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ComboBox - Validate so default value is not selected
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One of the things that I've been trying to get to work in XPages is getting validation to reject the default value of a combobox. Well, this morning I sat down and decided to get it done. I've used other methods to get around this until now, but this seems to do it.

I have a combobox with "--Select--" as the default value. If that value is still there on submission, I want a display error control to execute. To do this, I think you need to have "--Select--" as the itemValue as well as the itemLabel, but I'm not sure, as I habitually use both anyway.

Add a validateContraint, and use the RegEx "^((?!--Select--).)*$" , I got this from this StackOverflow Post. So on submission, if a value hasn't been selected (errm, sorry) no dice.

I tested on a combobox that needed the user to select the month, the entire element is below.

There may be a better way, but having this will be a relief for me.

Cheers,
Brian
                    <xp:comboBox
                        id="comboBox1"
                        value="#{document1.rptCover}"
                        style="width:125.0px"
                        defaultValue="--Select--">

                        <xp:this.validators>                           
                            <xp:validateConstraint
                                regex="^((?!--Select--).)*$"
                                message="Select a month">
                            </xp:validateConstraint>
                        </xp:this.validators>
                        <xp:selectItem
                            itemLabel="--Select--"
                            id="selectItem15" itemValue="--Select--"/>

                        <xp:selectItem
                            itemLabel="January"
                            itemValue="January"
                            id="selectItem1" />

                        <xp:selectItem
                            itemLabel="February"
                            itemValue="February"
                            id="selectItem2" />

                        <xp:selectItem
                            itemLabel="March"
                            itemValue="March"
                            id="selectItem3" />

                        <xp:selectItem
                            itemLabel="April"
                            itemValue="April"
                            id="selectItem4" />

                        <xp:selectItem
                            itemLabel="May"
                            itemValue="May"
                            id="selectItem5" />

                        <xp:selectItem
                            itemLabel="June"
                            itemValue="June"
                            id="selectItem6" />

                        <xp:selectItem
                            itemLabel="July"
                            itemValue="July"
                            id="selectItem7" />

                        <xp:selectItem
                            itemLabel="August"
                            itemValue="August"
                            id="selectItem8" />

                        <xp:selectItem
                            itemLabel="September"
                            itemValue="September"
                            id="selectItem9" />

                        <xp:selectItem
                            itemLabel="October"
                            itemValue="October"
                            id="selectItem10" />

                        <xp:selectItem
                            itemLabel="November"
                            itemValue="November"
                            id="selectItem11" />

                        <xp:selectItem
                            itemLabel="December"
                            itemValue="December"
                            id="selectItem12" />
                    </xp:comboBox>


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http://dominoherald.blogspot.com/2015/07/combobox-validate-so-default-value-is.html
Jul 01, 2015
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