I have one question. Is it any simple way to make class 'a' elements with if condition, class 'b' element always exist.
<div v-if="aaa===1" class='a'>
<div class='b'></div>
</div>
or i have to write two times.
<div v-if="aaa===1" class='a'>
<div class='b'></div>
</div>
<div v-else class ='b'></div>
i think writing two is really redundant
Related
I'm trying to locate and then read the list of text 1-5. All divs with class="col-md-6" have the same structure, so I'm trying to use the text from:
<h5>Header Unique Text</h5>
as it is the only unique element and then proceed to extract the texts but without using /div[x]/div[y] type xpath, as it won't be reliable in my case. I'm searching for a css selector(or even xpath) which uses sibling relations, maybe nth-child, related to the header tag or its parent div. However, I'm not sure you are even able to move backward in the DOM with css selectors.
Any help would be greatly appreciated.
<div class="row dashboard-admin-widgets">
<div class="col-md-6">...</div>
<div class="col-md-6">...</div>
<div class="col-md-6">
<div class="ibox float-e-margins">
<div class="ibox-title">
<h5>Header Unique Text</h5>
</div>
<div class="ibox-content">
<div>Text 1</div>
<div>Text 2</div>
<div>Text 3</div>
<div>Text 4</div>
<div>Text 5</div>
</div>
</div>
</div>
</div>
If it is the last child as shown you can use a last-child selector
.col-md-6:last-child .ibox-content div
You could also use nth-of-type
.col-md-6:nth-of-type(n) .ibox-content div
Or even last-of-type
.col-md-6:last-of-type .ibox-content div
You can use xpath to get the ancestor of <h5>Header Unique text</h5> like this:
//h5[normalize-space(.)='Header Unique Text']/ancestor::div[#class='ibox float-e-margins']/div[#class='ibox-content']/div
Let me break it down for you so you can adjust the xpath to your needs.
First, we look for <h5>Header Unique text</h5> and then we get its ancestor which is div[#class='ibox float-e-margins']. You can use any attribute, tag, just like you would write your xpath.
Now we are looking for elements in context of div[#class='ibox float-e-margins']. Then, use we look for all div elements with the text you desired.
Also, instead of using /ancestor::div, you can get first parent and look for it's sibling like this:
//h5[contains(text(), 'Header Unique Text')]/parent::div[#class='ibox-title']/following-sibling::div[#class='ibox-content']/div
I would like to know if, according to BEM methodology, I can have the following structure:
.block1
.block1__element1
.block2
.block1__element2 <-- ??
Am I allowed to use an element from a parent block, inside a children block?
Thanks.
UPDATE:
This is the actual DOM structure:
<div class="head">
<div class="head__user"></div>
<div class="head__nav">
<div class="menu">
// <-- ???
</div>
</div>
</div>
According to best practices of BEM methodology: am I allowed to move the element with head__user inside the menu block? Or all elements inside the menu block need to start with the menu__ prefix?
I hope this clears out the problem.
I been using BEM for sometime and from what I got it's not recommended nor intended to be used like that. You can nest different BEM elements to each other like menu-blockintohead-block, but menu-block items should not go outside its parent menu-block, like you should not put menu-block__item at the top of head-block. Does it makes sense? :)
To illustrate there are two ways to go. What should be noted here is that depending on the scale of your project and how you build things (component based?). If you don't have a large project and are not doing or reusing the menu else where you can do it both ways. Lets say your menu is huge amount of html/css I would do it like #1
This is not correct
<div class="head">
<div class="head__user"></div>
<div class="head__nav">
<div class="menu">
<div class="head__something"></div>
</div>
</div>
</div>
Recommended solution
Based on this part of the documentation. Now you can chop your own header design into blocks, does this below match?
<div class="head">
<div class="head__user"></div>
<div class="head__nav">
<div class="menu">
<div class="menu__something"><img src="" class="menu__image" /></div>
</div>
</div>
</div>
I think this variant is allowed:
<div class="head">
<div class="head__nav">
<div class="menu">
<div class="head__user"></div>
</div>
</div>
</div>
I haven't found the current part in the official BEM documentation, but I've found this part:
The block name defines the namespace, which guarantees that the elements are dependent on the block (block__elem).
A block can have a nested structure of elements in the DOM tree:
Example
<div class="block">
<div class="block__elem1">
<div class="block__elem2">
<div class="block__elem3"></div>
</div>
</div>
</div>
However, this block structure is always represented as a flat list of elements in the BEM methodology:
Example
.block {}
.block__elem1 {}
.block__elem2 {}
.block__elem3 {}
This allows you to change a block's DOM structure without making changes in the code for each separate element:
Example
<div class="block">
<div class="block__elem1">
<div class="block__elem2"></div>
</div>
<div class="block__elem3"></div>
</div>
The block's structure changes, but the rules for the elements and their names remain the same.
I understand it as there is only one rule about HTML structure for elements in BEM: an element has to be inside its block (it doesn't matter how deep).
One possible problem that I can imagine for this case is using some of BEM tree formats. But if you don't need it, I think there's no problem.
I would consider making the potential head__something into simply something, and then to provide multiple modifications of it. e.g. something--head and something--menu.
