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jab.js
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jab.js
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(function(){
/* helpers */
function isString(s) {
return (typeof s == 'string');
}
function isObj(o) {
return (typeof o == 'object');
}
function isArray(a) {
return a.constructor === Array;
}
function getAttributesNames(domElem) {
return Array.prototype.slice.call(domElem.attributes).map(function(item) { return item.name });
}
function toArray(itemOrArray) { //
itemOrArray = itemOrArray || [];
if (isArray(itemOrArray)) return itemOrArray;
if (itemOrArray.constructor === HTMLCollection) return Array.prototype.slice.call(itemOrArray);
if (itemOrArray.constructor === NodeList) return Array.prototype.slice.call(itemOrArray);
return [itemOrArray];
}
var toArr = toArray;
function addListenerMulti(element, eventsString, func) {
var events = eventsString.split(' ');
events.forEach(function(event) { element.addEventListener(event, func, false); });
}
function toDomElems(selectorOrElem) {
if (isString(selectorOrElem)) return toArray(document.querySelectorAll(selectorOrElem));
return selectorOrElem;
}
function descendants(elem) {
var res = toArr(elem.querySelectorAll("*"))
res.push(elem);
return res;
}
/* DOM manipulation */
//return the property to access DOM element's value - 'value', 'innerHTML', 'selectedIndex', etc.
function getDomValueProp(elem) {
if (elem.type == 'checkbox') return 'checked';
if (elem.nodeName == 'INPUT') return 'value';
if (elem.nodeName == 'TEXTAREA') return 'value';
if (elem.nodeName == 'SELECT') return 'selectedIndex';
return 'textContent'; //default
}
function getDomValue(elem) {
var propName = getDomValueProp(elem);
return elem[propName];
}
function setDomValue(elem, newValue) {
var propName = getDomValueProp(elem);
elem[propName] = newValue;
}
function syncDomElemsOnChange(obj, property, domElems) {
var events = 'change keyup';
domElems.forEach(function(elem) {
addListenerMulti(elem, events, function(e) {
obj[property] = getDomValue(e.srcElement);
});
});
}
function modifyElems(domElems, newValue, opts) {
if (domElems.length==0) { console.log("noop"); return; }
var modifyingFunc = getModifyingFunc(opts)
domElems.forEach(function(domElem) {
modifyingFunc(domElem, newValue);
});
}
function getModifyingFunc(opts) {
var opts = opts || {};
if (isString(opts)) opts = {func: opts}; //treat input of 'foo' as {func: 'foo'}
if (opts.func) {
if ((opts.func.constructor) == Function) return opts.func;
switch(opts.func) {
case 'show': return show;
case 'bgcolor': return bgcolor;
case 'disable': return disable;
case 'enter': return enter;
}
}
return setDomValue; //default
}
/*custom bindings */
function show(elem, value) {
value ? elem.style.visibility = null : elem.style.visibility = 'hidden';
}
function bgcolor(elem, value) {
elem.style.backgroundColor = value;
}
function disable(elem, value) {
value ? elem.disabled = true : elem.disabled = false;
}
function enter(elem, cb) { //should be refactored into a markupBinding
if (elem.listenEnter) return;
elem.listenEnter = true;
elem.addEventListener("keyup", function (e) {
if (e.keyCode === 13) { //checks whether the pressed key is "Enter"
var value = elem.value;
cb(value);
elem.value = ""; //clean
}
});
}
/* JabJS logic */
function markBindings(obj, property, domElems, opts) {
var opts = opts || {};
obj.jab = obj.jab || {};
obj.jab.bindings = obj.bindings || {};
obj.jab.bindings[property] = {elems: domElems, func: opts.func, opts: opts};
}
function bindModelToElem(obj, property, domElems, opts) {
var domElems = toArray(toDomElems(domElems)); //ensure DOM elems array
var currentValue = obj[property] || '';
var opts = opts || {};
if (isArray(obj[property])) {
var _arr = obj[property];
var originalDOMNode = domElems[0];
originalDOMNode.originalParent = originalDOMNode.parentElement;
Object.defineProperty(obj, property, {
get: function() {
return _arr; },
set: function(newValue) {
_arr = newValue;
bindArr(_arr, originalDOMNode);
return _arr; }
});
obj[property] = _arr; //trigger to start
return _arr;
}
//not array, simple values
Object.defineProperty(obj, property, {
get: function() { return getDomValue(domElems[0]); }, //necessary in case DOM elem is externally modified
set: function(newValue) {
modifyElems(domElems, newValue, opts);
if (opts.afterHook)(opts.afterHook)(newValue); //opts.afterHook is a function. If present, it executes on 'newValue'.
