allow only numeric

Question

hi we have a validation like allow only number and  as per functionality. and this has to work on click of save button only. used Number.isnan but its not validating the +1 kind of input since internally treating as number. help me on this

Gowtham Cp · Answer

Hi  To ensure the input only contains numbers and commas when clicking the Save button use a regular expression to validate the input. Here's how: document.getElementById('saveButton').addEventListener('click' function() { const input = document.getElementById('inputField').value.trim(); const isValid = /^[0-9]+$/.test(input); if (isValid) { console.log('Valid input:' input); // Proceed with save } else { console.log('Invalid input! Only numbers and commas are allowed.'); // Show error message } }); Hope it helps!

Prasad Raveendran · Answer

If you'd like to validate the input without using regular expressions you can take a more manual approach by checking each character in the input string to ensure it’s either a digit or a comma. Here’s how you can do this: Save document.getElementById(saveButton).addEventListener(click function () { const inputValue = document.getElementById(inputField).value; // Validate each character manually const isValid = validateInput(inputValue); const errorMessageElement = document.getElementById(errorMessage); if (!isValid) { errorMessageElement.textContent = Please enter only numbers and commas.; } else { errorMessageElement.textContent = ; // Clear error message // Continue with your save functionality here alert(Input is valid!); } }); function validateInput(input) { for (let i = 0; i = '0' && char

Murali P · Answer

Thanks a lot goutham for ur help... It saves my day