jQuery Metadata selector - javascript

Hi I have lot of divs like this
<div class="card {toggle:'A'}">
<div class="card {toggle:'B'}">
<div class="card {toggle:'C'}">
<div class="card {toggle:'D'}">
Now I want to hide eg. B DIV. Im trying to
$(.class [toggle:A]).hide();
or some other combination, but nothig was working. Could you suggest any solution. Im using "Metadata - jQuery plugin for parsing metadata from elements".
Thanks a lot

EDIT
I didn't realize you were using the metadata plugin. You should be able to do something like
$("div.card").forEach(function(element) {
if (element.metadata().toggle === 'B') {
element.hide();
}
});
EDIT 2
The metadata plugin was deprecated in 2011:
"The Metadata plugin will be deprecated, in favor of similar
functionality provided by jQuery 1.4.3 and above."
Use jQuery's own .data() instead.
ORIGINAL
This seems like you're doing something wrong upstream. Why are you storing data in the class attribute? One option to consider is to use jquery's .data() to store stuff. I strongly suggest you take a look at doing something like that.
However, if you want to blindly plunge forward, I can help. CSS supports attribute selectors. In this case, you can use the [rel$=foo] form to match against the end of the class attribute:
$('div[class$="B\'}"]')
Note the messy escape characters involved.
A better solution is probably to use the [rel*=foo] form to match anywhere in the attribute:
$('div[class*="toggle:\'B\'"]')
I've made an example here:
http://jsfiddle.net/pabo/pxg0v8uq/
You can read a nice easy guide to attribute selectors here: http://css-tricks.com/attribute-selectors/

Related

Dojo: defining Select-like widget with Options declaratively

The goal is to write custom widget similar to Select with options. Options should be able to be specified declarative. Example:
<div data-dojo-type="MySelect">
<span class="my-select-option" data-dojo-type="MySelectOption>Foo</span>
<span class="my-select-option" data-dojo-type="MySelectOption>Bar</span>
</div>
The problem is that all <span>s get overwritten and removed. What is the way to handle them correctly inside MySelect's JavaScript file?
You can use data-dojo-props together with dojo/parser to decoratively configure your custom widget.
Here a quick example for a possible markup, please note:
Use data-dojo-type to specify your custom "class" for your widget.
Use data-dojo-props to pass to the constructor any sort of configuration information upon instantiation.
data-dojo-props is a HTML5 data attributes and works with the latest version of Dojo.
Markup in your HTML:
<div id="instanceId" data-dojo-type="nameSpace/class" data-dojo-props="data: 'some data'"></div>
This reading is a good start:
https://dojotoolkit.org/documentation/tutorials/1.10/declarative/
For more information about parsing:
https://dojotoolkit.org/reference-guide/1.10/dojo/parser.html

Find and replace an element's class using jQuery

The platform that I'm currently using does not allow me to change much of the HTML that's been designed, so to get around this, I need to use JQuery to find and replace a div with another div (or perhaps in simpler terms (incase I'm getting something wrong here), find text in the HTML and replace it with other text).
So, the original is:
<div class="title-desc-wrapper has-main-image" data-content-field="main-image">
I need it to be replaced with:
<div class="title-desc-wrapper no-main-image" data-content-field="main-image">
If anyone has any insight into how to do this, or could show me how, I would greatly appreciate it.
Just add the class has-main-image and remove the class no-main-image:
$('.title-desc-wrapper.has-main-image').removeClass('has-main-image').addClass('no-main-image');
..or you could use .toggleClass() to essentially replace the class:
$('.title-desc-wrapper.has-main-image').toggleClass('has-main-image no-main-image');
You can use the jQuery .toggleClass()
$(".has-main-image").toggleClass("has-main-image no-main-image");
Or simply you can remove the "has-main-image" and add the "no-main-image" class
$(".title-desc-wrapper.has-main-image").removeClass("has-main-image").addClass("no-main-image");
Or if you need animation, you can use jQuery UI .switchClass()
$(".title-desc-wrapper.has-main-image").switchClass("has-main-image","no-main-image", duration, easing , complete )
I hope that helps, good luck

How to select this element using JQuery?

I'm implementing some third-party web software for my company. It returns some html which I can't directly change. I'd like to make some minor updates using jQuery but am not familiar with this syntax.
<div c:id="container"> </div>
How do I find this div in the dom using jQuery? What is "c:id" anyway? I've never seen that syntax before.
Thanks.
c:id is just an html attribute like any other. You can access it in jQuery using the attribute selectors:
var container = $('[c\\:id="container"]');
Could you post the entire XML ?
It probably is an XML namespace define with xmlns:c={url}
You can;
var el = $('div[c\\:id="container"]');
(unescaped : being a pseudo-class)

Is there a JQuery tooltip plugin that supports HTML content and automatically positions tooltips?

