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knockout-table.js
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knockout-table.js
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// TABLE BINDING plugin for Knockout http://knockoutjs.com/
// (c) Michael Best
// License: MIT (http://www.opensource.org/licenses/mit-license.php)
// Version 0.2.2
//
// updated by edotassi - [email protected] https://github.com/edotassi/knockout-table
(function (ko, undefined) {
var div = document.createElement('div'),
elemTextProp = 'textContent' in div ? 'textContent' : 'innerText';
div = null;
function makeRangeIfNotArray(primary, secondary) {
if (primary === undefined && secondary)
primary = secondary.length;
return (typeof primary === 'number' && !isNaN(primary)) ? ko.utils.range(0, primary - 1) : primary;
}
function isArray(a) {
return a && typeof a === 'object' && typeof a.length === 'number';
}
function isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
function isString(s) {
return typeof s == "string";
}
function parseDate(d) {
return new Date(d);
}
/*
* HTML element helpers
*/
// verifica se un elemento contiene come classe 'className'
function hasClass(element, className) {
return className ? element.className.indexOf(className) > -1 : false;
}
// aggiunge una classe ad un elemento
function addClass(element, className) {
if (className) {
if (!hasClass(element, className)) {
element.className = element.className.trim() + ' ' + className;
}
}
}
// rimuove una classe da un elemento
function removeClass(element, className) {
if (className) {
var classes = className.split(' ');
for (var i = 0; i < classes.length; i++) {
if (hasClass(element, classes[i])) {
var reg = new RegExp('(\\s|^)' + classes[i] + '(\\s|$)');
element.className = element.className.replace(reg, ' ');
}
}
}
}
/*
* Table binding
*/
ko.bindingHandlers.search = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
}
};
ko.bindingHandlers.table = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var rawValue = ko.utils.unwrapObservable(valueAccessor());
var value = isArray(rawValue) ? { data: rawValue} : rawValue;
/* header data */
var header = ko.utils.unwrapObservable(value.header);
/* row class header */
var headerClass = ko.utils.unwrapObservable(value.headerClass);
/* class applied when a row is hidden */
var hideClass = ko.utils.unwrapObservable(value.hideClass);
/* observable related to the search text */
var searchText = value.searchText;
/* table data */
var data = value.data;
if (searchText) {
if (!ko.isObservable(searchText)) throw "searchText must be observable";
searchText.subscribe(function (newValue) {
var rows = element.lastChild.children;
var data = ko.utils.unwrapObservable(this.data);
for (var i = 0; i < rows.length; i++) {
var t = data[i].join(' ');
if (t.indexOf(newValue) > -1) {
removeClass(rows[i], this.hideClass);
} else {
addClass(rows[i], this.hideClass);
}
}
}, {
element: element,
data: data,
hideClass: hideClass
});
}
if (!header) return;
var enableSorting = (ko.utils.unwrapObservable(value.enableSorting) == undefined) ? true : ko.utils.unwrapObservable(value.enableSorting);
var thead = document.createElement('THEAD');
var tr = document.createElement('TR');
tr.className = headerClass;
thead.appendChild(tr);
var trHead = tr;
for (var i = 0; i < header.length; i++) {
var th = document.createElement('TH');
var span = document.createElement('SPAN');
span.innerText = header[i];
th.appendChild(document.createElement('SPAN'));
th.appendChild(span);
if (enableSorting) {
th.onclick = (function (index, valueAccessor) {
var index = index;
var desc = true;
var valueAccessor = valueAccessor;
return function order(event) {
var rawValue = ko.utils.unwrapObservable(valueAccessor());
/* class of an th element selected */
var selectedClass = rawValue.selectedClass;
/* class of an th element unselected */
var unselectedClass = rawValue.unselectedClass;
/* class of an icon up */
var upClass = rawValue.upClass;
/* class of an icon down */
var downClass = rawValue.downClass;
/* sort function, returns -1 if left <right, 0 if left == right, 1 if left> right */
var sortFunc = rawValue.sortFunc;
var ths = event.currentTarget.parentElement.children;
for (var i = 0; i < ths.length; i++) {
removeClass(ths[i], selectedClass);
removeClass(ths[i].firstChild, upClass + ' ' + downClass);
}
addClass(event.currentTarget, selectedClass);
addClass(event.currentTarget.firstChild, desc ? upClass : downClass);
rawValue.data.sort(function (left, right) {
if (sortFunc) {
return sortFunc(left, right, index, desc);
} else {
var leftValue = left[index];
var rightValue = right[index];
if (isNumber(leftValue) && isNumber(rightValue)) {
return desc ? (leftValue >= rightValue ? -1 : 1) : (leftValue <= rightValue ? -1 : 1);
} else {
if (isString(leftValue) && isString(rightValue)) {
return desc ? leftValue.localeCompare(rightValue) : rightValue.localeCompare(leftValue);
} else {
if (isNumber(leftValue) && isString(rightValue)) {
return desc ? (leftValue + '').localeCompare(rightValue) : rightValue.localeCompare(leftValue + '');
} else {
if (isString(leftValue) && isNumber(rightValue)) {
return desc ? (rightValue + '').localeCompare(leftValue) : leftValue.localeCompare(rightValue + '');
