<script>
function getDistrictListByName(name,div){
var
dha=["Manikganj","Gagipur","Gopalgonj"];
var chi=["Cox bazar","feny"];
var khu=["khulna","molna"];
if(name=="dha"){
var d="";
for(i=0;i<dha.length;i++){
d+="<option>"+dha[i]+"</option>";
}
tag=document.getElementById("district");
tag.innerHTML=d;
}else if(name=="chi"){
var d="";
for(i=0;i<chi.length;i++){
d+="<option>"+chi[i]+"</option>";
}
tag=document.getElementById("district");
tag.innerHTML=d;
}else if(name=="khu"){
var d="";
for(i=0;i<khu.length;i++){
d+="<option>"+khu[i]+"</option>";
}
tag=document.getElementById("district");
tag.innerHTML=d;
}
}
</script>
</head>
<body>
<select
onchange="getDistrictListByName(this.value,'district')">
<option value="dha">Dhaka</option>
<option value="chi">Chittagong</option>
<option value="khu">Khulna</option>
</select>
<select id="district"></select>
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