Home > Developer > Ajax

Explanation of javascript English letter case-insensitive Conversion

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Next I will introduce to you how to use the toLocaleUpperCase (), toUpperCase (), toLocaleLowerCase (), and toLowerCase () functions of js to convert uppercase and lowercase letters. Next I will introduce it to you.

ToLocaleUpperCase converts all the letter characters in the string to uppercase and adapts to the current region settings in the host environment.


ToUpperCase converts all letters in the string to uppercase letters.

The Code is as follows: Copy code

<Script type = "text/javascript">

Var str = "hello world! "
Document. write (str. toUpperCase ())

</Script>

Result

Hello world!

ToLocaleLowerCase converts all the letter characters in the string to lowercase, taking into account the current region settings of the host environment.

ToLowerCase converts the letters in the string to lowercase letters.

The usage of the above four functions is basically the same. The following uses toLowerCase as an example:
 

The Code is as follows: Copy code

Var str = "Www. bKjia. c0m ";
Document. write (str. toLowerCase (); // output www. bKjia. c0m

We can see that toLocaleUpperCase and toUpperCase have the same functions. toLocaleLowerCase and toLowerCase have the same functions. What are their differences?

Example

The Code is as follows: Copy code


<Html>
<Head>
<Title> case-insensitive English letter conversion </title>
</Head>
<Body>
<Script language = "javascript">
<! --
Str = "JavaScript ";
Str1 = str. toLowerCase ();
Str2 = str. toUpperCase ();
Document. write ("str =" + str + "<br> ");
Document. write ("lower case:" + str1 + "<br> ");
Document. write ("uppercase:" + str2 + "<br> ");
// -->
</SCRIPT>
</Body>
</Html>

(1) The toLocaleUpperCase toLocaleLowerCase functions adapt to the current region settings in the host environment when converting characters in the string. In most cases, the result is the same as that obtained by using the toUpperCase toLowerCase function. However, if the language rules conflict with the conventional Unicode case-sensitivity ing method, the results will be different.

(2) The toUpperCase toLowerCase method does not convert non-letter characters in the string.


Instance

Convert JavaScript input letters to uppercase (jQuery)

The Code is as follows: Copy code

<Input type = "text" NAME = "pName" onkeypress = "keyPress ()">

<Script language = "JavaScript">
<Script>
$ (Function (){
$ ('Body'). layout ();
});
Function changeup ()
{
Var keyCode = event. keyCode;

Var realkey = String. fromCharCode (keyCode). toUpperCase ();
Alert (realkey );
Event. returnValue = realkey;
}
</Script>

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
javascript string compare case insensitive javascript capitalize first letter of every word javascript uppercase first letter of each word english date format letter letter date format english date in english letter define explanation of value
Related Article
JQuery AJAX Timeout Timeout problem detailed _jquery
The difference between traditional web development patterns a...
JQuery ajax File Download _ajax
Ajax various implementation methods compare _ajax
Ajax Getting Started Guide (ii)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More