TrustedTypePolicyFactory: isScript() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Note: This feature is available in Web Workers.
The isScript() method of the TrustedTypePolicyFactory interface returns true if it is passed a valid TrustedScript object.
Note:
The purpose of the functions isScript(), isHTML(), and isScriptURL() is to check if the object is a valid TrustedType object, created by a configured policy.
Syntax
isScript(value)
Parameters
value-
A
TrustedScriptobject.
Return value
A boolean that is true if the object is a valid TrustedScript object.
Examples
In the below example the constant url was created by a policy, and therefore isScriptURL() returns true. The second example is an attempt to fake an object, and the third is a string. Both of these will return false when passed to isScriptURL().
const myScript = policy.createScript("eval('2 + 2')");
console.log(trustedTypes.isScript(myScript)); // true;
const fake = Object.create(TrustedScript.prototype);
console.log(trustedTypes.isScript(fake)); // false
console.log(trustedTypes.isScript("eval('2 + 2')")); // false
Specifications
| Specification |
|---|
| Trusted Types # dom-trustedtypepolicyfactory-isscript |
Browser compatibility
BCD tables only load in the browser