# Javascript Instructions

Using the **js\_instructions** parameter, you can get the scraped site after performing various Javascript instructions.

Javascript instructions can only be applied with **JavaScript rendering enabled**.

### Javascript Instructions parameters

| Parameter | Details                                                                                       |
| --------- | --------------------------------------------------------------------------------------------- |
| action    | Choose between `click`, `scrollTo`, `focus`, `value` and `submit` (only for `FORM` elements). |
| selector  | The CSS selector.                                                                             |
| timeout   | Perform a timeout after each javascript instruction. Measured in `ms`.                        |

### Javascript Instructions examples

> **`GET https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D`**

**⇡ Input**

{% tabs %}
{% tab title="cURL" %}

```url
curl --request GET --url "https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D"
```

{% endtab %}

{% tab title="NodeJS" %}

```javascript
const http = require("https");

const options = {
  "method": "GET",
  "hostname": "scrape.shifter.io",
  "port": null,
  "path": "/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D",
  "headers": {}
};

const req = http.request(options, function (res) {
  const chunks = [];

  res.on("data", function (chunk) {
    chunks.push(chunk);
  });

  res.on("end", function () {
    const body = Buffer.concat(chunks);
    console.log(body.toString());
  });
});

req.end();
```

{% endtab %}

{% tab title="Python" %}

```python
import http.client

conn = http.client.HTTPSConnection("scrape.shifter.io")

conn.request("GET", "/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D")

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
```

{% endtab %}

{% tab title="PHP" %}

```php
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
```

{% endtab %}

{% tab title="Golang" %}

```go
package main

import (
	"fmt"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D"

	req, _ := http.NewRequest("GET", url, nil)

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

{% endtab %}

{% tab title="Java" %}

```java
HttpResponse<String> response = Unirest.get("https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D")
  .asString();
```

{% endtab %}

{% tab title=".NET" %}

```
var client = new RestClient("https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D");
var request = new RestRequest(Method.GET);
IRestResponse response = client.Execute(request);
```

{% endtab %}

{% tab title="Ruby" %}

```ruby
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://scrape.shifter.io/v1?api_key=api_key&url=https://example.com&js_instructions=%5B%7B%22action%22%3A%22scrollTo%22%2C%22selector%22%3A%22div.navFooterBackToTop%22%2C%22timeout%22%3A%205000%2C%20%22block%22%3A%20%22start%22%7D%5D")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Get.new(url)

response = http.request(request)
puts response.read_body
```

{% endtab %}
{% endtabs %}

**⇣ Output**

```
<!doctype html>
<html>
<head>
  <title>Example Domain</title>

  <meta charset="utf-8" />
  <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <style type="text/css">
  body {
    background-color: #f0f0f2;
    margin: 0;
    padding: 0;
    font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
     
  }
  div {
    width: 600px;
    margin: 5em auto;
    padding: 2em;
    background-color: #fdfdff;
    border-radius: 0.5em;
    box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
  }
  a:link, a:visited {
    color: #38488f;
    text-decoration: none;
  }
  @media (max-width: 700px) {
    div {
      margin: 0 auto;
      width: auto;
    }
  }
  </style>   
</head>

<body>
<div>
  <h1>Example Domain</h1>
  <p>This domain is for use in illustrative examples in documents. You may use this
  domain in literature without prior coordination or asking for permission.</p>
  <p><a href="https://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developers.shifter.io/scraping-api/web-scraping-api/javascript-instructions.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.