What is the method to enable both text and numbers in an input field while restricting special characters?

Question

What is the method to enable both text and numbers in an input field while restricting special characters?

Is it possible to allow both text and numbers but disallow special characters in this input field?

Currently, my code only allows numbers. How can I modify it to also allow text?

Is it possible to achieve this using JavaScript?

<form action=# name=f1 id=f1 onsubmit="return false">
<input type=text name=t1 id=t1 value="" size=25 style="width:300px;"
 onkeypress="if(this.value.match(/\D/)) this.value=this.value.replace(/\D/g,'')"
 onkeyup   ="if(this.value.match(/\D/)) this.value=this.value.replace(/\D/g,'')"
>
</form>

jquery css

Answer 1

Answer №1

To easily restrict input, simply include a pattern attribute:

<input pattern="^[a-zA-Z0-9\s]+$" type="text" />

Test it out here

The code above should work well in most browsers. If needed, you can use jQuery as a fallback solution:

$('input').keypress(function (e) {
    if (!/[a-zA-Z0-9\s]/.test(String.fromCharCode(e.which || e.keyCode))) {
        e.preventDefault();
    }
});

Give it a try here

Answer 2

To easily restrict input, simply include a pattern attribute:

<input pattern="^[a-zA-Z0-9\s]+$" type="text" />

Test it out here

The code above should work well in most browsers. If needed, you can use jQuery as a fallback solution:

$('input').keypress(function (e) {
    if (!/[a-zA-Z0-9\s]/.test(String.fromCharCode(e.which || e.keyCode))) {
        e.preventDefault();
    }
});

Give it a try here

Answer 3

Answer №2

Utilize jQuery library. It is also recommended to incorporate the whitespace character (\s) in your code.

$('#t1').on('keypress', function (event) {
    var regex = new RegExp("^[a-zA-Z0-9]+$");
    var key = String.fromCharCode(!event.charCode ? event.which : event.charCode);
    if (!regex.test(key)) {
       event.preventDefault();
       return false;
    }
});

Check out this JSFiddle demo

Answer 4

Utilize jQuery library. It is also recommended to incorporate the whitespace character (\s) in your code.

$('#t1').on('keypress', function (event) {
    var regex = new RegExp("^[a-zA-Z0-9]+$");
    var key = String.fromCharCode(!event.charCode ? event.which : event.charCode);
    if (!regex.test(key)) {
       event.preventDefault();
       return false;
    }
});

Check out this JSFiddle demo

What is the method to enable both text and numbers in an input field while restricting special characters?

Answer №1

Answer №2

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