web前端|html教程
JS+CSS 做下拉菜单背景问题
web前端-html教程
select 滚动条
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下面的代码是改变下拉菜单样式的，可以正常使用，但是现在有个问题就是下拉的内容很多，我想到一定高度就自动有滚动条，麻烦哪位兄弟帮我看看,感觉感谢。
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var selects = document.getElementsByTagName(select);var isIE = (document.all && window.ActiveXObject && !window.opera) ? true : false;function $(id) {return document.getElementById(id);}function stopBubbling (ev) {ev.stopPropagation();}function rSelects() {for (i=0;i<selects.length;i++){selects[i].style.display = one;select_tag = document.createElement(div);select_tag.id = select_ + selects[i].name;select_tag.className = select_box;selects[i].parentNode.insertBefore(select_tag,selects[i]);select_info = document.createElement(div);select_info.id = select_info_ + selects[i].name;select_info.className= ag_select;select_info.style.cursor=pointer;select_tag.appendChild(select_info);select_ul = document.createElement(ul);select_ul.id = options_ + selects[i].name;select_ul.className = ag_options;select_ul.style.position=absolute;select_ul.style.display= one;select_ul.style.zIndex=999;select_tag.appendChild(select_ul);rOptions(i,selects[i].name);mouseSelects(selects[i].name);if (isIE){selects[i].onclick = new Function("clickLabels3(\"+selects[i].name+");window.event.cancelBubble = true;");}else if(!isIE){selects[i].onclick = new Function("clickLabels3(\"+selects[i].name+")");selects[i].addEventListener("click", stopBubbling, false);}}}function rOptions(i, name) {var options = selects[i].getElementsByTagName(option);var options_ul = options_ + name;for (n=0;n<selects[i].options.length;n++){option_li = document.createElement(li);option_li.style.cursor=pointer;option_li.className=open;$(options_ul).appendChild(option_li);option_text = document.createTextNode(selects[i].options[n].text);option_li.appendChild(option_text);option_selected = selects[i].options[n].selected;if(option_selected){option_li.className=open_selected;option_li.id=selected_ + name;$(select_info_ + name).appendChild(document.createTextNode(option_li.innerHTML));}option_li.onmouseover = function(){this.className=open_hover;}option_li.onmouseout = function(){if(this.id==selected_ + name){this.className=open_selected;}else {this.className=open;}} option_li.onclick = new Function("clickOptions("+i+","+n+",\"+selects[i].name+")");}}function mouseSelects(name){var sincn = select_info_ + name;$(sincn).onmouseover = function(){ if(this.className== ag_select) this.className= ag_select_hover; }$(sincn).onmouseout = function(){ if(this.className== ag_select_hover) this.className= ag_select; }if (isIE){$(sincn).onclick = new Function("clickSelects(\"+name+");window.event.cancelBubble = true;");}else if(!isIE){$(sincn).onclick = new Function("clickSelects(\"+name+");");$(select_info_ +name).addEventListener("click", stopBubbling, false);}}function clickSelects(name){var sincn = select_info_ + name;var sinul = options_ + name;for (i=0;i<selects.length;i++){if(selects[i].name == name){if( $(sincn).className == ag_select_hover){$(sincn).className = ag_select_open;$(sinul).style.display = \;}else if( $(sincn).className == ag_select_open){$(sincn).className = ag_select_hover;$(sinul).style.display = one;}}else{$(select_info_ + selects[i].name).className = ag_select;$(options_ + selects[i].name).style.display = one;}}}function clickOptions(i, n, name){var li = $(options_ + name).getElementsByTagName(li);$(selected_ + name).className=open;$(selected_ + name).id=\;li[n].id=selected_ + name;li[n].className=open_hover;$(select_ + name).removeChild($(select_info_ + name));select_info = document.createElement(div);select_info.id = select_info_ + name;select_info.className= ag_select;select_info.style.cursor=pointer;$(options_ + name).parentNode.insertBefore(select_info,$(options_ + name));mouseSelects(name);$(select_info_ + name).appendChild(document.createTextNode(li[n].innerHTML));$( options_ + name ).style.display = one ;$( select_info_ + name ).className = ag_select;selects[i].options[n].selected = selected;}window.onload = function(e) {bodyclick = document.getElementsByTagName(ody).item(0);rSelects();bodyclick.onclick = function(){for (i=0;i<selects.length;i++){$(select_info_ + selects[i].name).className = ag_select;$(options_ + selects[i].name).style.display = one;}}}
body{margin:0px; padding:0px; font-size:12px; color:#FFFFFB; background:#3d4045; }div,ul,li{margin:0; padding:0;}#macstyle1 .select_box{height:22px; width:271px;}#macstyle1 div.tag_select{display:block;color:#fff; text-align:left; padding-left:10px;width:271px;height:22px;background:url(http://img./upload/07/03/1372819568_91197.jpg) no-repeat;line-height:22px;}#macstyle1 div.tag_select_hover{display:block;color:#fff;text-align:left; padding-left:10px;width:271px;height:22px;background:url(http://img./upload/07/03/1372819568_91197.jpg) no-repeat;line-height:22px;}#macstyle1 div.tag_select_open{display:block;color:#fff;text-align:left; padding-left:10px;width:271px;height:22px;background:url(http://img./upload/07/03/1372819568_91197.jpg) no-repeat;line-height:22px;}#macstyle1 ul.tag_options{position:absolute;list-style:none;text-align:left; }#macstyle1 ul.tag_options li{ background:#414348;text-align:left; padding-left:10px;width:241px;height:15px;line-height:15px;color:#fff;overflow:auto;}#macstyle1 ul.tag_options li.open_hover{color:#fff; background:#6c6f75; }#macstyle1 ul.tag_options li.open_selected{color:#fff; }
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回复讨论(解决方案)
默认overflow是visible，会自动撑开，给#macstyle1 ul.tag_options一个合适的高度并让overflow-y:auto;就行了，为了美观overflow-x可以设置为hidden。出来滚动条之后宽度有点不够，建议加一点。
body{margin:0px; padding:0px; font-size:12px; color:#FFFFFB; background:#3d4045; }div,ul,li{margin:0; padding:0;}#macstyle1 .select_box{height:22px; width:271px;}#macstyle1 div.tag_select{display:block;color:#fff; text-align:left; padding-left:10px;width:271px;height:22px;background:url(http://img./upload/07/03/1372819568_91197.jpg) no-repeat;line-height:22px;}#macstyle1 div.tag_select_hover{display:block;color:#fff;text-align:left; padding-left:10px;width:271px;height:22px;background:url(http://img./upload/07/03/1372819568_91197.jpg) no-repeat;line-height:22px;}#macstyle1 div.tag_select_open{display:block;color:#fff;text-align:left; padding-left:10px;width:271px;height:22px;background:url(http://img./upload/07/03/1372819568_91197.jpg) no-repeat;line-height:22px;}#macstyle1 ul.tag_options{position:absolute;list-style:none;text-align:left;height:300px;overflow-y:auto;overflow-x:hidden;}#macstyle1 ul.tag_options li{ background:#414348;text-align:left; padding-left:10px;width:241px;height:15px;line-height:15px;color:#fff;overflow:auto;}#macstyle1 ul.tag_options li.open_hover{color:#fff; background:#6c6f75; }#macstyle1 ul.tag_options li.open_selected{color:#fff; }var selects = document.getElementsByTagName(select); var isIE = (document.all && window.ActiveXObject && !window.opera) ? true : false; function $(id) { return document.getElementById(id);} function stopBubbling (ev) { ev.stopPropagation();} function rSelects() { for (i=0;i<selects.length;i++){ selects[i].style.display = one; select_tag = document.createElement(div); select_tag.id = select_ + selects[i].name; select_tag.className = select_box; selects[i].parentNode.insertBefore(select_tag,selects[i]); select_info = document.createElement(div);select_info.id = select_info_ + selects[i].name; select_info.className= ag_select; select_info.style.cursor=pointer; select_tag.appendChild(select_info); select_ul = document.createElement(ul);select_ul.id = options_ + selects[i].name; select_ul.className = ag_options; select_ul.style.position=absolute; select_ul.style.display= one; select_ul.style.zIndex=999; select_tag.appendChild(select_ul); rOptions(i,selects[i].name); mouseSelects(selects[i].name); if (isIE){ selects[i].onclick = new Function("clickLabels3(\"+selects[i].name+");window.event.cancelBubble = true;"); } else if(!isIE){ selects[i].onclick = new Function("clickLabels3(\"+selects[i].name+")"); selects[i].addEventListener("click", stopBubbling, false); } }} function rOptions(i, name) { var options = selects[i].getElementsByTagName(option); var options_ul = options_ + name; for (n=0;n<selects[i].options.length;n++){ option_li = document.createElement(li); option_li.style.cursor=pointer; option_li.className=open; $(options_ul).appendChild(option_li); option_text = document.createTextNode(selects[i].options[n].text); option_li.appendChild(option_text); option_selected = selects[i].options[n].selected; if(option_selected){ option_li.className=open_selected; option_li.id=selected_ + name; $(select_info_ + name).appendChild(document.createTextNode(option_li.innerHTML)); } option_li.onmouseover = function(){ this.className=open_hover;} option_li.onmouseout = function(){ if(this.id==selected_ + name){this.className=open_selected; } else {this.className=open; } } option_li.onclick = new Function("clickOptions("+i+","+n+",\"+selects[i].name+")"); }} function mouseSelects(name){ var sincn = select_info_ + name;$(sincn).onmouseover = function(){ if(this.className== ag_select) this.className= ag_select_hover; } $(sincn).onmouseout = function(){ if(this.className== ag_select_hover) this.className= ag_select; }if (isIE){ $(sincn).onclick = new Function("clickSelects(\"+name+");window.event.cancelBubble = true;"); } else if(!isIE){ $(sincn).onclick = new Function("clickSelects(\"+name+");"); $(select_info_ +name).addEventListener("click", stopBubbling, false); } } function clickSelects(name){ var sincn = select_info_ + name; var sinul = options_ + name; for (i=0;i<selects.length;i++){ if(selects[i].name == name){ if( $(sincn).className == ag_select_hover){$(sincn).className = ag_select_open;$(sinul).style.display = \; } else if( $(sincn).className == ag_select_open){$(sincn).className = ag_select_hover;$(sinul).style.display = one; } } else{ $(select_info_ + selects[i].name).className = ag_select; $(options_ + selects[i].name).style.display = one; } } } function clickOptions(i, n, name){ var li = $(options_ + name).getElementsByTagName(li);$(selected_ + name).className=open; $(selected_ + name).id=\; li[n].id=selected_ + name; li[n].className=open_hover; $(select_ + name).removeChild($(select_info_ + name));select_info = document.createElement(div); select_info.id = select_info_ + name; select_info.className= ag_select; select_info.style.cursor=pointer; $(options_ + name).parentNode.insertBefore(select_info,$(options_ + name));mouseSelects(name);$(select_info_ + name).appendChild(document.createTextNode(li[n].innerHTML)); $( options_ + name ).style.display = one ; $( select_info_ + name ).className = ag_select; selects[i].options[n].selected = selected; } window.onload = function(e) { bodyclick = document.getElementsByTagName(ody).item(0); rSelects(); bodyclick.onclick = function(){ for (i=0;i<selects.length;i++){$(select_info_ + selects[i].name).className = ag_select; $(options_ + selects[i].name).style.display = one; } }}
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