well, I am trying to write parallel checkbox menus in html, but somehow my logic is not helping. May be some of you experts can just help me a bit. This is how I want my menus to look
[] Menu 1 [] Menu 2
[] Item 1 [] Item 5
[] Item 2 [] Item 4
Item 1, 2 are under Menu 1 and 5,4 are under Menu 2. Square brackets indicate checkboxes.
Items under menus are actually collected dynamically and their numbers under different menus can vary.
I would suggest using lists and floated divs. Lists can make it easy to nest as many checkbox trees as you'd like.
<div style="float:left;">
Menu 1
<ul>
<li>Item 1</li>
<li>Item 2
<ul>
<li>Item 2a</li>
<li>Item 2b</li>
</ul>
</li>
</ul>
</div>
<div style="float:left; margin-left:30px;">
Menu 2
<ul>
<li>Item 1</li>
<li>Item 2
<ul>
<li>Item 2a</li>
<li>Item 2b</li>
</ul>
</li>
</ul>
</div>
This would have double nesting. You can make as many checkboxes as you want at a certain indent interval by just adding more list items <li> to a given unordered list <ul> tag.
If your question is only about HTML and CSS, you can use padding and margin attributes to make appropriate indent.
If yuor question about programming logic for generating such tree structure, write please what language you are using.
You might want to look at the jquery library jstree. I use that for my treeview, it's definitely the most advanced treeview available.
it is amazingly configurable, and easy to use.
it has a checkbox plugin that I use in my project. That works perfectly for me.
The development is very active, so even if you might find an issue, the developer is very reactive and will help you.
take a look here : http://jstree.com
and the checkbox demo is here
good luck :)
Related
I am attempting to create a dropdown list in Angular containing sub-items (as in the image but with all options selectable). Does anybody please know how to achieve this in Angular using the < select > tag so that I don't have to change other code within my application, as I would if changing to an unordered list etc.
Thanks :)
dropdown list with sub-items
Consider using the groups of options provided by Angular/Material library. See the demo.
Use class= "dropdown-submenu"
<div class="btn-group dropdown">
<button class="dropdown-toggle">Toggle</button>
<ul class="dropdown-menu">
<li>Item 1</li>
<li>Item 2</li>
<li class="dropdown-submenu">
Sub List
<ul class="dropdown-menu">
<li>Submenu Item 1</li>
<li>Submenu Item 2</li>
</ul>
</li>
</ul>
</div>
or refer this https://mdbootstrap.com/support/general/how-to-create-a-nested-dropdown/
Grouping sub-items can be achieved using angular material library.
For multi select drop down you just have to add multiple property in select tag element for selecting multiple options.
see the stackblitz demo for reference.
For more such functionality using angular material, please refer angular material
I have a list of agenda items I want to display.
For that I would use a simple ul.
The thing is that within this list I have grouped the items by month. So in general they are sorted by date and now they are also grouped by month.
Example:
January 2010
- Item 1
– Item 2
February 2010
- Item 3
– Item 4
March 2010
- Item 5
– Item 6
How could I make this information more accessible.
I found this POST about role="group" which seems to be right here?!
https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_group_role
So would the following structure make sense?
<ul>
<li role="group">
<h3>January 2010</h3>
<ul>
<li>Item 1</li>
<li>Item 2</li>
</ul>
</li>
<li role="group">
<h3>February 2010</h3>
<ul>
<li>Item 3</li>
<li>Item 4</li>
</ul>
</li>
</ul>
Or how would I make clear that the nested ul is a group.
Or would I leave away the nested uls, build everything with a single ul with equal li for every entry?
Or would I do something like:
<div role="list">
<div>
<h3 id="label-1">January 2010</h3>
<ul aria-labelledby="label-1" role="group">
<div role="listitem">Item 1</div>
<div role="listitem">Item 2</div>
</ul>
</div>
<div>
<h3 id="label-2">February 2010</h3>
<ul aria-labelledby="label-2" role="group">
<div role="listitem">Item 3</div>
<div role="listitem">Item 4</div>
</ul>
</div>
</div>
I would be very glad for some inputs.
