超越 DOM

輕鬆使用 DOM 的技巧和訣竅

function insertAfter(parent, node, referenceNode) {
    if(referenceNode.nextSibling) {
        parent.insertBefore(node, referenceNode.nextSibling);
    } else {
        parent.appendChild(node);
    }
}
function prependChild(parent, node) {
    if (parent.firstChild) {
        parent.insertBefore(node, parent.firstChild);
    } else {
        parent.appendChild(node);
    }
}

function insertAfter(parent, node, referenceNode) {
    parent.insertBefore(node, referenceNode.nextSibling);
}
function prependChild(parent, node) {
    parent.insertBefore(node, parent.firstChild);
}

node1.parentNode.insertBefore(node2, node1);

node1.parentNode.insertBefore(node1.nextSibling, node1);

if (!window['Node']) {
    window.Node = new Object();
    Node.ELEMENT_NODE = 1;
    Node.ATTRIBUTE_NODE = 2;
    Node.TEXT_NODE = 3;
    Node.CDATA_SECTION_NODE = 4;
    Node.ENTITY_REFERENCE_NODE = 5;
    Node.ENTITY_NODE = 6;
    Node.PROCESSING_INSTRUCTION_NODE = 7;
    Node.COMMENT_NODE = 8;
    Node.DOCUMENT_NODE = 9;
    Node.DOCUMENT_TYPE_NODE = 10;
    Node.DOCUMENT_FRAGMENT_NODE = 11;
    Node.NOTATION_NODE = 12;
}

function innerText(node) {
    // is this a text or CDATA node?
    if (node.nodeType == 3 || node.nodeType == 4) {
        return node.data;
    }
    var i;
    var returnValue = [];
    for (i = 0; i < node.childNodes.length; i++) {
        returnValue.push(innerText(node.childNodes[i]));
    }
    return returnValue.join('');
}

function handle_button() {
    var parent = document.getElementById('myContainer');
    var div = document.createElement('div');
    div.className = 'myDivCSSClass';
    div.id = 'myDivId';
    div.style.position = 'absolute';
    div.style.left = '300px';
    div.style.top = '200px';
    var text = "This is the first text of the rest of this code";
    var textNode = document.createTextNode(text);
    div.appendChild(textNode);
    parent.appendChild(div);
}

function elem(name, attrs, style, text) {
    var e = document.createElement(name);
    if (attrs) {
        for (key in attrs) {
            if (key == 'class') {
                e.className = attrs[key];
            } else if (key == 'id') {
                e.id = attrs[key];
            } else {
                e.setAttribute(key, attrs[key]);
            }
        }
    }
    if (style) {
        for (key in style) {
            e.style[key] = style[key];
        }
    }
    if (text) {
        e.appendChild(document.createTextNode(text));
    }
    return e;
}

function handle_button() {
    var parent = document.getElementById('myContainer');
    parent.appendChild(elem('div',
      {class: 'myDivCSSClass', id: 'myDivId'}
      {position: 'absolute', left: '300px', top: '200px'},
      'This is the first text of the rest of this code'));
}

// return next node in document order
function nextNode(node) {
    if (!node) return null;
    if (node.firstChild){
        return node.firstChild;
    } else {
        return nextWide(node);
    }
}
// helper function for nextNode()
function nextWide(node) {
    if (!node) return null;
    if (node.nextSibling) {
        return node.nextSibling;
    } else {
        return nextWide(node.parentNode);
    }
}
// return previous node in document order
function prevNode(node) {
    if (!node) return null;
    if (node.previousSibling) {
      return previousDeep(node.previousSibling);
    }
    return node.parentNode;
}
// helper function for prevNode()
function previousDeep(node) {
    if (!node) return null;
    while (node.childNodes.length) {
        node = node.lastChild;
    }
    return node;
}

// return an Array of all nodes, starting at startNode and
// continuing through the rest of the DOM tree
function listNodes(startNode) {
    var list = new Array();
    var node = startNode;
    while(node) {
        list.push(node);
        node = nextNode(node);
    }
    return list;
}
// The same as listNodes(), but works backwards from startNode.
// Note that this is not the same as running listNodes() and
// reversing the list.
function listNodesReversed(startNode) {
    var list = new Array();
    var node = startNode;
    while(node) {
        list.push(node);
        node = prevNode(node);
    }
    return list;
}
// apply func to each node in nodeList, return new list of results
function map(list, func) {
    var result_list = new Array();
    for (var i = 0; i < list.length; i++) {
        result_list.push(func(list[i]));
    }
    return result_list;
}
// apply test to each node, return a new list of nodes for which
// test(node) returns true
function filter(list, test) {
    var result_list = new Array();
    for (var i = 0; i < list.length; i++) {
        if (test(list[i])) result_list.push(list[i]);
    }
    return result_list;
}

// A list of all the element names in document order
function isElement(node) {
    return node.nodeType == Node.ELEMENT_NODE;
}
function nodeName(node) {
    return node.nodeName;
}
var elementNames = map(filter(listNodes(document),isElement), nodeName);
// All the text from the document (ignores CDATA)
function isText(node) {
    return node.nodeType == Node.TEXT_NODE;
}
function nodeValue(node) {
    return node.nodeValue;
}
var allText = map(filter(listNodes(document), isText), nodeValue);

Dethe Elza 現在最喜愛的頭銜是“首席瘋狂科學家（Chief Mad Scientist）”。可以透過電子郵件 delza@livingcode.org 與他聯繫。他在 http://livingcode.blogspot.com/ 上主要記錄著關於 Python 和 Mac OS X 方面的 blog。歡迎對本專欄提出意見和建議。