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// multifield - connects several input fields to each-other
// By Yair Even Or / 2011 / dropthebit.com
;(function(){
var fixedEvent = 0;
function funnel(e){
fixedEvent++;
var that = this;
setTimeout(function(){
keypress.call(that, e);
fixedEvent = 0;
},0);
}
function keypress(e){
var nextPrevField,
sel = [this.selectionStart, this.selectionEnd];
if( !e.charCode && e.keyCode != 37 && e.keyCode != 39 && e.keyCode != 8 )
return;
// if hit Backspace key when caret was at the beginning, or if the 'left' arrow key was pressed and the caret was at the start -> go back to previous field
if( (e.keyCode == 8 && sel[1] == 0) || (e.keyCode == 37 && sel[1] == 0) )
setCaret( $(this).prev(':text')[0], 100);
// if the 'right' arrow key was pressed and caret was at the end -> advance to the next field
else if( e.keyCode == 39 && sel[1] == this.value.length )
setCaret( $(this).next(':text')[0], 0);
// automatically move to the next field once user has filled the current one completely
else if( e.charCode && sel[1] == sel[0] && sel[0] == this.maxLength )
setCaret( $(this).next(':text')[0], 100);
function setCaret(input, pos){
if( !input ) return;
if (input.setSelectionRange){
input.focus();
input.setSelectionRange(pos, pos);
}
else if( input.createTextRange ){
var range = input.createTextRange();
range.collapse(true);
range.moveEnd('character', pos);
range.moveStart('character', pos);
range.select();
}
}
combine.apply(this);
};
// After each 'change' event of any of the fields, combine all the values to the hidden input.
function combine(){
var hidden = $(this).siblings('input[type=hidden]').val('')[0];
$(this.parentNode).find(':text').each( function(){
hidden.value += this.value;
});
}
$('div.multi').on({'keydown.multifeild':funnel, 'keypress.multifeild':funnel, 'change.multifeild':combine}, 'input');
})();