JavaScript String
Object
Properties
length - The number of characters in the string.
<script type="text/javascript">
var txt = "Hello World!";
document.write(txt.length);
</script>
OUTPUT 12
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JavaScript String Object: Properties, Methods, and HTML Tags, Study notes of Computer Numerical Control
Various properties and methods of the javascript string object, including length, charat, concat, fromcharcode, indexof, slice, and regular expression syntax. Additionally, it covers methods that generate html tags such as big(), bold(), fontcolor(), fontsize(), italics(), small(), strike(), sub(), sup(), and link().
Typology: Study notes
2010/2011
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JavaScript String Object Properties length - The number of characters in the string.
OUTPUT 12
1. string.charAt(index) - returns the character at the specified index in a string. - If there is no character at the index, returns an empty string. - The first character is located at index
- var place = “Manipal" ; place.charAt(3) ; // ‘i’
3. string .concat(string2, string3, ..., stringX) - is used to join two or more strings. - This method does not change the existing strings, it only returns a copy of the joined strings.
4. String.fromCharCode(n1, n2, ..., nX) - Converts a list of Unicode values into a string containing the corresponding characters. document.write(String.fromCharCode(72,69, 76,76,79)); HELLO document.write(String.fromCharCode(65,66, 67,68,69,97,98,99,100,101));
6. indexOf(pattern, index) :- Returns -1 if the value is not found. Returns the position of the first occurrence of a specified value in a string Searching begins at the index value in the string.
7. lastIndexOf(pattern) - Returns -1 if the value is not found. - Returns the position of the last found occurrence of a specified pattern in a string. 8. lastIndexOf(pattern, index)
- Returns -1 if the value is not found.
- Returns the position of the last found occurrence of a specified pattern in a string.
- Searching begins at the index value in the string and searching towards the beginning of invoking String.
10. substr(start, length) Extracts the characters from a string, beginning at a specified start position, and through the specified number of character
OUTPUT lo world! lo w
11. toLowerCase() - Returns a copy of the string with all characters in lower case. 12. toUpperCase() - Returns a copy of the string with all characters in upper case.
hello world! HELLO WORLD!
Modifi er Description i Perform case-insensitive matching g Perform a global match (find all matches rather than stopping after the first match) [abc] Find any character between the brackets [^abc] Find any character not between the brackets [0-9] Find any digit from 0 to 9 [A-Z] Find any character from uppercase A to uppercase Z [a-z] Find any character from lowercase a to lowercase z [A-z] Find any character from uppercase A to lowercase z [adgk] Find any character in the given set [^adgk] Find any character outside the given set
OUTPUT
6
OUTPUT
OUTPUT Banana,Orange,Apple,Mango splaying array elements by specifing array nam
Methods that generate HTML tags big() - String is displayed in large format. (big tags) document.write("This is BIG text".big()) Is the same as: This is BIG text Producing:
This is BIG text
Methods that generate HTML tags bold() - String is displayed in bold characters. (bold tags) document.write("This is BOLD text".bold()) Is the same as: This is BOLD text Producing: This is BOLD text