event: "Deprecated symbol used, consult docs for better alternative"

javascript html pycharm dom-events event-listener

20,068

I do not know if it is still important for someone or not, but tested on WebStorm 2020.3 the following works, and the IDE does not complain about deprecation. Additionally, WebStorm identifies the event as Event.

Code snippet below.

(function() {
    const checkBox = document.querySelector("#id-checkbox");
    checkBox.addEventListener('click', (event) => {
        event.preventDefault();
    }, false);
})();

<head>
    <script src="click.js" defer></script>
</head>
<body>
    <p>Please click on the checkbox control.</p>
    <form>
        <label for="id-checkbox">Checkbox:</label>
        <input type="checkbox" id="id-checkbox"/>
    </form>

    <div id="output-box"></div>
</body>

20,068

Author by

mistiru

Updated on November 11, 2021

Comments

mistiru over 2 years
It's been a while that PyCharm (I suppose it's the same with WebStorm and other JetBrains IDEs) raise a weak warning on the event variables I use in my code.

For instance in the following code
```
<div id="my-div" onclick="event.preventDefault();">...</div>
```
PyCharm displays this message "Deprecated symbol used, consult docs for better alternative".

The problem seems to be that the event variable refers to Window.event, and according to MDN Web Docs:

You should avoid using this property in new code, and should instead use the Event passed into the event handler function. This property is not universally supported and even when supported introduces potential fragility to your code.

I know that a correct workaround would be to write in a javascript tag:
```
document.getElementById("my-div").addEventListener("click", function(event) {
  console.log("And use this " + event + " instead");
});
```
I am just wondering what would be, if it exists, the correct way to use events in the HTML code (onclick attribute).
Itamar over 3 years

If it helped you, please mark it as answer for future visitors
G. Marc over 3 years

This is not a solution at all. Pycharm still complains about the usage of "event" in the attribute.
Itamar over 3 years

Dear Mark, Can you attach your error in PyCharm? This is the solution for the asked question
chrisan over 3 years

@Itamar the error is the same Deprecated symbol used, consult docs for better alternative and appears for both of your examples in the most recent version available by Jetbrains at the time of this comment
Itamar over 3 years

I do think that there might be a different reason for that. i suggest you to ask your own question with all the needed info
Itamar over 3 years

Sure. Cause it's not the problem the op has