I am creating a data scraper and I need to collect a certain class in a nodelist:
let renewButtons = document.querySelectorAll('a._7s5_._3-95._4jy0._4jy3._517h._51sy._42ft')
These renewButtons are enabled and clickable buttons. My issue arises with the disabled buttons on the page. Their class names are:
_7s5_ _3-95 _4jy0 _4jy3 _517h _51sy _42ft _42fr
which is the same class as the enabled buttons except for the _42fr class added at the end. Everytime I querySelectorAll I get a nodelist of both enabled and disabled buttons. Is there a way to specify selecting only the enabled buttons? (selecting a class that matches exactly and only the specified classes)
You can try the use of pseudo selectors.
These are not actualy selectors, but consider them like "meta" selectors that each browser usually knows how to handle.
In your case you would use the :disabled selector.
Take a look here and here for more info on this, hope this helps!
You could use :enabled in your query selector like in an example below:
// will console only enabled `.btn` elements
console.log(document.querySelectorAll(".btn:enabled"))
<button class="btn">Enabled</button>
<button class="btn disabled" disabled>Disabled</button>
Related
I have below html and want to get the element based on 'natural' class. The reason is I get t dynamic classes after 'natural'
<coral-checkbox class="natural coral-Form-field coral3-Checkbox" ></coral-checkbox>
I am trying below code to get hide the element but it is not working.
$("coral-checkbox[class='.natural']").hide();
But it is working when I select entire class like below but I need to do with only 'natural'. Is this possible ?
$("coral-checkbox[class='.natural coral-Form-field coral3-Checkbox']").hide();
Use .classname to select based on any of the element's classed. When you use an attribute selector, it matches the entire attribute (unless you use modifiers like *=, but they're not appropriate here, either).
$("coral-checkbox.natural").hide();
Use the class the selector instead of the attribute selector:
$("coral-checkbox.natural").hide();
I don't know what is different between (I) and (II) ?
whether these class is same for use in a (js file/css file) or not
different ?
I: <div class="start-box active">
II: <div class="start-box">
in I you have two class start-box and active but in II you have just one class.
you can use js to add or delete class from element. and with css you can set some css property for the active when use event handler
you can read this link HTML Event Attributes
The class name attribute of an element accepts a single class name, or a space separated list of class names.
So in
<div class="start-box active">
the div element has two classes, start-box and active, whereas in
<div class="start-box">
the div element is only assigned the one class, start-box.
The combination of multiple classes on one element, or even the effect of a single class on an element given its relationship to other elements, is subject to the rules of cascading style sheets (meaning "CSS") .
I wish you well in learning more about CSS - you may find that the article "Learn to style HTML using CSS"](https://developer.mozilla.org/en-US/docs/Learn/CSS) on MDN useful in doing so.
I am learning jQuery and a few of the problems in my class have been having me do selector practice.
This is probably hella basic, but how do I know if that specific HTML or CSS element I'm selecting requires it to be $('#element') or $('.element') instead of just $('element')?
jQuery (and the DOM functions document.querySelector and document.querySelectorAll) are using CSS selectors to select elements from the DOM.
So basically you look at (an) HTML element(s) and try to find something that identifies the element(s), for instance if you want one particular button:
<button id="login">Login</button>
You can use its id. IDs are by definition unique on the page, so you'll always get that button (or nothing if the ID is different or the button doesn't exist). The "id" selector is a # in front of the actual id, so you'd use #login here.
But what if you want to select multiple items that are similar? For instance:
<li class="menu-item">Home</li>
<li class="menu-item">Shop</li>
<li class="menu-button">Logout</li>
What if you want the all the menu-item elements, but not the menu-button?
This time you can use their class attribute. The class selector is prefixed with a ., so you'd use .menu-item to select those two elements.
There are many other elements and CSS has quite a bit of syntax. Here are a few examples:
You can select by the element's tagname: button selects all <button> elements
You can select by any attribute: button[disabled] selects all buttons with a disabled attribute like <button disabled>n/a</button>
You can select based on their parent: li img selects all the images that are directly embedded in a <li> element
I highly recommend reading the MDN article for more information.
