URLSearchParams: has() method
Baseline Widely available *
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
* Some parts of this feature may have varying levels of support.
Note: This feature is available in Web 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
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.
Specifications
| Specification |
|---|
| URL # dom-urlsearchparams-has |