For a training, I'am trying to check if the input value of this code base includes a "@" when onBlur:
<form>
<input
type='text'
name='my_input'
value={inputValue}
onChange={(e) => setInputValue(e.target.value)}
onBlur={(e) => checkEmail(e.target.value)}
></input>
<button>Save</button>
</form>
Therefore I added a function to display a <div> below the form (or at least below the input field) if there is no "@" in the input, but without success: ๐ง
function checkEmail(value) {
if (!value.includes('@')) {
<div>โ ๏ธ Warning, there is no @, this is not a valid email address.</div>;
}
}
Knowing console.log(!value.includes('@')) well return true. ๐ซ
Any clue on how to get the <div>โ ๏ธ Warning, there is no @, this is not a valid email address.</div> shown below the form or input when invalid input?
Thanks in advance. ๐
You are returning your JSX in the checkEmail function, which isn't quite right. What you want to do instead is have a flag that indicates whether the warning JSX should be rendered, and setup a logic to do so if it is true. inputValue being a state is really handy in this case, one small && operator should handle the rendering function.
<form> ... </form>
{ inputValue && !inputValue.includes('@') &&
(<div>โ ๏ธ Warning, there is no @, this is not a valid email address.</div>) }
PS:
you can get rid of onBlur={(e) => checkEmail(e.target.value)} and its handler method.