我重构了原始指令,使其使用 $parses 和 $formatters 而不是监听键盘事件。也不需要使用 $browser.defer
请参阅此处的工作演示http://jsfiddle.net/davidvotrubec/ebuqo6Lm/
var myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', function($scope) {
$scope.numericValue = 12345678;
});
//Written by David Votrubec from ST-Software.com
//Inspired by http://jsfiddle.net/KPeBD/2/
myApp.directive('sgNumberInput', ['$filter', '$locale', function ($filter, $locale) {
return {
require: 'ngModel',
restrict: "A",
link: function ($scope, element, attrs, ctrl) {
var fractionSize = parseInt(attrs['fractionSize']) || 0;
var numberFilter = $filter('number');
//format the view value
ctrl.$formatters.push(function (modelValue) {
var retVal = numberFilter(modelValue, fractionSize);
var isValid = isNaN(modelValue) == false;
ctrl.$setValidity(attrs.name, isValid);
return retVal;
});
//parse user's input
ctrl.$parsers.push(function (viewValue) {
var caretPosition = getCaretPosition(element[0]), nonNumericCount = countNonNumericChars(viewValue);
viewValue = viewValue || '';
//Replace all possible group separators
var trimmedValue = viewValue.trim().replace(/,/g, '').replace(/`/g, '').replace(/'/g, '').replace(/\u00a0/g, '').replace(/ /g, '');
//If numericValue contains more decimal places than is allowed by fractionSize, then numberFilter would round the value up
//Thus 123.109 would become 123.11
//We do not want that, therefore I strip the extra decimal numbers
var separator = $locale.NUMBER_FORMATS.DECIMAL_SEP;
var arr = trimmedValue.split(separator);
var decimalPlaces = arr[1];
if (decimalPlaces != null && decimalPlaces.length > fractionSize) {
//Trim extra decimal places
decimalPlaces = decimalPlaces.substring(0, fractionSize);
trimmedValue = arr[0] + separator + decimalPlaces;
}
var numericValue = parseFloat(trimmedValue);
var isEmpty = numericValue == null || viewValue.trim() === "";
var isRequired = attrs.required || false;
var isValid = true;
if (isEmpty && isRequired) {
isValid = false;
}
if (isEmpty == false && isNaN(numericValue)) {
isValid = false;
}
ctrl.$setValidity(attrs.name, isValid);
if (isNaN(numericValue) == false && isValid) {
var newViewValue = numberFilter(numericValue, fractionSize);
element.val(newViewValue);
var newNonNumbericCount = countNonNumericChars(newViewValue);
var diff = newNonNumbericCount - nonNumericCount;
var newCaretPosition = caretPosition + diff;
if (nonNumericCount == 0 && newCaretPosition > 0) {
newCaretPosition--;
}
setCaretPosition(element[0], newCaretPosition);
}
return isNaN(numericValue) == false ? numericValue : null;
});
} //end of link function
};
//#region helper methods
function getCaretPosition(inputField) {
// Initialize
var position = 0;
// IE Support
if (document.selection) {
inputField.focus();
// To get cursor position, get empty selection range
var emptySelection = document.selection.createRange();
// Move selection start to 0 position
emptySelection.moveStart('character', -inputField.value.length);
// The caret position is selection length
position = emptySelection.text.length;
}
else if (inputField.selectionStart || inputField.selectionStart == 0) {
position = inputField.selectionStart;
}
return position;
}
function setCaretPosition(inputElement, position) {
if (inputElement.createTextRange) {
var range = inputElement.createTextRange();
range.move('character', position);
range.select();
}
else {
if (inputElement.selectionStart) {
inputElement.focus();
inputElement.setSelectionRange(position, position);
}
else {
inputElement.focus();
}
}
}
function countNonNumericChars(value) {
return (value.match(/[^a-z0-9]/gi) || []).length;
}
//#endregion helper methods
}]);
Github 代码在这里 [ https://github.com/ST-Software/STAngular/blob/master/src/directives/SgNumberInput]