I have those two elements in my html
<p id="fullday" hidden="true" >Full Day</p>
<input type="checkbox" id="fullday" hidden="true" name="CheckIn">
in my js file when i call the function
$('#fullday').show();
only the <p> element is shown and the checkbox is still hidden..
thnx in advance
You have 2 issues here.
IDs must be unique
Instead use classes, which can be used on multiple elements to identify a set of elements.
hidden="none" is a non standard way of hiding values that you want to show. From the usage recommendations at MDN
This attribute must not be used to hide content that could be legitimately be shown. For example, it shouldn't be used to hide tabs panels of a tabbed interface, as this is a styling decision and another style showing them would lead to a perfectly correct page.
https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#hidden
Use display:none instead, as below, or hide with CSS.
<p class="fullday" style="display:none" >Full Day</p>
<input type="checkbox" class="fullday" style="display:none" name="CheckIn">
Then the js is just
$(".fullday").show();
ID must be UNIQUE!
try to use class instead and $('.fullday') selector.
Look at what W3 schools has to say:
The id selector is used to specify a style for a single, unique element.
The class selector is used to specify a style for a group of elements. Unlike the id selector, the class selector is most often used on several elements.
Learn the difference between IDs and Classes. Good luck!
I'm a little confused about HTML classes and IDs, as I'd like to use them BOTH to describe an HTML element. Is this valid and supported by most browsers?
The motivation for me to use both is this:
I have a CSS style that I would like applied to multiple elements.
I have some AJAX and Javascript that will manipulate those same elements, so I need a way to identify which element is which using an ID.
So I'd like to use an id to identify each element for JS manipulation AND at the same time I would like to specify a class so that the same style is applied from the same css.
An ID would be unique to only one item, where a class can be used to group many items together. You can use them together as you stated, ID as a unique identifier for Javascript and the class to markup with CSS.
Search for html class vs id to get many articles about this topic.
Example:
<ul>
<li class="odd" id="item1">First Item in the List</li>
<li class="even" id="item2">Second Item in the List</li>
<li class="odd" id="item3">Third Item in the List</li>
</ul>
Yes, it is perfectly valid to use both the ID and Class properties in one element. Example:
<div class="infoBox" id="myUniqueStyle"> *content* </div>
Still, keep in mind that an ID can only be used once (hence its name), while you can use classes as many times as you'd like througout a document. You can still use both the ID and the class to apply styles, while only the ID is a simple way of reaching the element through javascript.
A good way of doing it is applying IDs to all elements that you know are unique (header, navigation, main containers etc.), and classes to everything else.
"Is the" applies to elements using ID: "This is the navigation bar", "this is the header"
"Is a" or "is an" applies to elements using classes: "This is a blogPost", "this is an infoBox" etc.
You can definitely use both if you need to.
An ID is typically used to identify structural sections of your site - you should have only one element with a particular ID and any element can have only one ID.
A class is used to set styles which might be used in more than one place in your HTML file - any element can have multiple classes set.
A typical HTML document using both IDs and classes might be something like
<html>
...
<body>
<div id="header"></div>
<ul id="nav" class="full-width dark">...</ul>
<div id="content">
<div id="important-container" class="class-set-by-javascript another-class-set-by-javascript"></div>
</div>
</body>
</html>
Yes, any normal browser should allow the setting of CSS classes regardless of element id. However, setting styles on a specific element (using ids, for example) may override styles set through a CSS class.
Just a very obscure note about combining class and id in your CSS declarations, there's a bug with IE6, if you have:
two or more pages which have an
element with the same id
those elements have different
classes
you're styling them using an
#idname.classname rule
then only the first rule in the stylesheet will take effect.
See this page for details
Yes it is valid in all browsers. ID expresses just the unique IDentification of your html control through others, and class applies some style to it. Use IDs when there is only one occurence per page. Use classes when there are one or more occurences per page.