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- function spaceCard(str) {
- var ret = [];
- var i;
- var len;
- str = str.replace(/\s|\D+/gi, '');
- if( str.match(/^3[47]/) ) {
- // american express only
- var sec = 4;
- for(i = 0, len = str.length; i < len; i+= sec) {
- switch(i) {
- case 4:
- sec = 6;
- break;
- case 10:
- sec = 5;
- break;
- }
- ret.push(str.substr(i, sec))
- }
- } else {
- // group by four
- for(i = 0, len = str.length; i < len; i += 4) {
- ret.push(str.substr(i, 4))
- }
- }
- return ret.join(' ');
- }
- $('#card-number').on('keyup', function() {
- var $el = $(this);
- $el.val( spaceCard($el.val()) );
- });
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