Thank you in advance.
cheers
role="group" is not intended for use on non-interactive items. It is designed to group controls such as inputs, buttons together or for grouping elements that are related.
Your third example is closest to the way this should be structured. The headings are great for quick navigation (as heading levels are one of the primary ways screen reader users navigate a page) and the relationships are created within the HTML itself, removing the need for any extra WAI-ARIA.
Yet again there is no need for role="group".
The following example would be perfectly acceptable and accessible. I have change it to a set of listed <ul> and <li> as that is semantically correct and removes the need for any WAI-ARIA there also. (Golden rule, use semantic elements if you can as support is 100% for those, support for WAI-ARIA is a little patchy still. and so should be used for complimentary information / if there is no way to achieve the desired document structure / relationships using standard HTML5 elements.)
Obviously if the Items 1 to 4 are interactive elements and you have left that out for brevity then that is a different matter entirely and I will change this answer.
<ul>
<li>
<h3>January 2010</h3>
<ul>
<li>Item 1</li>
<li>Item 2</li>
</ul>
</li>
<li>
<h3>February 2010</h3>
<ul>
<li>Item 3</li>
<li>Item 4</li>
</ul>
</li>
</ul>
When I insert some Text between two list items, the Text is aligned with the text of the list items and thus looks as if it were part of the preceding list item.
How do I get the Text inserted between two list items to be aligned with the bullet of the list items or, better yet, to stick out a bit.
This is about the plainest of plain html. (I am really a user of LaTeX---where I know how to do it!)
Here is an image:
Than you probaply need is to define two lists and between them insert the text your want.
<ul>
<li>item1 from list1</li>
</ul>
Between two lists
<ul>
<li>item1 from list2</li>
</ul>
If you insert text between two list items in HTML, you will produce invalid HTML. But what may be worse is that you will have a heard time styling it because there would be no clear way in CSS to target that content
Invalid
<ul>
<li>Item 1</li>
Some other text
<li>Item 2</li>
</ul>
Solution
You can however create 2 separate lists and inbetween use any HTML you want. You can also use paragraphs inside list items, or even embed lists in inside list items.
<ul>
<li>Item 1
<p>More text as part of the list item</p>
</li>
</ul>
<p>Some other text</p>
<ul>
<li>Item 2 contains another list
<ul>
<li>item 2a</li>
<li>item 2b</li>
</ul>
</ul>
For a list of portfolio-items, which all have a year, I am assuming an ordered list is the way to go semantically since it is a list ordered by year. However, I don't want the value to be a number starting at 1, but the year in which the item was created. To reach this result I wrote the following.
<ol>
<li value="2015">Last made item</li>
<li value="2015">Item before that</li>
<li value="2014">Earliest item</li>
</ol>
However, this
reverses the natural order of <ol>'s;
Uses the same marker multiple times;
so I would think this isn't exactly the best way to accomplish this. So I would like to know:
Do you have any suggestions on how to do improve this?
Are there any more reasons why this should not be done this way?
Edit: Please note the list has already been sorted, but I want the marker to be the year in which the item was created. This happens using the method mentioned earlier (see this Fiddle, too), but I'm doubting this is the best way to go, semantically.
1. Do you have any suggestions on how to do improve this?
Alternative A
A good alternative would be a structure like this:
<article>
<time datetime="2015">2015</time>
<h1>Last made item</h1>
<p>Description</p>
</article>
<article>
<time datetime="2015">2015</time>
<h1>Item before that</h1>
<p>Description</p>
</article>
<!-- etc. -->
This assumes the items in the list could be representable as a "independent item of content" (W3C specification) and a portfolio-item, which was the type of item in my question, meets this specification.
