabTitle').last().attr('href'));
My guess is that it's not running from a ready handler like this:
$(function() {
var x = $('.tabTitle').last().attr('href');
});
It should work. Make sure you are running the script when the element is present in the DOM, f.ex using .ready():
$(function() {
alert( $('.tabTitle').last().attr('href') );
});
DEMO: http://jsbin.com/IyeSacU/1/edit
Try DOM Ready
$(document).ready(function(){
$('.tabTitle').last().attr('href');
});
Fiddle

Toggleclass not working, altough should

This is pretty basic, still doesn't work... I'm trying to change the class of my button, which has the id "nav_list". I wrote the script:
var specialSection = document.getElementById("nav_list");
specialSection.onclick = function() {
alert("what");
$('#nav_list').toggleClass('active');
};
I get the "what" alert, but the class isn't toggled. What am I missing? Thanks in advance!
toggleClass is a jQuery method, for use it you must include jQuery in your page.
Like:
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
At the moment if you check the console you must see an error like (demo: http://jsfiddle.net/IrvinDominin/GyaBY/):
ReferenceError: Can't find variable: $
Avoid mixing jQuery and javascript event binding so your code will look like:
$('#nav_list').click(function() {
alert("what");
$(this).toggleClass('active');
});
Demo: http://jsfiddle.net/IrvinDominin/GyaBY/2/

Run JavaScript function on element defined with jQuery

Not sure I titled this well.. show's that I'm in unfamiliar territory. How can I run a JavaScript function based off of the element called in a jQuery function?
Theory:
<script type="text/javascript">
$.fillit('video');
</script>
(run fillit on video tag present in page.. interchangable with other elements)
$.fillit = function(){
this is where it says "run on the tag defined in the jQuery function"
}):
$.fn.extend({
fillit : function(){...}
});
then...
$('.video').fillit();
Edit (after comments)
To fill a dom element with other elements/html:
var img = document.createElement('img');
img.setAttribute('src', 'somesrc.jpg');
$('.video').append(img);
or
$('.video').html('<img src="somesrc.jpg"/>');
You can do it the way you described like so
<script type="text/javascript" language="javascript">
$.fillit = function(content)
{
$("result").html(content);
}
//call function
$.fillit("HELLO WORLD");
</script>
or as Alexander just posted if you want to do it on the selected element.
I don't think adding functions directly to jquery with $.func = is a good idea though. If jQuery ever adds a fillit method your method will conflict with theirs.
technopeasant, it sounds like you are using a jquery plugin (in your example, a plugin called 'fillit') and it is asking you to run the plugin on a tag or series of tags. Sorry if I misunderstood your question.
If that is the case, all you need to do is one of two things. If you are trying to run it on a very specific element in the HTML page (one with an id like <div id="myvideo"></div>) then all you need to do is run:
$('#myvideo').fillit();
//Notice the '#' symbol, that looks up the element with an id of 'myvideo'
If you want to run the plugin on a series of elements (like all <p> tags in the entire document, you'd run something like:
$('p').fillit()
//notice no '#', it's just looking up all <p> tags regardless of ID.
Take a look at the jQuery documentation regarding selectors to get a more concrete idea of how these selectors work:
http://docs.jquery.com/How_jQuery_Works
Someone answered with a link to this: http://docs.jquery.com/Plugins/Authoring
exactly what I was looking for. claim your kudos!
(function( $ ){
$.fn.fillit = function() {
this.fadeIn('normal', function(){
var container = $("<div />").attr("id", "filled")
.appendTo(container);
});
};
})( jQuery );

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