Disable Text Entry in | 易学教程

问题

I am making a simple web app. At one part of it, I have included an input box of type="number"

<input type="number" min="0">

Anyhow, when I run the code in my latest Google Chrome Browser, I am able to enter text too:

I do not want users to be able to do that. How should I rectify this?

回答1:

You can use JavaScript (e.g. with jQuery) to allow only specific characters:

// Catch all events related to changes
$('#textbox').on('change keyup', function() {
  // Remove invalid characters
  var sanitized = $(this).val().replace(/[^0-9]/g, '');
  // Update value
  $(this).val(sanitized);
});

Here is a fiddle.

Same thing with support for floats:

// Catch all events related to changes
$('#textbox').on('change keyup', function() {
  // Remove invalid characters
  var sanitized = $(this).val().replace(/[^0-9.]/g, '');
  // Remove the first point if there is more than one
  sanitized = sanitized.replace(/\.(?=.*\.)/, '');
  // Update value
  $(this).val(sanitized);
});

And here is another fiddle.

Update: Although you might not need this, here is a solution that allows a leading minus sign.

// Catch all events related to changes
$('#textbox').on('change keyup', function() {
  // Remove invalid characters
  var sanitized = $(this).val().replace(/[^-0-9]/g, '');
  // Remove non-leading minus signs
  sanitized = sanitized.replace(/(.)-+/g, '$1');
  // Update value
  $(this).val(sanitized);
});

3rd fiddle

And now a final solution that allows only valid decimals (including floats and negative numbers):

// Catch all events related to changes
$('#textbox').on('change keyup', function() {
  // Remove invalid characters
  var sanitized = $(this).val().replace(/[^-.0-9]/g, '');
  // Remove non-leading minus signs
  sanitized = sanitized.replace(/(.)-+/g, '$1');
  // Remove the first point if there is more than one
  sanitized = sanitized.replace(/\.(?=.*\.)/g, '');
  // Update value
  $(this).val(sanitized);
});

Final fiddle

回答2:

You can use HTML5 input type number to restrict only number entries:

<input type="number" name="someid" />

This will work only in HTML5 complaint browser. Make sure your html document's doctype is:

<!DOCTYPE html>

For general purpose, you can have JS validation as below:

function isNumberKey(evt){
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
}

<input type="someid" name="number" onkeypress="return isNumberKey(event)"/>

If you want to allow decimals replace the "if condition" with this:

if (charCode > 31 && (charCode != 46 &&(charCode < 48 || charCode > 57)))

Source: HTML Text Input allow only Numeric input

来源：https://stackoverflow.com/questions/21215049/disable-text-entry-in-input-type-number

标签

html

validation

user-input

Disable Text Entry in <input type=“number”>

问题

回答1:

回答2: