Firefox:Dive Into Greasemonkey/5.8. Case study: Access Bar

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5.8. 实例研究: Access Bar

在固定的状态栏中显示键盘快捷键

Access Bar 可以显示出页面中所定义的快捷键。快捷键是由网页的作者定义的用来增强网页可访问性的一种键盘快捷方式。您可以通过键盘快速地访问某个链接或是某个表单。请查阅 accesskeys (http://diveintoaccessibility.org/day_15_defining_keyboard_shortcuts.html) 以获得更多的信息.

Firefox 支持使用快捷键，但是它不会在页面中显示快捷键是如何定义的。由此诞生了 Access Bar.

‘’‘例子: accessbar.user.js (http://diveintogreasemonkey.org/download/accessbar.user.js)

// ==UserScript==
// @name          Access Bar
// @namespace     http://diveintogreasemonkey.org/download/
// @description   show accesskeys defined on page
// @include       *
// ==/UserScript==

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

var akeys, descriptions, a, desc, label, div;
akeys = document.evaluate(
    "//*[@accesskey]",
    document,
    null,
    XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
    null);
if (!akeys.snapshotLength) { return; }
descriptions = new Array();
desc = '';
for (var i = 0; i < akeys.snapshotLength; i++) {
    a = akeys.snapshotItem(i);
    desctext = '';
    if (a.nodeName == 'INPUT') {
        label = document.evaluate("//label[@for='" + a.name + "']",
            document,
            null,
            XPathResult.FIRST_ORDERED_NODE_TYPE,
            null).singleNodeValue;
        if (label) {
            desctext = label.title;
            if (!desctext) { desctext = label.textContent; }
        }
    }
    if (!desctext) { desctext = a.textContent; }
    if (!desctext) { desctext = a.title; }
    if (!desctext) { desctext = a.name; }
    if (!desctext) { desctext = a.id; }
    if (!desctext) { desctext = a.href; }
    if (!desctext) { desctext = a.value; }
    desc = '<strong>[' +
        a.getAttribute('accesskey').toUpperCase() + ']</strong> ';
    if (a.href) {
        desc += '<a href="' + a.href + '">' + desctext + '</a>';
    } else {
        desc += desctext;
    }
    descriptions.push(desc);
}
descriptions.sort();
div = document.createElement('div');
div.id = 'accessbar-div-0';
desc = '<div><ul><li class="first">' + descriptions[0] + '</li>';
for (var i = 1; i < descriptions.length; i++) {
    desc = desc + '<li>' + descriptions[i] + '</li>';
}
desc = desc + '</ul></div>';
div.innerHTML = desc;
document.body.style.paddingBottom = "4em";
window.addEventListener(
    "load",
    function() {
        document.body.appendChild(div);
    },
    true);
addGlobalStyle(
'#accessbar-div-0 {'+
'  position: fixed;' +
'  left: 0;' +
'  right: 0;' +
'  bottom: 0;' +
'  top: auto;' +
'  border-top: 1px solid silver;' +
'  background: black;' +
'  color: white;' +
'  margin: 1em 0 0 0;' +
'  padding: 5px 0 0.4em 0;' +
'  width: 100%;' +
'  font-family: Verdana, sans-serif;' +
'  font-size: small;' +
'  line-height: 160%;' +
'}' +
'#accessbar-div-0 a,' +
'#accessbar-div-0 li,' +
'#accessbar-div-0 span,' +
'#accessbar-div-0 strong {' +
'  background-color: transparent;' +
'  color: white;' +
'}' +
'#accessbar-div-0 div {' +
'  margin: 0 1em 0 1em;' +
'}' +
'#accessbar-div-0 div ul {' +
'  margin-left: 0;' +
'  margin-bottom: 5px;' +
'  padding-left: 0;' +
'  display: inline;' +
'}' +
'#accessbar-div-0 div ul li {' +
'  margin-left: 0;' +
'  padding: 3px 15px;' +
'  border-left: 1px solid silver;' +
'  list-style: none;' +
'  display: inline;' +
'}' +
'#accessbar-div-0 div ul li.first {' +
'  border-left: none;' +
'  padding-left: 0;' +
'}');

这段代码可以被分为六个部分:

1.定义一个辅助函数 addGlobalStyle

2.找出页面中含有 accesskey 属性的全部元素.

