How do I make a JavaScript to block the use of commas , within the field and at the same time also make an informed notification that only . is allowed and also verify that what the user entered is correct.
I do not have much JavaScript knowledge and I did not find much about it, the most I found was onKeyCode and had another that I forgot but did not get anything.
Example: Current weight: 70.80
You can bind an event to the element of input
Example:
document.querySelector('input').addEventListener('keypress', function(evt) {
if (evt.key == ',') {
evt.preventDefault()
alert('Tecla inválida');
}
});<input type="text"> document.querySelector('input') will return the element you want to link
addEventListener binds a callback to a given event, in the example the linked event is keypress
function(evt){ console.log(evt.key); } is callback , the action that will be performed when the event occurs.
You can call the preventDefault() method to prevent the default event action
There is a jQuery event that is called keyPress, by parameter you pass a function with an if if the comma key has been pressed, ie:
Ex:
$(document).keypress(function(e) {
if(e.which == 188) {
alert('You pressed a virgula!');
}
});
188 is a, from the keyboard. this site has the value of all: link
You can implement if you can not answer me here