Class HtmlService

HtmlService allows scripts to return HTML and other text content to a browser safely through sanitization.
Security measures are in place to prevent scripts from directly returning malicious content.
The service includes properties like SandboxMode and XFrameOptionsMode for controlling client-side script behavior and security.
Methods are available to create HtmlOutput objects from various sources, including strings, blobs, and files.
The service also provides methods for creating HtmlTemplate objects for dynamic content generation.

Service for returning HTML and other text content from a script.

Due to security considerations, scripts cannot directly return content to a browser. Instead, they must sanitize the HTML so that it cannot perform malicious actions. See the description of HtmlOutput for what limitations this implies on what can be returned.

Detailed documentation

`createHtmlOutput()`

Creates a new HtmlOutput object that can be returned from the script.

const output = HtmlService.createHtmlOutput();

Return

HtmlOutput — the new HtmlOutput object

`createHtmlOutput(blob)`

Creates a new HtmlOutput object from a BlobSource resource.

function createFromBlob(blob) {
  const output = HtmlService.createHtmlOutput(blob);
  return output;
}

Parameters

Name	Type	Description
`blob`	`BlobSource`	the object to get HTML out of

Return

HtmlOutput — the new HtmlOutput object

Throws

Error — if the blob doesn't contain HTML or the HTML is malformed

`createHtmlOutput(html)`

Creates a new HtmlOutput object that can be returned from the script.

const output = HtmlService.createHtmlOutput('<b>Hello world!</b>');

Parameters

Name	Type	Description
`html`	`String`	the content to serve

Return

HtmlOutput — the new HtmlOutput object

Throws

Error — if the html is malformed

`createHtmlOutputFromFile(filename)`

Creates a new HtmlOutput object from a file in the code editor.

const output = HtmlService.createHtmlOutputFromFile('myPage');

Parameters

Name	Type	Description
`filename`	`String`	the name of the file to use

Return

HtmlOutput — the new HtmlOutput object

Throws

Error — if the file wasn't found or the HTML in it is malformed

`createTemplate(blob)`

Creates a new HtmlTemplate object from a BlobSource resource.

function createFromBlob(blob) {
  const template = HtmlService.createTemplate(blob);
  const output = template.evaluate();
  return output;
}

Parameters

Name	Type	Description
`blob`	`BlobSource`	The object to get HTML out of.

Return

HtmlTemplate — the new HtmlTemplate object

Throws

Error — if the blob doesn't contain HTML

`createTemplate(html)`

Creates a new HtmlTemplate object that can be returned from the script.

const template = HtmlService.createTemplate(
    '<b>The time is &lt;?= new Date() ?&gt;</b>',
);

Parameters

Name	Type	Description
`html`	`String`	the content of the template

Return

HtmlTemplate — the new HtmlTemplate object

`createTemplateFromFile(filename)`

Creates a new HtmlTemplate object from a file in the code editor.

const template = HtmlService.createTemplateFromFile('myTemplate');

Parameters

Name	Type	Description
`filename`	`String`	the name of the file to use

Return

HtmlTemplate — the new HtmlTemplate object

Throws

Error — if the file wasn't found

`getUserAgent()`

Gets the user-agent string for the current browser. Returns null for most script executions if not used in a web app's doGet() or doPost() function.

Return

String — the user-agent string