Force selection of drop down

[suemo22]

Is there a way to force user to make a selection from a drop down before allowing them to move on to the next field?  Like it lights up red if selection not made?  I know in TurboTax, it won't let me do anything if I don't make a choice.  I want the field box to turn red and then an asterisk to come up telling user to make a selection.

I know how to do this by adding an app alert if the field is null but wanted to introduce a visual affect as well.

Thx.

Sue

[Joel_Geraci]

Trying to clarify...

If the user enters the dropdown field you want them to...

A) not be able to exit until they make a selection or

B) you want to allow them to exit but change the appearance of the dropdown field to indicate a value is required.

If A, you don't need B.

If B, you don't actually want A.

[suemo22]

Hi,

I guess A is the most simple so A.

I tried the following after the user clicks the okay button but nothing happens:

if ("ok" == cRtn)

{

      if (global.docNumAction.strExmp == null) //Ensure the document type is selected

      {

      app.alert (("Please select document type"))

      }

}

[suemo22]

I even tried adding .value but it seems it won't recognize a null value.  What am I doing wrong?  I want it to generate an app alert when there is no value in the strExmp field which starts of as "" and gets populated by drop down (if selected).  I want it notice thatno value was chosen from the drop down list and to alert the user.

if ("ok" == cRtn)

{

      if (global.docNumAction.strExmp.value == null) //Ensure the document type is selected

      {

      app.alert (("Please select document type. This field cannot be blank"))

      }

}

[Bernd Alheit]

What is the name of drop down field?

[suemo22]

The drop down field is named:

"LTyp": function(dialog)

        {

            var oRslt = dialog.store();

            var path = [];

            var cSel = ((this.GetListSel(oRslt["LTyp"],path))?path.reverse():"").toString();

            var oLabInfo = this.oDocNumParams[cSel];

            ...

        },

I just tried with LTyp == null and oLabInfo == null and no effect.

[suemo22]

Here's more:       

                                       {

                                            type: "view",

                                            align_children: "align_top",

                                            elements:

                                            [

                                              {

                                                    type: "static_text",

                                                    item_id: "sta3",

                                                    name: "1. Select Document Type:",

                                                },

                                                {

                                                    type: "popup",

                                                    item_id: "LTyp",

                                                    variable_Name: "strLTyp",

                                                    width: 93,

                                                    height: 23,

                                                    char_width: 8,

                                                },

[suemo22]

I am getting closer but now I am getting an app alert no matter if the drop down list has a selection or not.  I want it to only give me this error if the user has not made a selection from the drop down.  Any suggestions are welcome.

"LTyp": function(dialog)

        {

            var oRslt = dialog.store();

            var path = [];

            var cSel = ((this.GetListSel(oRslt["LTyp"],path))?path.reverse():"").toString();

            var oLabInfo = this.oDocNumParams[cSel];

            ...

          },

if ("ok" == cRtn)

{

       if(this.LTyp == null)  //Ensure the document type is selected

      {

      app.alert("Please select 'Document Type'. This field cannot be blank.")

      app.execDialog(global.DocNumAction);

      }