Created
June 18, 2014 13:06
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Micro Two-way Data Binding
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<!DOCTYPE html> | |
<html> | |
<head> | |
<script src="http://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.min.js"></script> | |
<meta charset="utf-8"> | |
<title>JS Bin</title> | |
</head> | |
<body> | |
<div data-component="input"> | |
<template> | |
<input type="text" name="username" tb-model="username" value="" /> | |
<span>{{ username }}</span> | |
</template> | |
</div> | |
<script> | |
var DIRECTIVE_ATTR_MODEL = 'tb-model', | |
regMustache = /\{\{\s*(\w+)\s*\}\}/g, | |
slice = Array.prototype.slice; | |
function boot() { | |
var components = slice.call(document.querySelectorAll('[data-component]'), 0); | |
components.forEach(function (el) { | |
var component = el.getAttribute('data-component'); | |
bootComponent(el, window[component + 'Controller']); | |
}); | |
} | |
function bootComponent(el, controller) { | |
var $scope = {}, | |
elFrag = el.querySelector('template').content.cloneNode(true); | |
traverse(elFrag, $scope); | |
el.appendChild(elFrag); | |
controller($scope); | |
} | |
function traverse(root, $scope) { | |
for (var el = root.firstChild; el; el = el.nextSibling) { | |
parseElement(el, $scope); | |
if (el) { | |
traverse(el, $scope); | |
} | |
} | |
} | |
function parseElement(el, $scope) { | |
if (el.nodeType === 1) { | |
// element | |
if (el.hasAttribute(DIRECTIVE_ATTR_MODEL)) { | |
var model = el.getAttribute(DIRECTIVE_ATTR_MODEL); | |
el.removeAttribute(DIRECTIVE_ATTR_MODEL); | |
el.addEventListener('input', function () { | |
$scope[model] = this.value; | |
}); | |
} | |
} else if (el.nodeType === 3) { | |
// text node | |
var text = el.textContent, | |
tpl = [], | |
lastIndex = 0, | |
match = regMustache.exec(text); | |
while (match) { | |
tpl.push(text.substring(lastIndex, regMustache.lastIndex - match[0].length)); | |
tpl.push({ | |
type: 'var', | |
content: match[1] | |
}); | |
lastIndex = regMustache.lastIndex; | |
match = regMustache.exec(text); | |
} | |
watch($scope, function () { | |
text = ''; | |
tpl.forEach(function (item) { | |
text += typeof item === 'string' ? item : $scope[item.content]; | |
}); | |
el.textContent = text; | |
}); | |
} | |
} | |
function watch($scope, cb) { | |
var old = _.cloneDeep($scope), | |
timer; | |
timer = setInterval(function () { | |
if (!_.isEqual($scope, old)) { | |
cb($scope, old); | |
old = _.cloneDeep($scope); | |
} | |
}, 50); | |
} | |
function inputController($scope) { | |
$scope.username = 'spring'; | |
} | |
boot(); | |
</script> | |
</body> | |
</html> |
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