以下用于创建动态下拉列表的javascript函数似乎在选择了另一个列表时保留了上一个列表中的选项,并且与上一个列表不同。
function dynamicdropdown(listindex)
{
switch (listindex)
{
case "assaultrifle" :
document.getElementById("weaponbody").options[0]=new Option("Select Assault Rifle Body","");
document.getElementById("weaponbody").options[1]=new Option("ACR","acr");
document.getElementById("weaponbody").options[2]=new Option("ACR-E","acre");
document.getElementById("weaponbody").options[3]=new Option("AK-47","ak47");
document.getElementById("weaponbody").options[4]=new Option("AK-74","ak74");
document.getElementById("weaponbody").options[5]=new Option("Classic FAL","classicFal");
document.getElementById("weaponbody").options[6]=new Option("LWRC M6","lwrcm6");
document.getElementById("weaponbody").options[7]=new Option("Military M416","militaryM416");
document.getElementById("weaponbody").options[8]=new Option("M4","m4");
document.getElementById("weaponbody").options[9]=new Option("P416","p416");
document.getElementById("weaponbody").options[10]=new Option("SCAR-L","scarl");
document.getElementById("weaponbody").options[11]=new Option("Steyr Aug","steyrAug");
document.getElementById("weaponbody").options[12]=new Option("LVOA-S","lvoas");
document.getElementById("weaponbody").options[13]=new Option("SA-58","sa58");
break;
case "lmg" :
document.getElementById("weaponbody").options[0]=new Option("Select LMG Body","");
document.getElementById("weaponbody").options[1]=new Option("L86 LSW","l86lsw");
document.getElementById("weaponbody").options[2]=new Option("M249 B","m249b");
document.getElementById("weaponbody").options[3]=new Option("M249 Tactical Para","m249TacticalPara");
document.getElementById("weaponbody").options[4]=new Option("M60","m60");
document.getElementById("weaponbody").options[5]=new Option("M60 E4","m60e4");
document.getElementById("weaponbody").options[6]=new Option("M60 E6","m60e6");
document.getElementById("weaponbody").options[7]=new Option("MK46","mk46");
document.getElementById("weaponbody").options[8]=new Option("RPK-74","rpk74");
break;
case "pistol" :
document.getElementById("weaponbody").options[0]=new Option("Select Pistol Body","");
document.getElementById("weaponbody").options[1]=new Option("M1911","m1911");
document.getElementById("weaponbody").options[2]=new Option("M9","m9");
document.getElementById("weaponbody").options[3]=new Option("PF45","pf45");
document.getElementById("weaponbody").options[4]=new Option("586 Magnum","586Magnum");
document.getElementById("weaponbody").options[5]=new Option("Px4 Storm","px4Storm");
document.getElementById("weaponbody").options[6]=new Option("M9 A1","m9a1");
document.getElementById("weaponbody").options[7]=new Option("Defiler","defiler");
document.getElementById("weaponbody").options[8]=new Option("M45A1","m45a1");
break;
case "shotgun" :
document.getElementById("weaponbody").options[0]=new Option("Select Shotgun Body","");
document.getElementById("weaponbody").options[1]=new Option("M1014","m1014");
document.getElementById("weaponbody").options[2]=new Option("Super 90","super90");
document.getElementById("weaponbody").options[3]=new Option("M870","shipped");
document.getElementById("weaponbody").options[4]=new Option("SASG-12","sasg12");
document.getElementById("weaponbody").options[5]=new Option("Double Barrel Shotgun","doubleBarrelShotgun");
document.getElementById("weaponbody").options[6]=new Option("Saiga 12","saiga 12");
break;
case "smg" :
document.getElementById("weaponbody").options[0]=new Option("Select SMG Body","");
document.getElementById("weaponbody").options[1]=new Option("MP5","mp5");
document.getElementById("weaponbody").options[2]=new Option("MP5-A4 Burst Fire","mpa4BurstFire");
document.getElementById("weaponbody").options[3]=new Option("T821","t821");
document.getElementById("weaponbody").options[4]=new Option("SMG-9","smg9");
document.getElementById("weaponbody").options[5]=new Option("Vector","vector");
document.getElementById("weaponbody").options[6]=new Option("Black Market T821","blackMarkett821");
document.getElementById("weaponbody").options[7]=new Option("AUG A3 Para XS","AUG A3 Para XS");
break;
case "dmr" :
document.getElementById("weaponbody").options[0]=new Option("Select DMR Body","");
document.getElementById("weaponbody").options[1]=new Option("M1A","m1a");
document.getElementById("weaponbody").options[2]=new Option("SRS","srs");
document.getElementById("weaponbody").options[3]=new Option("SOCOM 16","socom16");
document.getElementById("weaponbody").options[4]=new Option("Mk17 SR","mk17sr");
document.getElementById("weaponbody").options[5]=new Option("SCAR-H","scarh");
document.getElementById("weaponbody").options[6]=new Option("M44","m44");
break;
}
return true;
}
html在这里:
<div class="sub_category_div" id="sub_category_div">
<label class="input-label">WEAPON BODY</label>
<script type="text/javascript" language="JavaScript">
document.write('<select name="weaponbody" id="weaponbody"><option value="">Weapon Body</option></select>')
</script>
</div>
与突击步枪列表混合的SMG列表示例如下图所示:
关于为什么会这样做的任何想法都会有所帮助。
答案 0 :(得分:1)
在添加新选项之前清除选项:
var first = document.getElementsByTagName('li')[0];
var label = document.getElementsByTagName('label')[0];
first.onmouseover = function(){
label.style.display = 'block';
}
first.onmouseout = function(){
label.style.display = 'none';
}
答案 1 :(得分:1)
我刚补充说:
document.getElementById('weaponbody').options.length = 0;
到这里的onchange:
<select id="weapontype" name="weapontype" onchange="javascript: dynamicdropdown(this.options[this.selectedIndex].value);">
结果:
<select id="weapontype" name="weapontype" onchange="javascript: document.getElementById('weaponbody').options.length = 0; dynamicdropdown(this.options[this.selectedIndex].value);">
完美无缺。