How do you implement a simple two-way data binding in jQuery?
Something like knockoutJS, but in the simplest possible form.
Scenario - bind JSON object to table row (every field is td>input/>/td>).
Any suggestions?
My try - HTML
<!DOCTYPE html>
<html xmlns=http://www.w3.org/1999/xhtml>
<head>
<title>Data Binding</title>
</head>
<body>
<table id=content-table>
<thead>
</thead>
<tbody></tbody>
</table>
<button id=get-data>Get</button>
<button id=set-data>Set</button>
<script src=../js/vendor/jquery-1.9.1.js></script>
<script src=../js/vendor/jquery-migrate-1.1.1.js></script>
<script src=../js/vendor/watch.js></script>
<script src=../js/dataBinder.js></script>
</body>
</html>
JavaScript
var DataBinder = (function ($) {
var _$table = null,
_objectList = [],
_fieldList = [],
_objectListLength = -1,
_fieldListLength = -1;
/* AJAX call or smth. */
var _loadData = function () {
var fakeData = [{
name: 'John',
surname: 'Doe'
}, {
name: 'Foo',
surname: 'Bar'
}];
_objectList = $.map(fakeData, function (element, index) {
var elementObject = {
_dataBinderId: index,
element: element,
input: {}
};
watch(elementObject.element, function (property, action, newValue) {
_setValue.call(elementObject, property, newValue);
});
return elementObject;
});
_objectListLength = _objectList.length;
};
var _getFields = function () {
for (var i = 0; i < _objectListLength; i++) {
for (var field in _objectList[i].element) {
if (!!!~$.inArray(field, _fieldList)) {
_fieldList.push(field);
}
}
}
_fieldListLength = _fieldList.length;
};
var _setValue = function (field, value) {
this.input[field].val(value);
};
var _bindEvents = function () {
$('#get-data').on('click', function () {
alert(JSON.stringify(_getRowData()));
});
$('#set-data').on('click', function () {
_objectList[0].element.name = 'PIPA';
_objectList[1].element.surname = 'BLAAAAAAH';
});
_$table.on('keyup', 'input', function () {
var $this = $(this), field = $this.data('field'), source = $this.closest('tr').data('source');
source[field] = $this.val();
});
};
var _getRowData = function () {
var elements = [];
$.each(_objectList, function () {
elements.push(this.element);
});
return elements;
};
var _generateEditableElements = function () {
var rowList = [], headerRow = $('<tr>');
for (var k = 0; k < _fieldListLength; k++) {
headerRow.append($('<th>', {
text: _fieldList[k].toUpperCase()
}));
}
_$table.find('thead').append(headerRow);
for (var i = 0; i < _objectListLength; i++) {
var objectData = _objectList[i], currentRow = $('<tr>');
currentRow.data('source', objectData.element);
rowList.push(currentRow);
for (var j = 0; j < _fieldListLength; j++) {
var field = _fieldList[j], $inputElement = $('<input>', {
type: 'text',
value: objectData.element[field]
});
$inputElement.data('field', field);
objectData.input[field] = $inputElement;
currentRow.append($('<td>').append($inputElement));
}
}
_$table.find('tbody').append(rowList);
};
var init = function ($table) {
_$table = $table;
_loadData();
_getFields();
_generateEditableElements();
_bindEvents();
};
return {
init: init
};
})(jQuery);
DataBinder.init($(#content-table));
I've used amazing Watch.JS. How Does Watch.js Work?
Watch.js now uses Object.observe
Here is another example Easy Two-Way Data Binding in JavaScript.
And another question.
Native JavaScript Data-Binding.
