Synta圎rror: a declaration in the head of a for-of loop can't have an initializer.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: Malformed formal parameter.Synta圎rror: "x" is a reserved identifier.Synta圎rror: "use strict" not allowed in function with non-simple parameters. ![]() Synta圎rror: "0"-prefixed octal literals and octal escape seq.ReferenceError: reference to undefined property "x".ReferenceError: invalid assignment left-hand side.ReferenceError: deprecated caller or arguments usage.ReferenceError: can't access lexical declaration`X' before initialization.ReferenceError: assignment to undeclared variable "x".RangeError: repeat count must be non-negative.RangeError: repeat count must be less than infinity.RangeError: argument is not a valid code point.Error: Permission denied to access property "x". ![]() Note that an URIError will be thrown if one attempts to encode a surrogate which is not part of a high-low pair, e.g.,Īlso note that if one wishes to follow the more recent RFC3986 for URLs, which makes square brackets reserved (for IPv6) and thus not encoded when forming something which could be part of a URL (such as a host), the following code snippet may help:ĮCMAScript 5.1 (ECMA-262) The definition of 'encodeURI' in that specification.ĮCMAScript 2015 (6th Edition, ECMA-262) The definition of 'encodeURI' in that specification.ĮCMAScript Latest Draft (ECMA-262) The definition of 'encodeURI' in that specification. encodeURIComponent, however, does encode these characters. Note that encodeURI by itself cannot form proper HTTP GET and POST requests, such as for XMLHTTPRequests, because "&", "+", and "=" are not encoded, which are treated as special characters in GET and POST requests. ! ~ * ' ( ) #ĮncodeURI differs from encodeURIComponent as follows: (See RFC2396)ĮncodeURI escapes all characters except: Not Escaped:Ī-Z a-z 0-9, / ? : & = + $ - _. Note how certain characters are used to signify special meaning: encodeURI does not encode characters that are necessary to formulate a complete URI. Also, encodeURI does not encode a few additional characters, known as "unreserved marks", which do not have a reserved purpose but are allowed in a URI "as is". The following example shows all the parts that a URI "scheme" can possibly contain. Descriptionĭoes not encode characters that have special meaning (reserved characters) for a URI. Return valueĪ new string representing the provided string encoded as a Uniform Resource Identifier (URI). Syntax encodeURI( URI) Parameters URI A complete Uniform Resource Identifier. If you'd like to contribute to the interactive examples project, please clone and send us a pull request. In the second call we have a few quotation marks, which are not valid, and therefore encoded.The source for this interactive example is stored in a GitHub repository. This is because all characters are valid in a URL. Notice how there were no changes made to the URL in the first call above. > encodeURI( ' :443/my/file.html?stack="abuse"#javascript') ![]() ' :443/my/file.html?stack=abuse#javascript' The URL passed to encodeURI can contain any valid part of a URL scheme and not be escaped, while other reserved or disallowed characters are encoded: > encodeURI( ' :443/my/file.html?stack=abuse#javascript') This is because it expects to receive a full URL as input, unlike the encodeURIComponent variation of this function. The encodeURI function is perfect for this because it doesn't escape any other reserved characters, like the colon or forward slash. Notice how the space has been replaced with the percent-encoding, %20. That's where encodeURI comes in: > let query = 'web development' So what do we do if the user enters the string "web development", for example? We can't allow just any character in our URL. In a use-case like this, it's pretty likely that the user will enter a string containing a space (or other reserved character), which isn't allowed in URLs. In terms of use-cases, let's say your website has a search bar and the queries entered there are used to construct a URL like this:
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