I am searching for a Tooltip plugin/library for JQuery. It should be able to automaticlly position tooltips, like TipTip, and also support HTML content for the tips.
TipTip does fullfill both conditions, but:
Added HTML support with Tip Tip. You can now add HTML into the Title attribute (though this is not recommended if you want strictly valid code).
I believe this one does. For instance, this demo shows an image. You could easily have a bodyHandler that retrieves the HTML from an attribute on the element. For instance
foo
That's perfectly valid HTML, and the bodyHandler would look something like
return this.attr("data-tooltip"));
I didn't want to leave jquery native plugin and mess with additional libs, so I figured out quite simple solution:
$('.tooltips').tooltip({
content: function(){
return $(this).attr('title');
}
})
This way - your title attribute with HTML may be used successfully.
I like TipTip a lot. The "title" field usage is awkward, but you don't have to do that:
content: string (false by default) - HTML or String to use as the content for TipTip. Will overwrite content from any HTML attribute.
(via http://code.drewwilson.com/entry/tiptip-jquery-plugin)
This tooltip widget included in the jQuery UI library supports different automatic positions and HTML in the title attribute: http://api.jqueryui.com/tooltip/

How to store arbitrary data for some HTML tags

I'm making a page which has some interaction provided by javascript. Just as an example: links which send an AJAX request to get the content of articles and then display that data in a div. Obviously in this example, I need each link to store an extra bit of information: the id of the article. The way I've been handling it in case was to put that information in the href link this:
<a class="article" href="#5">
I then use jQuery to find the a.article elements and attach the appropriate event handler. (don't get too hung up on the usability or semantics here, it's just an example)
Anyway, this method works, but it smells a bit, and isn't extensible at all (what happens if the click function has more than one parameter? what if some of those parameters are optional?)
The immediately obvious answer was to use attributes on the element. I mean, that's what they're for, right? (Kind of).
<a articleid="5" href="link/for/non-js-users.html">
In my recent question I asked if this method was valid, and it turns out that short of defining my own DTD (I don't), then no, it's not valid or reliable. A common response was to put the data into the class attribute (though that might have been because of my poorly-chosen example), but to me, this smells even more. Yes it's technically valid, but it's not a great solution.
Another method I'd used in the past was to actually generate some JS and insert it into the page in a <script> tag, creating a struct which would associate with the object.
var myData = {
link0 : {
articleId : 5,
target : '#showMessage'
// etc...
},
link1 : {
articleId : 13
}
};
<a href="..." id="link0">
But this can be a real pain in butt to maintain and is generally just very messy.
So, to get to the question, how do you store arbitrary pieces of information for HTML tags?
Which version of HTML are you using?
In HTML 5, it is totally valid to have custom attributes prefixed with data-, e.g.
<div data-internalid="1337"></div>
In XHTML, this is not really valid. If you are in XHTML 1.1 mode, the browser will probably complain about it, but in 1.0 mode, most browsers will just silently ignore it.
If I were you, I would follow the script based approach. You could make it automatically generated on server side so that it's not a pain in the back to maintain.
If you are using jQuery already then you should leverage the "data" method which is the recommended method for storing arbitrary data on a dom element with jQuery.
To store something:
$('#myElId').data('nameYourData', { foo: 'bar' });
To retrieve data:
var myData = $('#myElId').data('nameYourData');
That is all that there is to it but take a look at the jQuery documentation for more info/examples.
Just another way, I personally wouldn't use this but it works (assure your JSON is valid because eval() is dangerous).
<a class="article" href="link/for/non-js-users.html">
<span style="display: none;">{"id": 1, "title":"Something"}</span>
Text of Link
</a>
// javascript
var article = document.getElementsByClassName("article")[0];
var data = eval(article.childNodes[0].innerHTML);
Arbitrary attributes are not valid, but are perfectly reliable in modern browsers. If you are setting the properties via javascript, than you don't have to worry about validation as well.
An alternative is to set attributes in javascript. jQuery has a nice utility method just for that purpose, or you can roll your own.
A hack that's going to work with pretty much every possible browser is to use open classes like this: <a class='data\_articleid\_5' href="link/for/non-js-users.html>;
This is not all that elegant to the purists, but it's universally supported, standard-compliant, and very easy to manipulate. It really seems like the best possible method. If you serialize, modify, copy your tags, or do pretty much anything else, data will stay attached, copied etc.
The only problem is that you cannot store non-serializable objects that way, and there might be limits if you put something really huge there.
A second way is to use fake attributes like: <a articleid='5' href="link/for/non-js-users.html">
