如何訪問代碼隱藏控件的值，這是由javascript動態創建的

Question

如何訪問由JavaScript動態創建的控件（在CodeBehind中）的值？

我創建控件動態使用下面的代碼：

var counter = 0; 
var words; 
var foo;//span tag 

function add(i) { 
    var counter = 0; 
    var words; 
    var foo;//span tag asp in page where the controls to be added 

    if (i == 'ad') { 
     counter++; 
     //Create an input type dynamically. 
     foo = document.getElementById("dynamic") 
     tbnam = document.createElement("input") //textbox 
     tbdes = document.createElement("input") //textbox 
     lbnam = document.createElement("Label") 
     lbdes = document.createElement("Label") 
     before = document.createElement('br') 
     after = document.createElement('br') 

     //Assign different attributes to the element. 
     wordsnam = document.createTextNode("Item") 
     wordsdes = document.createTextNode("Descrip") 
     tbnam.setAttribute("type", "TextBox"); 
     tbdes.setAttribute("type", "TextBox"); 
     tbnam.setAttribute("Id", "tbdynamicnam" + counter); 
     tbdes.setAttribute("Id", "tbdynamicdes" + counter); 
     lbnam.setAttribute("Id", "lbdynamicnam" + counter); 
     lbdes.setAttribute("Id", "lbdynamicdes" + counter); 
     before.setAttribute("Id", "bf" + counter); 
     after.setAttribute("Id", "af" + counter); 

     lbnam.appendChild(wordsnam) 
     lbdes.appendChild(wordsdes) 

     //Append the element in page (in span). 

     foo.appendChild(before); 
     foo.appendChild(lbnam); 
     foo.appendChild(tbnam); 
     foo.appendChild(lbdes); 
     foo.appendChild(tbdes); 
     foo.appendChild(after);    
    } 
} 

Answer 1

當提交表單時它會在Request.Form collection，您可以訪問它Request對象，這將檢查所有藏品最簡單的（查詢字符串，表單，Cookie和ServerVariables）

的JavaScript：

tbnam = document.createElement("input") //textbox  
tbnam.setAttribute("type", "TextBox");  
tbnam.setAttribute("Id", "tbdynamicnam" + counter); 
tbnam.setAttribute("name", "tbdynamicnam" + counter); 

代碼隱藏：

string newval = Request["newelementname"]; 

正如James Montagne下文提到的，你需要一個表單元素名稱。