The problem I have is that I need to validate a text field so that it only accepts ";" and "_" . So far it does not work for me with the code I have.
Code:
function doNotSubmitFormOnEnterPress(event) {
if (event.keyCode === 188 ) {
return false;
}
return true;
}
You can do this with Jquery , You can validate if the Shift key is pressed, with the property shiftKey , will return a value boolean if the key is pressed or not
$('#valor').keydown(function(e) {
if(e.shiftKey && e.keyCode ===188|| e.shiftKey && e.keyCode ===189)
return true;
if (e.key.length == 1)
return false
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="valor" > I suggest using keypress instead of keyDown so it does not limit the activation of the ctrl keys, such as: Backspace , Delete , Etc. Although I lean towards the use of jQuery as well, I show in its place and for illustrative purposes the use of addEventListener () to handle the onKeyPress event associated with <input> , as well as the use of event.preventDefault () , to prevent the normal flow of <input> in case of not typing the required values.
Example:
document.getElementById("name").addEventListener("keypress", doNotSubmitFormOnEnterPress);
function doNotSubmitFormOnEnterPress(event) {
if(";_".indexOf(event.key) == -1){ // colocar la cadena de caracteres permitidos
event.preventDefault();
};
};<input id="name">