},
configurable: true
});
syncDomElemsOnChange(obj, property, domElems);
markBindings(obj, property, domElems, opts);
obj[property] = currentValue; //force assignment to trigger binding with the initial data
return obj;
}
function bindVarCore(obj, property, cb) {
var val = obj[property];
Object.defineProperty(obj, property, {
get: function() { return val; },
set: function(newValue){ val = newValue; cb(newValue); },
configurable: true
});
obj[property] = obj[property]; //force to trigger binding
}
function bindVar(obj, propsList, cb) {
var propsList = toArray(propsList);
propsList.forEach(function(property) { bindVarCore(obj, property, cb) });
}
function bindMarkupCallbacks(obj, elems) {
elems.forEach(function (elem) {
var attributes = getAttributesNames(elem);
attributes.forEach(function(attr) {
if (attr.indexOf('jab-') == 0) { //starts with jab-
var cbType = attr.substring('jab-'.length); //part after jab-. E.g. "click"
var eventName = 'on'+cbType;
var cbName = elem.getAttribute(attr);
elem[eventName] = function() {
if (obj[cbName]) obj[cbName](elem);
else { //immediate, literal callbacks
var parts = cbName.split('-');
if (parts[0] == 'addClass') elem.classList.add(parts[1]);
if (parts[1] == 'removeClass') elem.classList.removeClass(parts[1])
}
}
}
});
});
}
//bind all properties of all descendants of one element, by 'name' (or other) attribute)
function bindObj(obj, elemOrSelector, domAttrForObjKey) {
var elem = toArray(toDomElems(elemOrSelector))[0];
var domAttr = domAttrForObjKey || 'name'; //this attr holds the key for the obj's prop to bind with.
var elems = descendants(elem);
if (!elems.length) {
elems = [elem];
}//if no children, bind to himself.
//map which elems are binded to which object keys
var objKeysMap = elems.reduce(function(totalVal, curElem) {
var key = curElem.getAttribute(domAttr); //object key to bind to object
if(key) { totalVal[key] = totalVal[key] || []; totalVal[key].push(curElem); }
return totalVal;
}, {});
for (key in objKeysMap) {
var bindedElems = objKeysMap[key];
if (obj.hasOwnProperty(key)) bindModelToElem(obj, key, bindedElems);
}
bindMarkupCallbacks(obj, elems);
return obj;
}
function clearElem(node) { //clears elem's contents. (like .innerHTML = '');
try {
node.innerHTML = ''; //alternative: while (node.firstChild) { node.removeChild(node.firstChild); }
} catch (e) {
var temp = node;
throw e;
}
}
var arrayChangingFuncs = ["pop", "push", "reverse", "shift", "unshift", "splice", "sort", "filter"];
function setArrOnChangesCB(arr, cb) {
arrayChangingFuncs.forEach(function(funcName){
var func = arr[funcName];
arr[funcName] = function() {
var res = func.apply(this, arguments);
cb(arr);
return res;
}
});
cb(arr); //trigger to start it off
}
function bindArr(arr, elem, domAttr) {
//var orig = elem;
var elem = toArray(toDomElems(elem))[0];
var papa = elem.parentElement || elem.originalParent;
//whenever array changes, we want to...
var repeatElementByArr = function(newArr) {
clearElem(papa);
newArr.forEach( function(item, index) {
if (isObj(item)) { //we can't bind primitives.
var newNode = papa.appendChild(elem.cloneNode(true));
jab.bindObj(item, newNode, domAttr);
}
});
elem.parentElement = papa; //keep this for later
};
//when arr changes, repeatElementByArr
setArrOnChangesCB(arr, repeatElementByArr);
//enable refreshing
arr.updateBindings = function() {
repeatElementByArr(arr);
}
//enable accessing by index,
arr.set = function(index, obj) {
arr[index] = obj;
arr.updateBindings();
}
}
window.jab = {
bind: bindModelToElem,
bindVar: bindVar,
bindObj: bindObj,
bindArr: bindArr
};
console && console.log("loaded JabJS");
}());