}
}
}
}
}
});
desc = !desc;
}
})(i, valueAccessor);
}
trHead.appendChild(th);
}
element.appendChild(thead);
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var rawValue = ko.utils.unwrapObservable(valueAccessor()),
value = isArray(rawValue) ? { data: rawValue } : rawValue,
data = ko.utils.unwrapObservable(value.data),
dataItem = ko.utils.unwrapObservable(value.dataItem),
/* header data */
header = ko.utils.unwrapObservable(value.header),
/* class applied to each row */
evenClass = ko.utils.unwrapObservable(value.evenClass),
/* class applied to the table */
tableClass = ko.utils.unwrapObservable(value.tableClass),
dataIsArray = isArray(data),
dataIsObject = typeof data === 'object',
dataItemIsFunction = typeof dataItem === 'function',
headerIsArray = isArray(header),
headerIsFunction = typeof header === 'function',
cols = makeRangeIfNotArray(ko.utils.unwrapObservable(value.columns), headerIsArray && header),
rows = makeRangeIfNotArray(ko.utils.unwrapObservable(value.rows), dataIsArray && data),
numCols = cols && cols.length,
numRows = rows && rows.length,
itemSubs = [], tableBody, rowIndex, colIndex;
// data must be set and be either a function or an array
if (!dataIsObject && !dataItemIsFunction)
throw Error('table binding requires a data array or dataItem function');
// If not set, read number of columns from data
if (numCols === undefined && dataIsArray && isArray(data[0])) {
for (numCols = rowIndex = 0; rowIndex < data.length; rowIndex++) {
if (data[0].length > numCols)
numCols = data[0].length;
}
cols = makeRangeIfNotArray(numCols);
}
// By here, rows and cols must be defined
if (!(numRows >= 0))
throw Error('table binding requires row information (either "rows" or a "data" array)');
if (!(numCols >= 0))
throw Error('table binding requires column information (either "columns" or "header")');
// Return the item value and update table cell if observable item changes
function unwrapItemAndSubscribe(rowIndex, colIndex) {
// Use a data function if provided; otherwise use the column value as a property of the row item
var rowItem = rows[rowIndex], colItem = cols[colIndex],
itemValue = dataItem ? (dataItemIsFunction ? dataItem(rowItem, colItem, data) : data[rowItem][colItem[dataItem]]) : data[rowItem][colItem];
if (ko.isObservable(itemValue)) {
itemSubs.push(itemValue.subscribe(function (newValue) {
if (tableBody)
tableBody.rows[rowIndex].cells[colIndex][elemTextProp] = newValue == null ? '' : newValue;
}));
itemValue = itemValue.peek ? itemValue.peek() : ko.ignoreDependencies(itemValue);
}
return itemValue == null ? '' : ko.utils.escape(itemValue);
}
// Ensure the class won't corrupt the HTML
if (evenClass)
evenClass = ko.utils.escape(evenClass);
if (tableClass)
tableClass = ko.utils.escape(tableClass);
var tbody = element.lastChild;
if (tbody.tagName.toLowerCase() == 'thead') {
element.appendChild(document.createElement('TBODY'));
tbody = element.lastChild;
}
// Generate the table body section
var html = '';
for (rowIndex = 0; rowIndex < numRows; rowIndex++) {
html += (evenClass && rowIndex % 2) ? '<tr class="' + evenClass + '">' : '<tr>';
var tr = document.createElement('TR');
for (colIndex = 0; colIndex < numCols; colIndex++) {
html += '<td>' + unwrapItemAndSubscribe(rowIndex, colIndex) + '</td>';
}
html += '</tr>';
}
var tbody = element.lastChild;
if (tbody.tagName.toLowerCase() == 'thead') {
element.appendChild(document.createElement('TBODY'));
tbody = element.lastChild;
}
// Remove previous table contents (use removeNode so any subscriptions will be disposed)
while (tbody.children[0])
ko.removeNode(tbody.children[0]);
// Insert new table contents
var tempDiv = document.createElement('table');
tempDiv.innerHTML = html;
var tempTable = tempDiv.firstChild;
while (tempTable.firstChild)
tbody.appendChild(tempTable.firstChild);
// Make sure subscriptions are disposed if the table is cleared
if (itemSubs) {
tableBody = element.tBodies[0];
ko.utils.domNodeDisposal.addDisposeCallback(tableBody, function () {
ko.utils.arrayForEach(itemSubs, function (itemSub) {
itemSub.dispose();
});
});
}
}
};
/*
* Escape a string for html representation
*/
ko.utils.escape = function (string) {
return ('' + string).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"').replace(/'/g, ''').replace(/\//g, '/');
};
/*
* Helper functions for finding minified property names
*/
function findNameMethodSignatureContaining(obj, match) {
for (var a in obj)
if (obj.hasOwnProperty(a) && obj[a].toString().indexOf(match) >= 0)
return a;
}
function findPropertyName(obj, equals) {
for (var a in obj)
if (obj.hasOwnProperty(a) && obj[a] === equals)
return a;
}
function findSubObjectWithProperty(obj, prop) {
for (var a in obj)
if (obj.hasOwnProperty(a) && obj[a] && obj[a][prop])
return obj[a];
}
/*
* ko.ignoreDependencies is used to access observables without creating a dependency
*/
if (!ko.ignoreDependencies) {
var depDet = findSubObjectWithProperty(ko, 'end'),
depDetBeginName = findNameMethodSignatureContaining(depDet, '.push({');
ko.ignoreDependencies = function (callback, object, args) {
try {
depDet[depDetBeginName](function () {
});
return callback.apply(object, args || []);
} finally {
depDet.end();
}
}
}
})(ko);