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You can try to redefine the set_value method of the select:

scheduler.form_blocks.select.set_value = function(node,value,ev){

Alex,

  Thanks, that does work, although I am also trying to set the length of time automatically as well via using the value associated with a label.  Now the text is copied; I lose the setting of the end time.  I may just need to consolidate these routines.  My script follows if you have a change to look:

(function(){
   
   var end = null;
   var start = null;
   var mode = null;
   
   function set_end_time(){
    if (!mode.value) return;
    var time = scheduler.date.add((new Date(2000,1,1,0,start.value)),mode.value*1, "minute");
    end.value = time.getHours()*60+time.getMinutes();
   }
   
   var setter = scheduler.form_blocks.time.set_value;
   scheduler.form_blocks.time.set_value=function(node){
    var sels = node.getElementsByTagName("SELECT");
    
    start = sels[0];
    start.onchange=set_end_time;
    end = sels[4];
                                //Allow to free select time end
    //end.disabled=true;
    
    setter.apply(this,arguments);
    
    start.onchange();
   }
   
    var select = scheduler.form_blocks.select;
    scheduler.form_blocks.my_select = {
    get_value : select.get_value,
    set_value : function(node,value,ev){
   mode = node.firstChild;
   mode.value=value||"";
   mode.onchange=set_end_time;
   },
   render : select.render,
   focus : select.focus
   }
  })();

     //Add in selected procedure text into description field
     scheduler.form_blocks.my_select.set_value = function(node,value,ev){

    var txta = document.getElementsByTagName("textarea")[0];
    var selectEl = node.firstChild;
    selectEl.onchange = function(){
        var index = selectEl.selectedIndex;
        txta.value = selectEl.options[index].text;
    }
    node.firstChild.value=value||"";
}

For Setting the Value in TextArea We use,,,.................

var txta = document.getElementsByTagName("textarea")[0];
txta.value = selectEl.options[index].text;

but if I want to set the value in another Drop down...

then i am using,.....

 var txta = document.getElementsByTagName("select")[8];
    txta.innerHTML = "{key: sunday , label: Tomorrow}";

but this is not working...

can you tell me how i can set value in combo box...

Mahesh,

>> I lose the setting of the end time

There are two definitions of the set_value method of my_select object:

  scheduler.form_blocks.my_select = {
  get_value : select.get_value,
  set_value : function(node,value,ev){
...

and

  scheduler.form_blocks.my_select.set_value = function(node,value,ev){

Try to use one.

Amit,

The  txta.innerHTML = "{key: sunday , label: Tomorrow}"; code can't be applied to the select element. In order to set a value you can use the next method:

 var someSelect = document.getElementsByTagName("select")[8];
someSelect.value = "sunday";