Alternative B
<ol>
<li>
<time datetime="2015">2015</time> Last made item
</li>
<li>
<time datetime="2015">2015</time> Item before that
</li>
<!-- etc. -->
</ol>
With CSS you could remove the marker if desirable. Thanks to TotempaaltJ for this alternative.
Either way the year is now machine readable as being time, see MDN.
This element is intended to be used presenting dates and times in a machine readable format. This can be helpful for user agents to offer any event scheduling for user's calendar.
Read Bruce Lawson's post on the time tag to see this datetime notation works/is allowed.
Now, “fuzzy dates” are possible:
<time datetime="1905"> means the year 1905
2. Are there any more reasons why this should not be done this way?
When using <li value="year"> you're losing the meaning of the number as being a year.
Other thoughts
#Michael_B's answer gave me more insight into the meaning of <ol> and <ul> and #tibzon gave an example with the reversed attribute of an ordered list, see his fiddle.
tag is not going to do any sorting algorithm for you. HTML is a markup language which is only used for displayed purpose. is only used for a order-list and you have to do the ordering your self.
If you content is generated using a backend language, then you can use the backend language to do the sorting algorithm and print whatever number you want in front. And since you don't want the number starting with 1, I would suggest you using instead.
For example, if you are using PHP for the backend language, you can use the following code:
echo "<li>".$year." - $content."</li>";
I am not sure your sorting algorithm so can't help with that. Hope this help.
If you want to create an ordered list in HTML and specify a starting number other than 1, you can use the start attribute in the ol tag.
<ol start="2014">
<li>Last made item</li>
<li>Item before that</li>
<li>Earliest item</li>
</ol>
Here's a DEMO.
UPDATE
Based on your revised question and new comments, I see that your focus is primarily on the semantics of the code. Specifically, is this code...
<ol>
<li value="2015">Last made item</li>
<li value="2015">Item before that</li>
<li value="2014">Earliest item</li>
</ol>
... semantically correct?
The answer is yes. Semantically, you're totally fine.
Features of the HTML Ordered List <ol>
An ordered list (ol) simply means the order of the list matters, whereas in an unordered list (ul) the order of each list item is unimportant, and each list item can be sorted randomly because the order doesn't matter.
Here's what the HTML5 spec says about ordered lists:
The ol element represents a list of items, where the items have been
intentionally ordered, such that changing the order would change the
meaning of the document.
Here's how MDN puts it:
The <ol> and <ul> both represent a list of items. They differ in the
way that, with the <ol> element, the order is meaningful. As a rule of
thumb to determine which one to use, try changing the order of the
list items; if the meaning is changed, the <ol> element should be
used, else the <ul> is adequate.
Here's what the HTML5 spec doesn't say:
It doesn't say the numbers or letters marking each line item have to be numbers or letters. They don't.
It doesn't say the numbers or letters marking each line item have to be in chronological order. They don't.
It doesn't even say that each line item must have a number, letter or other marker. It doesn't. It can be left blank (see CSS list-style-type: none).
These examples, where the order of the list has meaning, are valid and semantically correct HTML.
<ol>
<li value="2025">Portfolio 1</li>
<li value="2010">Portfolio 2</li>
<li value="1999">Portfolio 3</li>
<li value="2005">Portfolio 4</li>
<li value="2015">Portfolio 5</li>
<li value="2014">Portfolio 6</li>
</ol>
<ol type="a" reversed>
<li>Portfolio 1</li>
<li>Portfolio 2</li>
<li>Portfolio 3</li>
<li>Portfolio 4</li>
<li>Portfolio 5</li>
<li>Portfolio 6</li>
</ol>
<ol style="list-style-type: none;">
<li>Portfolio 1</li>
<li>Portfolio 2</li>
<li>Portfolio 3</li>
<li>Portfolio 4</li>
<li>Portfolio 5</li>
<li>Portfolio 6</li>
</ol>
Run examples in Fiddle
The W3 docs have a nested list example prefixed by DEPRECATED EXAMPLE:, but they never corrected it with a non-deprecated example, nor explained exactly what is wrong with the example.