3.遍历所有这些元素，决定每个元素最恰当的文本描述

4.对可以通过快捷键访问的元素创建链接,把这些链接经过排序组成一个列表.FIXME

5.把列表通过标准的ul,li元素加入到页面中.

6.为列表设计样式,使它作为一个固定的faux-status-barFIXME出现在页面的底部.

首先,我定义一个辅助函数 addGlobalStyle ,来插入我自己的CSS样式(在第六步时会用到).更多的信息请参见Adding CSS styles

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

第二步,找出页面中含有accesskey属性的全部元素.在Firefox的XPath支持下可以很容易地完成.如果XPath没有返回结果,脚本就会退出FIXME,因此什么也不会显示.更多的信息请参见Doing something for every element with a certain attribute

var akeys, descriptions, a, i, desc, label, div;
akeys = document.evaluate(
    "//*[@accesskey]",
    document,
    null,
    XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
    null);
if (!akeys.snapshotLength) { return; }

第三步，建立一个的列表,包含所有可以用快捷键访问的元素的恰当描述.由于键盘快捷键属性可以出现在很多不同的HTML元素中,所以这是整个脚本中最复杂的部分.

一个表单中的 input 元素可以有一个键盘快捷键定义. input 元素可能含有(也可能没有)一个包含associated text label的 associated label.如果有的话,那么这个label可能含有一个能够给出关于这个input field更多信息的title属性,也可能label属性只含有文字.也可能input 元素根本就没有associated label,在这种情况下,我最多只能得到input 元素的value属性FIXME

另一方面，代替 label describes 中的input元素，label 自身可以定义快捷键。所以，我将搜索 label element中title属性的描述FIXME.如果title属性不存在,将退回到the text of the label

一个链接也可以被指派一个快捷键.如果是这样的话，选择 link text 是理所当然的。但是如果链接不包含文本(例如，它只包含一个图片)，那么会选择链接的 title 属性。如果链接不包含 text 和 title，将退回到链接的 name 属性，如果那也没有，就使用链接的 id 属性.

Ain't heuristics a bitch? 这是一个完整的算法。请注意，akeys 是 XPathResult 对象，所以我需要调用 akeys.snapshotItem(i) 来获取所有结果。

descriptions = new Array();
desc = '';
for (var i = 0; i < akeys.snapshotLength; i++) {
    a = akeys.snapshotItem(i);
    desctext = '';
    if (a.nodeName == 'INPUT') {
        label = document.evaluate("//label[@for='" + a.name + "']",
            document,
            null,
            XPathResult.FIRST_ORDERED_NODE_TYPE,
            null).singleNodeValue;
        if (label) {
            desctext = label.title;
            if (!desctext) { desctext = label.textContent; }
        }
    }
    if (!desctext) { desctext = a.textContent; }
    if (!desctext) { desctext = a.title; }
    if (!desctext) { desctext = a.name; }
    if (!desctext) { desctext = a.id; }
    if (!desctext) { desctext = a.href; }
    if (!desctext) { desctext = a.value; }
    desc = '<strong>[' +
        a.getAttribute('accesskey').toUpperCase() + ']</strong> ';
    if (a.href) {
        desc += '<a href="' + a.href + '">' + desctext + '</a>';
    } else {
        desc += desctext;
    }
    descriptions.push(desc);
}

第四步，用 Javascript 提供的方法对数组进行排序。

descriptions.sort();

</pre>

第五步,创建HTML语句来载入可用快捷键访问元素的列表.我创建一个

标记,把前面的HTML语句作为一个字符串,设置好

标记的innerHTML.最后,把它加到页面的结尾处.因为当用户脚本运行时,对页面做出大规模的修改应该发生在页面完成载入之后.因此我使用 window.addEventListener 加入 onload 事件(event)来把

标记加入到页面中.

