How to get all the values ​​of all select controls

wingking6

Such as the title: This is the code I wrote. The master shows me how to assign all the values ​​of the js script to the select control. I got it in the background, thanks.
<tr>
   <td align = "right" valign = "top"> <font color = # FF6600> * </ font> <b> </ b> Working place </ td>
   <td> <select name = "selloc1" size = "5" multiple id = "selloc1" runat = server style = "width: 160">
        <option value = '# 5 #'> Beijing / Beijing </ option
        </ select>
   </ td>
   <td> <INPUT TYPE = "BUTTON" NAME = "Input3" VALUE = "Add >>" OnClick = "JavaScript: additem (selloc1, selloc2)">
              <BR> <INPUT TYPE = "BUTTON" NAME = "Input22" VALUE = "<< Remove" OnClick = "JavaScript: delitem (selloc2)"> </ td>
   <td> <select name = "selloc2" size = "5" MULTIPLE id = "selloc2" style = "width: 160">
       </ select>
   </ td>
</ tr>

-------------------------- javascrip has been implemented without problems ------------------- ----
<script language = javascript>
<!-begin
function additem (sel1, sel2) {
  var flag;
  var count = 0;
  for (var x = 0; x <sel1.length; x ++) {
    var opt = sel1.options [x];
if (opt.selected) {
  count = count + 1;
      if (count> 5) {
  alert ("No more than 5 selected items!");
return;
  }
    }
  }
  if (count> 1&&sel1.options [0] .value == 0&&sel1.options [0] .selected) {
  alert ("You have selected [Unlimited] items, no other items can be selected!");
return;
  }

  for (var x = 0; x <sel1.length; x ++) {
    var opt = sel1.options [x];
    if (opt.selected) {
  flag = true;
  for (var y = 0; y <sel2.length; y ++) {
        var myopt = sel2.options [y];
        if (myopt.value == opt.value) {
          flag = false;
        }
else if (sel2.options [0] .value == 0) {
alert ("You have selected [Unlimited] items, no other items can be selected!");
return;
}
      }
      if (flag) {
if (sel1.options [0] .selected&&sel1.options [0] .value == 0) {
for (var x = sel2.length-1; x> = 0; x-) {
     sel2.options [x] = null;
    }
sel2.options [0] = new Option (opt.text, opt.value, 0, 0);
} else if (sel2.length> 4) {
  alert ("No more than 5 selected items!");
return;
    }

else {
sel2.options [sel2.options.length] = new Option (opt.text, opt.value, 0, 0);
}
      }
  
    }
  }

wingking6

Please elaborate, it is best to have an example.

夜夜莺歌

Write to a hidden control.

everever30

Add a control:
<input type = "hidden" id = "selectvalues" runat = "server" />

Save all selected values ​​to the above control with a script

document.getElementById ("selectvalues"). value = document.getElementById ("selloc2) .options.join (", ") /*option.value or text, take a look again * /

In the background:
string [] options = this.selectvalues.value.Split (",")
foreach (string option ...)

pyonus

Due to the nature of the select control, the value of the select is lost when you submit to refresh the page.
You can use a TextBox control to assign the value in the select control to the TextBox, so that the value of the TextBox can be read in the background.

zhouji700

Select all the values ​​of selloc2 before submitting, and then use Request.Form ["selloc2"] to get all the values ​​in the background
Here is the JS with all the values ​​of selloc2 selected:
for (i = 0; i <document.all.selloc2.length; i ++) document.all.selloc2 [i] .selected = true;

毛富利

3rd floor positive solution

xzq3916279

Top, 3rd floor positive solution