web api instance method
URLSearchParams: has() method
Available in workers
The has() method of the URLSearchParams interface returns a boolean value that indicates whether the specified parameter is in the search parameters.
A parameter name and optional value are used to match parameters.
If only a parameter name is specified, then the method will return true if any parameters in the query string match the name, and false otherwise.
If both a parameter name and value are specified, then the method will return true if a parameter matches both the name and value.
Syntax
has(name)
has(name, value)
Parameters
name- : The name of the parameter to match.
value- : The value of the parameter, along with the given name, to match.
Return value
A boolean value.
Examples
Check for parameter with specified name
This example shows how to check if the query string has any parameters with a particular name.
const url = new URL("https://example.com?foo=1&bar=2&foo=3");
const params = new URLSearchParams(url.search);
// has() returns true if the parameter is in the query string
console.log(`bar?:\t${params.has("bar")}`);
console.log(`bark?:\t${params.has("bark")}`);
console.log(`foo?:\t${params.has("foo")}`);
The log below shows whether the parameters bar, bark, and foo, are present in the query string.
bar?: true
bark?: false
foo?: true
Check for parameter with specified name and value
This example shows how to check whether the query string has a parameter that matches both a particular name and value.
const url = new URL("https://example.com?foo=1&bar=2&foo=3");
const params = new URLSearchParams(url.search);
// has() returns true if a parameter with the matching name and value is in the query string
console.log(`bar=1?:\t${params.has("bar", "1")}`);
console.log(`bar=2?:\t${params.has("bar", "2")}`);
console.log(`foo=4?:\t${params.has("foo", "4")}`);
Only the second value above should be true, as only the parameter name bar with value 2 is matched.
bar=1?: false
bar=2?: true
foo=4?: false
If your browser does not support the value option the method will match on the name, and all the results should be true.