utils for DOM manipulation and fetching info of a webpage
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// ==UserScript==
// @name html-utils
// @name:de html-utils
// @namespace dannysaurus.camamba
// @version 0.1
// @license MIT License
// @grant GM_xmlhttpRequest
// @grant GM_getValue
// @grant GM_setValue
// @require https://greasyfork.org/scripts/22752-object-utils/code/object-utils.js
// @description utils for DOM manipulation and fetching info of a webpage
// @description:de utils for DOM manipulation and fetching info of a webpage
// ==/UserScript==
var LIB = LIB || {};
/**
* Html Elements
* @type {{Element, Button, Div, Input, Checkbox, Label, TextArea, Option, Select}}
*/
LIB.htmlUtils = (function() {
'use strict';
var objectUtils = LIB.objectUtils;
var keeper = objectUtils.Keeper();
/**
* Adds a HTML child node to a HTML parent node.
* @param {HtmlElement|Element} parent - The html parent node
* @param {HtmlElement|Element} child - The html child Element to be connected to the parent node
* @param {boolean} [asFirstChild] - <code>true</code> to have the child be added as the first child before any other child
*/
var connectParentChild = function(parent, child, asFirstChild) {
var elParent = parent instanceof Element ? parent.domElement : parent;
var elChild = child instanceof Element ? child.domElement : child;
if (asFirstChild && elParent.hasChildNodes()) {
elParent.insertBefore(elChild, elParent.firstChild);
} else {
elParent.appendChild(elChild);
}
};
/**
* Removes a HTML child element from a HTML parent node.
* @param {HTMLElement} parent - The parent node
* @param {HTMLElement} elChild - The child node to be removed of the parent element
*/
var disconnectParentChild = function(parent, elChild) {
var elParent = parent instanceof Element ? parent.domElement : parent;
elParent.removeChild(elChild);
};
/**
* Removes all HTML children from a parent node.
* @param {HTMLElement} parent - The HTML parent node
*/
var removeAllChildren = function(parent) {
var elParent = parent instanceof Element ? parent.domElement : parent;
while (elParent.hasChildNodes()) {
elParent.removeChild(elParent.firstChild);
}
};
/**
* Sorts options of a html 'select' element from a certain property of the option (e.g. text or value).
* @param {HTMLElement|Element} select - The Select Element to be sorted
* @param {string} [property=text] - The Name of the property from wich the option should be compared like <code>value</code> or <code>text</code>.
* @param {boolean} [isOrderDescending] - <code>true</code> to reverse the sort order.
*/
var sortSelectBy = function(select, property, isOrderDescending) {
var elSelect = select instanceof Element ? select.domElement : select;
var propertyName = property || 'text';
var sortOptions = [];
// options to array
for (var i = 0; i <= select.length - 1; i++) {
var option = select[i];
sortOptions.push({
value:option.value,
text:option.text,
selected:option.selected
});
}
// sort array
sortOptions.sort(function (a, b) {
if (a[propertyName] < b[propertyName]) { return isOrderDescending ? 1 : -1; }
if (a[propertyName] > b[propertyName]) { return isOrderDescending ? -1 : 1; }
return 0;
});
// array to options
sortOptions.forEach(function (opt, i) {
select[i].text = opt.text;
select[i].value = opt.value;
select[i].selected = opt.selected;
});
};
/**
* Wrapper for any type of HTML element.
* @param {string} tagName - The type of element to be created and value of the <code>nodeName</code> attribute
* @param {string} [id] - The value for the <code>id</code> attribute
* @param {string} [className] - The value for the <code>class</code> attribute
* @constructor
*/
function Element(tagName, id, className) {
if (!(this instanceof Element)) {
return new Element(tagName, id, className);
}
var domElement = document.createElement(tagName);
if (typeof id !== 'undefined') {
domElement.id = id;
}
if (typeof className !== 'undefined') {
domElement.className = className;
}
Object.defineProperties(this, {
domElement: {
configurable: true, enumerable: true,
get: function () { return domElement }
},
id: {
configurable: true, enumerable: true,
get: function() { return domElement.id; },
set: function(value) { domElement.id = value; }
},
className: {
configurable: true, enumerable: true,
get: function() { return domElement.className; },
set: function(value) { domElement.className = value; }
}
});
}
Element.prototype = {
constructor: Element,
/**
* Adds this HTML element to a parent node HTML element.
* It will be added as the last child of the node.
* @param {HTMLElement|Element} elParent - The parent HTML node element
*/
addAsLastChild : function(elParent) {
var parent = elParent instanceof Element ? elParent.domElement : elParent;
connectParentChild(elParent, this.domElement, false);
},
/**
* Adds this HTML element to a parent node HTML element.
* It will be added as the first child of the node.
* @param {HTMLElement|Element} elParent - The parent HTML node element
*/
addAsFirstChild : function(elParent) {
var parent = elParent instanceof Element ? elParent.domElement : elParent;
connectParentChild(elParent, this, true);
},
/**
* Adds this HTML element to a parent node HTML element.
* All children elements will be removed and replaced with this node.