So which of these ways is the correct way to write an HTML list?
Option 1: the nested <ul> is a child of the parent <ul>
<ul>
<li>List item one</li>
<li>List item two with subitems:</li>
<ul>
<li>Subitem 1</li>
<li>Subitem 2</li>
</ul>
<li>Final list item</li>
</ul>
Option 2: the nested <ul> is a child of the <li> it belongs in
<ul>
<li>List item one</li>
<li>List item two with subitems:
<ul>
<li>Subitem 1</li>
<li>Subitem 2</li>
</ul>
</li>
<li>Final list item</li>
</ul>
Option 2 is correct.
The nested list should be inside a <li> element of the list in which it is nested.
Link to the W3C Wiki on Lists (taken from comment below): HTML Lists Wiki.
Link to the HTML5 W3C ul spec: HTML5 ul. Note that a ul element may contain exactly zero or more li elements. The same applies to HTML5 ol.
The description list (HTML5 dl) is similar,
but allows both dt and dd elements.
More Notes:
dl = definition list.
ol = ordered list (numbers).
ul = unordered list (bullets).
Official W3C link (updated).
Option 2
<ul>
<li>Choice A</li>
<li>Choice B
<ul>
<li>Sub 1</li>
<li>Sub 2</li>
</ul>
</li>
</ul>
Nesting Lists - UL
Option 2 is correct: The nested <ul> is a child of the <li> it belongs in.
If you validate, option 1 comes up as an error in html 5 -- credit: user3272456
Correct: <ul> as child of <li>
The proper way to make HTML nested list is with the nested <ul> as a child of the <li> to which it belongs. The nested list should be inside of the <li> element of the list in which it is nested.
<ul>
<li>Parent/Item
<ul>
<li>Child/Subitem
</li>
</ul>
</li>
</ul>
W3C Standard for Nesting Lists
A list item can contain another entire list — this is known as "nesting" a list. It is useful for things like tables of contents, such as the one at the start of this article:
Chapter One
Section One
Section Two
Section Three
Chapter Two
Chapter Three
The key to nesting lists is to remember that the nested list should relate to one specific list item. To reflect that in the code, the nested list is contained inside that list item. The code for the list above looks something like this:
<ol>
<li>Chapter One
<ol>
<li>Section One</li>
<li>Section Two </li>
<li>Section Three </li>
</ol>
</li>
<li>Chapter Two</li>
<li>Chapter Three </li>
</ol>
Note how the nested list starts after the <li> and the text of the containing list item (“Chapter One”); then ends before the </li> of the containing list item. Nested lists often form the basis for website navigation menus, as they are a good way to define the hierarchical structure of the website.
Theoretically you can nest as many lists as you like, although in practice it can become confusing to nest lists too deeply. For very large lists, you may be better off splitting the content up into several lists with headings instead, or even splitting it up into separate pages.
If you validate , option 1 comes up as an error in html 5, so option 2 is correct.
I prefer option two because it clearly shows the list item as the possessor of that nested list. I would always lean towards semantically sound HTML.
Have you thought about using the TAG "dt" instead of "ul" for nesting lists? It's inherit style and structure allow you to have a title per section and it automatically tabulates the content that goes inside.
<dl>
<dt>Coffee</dt>
<dd>Black hot drink</dd>
<dt>Milk</dt>
<dd>White cold drink</dd>
</dl>
VS
<ul>
<li>Choice A</li>
<li>Choice B
<ul>
<li>Sub 1</li>
<li>Sub 2</li>
</ul>
</li>
</ul>
What's not mentioned here is that option 1 allows you arbitrarily deep nesting of lists.
This shouldn't matter if you control the content/css, but if you're making a rich text editor it comes in handy.
For example, gmail, inbox, and evernote all allow creating lists like this:
With option 2 you cannot do that (you'll have an extra list item), with option 1, you can.