This is more elegant, but breaks standard, and I'm not 100% sure about support. Many browsers support it fully, I think IE6 supports JS access for it but not CSS selectors (which doesn't really matter here), maybe some browsers will be completely confused, you need to check it.
Doing funny things like serializing and deserializing would be even more dangerous.
Using ids to pure JS hash mostly works, except when you try to copy your tags. If you have tag <a href="..." id="link0">, copy it via standard JS methods, and then try to modify data attached to just one copy, the other copy will be modified.
It's not a problem if you don't copy tags, or use read only data. If you copy tags and they're modified you'll need to handle that manually.
Using jquery,
to store: $('#element_id').data('extra_tag', 'extra_info');
to retrieve: $('#element_id').data('extra_tag');
I know that you're currently using jQuery, but what if you defined the onclick handler inline. Then you could do:
<a href='/link/for/non-js-users.htm' onclick='loadContent(5);return false;'>
Article 5</a>
You could use hidden input tags. I get no validation errors at w3.org with this:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang='en' xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'>
<head>
<meta content="text/html;charset=UTF-8" http-equiv="content-type" />
<title>Hello</title>
</head>
<body>
<div>
<a class="article" href="link/for/non-js-users.html">
<input style="display: none" name="articleid" type="hidden" value="5" />
</a>
</div>
</body>
</html>
With jQuery you'd get the article ID with something like (not tested):
$('.article input[name=articleid]').val();
But I'd recommend HTML5 if that is an option.
Why not make use of the meaningful data already there, instead of adding arbitrary data?
i.e. use <a href="/articles/5/page-title" class="article-link">, and then you can programmatically get all article links on the page (via the classname) and the article ID (matching the regex /articles\/(\d+)/ against this.href).
As a jQuery user I would use the Metadata plugin. The HTML looks clean, it validates, and you can embed anything that can be described using JSON notation.
This is good advice. Thanks to #Prestaul
If you are using jQuery already then you should leverage the "data"
method which is the recommended method for storing arbitrary data on a
dom element with jQuery.
Very true, but what if you want to store arbitrary data in plain-old HTML? Here's yet another alternative...
<input type="hidden" name="whatever" value="foobar"/>
Put your data in the name and value attributes of a hidden input element. This might be useful if the server is generating HTML (i.e. a PHP script or whatever), and your JavaScript code is going to use this information later.
Admittedly, not the cleanest, but it's an alternative. It's compatible with all
browsers and is valid XHTML. You should NOT use custom attributes, nor should you really use attributes with the 'data-' prefix, as it might not work on all browsers. And, in addition, your document will not pass W3C validation.
As long as you're actual work is done serverside, why would you need custom information in the html tags in the output anyway? all you need to know back on the server is an index into whatever kind of list of structures with your custom info. I think you're looking to store the information in the wrong place.
I will recognize, however unfortunate, that in lots of cases the right solution isn't the right solution. In which case I would strongly suggest generating some javascript to hold the extra information.
Many years later:
This question was posted roughly three years before data-... attributes became a valid option with the advent of html 5 so the truth has shifted and the original answer I gave is no longer relevant. Now I'd suggest to use data attributes instead.
<a data-articleId="5" href="link/for/non-js-users.html">
<script>
let anchors = document.getElementsByTagName('a');
for (let anchor of anchors) {
let articleId = anchor.dataset.articleId;
}
</script>
I advocate use of the "rel" attribute. The XHTML validates, the attribute itself is rarely used, and the data is efficiently retrieved.
So there should be four choices to do so:
Put the data in the id attribute.
Put the data in the arbitrary attribute
Put the data in class attribute
Put your data in another tag
http://www.shanison.com/?p=321
You could use the data- prefix of your own made attribute of a random element (<span data-randomname="Data goes here..."></span>), but this is only valid in HTML5. Thus browsers may complain about validity.
You could also use a <span style="display: none;">Data goes here...</span> tag. But this way you can not use the attribute functions, and if css and js is turned off, this is not really a neat solution either.
But what I personally prefer is the following:
<input type="hidden" title="Your key..." value="Your value..." />
The input will in all cases be hidden, the attributes are completely valid, and it will not get sent if it is within a <form> tag, since it has not got any name, right?
Above all, the attributes are really easy to remember and the code looks nice and easy to understand. You could even put an ID-attribute in it, so you can easily access it with JavaScript as well, and access the key-value pair with input.title; input.value.
One possibility might be:
Create a new div to hold all the extended/arbitrary data
Do something to ensure that this div is invisible (e.g. CSS plus a class attribute of the div)
