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...
<input type="text" name="leNom" ... onkeypress="return integerKeyPressed(event, true) />
...
 
<script>
//-----------------------------------------------------------------------------------------------
// Extraction du code clavier tapé
//-----------------------------------------------------------------------------------------------
function getKeyPressed(eventObj)
{
    var keyCode = document.all ? eventObj.keyCode : eventObj.which;
    return keyCode;
}
 
//-----------------------------------------------------------------------------------------------
// Caractères autorisés pour un champ entier (signé ou non)
//-----------------------------------------------------------------------------------------------
function integerKeysAllowed(eventObj, signed)
{
    /*
     * Caractères acceptés :
     *    [0,9]
     *    - (si signed == true)
     */
    var keyCode = getKeyPressed(eventObj);
    if ( keyCode >= 48 && keyCode <= 57 ) return true;
    if ( signed && keyCode == 45 ) return true;
    if ( keyCode < 32 ) return true;
    if ( eventObj.ctrlKey && (keyCode == 118 || keyCode == 120 || keyCode == 99) ) return true;
    return false;
}
</script> | 
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