Set PHTML ComboBox Selected Value in JavaScript?

Question

I've created a combobox as follows:
<phtmlb:comboBox id                = "sdm_cnis"
  selection        = "<%= L_CIP_DETAILS_WA-GBSCIND %>"
   table             = "<%= l_cnis %>"
   readOnly       = "<%= l_display_mode %>"
   width             = "50px"
   nameOfKeyColumn   = "VALUE"
   nameOfValueColumn = "NAME"
   onClientSelect    = "javascript:sdm_toggle_required();return false;"
   behavior          = "DROPDOWNSELECT" />
Based on the selected value of another dropdown combobox, I want to use JavaScript to select the value of this comboBox. For example, if the user changes the first comboBox, I want to automatically select the first option in this combobox. I really do not want to use dropdownListBoxes because they are not used anywhere else in our application. I also do not want to make a round trip to the server in order to resolve this issue as our uses will complain too much about that.
Some other things I've learned/tried:
I know I can get the selected value as follows:
sapUrMapi_ComboBox_getSelectedKey('sdm_cnis');
I have also tried to do the following, which sort of sets the value, but when you pull the list it appears as though the old selected value is still selected:
window.document.getElementById('sdm_cnisKEY').value = cnis_key;
window.document.getElementById('sdm_cnis').value = cnis_value;
Any help is appreciated.
Rick

Answer 1

Managed to come up with a solution:
window.document.getElementById('sdm_cnisKEY').value = cnis_key;
window.document.getElementById('sdm_cnis').value = cnis_value;
var o=sapUrMapi_ComboBox_getObject("sdm_cnis");
o.txt.setAttribute("k",cnis_key);
o.txt.setAttribute("ks",cnis_key);
I'm not sure, but I would imagine that this solution is not supported by SAP and any patches or service pack upgrades could potentially break the code, so if you use it, be cautioned about this.
I have tested it on our server, and it works for my current scenario. That said, if there is a better way to do this in JavaScript, I'd love to hear it. For now, I'll leave the question open and assign full points if someone can come up with something that I feel is better than this (i.e. a JavaScript solution that is supported by SAP).
Rick