如何設置從數據庫中選擇值的選擇選項？

Question

我已經創建了包含3個選項的註冊頁面和編輯頁面。在註冊用戶時，我將數據存儲在包含選擇選項值的數據庫中，當用戶單擊編輯頁面時，我可以使用從數據庫中獲取的數據填充文本字段，但我無法選擇選擇選項這是我從數據庫的代碼，我用來做此獲得的價值是：

的company變量店從數據庫

<select name="select-choice-a" id="select-choice-a" data-native-menu="false" data-theme="a"> 
    <option>Select Company</option> 
     <option value="standard">facebook</option> 
     <option value="rush">Linked In</option> 
     <option value="express">Skype</option> 
     <option value="overnight">Twitter</option> 
    </select> 

期權價值的數據的JavaScript

function fetchdetails(){ 
db.transaction(function(tx){ 
    tx.executeSql(select_details,[ids,nam1],function(tx,results){ 
     for(var i=0;i<results.rows.length;i++){ 
     first_name=results.rows.item(i).frist_name; 
     last_name=results.rows.item(i).last_name; 
     company=results.rows.item(i).company; 
     title=results.rows.item(i).title; 
     industry=results.rows.item(i).industry; 
     owner=results.rows.item(i).owner; 
     email=results.rows.item(i).email; 
     landline=results.rows.item(i).landline; 
     mobile_no=results.rows.item(i).mobile; 
     fax_no=results.rows.item(i).fax_no; 
     website=results.rows.item(i).website; 
     street=results.rows.item(i).street_name; 
     city=results.rows.item(i).city; 
     region=results.rows.item(i).region; 
     pincode=results.rows.item(i).pincode; 
     country=results.rows.item(i).country; 
     linkedin=results.rows.item(i).linkedin_link; 
     twitter=results.rows.item(i).twitter_link; 
     facebook=results.rows.item(i).facebook_link; 
     skype=results.rows.item(i).skype_link; 
     additionalinfo=results.rows.item(i).additional_info; 

     } 
    }); 
}); 
} 

var index=''; 
var x=document.getElementById('select-choice-a'); 
alert(x.options.length); 
for(var i=0;i<x.options.length;i++){ 
    if(x.options[i].value===company) 
     { 
     alert("I am in select option"); 
     index=i; 
     alert("index of select-choice-a"+index); 
     break; 
     } 
} 
x.options[index].selected=true; 

Answer 1

更換你的代碼

var index=''; 
var x=document.getElementById('select-choice-a'); 
alert(x.options.length); 
for(var i=0;i<x.options.length;i++){ 
    if(x.options[i].value===company) 
     { 
     alert("I am in select option"); 
     index=i; 
     alert("index of select-choice-a"+Index); 
     break; 
     } 
} 
x.options[index].selected=true; 

與

<script type="text/javascript"> 
var company=''; 
fetchdetails(); 
var x=document.getElementById('select-choice-a'); 
var index=0; 
for(var i=0;i<x.options.length;i++){ 
    if(x.options[i].value===company) 
     { 
     alert("I am in select option"); 
     index=i; 
     alert("index of select-choice-a"+index); 
     break; 
     } 
} 
x.options[index].selected=true; 
</script>