React warns about Invalid DOM property for
htmlForTo fix the React.js warning "Invalid DOM property for. Did you mean htmlFor", you need to use the attribute instead of the tag for. The attribute is used htmlForbecause foris a reserved word in JavaScript.
Below is an example that produces the above warning.
export default function App() {
// ⛔️ Warning: Invalid DOM property `for`. Did you mean `htmlFor`?
return (
<div>
<label for="firstName">First Name</label>
<input id="firstName" type="text" />
</div>
);
}
The problem in the code example is that we use forthe attribute to match the label tag to the input , but foris a reserved word in JavaScript.
To eliminate the warning, we must use htmlForinstead of for. As shown in the following code
export default function App() {
return (
<div>
<label htmlFor="firstName">First Name</label>
<input id="firstName" type="text" />
</div>
);
}
htmlForforProperties are not specific to React.js, they are also used in browsers to set properties programmatically .
If we have some accessibility linting rules, we might have to wrap our input tag with our label.
export default function App() {
return (
<div>
<label htmlFor="firstName">
First Name
<input id="firstName" type="text" />
</label>
</div>
);
}
The reason we have to use in React htmlForis because forthe keyword is a reserved word - it is used for the for loop.
This is why classNameproperty is used instead of class. classThis word is reserved because it is used to declare an ES6 class.
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