* @param {HTMLElement|Element} elParent - The parent HTML node element
*/
addAsOnlyChild : function(elParent) {
var parent = elParent instanceof Element ? elParent.domElement : elParent;
removeAllChildren(elParent);
connectParentChild(elParent, this);
},
/**
* Appends Html node elements to this node as their last children.
* @param {...HTMLElement|Element|Text} elements - Html elements to be added as children.
*/
appendChildren : function(elements) {
for (var i = 0; i <= arguments.length - 1; i++) {
var child = arguments[i];
this.domElement.appendChild(child instanceof Element ? child.domElement : child);
}
},
/**
* Adds Html node Elements to this node as their new children.
* All current children elements will be removed and replaced with the new children.
* @param {...HTMLElement} [elements] Html elements to be added as children
* No argument will only remove all children.
*/
setChildren : function(elements) {
removeAllChildren(this);
for (var i = 0; i <= arguments.length - 1; i++) {
connectParentChild(this, arguments[i]);
}
}
};
/**
* Wrapper for a 'button' html element.
* @param {string} [className] - the value for the <code>class</code> attribute
* @param {function} [callback] - the callback function for the <code>onclick<code> event
* @param {string} [text] - the content text of the element (text shown on the button)
* @param {string} [id] - the value for the <code>id</code> attribute
* @constructor
*/
function Button(className, callback, text, id) {
if (!(this instanceof Button)) {
return new Button(className, callback, text, id);
}
Element.call(this, 'BUTTON', id, className);
if (typeof callback === 'function') {
this.domElement.addEventListener('click', callback);
}
if (typeof text !== 'undefined') {
this.domElement.appendChild(document.createTextNode(text));
}
}
objectUtils.extend(Button).from(Element);
/**
* Wrapper for a 'div' html element.
* @param {string} [id] - The value for the <code>id</code> attribute
* @param {string} [className] - The value for the <code>class</code> attribute
* @constructor
*/
function Div(id, className) {
if (!(this instanceof Div)) {
return new Div(id, className);
}
Element.call(this, 'DIV', id, className);
}
objectUtils.extend(Div).from(Element);
/**
* Wrapper for an 'input' HTML element as a field for text.
* @param {number|string} [maxLength] - The maximum number of characters
* @param {string} [text] - The value of the <code>text</code> attribute (content initially shown in the field)
* @param {string} [className] - The value for the <code>class</code> attribute
* @param {string} [id] - The value for the <code>id</code> attribute
* @constructor
*/
function Input(maxLength, text, className, id) {
if (!(this instanceof Input)) {
return new Input(maxLength, text, className, id);
}
Element.call(this, 'INPUT', id, className);
if (typeof maxLength !== 'undefined') {
this.domElement.maxlength = maxLength;
}
if (typeof text !== 'undefined') {
this.domElement.value = text;
}
}
objectUtils.extend(Input).from(Element);
/**
* Creates an 'input' HTML element of type 'checkbox'.
* @param {function} [callback] - The callback function for the <code>onChange<code> event
* @param {string} [className] - The value for the <code>class</code> attribute
* @param {string} [id] - The value for the <code>id</code> attribute
* @constructor
*/
function Checkbox (callback, className, id) {
if (!(this instanceof Checkbox)) {
return new Checkbox(callback, className, id);
}
Element.call(this, 'INPUT', id, className);
this.domElement.type = 'checkbox';
if (typeof callback === 'function') {
this.domElement.addEventListener('change', callback);
}
}
objectUtils.extend(Checkbox).from(Element);
/**
* Wrapper for a 'label' html element.
* @param {string} htmlFor - The value of the <code>for</code> attribute. The id value of another element to bind the label to that element.
* @param {string} [text] - The content text of the element (text shown on the label)
* @param {string} [className] - The value for the <code>class</code> attribute
* @param {string} [id] - The value for the <code>id</code> attribute
* @constructor
*/
function Label(htmlFor, text, className, id) {
if (!(this instanceof Label)) {
return new Label(htmlFor, text, className, id);
}
Element.call(this, 'LABEL', id, className);
if (typeof text !== 'undefined') {
this.domElement.appendChild(document.createTextNode(text));
}
if (typeof htmlFor !== 'undefined') {
this.domElement.htmlFor = htmlFor;
}
}
objectUtils.extend(Label).from(Element);
/**
* Wrapper for a 'TextArea' html element.
* @param {number|string} [cols] - The number of columns
* @param {number|string} [maxLength] The maximum number of characters
* @param {string} [text] - The value of the <code>text</code> attribute (content initially shown in the field)
* @param {string} [className] - The value for the <code>class</code> attribute
* @param {string} [id] - The value of the <code>id</code> attribute
* @constructor
*/
function TextArea(cols, maxLength, text, className, id) {
if (!(this instanceof TextArea)) {
return new TextArea(cols, maxLength, text, className, id);
}
Element.call(this, 'TEXTAREA', id, className);
if (typeof cols !== 'undefined') {
this.domElement.cols = cols;
}
if (typeof maxLength !== 'undefined') {
this.domElement.maxlength = maxLength;
}
if (typeof text !== 'undefined') {
this.domElement.value = text;
}
}
objectUtils.extend(TextArea).from(Element);
/**
* Wrapper for an 'option' html element which can be added to a 'select' html element.
