Using the following code with jQuery:

$('#from-amount').keypress(function(event) {
    if ((event.which != 46 || $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57)) {
        event.preventDefault();
    }
});

It does work, but i can use . at the start and paste (with the mouse and keyboard CMD+V) any string. How can i prevent . at the start and disable paste with keyboard and mouse?

Using the following code with jQuery:

$('#from-amount').keypress(function(event) {
    if ((event.which != 46 || $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57)) {
        event.preventDefault();
    }
});

It does work, but i can use . at the start and paste (with the mouse and keyboard CMD+V) any string. How can i prevent . at the start and disable paste with keyboard and mouse?

• javascript
• jquery

Share Improve this question Follow asked Dec 14, 2016 at 17:41 Alexander KimAlexander Kim 18.4k2424 gold badges107107 silver badges165165 bronze badges 10

• You have JQuery available, right? Why you don't use Jquery maskedinput? you can use any pattern you want. – MarceloBarbosa Commented Dec 14, 2016 at 17:44
• @MarceloBarbosa because it's a different thing for a different task. I don't need a mask, i just won't allow user to type incorrect data. – Alexander Kim Commented Dec 14, 2016 at 17:46
• could you please provide an example of the value you want? – MarceloBarbosa Commented Dec 14, 2016 at 17:47
• Have you tried using regex on the value of the input? – MCMXCII Commented Dec 14, 2016 at 17:47
• @MarceloBarbosa, here's an example: en.utbs.ws in the field You give you got an input where do you put only numeric data and decimals. – Alexander Kim Commented Dec 14, 2016 at 17:49

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1 Answer 1

Sorted by: Reset to default 12

Try this

$('#from-amount').keypress(function(event) {
    if (((event.which != 46 || (event.which == 46 && $(this).val() == '')) ||
            $(this).val().indexOf('.') != -1) && (event.which < 48 || event.which > 57)) {
        event.preventDefault();
    }
}).on('paste', function(event) {
    event.preventDefault();
});

https://jsfiddle/4rsv960t/1/