JavaScript网站设计实践（六）编写live.html页面 改进表格显示

<h1> Tour dates</h1>
            <table summary="when and where you can see the band">
                <thead>
                    <tr>
                        <th>Date</th>
                        <th>City</th>
                        <th>Venue</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>June 9th</td>
                        <td>Portland,<abbr title="Oregon">OR</abbr></td>
                        <td>Crystal Ballroom</td>
                    </tr>
                    <tr>
                        <td>June 9th</td>
                        <td>Portland,<abbr title="Washington">WA</abbr></td>
                        <td>Crystal Ballroom</td>
                    </tr>
                    <tr>
                        <td>June 9th</td>
                        <td>Portland,<abbr title="California">CA</abbr></td>
                        <td>Crystal Ballroom</td>
                    </tr>
                    <tr>
                        <td>June 9th</td>
                        <td>Portland,<abbr title="Texas">TX</abbr></td>
                        <td>Crystal Ballroom</td>
                    </tr>
                    
                </tbody>
            </table>

td{
    padding: .5em 3em;
}

/**********live.html*************************/
dl{
    overflow: hidden;
}
dt{
    float: left;
}
dd{
    float: left;
}

tr.odd td{
    color: #233;
    background-color: #ec8;
}
tr.highlight td{
    color: #223;
    background-color: #cba;
}

dt{
    margin-right: 1em;
}
dd{
    margin-right: 3em;
}

/*******************给表格的偶数行添加样式*********************/
function stripeTables(){
    //旧浏览器对象检测
    if(!document.getElementsByTagName) return false;
    
    //获取元素
    var tables = document.getElementsByTagName("table");
    
    //隔行换色  添加class属性
    for(var i =0; i<tables.length; i++){
        var odd = false;
        var rows = tables[i].getElementsByTagName("tr");         //获取表格里的函数rows
        for(var j=0; j<rows.length; j++){
            if(odd == true){                                     
                alert(odd);
                addClass(rows[j],"odd");
                odd = false;
            }else{
                odd = true;
            }
        }
    }
    
    /*for(var i =0; i<tables.length; i++){
        var rows = tables[i].getElementsByTagName("tr");         //获取表格里的函数rows
        for(var j=0; j<rows.length; j++){
            if(j%2 == 0){
                addClass(rows[j],"odd");                         //偶数行时，添加class为odd的值
            }
        }
    }*/
    
}


/*****************鼠标浮动行高亮显示**************************/
function highlightRows(){
    //旧浏览器对象检测
    if(!document.getElementsByTagName) return false;
    
    //获取元素
    var rows = document.getElementsByTagName("tr");
    
    //高亮显示    鼠标移上则给这一行动态添加一个新class属性，鼠标移开则重新赋值为原来的class属性
    for(var i=0; i<rows.length; i++){
        rows[i].oldClassName = rows[i].className;            //把tr的class属性保存起来
        rows[i].onmouseover = function(){
            addClass(this,"highlight");                       //鼠标经过时添加clas为highlight的值
        }
        rows[i].onmouseout = function(){
            this.className = this.oldClassName;               //鼠标移开，还原之前的class值
        }
    }
}

/*****************输出缩略词表********************************/
function displayAbbreviations(){
    //旧浏览器对象检测
    if(!document.getElementsByTagName || !document.createElement || !document.createTextNode) return false;
    
    //获取元素
    var abbreviation = document.getElementsByTagName("abbr");
    if(abbreviation.length <1) return false;                  //如果没有abbr标签存在，则退出执行;否则，把abbr的title存入关联数组
    var defs = new Array();
    for(var i=0; i<abbreviation.length; i++){
        var current_abbr = abbreviation[i];
        if(current_abbr.childNodes.length<1) continue;        //如果有abbr标签，却没有直接点，说明是没有内容的abbr，则退出本次循环
        var definition = current_abbr.getAttribute("title");  //获取abbr的title属性值
        var key = current_abbr.lastChild.nodeValue;
        alert(key);
        defs[key] = definition;
    }
    
    //输出缩略词的表格
    var dlist = document.createElement("dl");
    for(key in defs){
        var definition = defs[key];
        var dtitle = document.createElement("dt");
        var dtitle_text = document.createTextNode(key);
        dtitle.appendChild(dtitle_text);
        var ddesc = document.createElement("dd");
        var ddesc_text = document.createTextNode(definition);
        ddesc.appendChild(ddesc_text);
        dlist.appendChild(dtitle);
        dlist.appendChild(ddesc);
    }
    
    if(dlist.childNodes.length < 1) return false;
    var header = document.createElement("h3");
    var header_text = document.createTextNode("Abbrviations");
    header.appendChild(header_text);
    
    var container = document.getElementById("content");
    container.appendChild(header);
    container.appendChild(dlist);
}



addLoadEvent(stripeTables);
addLoadEvent(highlightRows);
addLoadEvent(displayAbbreviations);