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html javascript input numbers only

<input type="text" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(..*?)..*/g, '$1');" />
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type numeric value only in textbox javascript

function isNumber(evt) {
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        return false;
    }
    return true;
}
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type numeric value only in textbox javascript

<input type="text" class="textfield" value="" id="extra7" name="extra7" onkeypress="return isNumber(event)" />
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