What is the proper way to activate the oninput event once a string has been inserted into a text box

Question

What is the proper way to activate the oninput event once a string has been inserted into a text box

I am trying to insert a string into a textbox using the JavaScript code below:

document.querySelector('textarea').value = '0a06282c0241057a10011805220d080510bea3f493062a03010c1628f1a6f493063002382b4001481482010f383634333233303532343736343839';

1- In the first scenario: After running the above code, clicking on the submit button does not yield any result because the oninput event is not enabled.

Result 1 shows as empty and does not work:

https://i.sstatic.net/RdvlF.png

2- In the second scenario: After executing the code, adding one (or more) spaces to the textbox before clicking the submit button results in success because the oninput event gets activated.

https://i.sstatic.net/vnHnD.png

How can I activate the oninput event using JavaScript?

Note 1: I do not own the website and do not have access to backend code to change or find the oninput function for direct calling.

Note 2: I am running the JavaScript code in the browser console.

javascript oninput

Answer 1

Answer №1

When it comes to handling events, there are a few different paths you can take. One option is the more challenging route, which involves creating an InputEvent and sending it through the message pump.

const event = new InputEvent(...);
textarea.dispatchEvent(event);

However, a simpler approach might be to store a reference to the function tied to the event listener, and then directly execute that function when needed:

var inputHandler = function(...) {};
addEventListener("input", e => { inputHandler(/*event properties*/) });
...
// series of events triggering the text area's load
inputHandler(...);

The decision between these two methods may depend on factors such as limitations in accessing event registration or the input handler function itself.

Answer 2

When it comes to handling events, there are a few different paths you can take. One option is the more challenging route, which involves creating an InputEvent and sending it through the message pump.

const event = new InputEvent(...);
textarea.dispatchEvent(event);

However, a simpler approach might be to store a reference to the function tied to the event listener, and then directly execute that function when needed:

var inputHandler = function(...) {};
addEventListener("input", e => { inputHandler(/*event properties*/) });
...
// series of events triggering the text area's load
inputHandler(...);

The decision between these two methods may depend on factors such as limitations in accessing event registration or the input handler function itself.

What is the proper way to activate the oninput event once a string has been inserted into a text box

Answer №1

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