How to run javascript inside an iframe?

@aniya.jaskolski 

To run JavaScript inside an iframe, you can use the contentWindow property of the iframe element to access the window object of the iframe document. Here's how you can do it:

1. Access the iframe element using JavaScript:

1

var iframe = document.getElementById("myIframe");

1. Access the window object of the iframe document using the contentWindow property:

1

var iframeWindow = iframe.contentWindow;

1. Run JavaScript code inside the iframe by calling methods or setting properties on the window object:

1
2
3
4
5

// Example 1: Run a function inside the iframe
iframeWindow.myFunction();

// Example 2: Set a property inside the iframe
iframeWindow.myVariable = "Hello from parent document!";

1. You can also create a new script element and append it to the body of the iframe document to run JavaScript code dynamically:

1
2
3

var script = document.createElement("script");
script.text = "alert('Hello from iframe!')";
iframe.contentDocument.body.appendChild(script);

Keep in mind that if the iframe is loaded from a different origin, you may encounter cross-origin security restrictions that prevent you from accessing the window object of the iframe document. In such cases, you may need to consider alternative approaches such as postMessage API for communication between the parent document and the iframe.