Central Javascript Text

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In this CSS tutorial, we’ll see how to center text and lock elements. There are several tips you can use to center elements horizontally and vertically in a layout.

To center aligned text in a larger element, use text-align: center; as shown below:

I am a div

And all the text is centered by text-align: center

Alignment central block elements:

The centering of block elements is best illustrated using the tag of an HTML document. What you need to do is check the overall width of the container, then set the margin to auto:

I’m a div

And all the text is centered by text-align: center

Align the image to the center:

To center an image, in the CSS selector, modify the mass display then control the width of the image element, using % or px. Set margin to auto:

I’m a div

And all the text is centered by text-align: center

To center the underlying image, change the display to block then set the margins to auto, check the width using px or%

kittens

Center vertically and horizontally in a div:

padding:

To center vertically in a - you can then use text-align: center to center the paragraph horizontally: < br>

I’m a div

And all the text is centered by text-align: center

To center the underlying image, change the display to block then set the margins to auto, check the width using px or%

kittens

line-height:

You can also set line-height to the height of the block element that you center with the text -align: center to align the element to the center. If you have multiple lines, use line-height on parent and child and add vertical-align: middle and display: inline-block to the child: < br>

transform:

Another way to center elements is to use position and transformation. Place the parent in position: relative, the child in absolute position. The child element will need to be positioned top and left at 50%, then we’ll use the transform property to adjust the text in the div. We’ll talk more about this property in another article, so it’s okay if it’s not 100% clear at the moment:

flexbox:

Finally, we can center the elements using flexbox. Set display: flex to the parent element of the children you want to center, then use align-items and require-content to center it:

These are the most common ways to solve the element centering problem in Layout.

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Central Javascript Text absolute: Questions

absolute

How to get an absolute file path in Python

3 answers

izb By izb

Given a path such as "mydir/myfile.txt", how do I find the file"s absolute path relative to the current working directory in Python? E.g. on Windows, I might end up with:

"C:/example/cwd/mydir/myfile.txt"
877

Answer #1

>>> import os
>>> os.path.abspath("mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

Also works if it is already an absolute path:

>>> import os
>>> os.path.abspath("C:/example/cwd/mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

Central Javascript Text absolute: Questions

absolute

How to check if a path is absolute path or relative path in a cross-platform way with Python?

3 answers

UNIX absolute path starts with "/", whereas Windows starts with alphabet "C:" or "". Does python have a standard function to check if a path is absolute or relative?

175

Answer #1

os.path.isabs returns True if the path is absolute, False if not. The documentation says it works in windows (I can confirm it works in Linux personally).

os.path.isabs(my_path)

Central Javascript Text absolute: Questions

absolute

How to join absolute and relative urls?

3 answers

I have two urls:

url1 = "http://127.0.0.1/test1/test2/test3/test5.xml"
url2 = "../../test4/test6.xml"

How can I get an absolute url for url2?

139

Answer #1

You should use urlparse.urljoin :

>>> import urlparse
>>> urlparse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

With Python 3 (where urlparse is renamed to urllib.parse) you could use it as follow:

>>> import urllib.parse
>>> urllib.parse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

JavaScript

JSON datetime between Python and JavaScript

4 answers

kevin By kevin

I want to send a datetime.datetime object in serialized form from Python using JSON and de-serialize in JavaScript using JSON. What is the best way to do this?

403

Answer #1

You can add the "default" parameter to json.dumps to handle this:

date_handler = lambda obj: (
    obj.isoformat()
    if isinstance(obj, (datetime.datetime, datetime.date))
    else None
)
json.dumps(datetime.datetime.now(), default=date_handler)
""2010-04-20T20:08:21.634121""

Which is ISO 8601 format.

A more comprehensive default handler function:

def handler(obj):
    if hasattr(obj, "isoformat"):
        return obj.isoformat()
    elif isinstance(obj, ...):
        return ...
    else:
        raise TypeError, "Object of type %s with value of %s is not JSON serializable" % (type(obj), repr(obj))

Update: Added output of type as well as value.
Update: Also handle date

JavaScript

What blocks Ruby, Python to get Javascript V8 speed?

4 answers

Are there any Ruby / Python features that are blocking implementation of optimizations (e.g. inline caching) V8 engine has?

Python is co-developed by Google guys so it shouldn"t be blocked by software patents.

Or this is rather matter of resources put into the V8 project by Google.

260

Answer #1

What blocks Ruby, Python to get Javascript V8 speed?

Nothing.

Well, okay: money. (And time, people, resources, but if you have money, you can buy those.)

V8 has a team of brilliant, highly-specialized, highly-experienced (and thus highly-paid) engineers working on it, that have decades of experience (I"m talking individually – collectively it"s more like centuries) in creating high-performance execution engines for dynamic OO languages. They are basically the same people who also created the Sun HotSpot JVM (among many others).

Lars Bak, the lead developer, has been literally working on VMs for 25 years (and all of those VMs have lead up to V8), which is basically his entire (professional) life. Some of the people writing Ruby VMs aren"t even 25 years old.

Are there any Ruby / Python features that are blocking implementation of optimizations (e.g. inline caching) V8 engine has?

Given that at least IronRuby, JRuby, MagLev, MacRuby and Rubinius have either monomorphic (IronRuby) or polymorphic inline caching, the answer is obviously no.

Modern Ruby implementations already do a great deal of optimizations. For example, for certain operations, Rubinius"s Hash class is faster than YARV"s. Now, this doesn"t sound terribly exciting until you realize that Rubinius"s Hash class is implemented in 100% pure Ruby, while YARV"s is implemented in 100% hand-optimized C.

So, at least in some cases, Rubinius can generate better code than GCC!

Or this is rather matter of resources put into the V8 project by Google.

Yes. Not just Google. The lineage of V8"s source code is 25 years old now. The people who are working on V8 also created the Self VM (to this day one of the fastest dynamic OO language execution engines ever created), the Animorphic Smalltalk VM (to this day one of the fastest Smalltalk execution engines ever created), the HotSpot JVM (the fastest JVM ever created, probably the fastest VM period) and OOVM (one of the most efficient Smalltalk VMs ever created).

In fact, Lars Bak, the lead developer of V8, worked on every single one of those, plus a few others.

JavaScript

Django Template Variables and Javascript

4 answers

When I render a page using the Django template renderer, I can pass in a dictionary variable containing various values to manipulate them in the page using {{ myVar }}.

Is there a way to access the same variable in Javascript (perhaps using the DOM, I don"t know how Django makes the variables accessible)? I want to be able to lookup details using an AJAX lookup based on the values contained in the variables passed in.

256

Answer #1

The {{variable}} is substituted directly into the HTML. Do a view source; it isn"t a "variable" or anything like it. It"s just rendered text.

Having said that, you can put this kind of substitution into your JavaScript.

<script type="text/javascript"> 
   var a = "{{someDjangoVariable}}";
</script>

This gives you "dynamic" javascript.

We hope this article has helped you to resolve the problem. Apart from Central Javascript Text, check other absolute-related topics.

Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Dmitry Wu

Tallinn | 2022-12-01

Maybe there are another answers? What Central Javascript Text exactly means?. I am just not quite sure it is the best method

Jan Zelotti

New York | 2022-12-01

Simply put and clear. Thank you for sharing. Central Javascript Text and other issues with JavaScript was always my weak point 😁. I just hope that will not emerge anymore

Marie Richtgofen

Shanghai | 2022-12-01

Simply put and clear. Thank you for sharing. Central Javascript Text and other issues with sin was always my weak point 😁. I just hope that will not emerge anymore

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