<div class="head">
<div class="head__user"></div>
<div class="head__nav">
<div class="menu">
<div class="something--menu" />
</div>
</div>
<div class="something--head" />
</div>
Also, refactoring further, I would consider getting rid of head__nav as it probably does not add any richer semantics than menu.
<div class="head">
<div class="head__user"></div>
<div class="menu">
<div class="something--menu" />
</div>
<div class="something--head">for those cases where you want <code>something</code> directly descending from <code>head</code></div>
</div>
Let's say I have a product within a collection. Is it appropriate to call the product "feature-collection__product" so it's still an element within the block of "feature-collection" or call it "feature-collection-product" so it becomes it's own block, as it has other elements within it, or something different.
<div class="feature-collection">
<div class="feature-collection__product">
<h2 class="feature-collection__product-title"></h2>
<h2 class="feature-collection__product-price"></h2>
</div>
</div>
OR
<div class="feature-collection">
<div class="feature-collection-product">
<h2 class="feature-collection-product__title"></h2>
<h2 class="feature-collection-product__price"></h2>
</div>
</div>
Most likely the correct answer is both:
<div class="feature-collection">
<div class="feature-collection__product product">
<h2 class="product__title"></h2>
<h2 class="product__price"></h2>
</div>
</div>
The situation when you have different entities on the same DOM node is called mix. In this case it's reasonable to have independent block product and also an element of feature-collection to set some styling for production inside feature-collection.
For more info about mixes please take a look at https://en.bem.info/methodology/key-concepts/#mix and https://en.bem.info/methodology/faq/#mixes
My HTML looks like that:
<div class="parent">
<div class="url">
LINK
</div>
<div class="stats">
<div class="a">12</div>
<div class="b">14</div>
</div>
</div>
<div class="parent">
<div class="url">
LINK
</div>
<div class="stats">
<div class="a">133</div>
<div class="b">13</div>
</div>
</div>
<div class="parent">
<div class="url">
LINK
</div>
<div class="stats">
<div class="a">4</div>
<div class="b">46</div>
</div>
</div>
Is this possible to get parent's child which is found by another, the same parent child?
So, I want to get contents of class b of second parent. But I want to find bu it's href parameter.
Like that-
XPath finds parent, which has child url and a with href parameter http://url.com/view/364
XPath takes contents of class b in the same parent
If you don't understand, I basically need that XPath gets number 13 (contents of b), but find it using href parameter.
Is this possible? How this can be done?
An even cleaner approach is (line break only for readability)
//div[#class = 'parent' and div[#class = 'url']
/a/#href = 'http://url.com/view/364']/div[#class = 'stats']/div[#class = 'b']
It is better than the answer you found yourself (actually, it's a good thing you found an answer yourself!) because there are no unnecessary parent axis (..) steps in it.
It is better than
(//a[#href='http://url.com/view/364']/following::div[#class='b'])[1]
because following::div[#class = 'b'] selects a div element that follows the context item, even if it is in another div[#class = 'parent']. For instance, if the document looked like
<html>
<div class="parent">
<div class="url">
LINK
</div>
<div class="stats">
<div class="a">133</div>
</div>
</div>
<div class="parent">
<div class="url">
LINK
</div>
<div class="stats">
<div class="a">4</div>
<div class="b">46</div>
</div>
</div>
</html>
then the result would be
<div class="b">46</div>
Well, a cleaner approach would be to use the following axis and then select the first node with class='b'.
"(//a[#href='http://url.com/view/364']/following::div[#class='b'])[1]"
I found the answer.
It is easy to do that -
//*[#class="parent"]/div[#class="url"]/a[#href="http://url.com/view/364"]/../../div[#class="stats"]/div[#class="b"]
I have the following html document
<div class="books">
<div class="book">
<div>
there are many deep nested elements here, somewhere there will be one span with some text e.g. 'mybooktext' within these
<div>
<div>
<div>
<span>mybooktext</span>
</div>
</div>
</div>
</div>
<div>
there are also many nested elements here, somewhere there will be a link with a class called 'mylinkclass' within these. (this is the element i want to find)
<div>
<div>
<a class="mylinkclass">Bla</a>
</div>
</div>
</div>
</div>
<div class="book">
<div>
there are many deep nested elements here, somewhere there will be one span with some text e.g. 'mybooktext' within these
<div>
<span>mybooktext</span>
</div>
<div>
</div>
<div>
there are also many nested elements here, somewhere there will be a link with a class called 'mylinkclass' within these. (this is the element i want to find)
<div>
<a class="mylinkclass">Bla</a>
</div>
</div>
</div>
<div class="book">
same as above
</div>
</div>
I want to find the link element (link has class called 'mylinkclass') within the book element, this will be based on the text of the span within the same book element.
So it would be something like:
-Find span with text 'mybooktext'
-Navigate up Book div
-Find link with class 'mylinkclass' within book div
This should be done using one xpath statement
In my few this is was your are looking for:
" //span[contains(text(),'mybooktext')]
/ancestor::div[#class='book']
//a[#class='mylinkclass']"
//span[contains(text(),'mybooktext')] Find san containing "mybooktext"
/ancestor::div[#class='book'] Navigate up Book div (in any deeps)
//a[#class='mylinkclass'] Find link with class 'mylinkclass' within book div (in any deeps)
Update:
change first condition to
//span[(text() ='mybooktext'] if mybooktext is the only text in span