Put the extended/arbitrary data within [X]HTML tags (e.g. as text within cells of a table, or anything else you might like) within this invisible div
Another approach can be to store a key:value pair as a simple class using the following syntax :
<div id="my_div" class="foo:'bar'">...</div>
This is valid and can easily be retrieved with jQuery selectors or a custom made function.
In html, we can store custom attributes with the prefix 'data-' before the attribute name like
<p data-animal='dog'>This animal is a dog.</p>.
Check documentation
We can use this property to dynamically set and get attributes using jQuery like:
If we have a p tag like
<p id='animal'>This animal is a dog.</p>
Then to create an attribute called 'breed' for the above tag, we can write:
$('#animal').attr('data-breed', 'pug');
To retrieve the data anytime, we can write:
var breedtype = $('#animal').data('breed');
At my previous employer, we used custom HTML tags all the time to hold info about the form elements. The catch: We knew that the user was forced to use IE.
It didn't work well for FireFox at the time. I don't know if FireFox has changed this or not, but be aware that adding your own attributes to HTML elements may or may-not be supported by your reader's browser.
If you can control which browser your reader is using (i.e. an internal web applet for a corporation), then by all means, try it. What can it hurt, right?
This is how I do you ajax pages... its a pretty easy method...
function ajax_urls() {
var objApps= ['ads','user'];
$("a.ajx").each(function(){
var url = $(this).attr('href');
for ( var i=0;i< objApps.length;i++ ) {
if (url.indexOf("/"+objApps[i]+"/")>-1) {
$(this).attr("href",url.replace("/"+objApps[i]+"/","/"+objApps[i]+"/#p="));
}
}
});
}
How this works is it basically looks at all URLs that have the class 'ajx' and it replaces a keyword and adds the # sign... so if js is turned off then the urls would act as they normally do... all "apps" (each section of the site) has its own keyword... so all i need to do is add to the js array above to add more pages...
So for example my current settings are set to:
var objApps= ['ads','user'];
So if i have a url such as:
www.domain.com/ads/3923/bla/dada/bla
the js script would replace the /ads/ part so my URL would end up being
www.domain.com/ads/#p=3923/bla/dada/bla
Then I use jquery bbq plugin to load the page accordingly...
http://benalman.com/projects/jquery-bbq-plugin/
I have found the metadata plugin to be an excellent solution to the problem of storing arbitrary data with the html tag in a way that makes it easy to retrieve and use with jQuery.
Important: The actual file you include is is only 5 kb and not 37 kb (which is the size of the complete download package)
Here is an example of it being used to store values I use when generating a google analytics tracking event (note: data.label and data.value happen to be optional params)
$(function () {
$.each($(".ga-event"), function (index, value) {
$(value).click(function () {
var data = $(value).metadata();
if (data.label && data.value) {
_gaq.push(['_trackEvent', data.category, data.action, data.label, data.value]);
} else if (data.label) {
_gaq.push(['_trackEvent', data.category, data.action, data.label]);
} else {
_gaq.push(['_trackEvent', data.category, data.action]);
}
});
});
});
<input class="ga-event {category:'button', action:'click', label:'test', value:99}" type="button" value="Test"/>
My answer might not apply to your case. I needed to store a 2D table in HTML, and i needed to do with fewest possible keystrokes. Here's my data in HTML:
<span hidden id="my-data">
IMG,,LINK,,CAPTION
mypic.jpg,,khangssite.com,,Khang Le
funnypic.jpg,,samssite.com,,Smith, Sam
sadpic.png,,joyssite.com,,Joy Jones
sue.jpg,,suessite.com,,Sue Sneed
dog.jpg,,dogssite.com,,Brown Dog
cat.jpg,,catssite.com,,Black Cat
</span>
Explanation
It's hidden using hidden attribute. No CSS needed.
This is processed by Javascript. I use two split statements, first on newline, then on double-comma delimiter. That puts the whole thing into a 2D array.
I wanted to minimize typing. I didn't want to redundantly retype the fieldnames on every row (json/jso style), so i just put the fieldnames on the first row. That a visual key for the programmer, and also used by Javascript to know the fieldnames. I eliminated all braces, brackets, equals, parens, etc. End-of-line is record delimiter.
I use double-commas as delimiters. I figured no one would normally use double-commas for anything, and they're easy to type. Beware, programmer must enter a space for any empty cells, to prevent unintended double-commas. The programmer can easily use a different delimiter if they prefer, as long as they update the Javascript. You can use single-commas if you're sure there will be no embedded commas within a cell.
It's a span to ensure it takes up no room on the page.
Here's the Javascript:
// pull 2D text-data into array
let sRawData = document.querySelector("#my-data").innerHTML.trim();
// get headers from first row of data and load to array. Trim and split.
const headersEnd = sRawData.indexOf("\n");
const headers = sRawData.slice(0, headersEnd).trim().split(",,");
// load remaining rows to array. Trim and split.
const aRows = sRawData.slice(headersEnd).trim().split("\n");
// trim and split columns
const data = aRows.map((element) => {
return element.trim().split(",,");
});
Explanation:
JS uses lots of trims to get rid of any extra whitespace.

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