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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script>
function getCaretPosition(obj) {
var result = 0;
if ('selectionStart' in obj) {
result = obj.selectionStart;
} else {
try{
var rng;
if (obj.tagName == "textarea") {
rng = event.srcElement.createTextRange();
rng.moveToPoint(event.x, event.y);
} else {
rng = document.selection.createRange();
}
rng.moveStart("character", -event.srcElement.value.length);
result = rng.text.length;
}catch (e){
throw new Error(10,"asdasdasd")
}
}
return result;
}
function setCaretPosition(tObj, sPos){
if(tObj && sPos !== undefined){
setTimeout(function(){
if(tObj.setSelectionRange){
tObj.setSelectionRange(sPos, sPos);
tObj.focus();
}else if(tObj.createTextRange){
var rng = tObj.createTextRange();
rng.move('character', sPos);
rng.select();
}
}, 0);
}
}
</script>
<script src="./usejQuery/jquery-1.8.2.js"></script>
<style type="text/css">
input{
width: 800px;
height: 25px;
}
</style>
</head>
<body>
<input id="card" type="text" value="">
<script>
function autoSplit(ele, size) {
var lastValue, posn, divisor, whiteRgx, splitRgx, isBackspace;
lastValue = ''
whiteRgx = /\s+/g;
splitRgx = new RegExp('(\\d{' + size + '})(?!$)', 'g');
divisor = size + 1;
$(ele).on('input propertychange', function (event) {
var pos, str, propertyName, length, newValue;
str = $(this).val();
propertyName = event.originalEvent.propertyName;
if (propertyName && propertyName !== 'value' || lastValue == str) {
return ;
}
pos = getCaretPosition(this);
str = str.replace(whiteRgx, '');
length = str.length;
newValue = str.replace(splitRgx, '$1 ');
if (newValue.length <= lastValue.length) {
if (pos % divisor === 0 && isBackspace) {
pos -= 1;
} else if (pos % divisor === size) {
newValue = newValue.split('');
if (!isBackspace) {
newValue.splice(pos + 1, 1);
} else {
newValue.splice(pos - 1, 1);
pos -= 1;
}
newValue = newValue.join('').replace(whiteRgx, '').replace(splitRgx, '$1 ');
}
} else if (pos % divisor === 0) {
pos += 1;
}
lastValue = newValue;
$(this).val(newValue);
setCaretPosition(this, pos);
});
$(ele).on('keydown', function (event) {
isBackspace = event.keyCode === 8;
});
}
autoSplit($('#card'), 4);
</script>
</body>
</html>
|