关于 innerHTML 的使用方法,请参见快速插入复杂的HTML片段。关于 window.addEventListener 的使用方法,请参见对已载入的页面做后续处理。

div = document.createElement('div');
div.id = 'accessbar-div-0';
desc = '<div><ul><li class="first">' + descriptions[0] + '</li>';
for (var i = 1; i < descriptions.length; i++) {
    desc = desc + '<li>' + descriptions[i] + '</li>';
}
desc = desc + '</ul></div>';
div.innerHTML = desc;
document.body.style.paddingBottom = "4em";
window.addEventListener(
    "load",
    function() {
        document.body.appendChild(div);
    },
    true);

最后,在第六步,为了使插入的HTML看起来更协调,我在页面中加入了自己的CSS declarations.(它将作为一个固定的黑色状态栏出现在页面的底部.即时当您滚动页面时,它仍然在那里,这是因为Firefox提供了用于定位的fixed display type的支持).更多的信息请参见Adding CSS styles

addGlobalStyle(
'#accessbar-div-0 {'+
'  position: fixed;' +
'  left: 0;' +
'  right: 0;' +
'  bottom: 0;' +
'  top: auto;' +
'  border-top: 1px solid silver;' +
'  background: black;' +
'  color: white;' +
'  margin: 1em 0 0 0;' +
'  padding: 5px 0 0.4em 0;' +
'  width: 100%;' +
'  font-family: Verdana, sans-serif;' +
'  font-size: small;' +
'  line-height: 160%;' +
'}' +
'#accessbar-div-0 a,' +
'#accessbar-div-0 li,' +
'#accessbar-div-0 span,' +
'#accessbar-div-0 strong {' +
'  background-color: transparent;' +
'  color: white;' +
'}' +
'#accessbar-div-0 div {' +
'  margin: 0 1em 0 1em;' +
'}' +
'#accessbar-div-0 div ul {' +
'  margin-left: 0;' +
'  margin-bottom: 5px;' +
'  padding-left: 0;' +
'  display: inline;' +
'}' +
'#accessbar-div-0 div ul li {' +
'  margin-left: 0;' +
'  padding: 3px 15px;' +
'  border-left: 1px solid silver;' +
'  list-style: none;' +
'  display: inline;' +
'}' +
'#accessbar-div-0 div ul li.first {' +
'  border-left: none;' +
'  padding-left: 0;' +
'}');

[编辑]

下载

accessbar.user.js (http://diveintogreasemonkey.org/download/accessbar.user.js)

[编辑]

参见

← 5.7. 实例研究: Zoom Textarea

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Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 510

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1367

Strict Standards: Non-static method Namespace::getTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1387

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 99

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1437

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1439

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1439

Strict Standards: Non-static method Namespace::getImage() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1505

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1023

Strict Standards: Non-static method Namespace::getTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1024

Strict Standards: Non-static method Namespace::getUser() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1024

Strict Standards: Non-static method Namespace::isTalk() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 99

Strict Standards: Non-static method Namespace::getSpecial() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/languages/Language.php on line 1456

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1450

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Non-static method Title::newFromText() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

Strict Standards: Non-static method Namespace::getCanonicalIndex() should not be called statically, assuming $this from incompatible context in /home/mozcn/html/mediawiki-1.3.18/includes/Title.php on line 695

Notice: Only variable references should be returned by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Namespace.php on line 138

Strict Standards: Only variables should be passed by reference in /home/mozcn/html/mediawiki-1.3.18/includes/Skin.php on line 1452

取自"http://wiki.mozcn.org/index.php/Firefox:Dive_Into_Greasemonkey/5.8._Case_study:_Access_Bar"

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