* @param text The value of the <code>text</code> attribute shown in the select dropdown
* @param value THe value of the <code>value</code> attribute
* @constructor
*/
function Option(text, value) {
if (!(this instanceof Option)) {
return new Option(text, value);
}
Element.call(this, 'OPTION');
this.domElement.text = text;
this.domElement.value = value;
}
objectUtils.extend(Option).from(Element);
/**
* Wrapper for a 'Select' html element.
* @param {string} [id] - The value of the <code>id</code> attribute
* @param {function} [callback] - callback function triggered by the events <code>OnChange</code>, <code>OnKeyUp</code> and <code>OnFocus</code>
* @param {string} [className] - The value for the <code>class</code> attribute
* @constructor
*/
function Select(className, callback, id) {
if (!(this instanceof Select)) {
return new Select(className, id);
}
Element.call(this, 'SELECT', id, className);
var idx = keeper.push({ onChangeCallback : callback });
Object.defineProperty(this, 'idx', { get: function() { return idx } });
Select.prototype.setOnChangeKeyUpFocus(callback);
}
Select.prototype = {
constructor: Select,
addNewOption: function(text, value) {
var newOption = Option(text, value);
this.domElement.add(newOption.domElement);
return newOption;
},
sortOptionsByText: function(isOrderDesc) {
sortSelectBy(this.domElement, 'text', isOrderDesc);
},
sortOptionsByValue: function(isOrderDesc) {
sortSelectBy(this.domElement, 'value', isOrderDesc);
},
/**
* Sets a callback function triggered from the events <code>OnChange</code>, <code>OnKeyUp</code> and <code>OnFocus</code>.
* Removes any former callback function registered to these events.
* @param {function} callback
*/
setOnChangeKeyUpFocus: function(callback) {
var newCallback = (typeof callback === 'function') ? callback : objectUtils.emptyFunction;
var formerCallback = keeper.get(this.idx).onChangeCallback;
this.domElement.removeEventListener("focus", formerCallback);
this.domElement.removeEventListener("change", formerCallback);
this.domElement.removeEventListener("keyup", formerCallback);
keeper.get(this.idx).onChangeCallback = newCallback;
this.domElement.addEventListener("focus", newCallback);
this.domElement.addEventListener("change", newCallback);
this.domElement.addEventListener("keyup", newCallback);
}
};
objectUtils.extend(Select).from(Element);
/**
* Parses a param object into a query string and vice verca.
* @param {Object|string} query - the queryObject object or query string
* @return {string|Object}
*/
var parseParams = function(query){
var result;
if (typeof query === 'string') {
result = {};
var decode = function(s) {
return decodeURIComponent(s.replace(/\+/g, " "));
};
var match, search = /([^&=]+)=?([^&]*)/g;
while ((match = search.exec(query)) !== null) {
result[decode(match[1])] = decode(match[2]);
}
return result;
} else {
result = "";
Object.keys(query).forEach(function(key, index) {
if (index >= 1) {
result += "&";
}
result += key + "=" + query[key];
});
return result;
}
};
/**
* Deals with parameters of a query.
* @param {string|Object} query - the query search as a string or as parameter object in {key:value} form
* @constructor
*/
function Params(query) {
if (!(this instanceof Params)) {
return new Params(query);
}
var _params = {};
Object.defineProperties(this, {
/** The {key:value} parameter object */
queryObject: {
get: function() { return _params; },
enumerable: true, configurable: true
},
/** The queryString without leading '?' */
queryString: {
get: function () {
if (!_params || Object.keys(_params).length === 0) {
return "";
} else {
return parseParams(_params);
}
},
set: function(val) {
if (val) {
if (val.charAt(0) === '?') {
val = val.substring(1);
}
_params = parseParams(val);
} else {
_params = {};
}
},
enumerable: true, configurable: true
}
});
if (typeof query === 'string') {
this.queryString = query;
} else {
_params = query;
}
Object.defineProperty(this, "value", {
get: function () { return this.queryString; }
});
}
objectUtils.extend(Params).from(objectUtils.Truthy);
var getPageAsync = function(url, onSuccess, onError) {
if (typeof onSuccess !== 'function') { onSuccess = objectUtils.emptyFunction;}
if (typeof onError !== 'function') { onError = objectUtils.emptyFunction;}
return GM_xmlhttpRequest({
method: 'GET',
url: url,
onload: function(resp) {
if (resp.status == 200 || resp.status == 304) {
resp.html = new DOMParser().parseFromString(resp.responseText, 'text/html');
onSuccess(resp);
} else {
onError(resp);
}
},
onerror: onError
});
};
return {
Element: Element,
Button: Button,
Div : Div,
Input : Input,
Checkbox : Checkbox,
Label : Label,
TextArea : TextArea,
Option : Option,
Select : Select,
Params : Params,
requestPageAsync : getPageAsync
};
})();