A String object represents any sequence of zero or more characters that are to be treated strictly as text (that is, no math operations are to be applied). A large library of methods is divided into two categories. One category surrounds a string with a pair of HTML tags for a variety of HTML character formatting. These methods are used primarily to assist statements that use document.write( ) to dynamically create content, but their functionality is now superceded by style sheets. The second, vital method category is the more traditional set of string parsing and manipulation methods that facilitate finding and copying characters and substrings, case changes, and conversion from string lists to JavaScript arrays.

This is a reference to the function that created the instance of a String objectthe native String( ) constructor function in browsers.

Provides a count of the number of characters in the string. String values dynamically change their lengths if new values are assigned to them or if other strings are concatenated.

This is a property of the static String object. Use the prototype property to assign new properties and methods to future instances of a String value created in the current document. See the Array.prototype property description for examples.

Returns a copy of the string embedded within an anchor (<a>) tag set. The value passed as a parameter is assigned to the name attribute of the tag.

Returns a copy of the string embedded within a <big> tag set.

Returns a copy of the string embedded within a <blink> tag set.

Returns a copy of the string embedded within a <b> tag set.

Returns a single character string of the character located at the zero-based index position passed as a parameter. Use this method instead of substring( ) when only one character from a known position is needed from a string.

Returns a number of the decimal Unicode value for the character located at the zero-based index position passed as a parameter. For common alphanumeric characters, the Unicode values are the same as ASCII values.

Returns a string that appends the parameter string to the current string object. The results of this method are the same as concatenating strings with the add (+) or add-by-value (+=) operators. Neither the method nor operators insert spaces between the two string components.

Returns a copy of the string embedded within a <tt> tag set.

Returns a copy of the string embedded within a font (<font>) tag set. The value passed as a parameter is assigned to the color attribute of the tag.

Returns a copy of the string embedded within a font (<font>) tag set. The value passed as a parameter is assigned to the size attribute of the tag.

This is a static method that returns a string of one or more characters with Unicode values that are passed as a comma-delimited list of parameters. For example, the expression:

String.fromCharCode(120, 121, 122)

Returns a zero-based integer of the position within the current string where the searchString parameter starts. Normally, the search starts with the first (index of zero) character, but you may have the search begin later in the string by specifying the optional second parameter, which is the index value of where the search should start. If there is no match, the returned value is -1. This is a backward-compatible quick way to find out if one string contains another: if the returned value is -1 then you know the searchString is not in the larger string. If the returned value is another number (the precise value doesn't matter), the searchString is in the larger string. For browsers that support regular expressions, the String object's search( ) method performs a similar function.

Returns a copy of the string embedded within an <i> tag set.

Returns a zero-based integer of the position within the current string object where the searchString parameter starts. This method works like the indexOf( ) method but begins all searches from the end of the string or some index position. Even though searching starts from the end of the string, the startPositionIndex parameter is based on the start of the string, as is the returned value. If there is no match, the returned value is -1.

Returns a copy of the string embedded within an anchor (<a>) tag set. The value passed as a parameter is assigned to the href attribute of the tag.

Returns a number indicating whether the current string sorts before, the same as, or after the parameter string, based on browser- and system-dependent string localization. If the current string sorts before the parameter string, the return value is a negative number; if they are the same, the return value is 0, if the current string sorts after the parameter string, the return value is a positive number.

Returns an array of strings within the current string that match the regular expression passed as a parameter. For example, if you pass a regular expression that specifies any five-digit number, the returned value of the match( ) method would be an array of all five-digit numbers (as strings) in the main string. Properties of the RegExp static object are influenced by this method's operation.

Returns the new string that results when matches of the regexpression parameter are replaced by the replaceString parameter. The original string is unharmed in the process, so you need to capture the returned value in a variable to preserve the changes.

Returns the zero-based indexed value of the first character in the current string that matches the pattern of the regexpression parameter. This method is similar to the indexOf( ) method, but the search is performed with a regular expression rather than a straight string.

Returns a substring of the current string. The substring is copied from the main string starting at the zero-based index count value of the character in the main string. If no second parameter is provided, the substring extends to the end of the main string. The optional second parameter can be another zero-based index value of where the substring should end. This value may also be a negative value, which counts from the end of the string toward the front.

Returns a copy of the string embedded within a <small> tag set.

Returns a new array object whose elements are segments of the current string. The current string is divided into array entries at each instance of the delimiter string specified as the first parameter of the method. The delimiter does not become part of the array. You do not have to declare the array prior to stuffing the results of the split( ) method. For example, if a string consists of a comma-delimited list of names, you can convert the list into an array as follows:

var listArray = stringList.split(",");

Returns a copy of the string embedded within a <strike> tag set.

Returns a copy of the string embedded within a <sub> tag set.

Returns a copy of an extract from the current string. The extract begins at the zero-based index position of the current string as specified by the first parameter of the method. If no other parameter is provided, the extract continues to the end of the main string. The second parameter can specify an integer of the number of characters to be extracted from the main string. In contrast, the substring( ) method's parameters point to the start and end position index values of the main string.

Returns a copy of an extract from the current string. The extract begins at the zero-based index position of the current string as specified by the first parameter of the method and ends just before the character whose index is specified by the second parameter. For example, "Frobnitz".substring(0,4) returns the substring from positions 0 through 3: Frob. In contrast, the substr( ) method's parameters point to the start position of the main string and the number of characters (length) to extract.

Returns a copy of the string embedded within a <sup> tag set.

Return a copy of the current string in all lowercase or uppercase letters. Works the same as the regular version, except for some non-Latin alphabets with character mappings that may require special internal handling.

Return a copy of the current string in all lowercase or uppercase letters. If you want to replace the current string with a case-adjusted version, assign the result of the method to the same string:

myString = myString.toUpperCase( );

Return a string value of the object.