How to use required parameter in rich text display field?

Question

Hello Everyone, 
 I am using rich text display field to capture ranting from user. 
 I want that field to be required and i am not able to figure it out how to do that. 
 Your help will be appreciated. 
 Below is the code i am using. 
 a!richTextDisplayField( label: "Rating", value: { a!forEach( items: enumerate(ri!totalStars), expression: { a!richTextIcon( icon: if( fv!index <= ri!rating, "star", "star-o" ), link: a!dynamicLink( value: if(ri!rating=fv!index, 0, fv!index), saveInto: ri!rating ), linkstyle: cons!MMS_DG_LINK_STYLE[2], color: cons!MMS_DG_BOX_STYLE[2], size: cons!MMS_DG_LINK_SIZE[1] ) } ) } )

Shubham Aware · Answer

dilipg9160 Try this once a!localVariables(
 {
 a!richTextDisplayField(
 label: "Rating",
 value: {
 a!forEach(
 items: enumerate(ri!totalStars),
 expression: {
 a!richTextIcon(
 icon: if(fv!index <= ri!rating, "star", "star-o"),
 link: a!dynamicLink(
 value: if(ri!rating = fv!index, 0, fv!index),
 saveInto: ri!rating
 )
 )
 }
 )
 }
 ),
 a!richTextDisplayField(
 value: a!richTextItem(
 text: "Rating parameter must be filled, Please select a rating before submitting.",
 color: "NEGATIVE",
 style: "STRONG"
 ),
 showWhen: a!isNullOrEmpty(ri!rating),
 
 )
 }
)

Mike Schmitt · Answer

The Rich Text Display Field of course does not have a "required" parameter as it is, ostensibly, a read-only input. The fact that we can use links and differing stying and icons and fun stuff like that, in order to essentially transform Rich Text into an ad-hoc input, doesn't actually override the fact that no data is being inputted into the field , meaning there's nothing as easy as "use required parameter" to force the user into said action. 
 The above responses will work, though (through only a quick glance) it looks like those ad-hoc validations will show up immediately and continue showing up until the value is entered, but also won't prevent a button click like a normal failed validation would. This is where we can use a Section-level (or form-level) validation using a!validationMessage() , which has the unique ability to optionally be set to not evaluate its failure condition until Submit Click has been attempted by the user. 
 A portable example with local-only variables is attached: 
 a!localVariables(
 
 local!rating: tointeger(null()),
 local!totalStars: 7,

a!sectionLayout(
 contents: {
 a!richTextDisplayField(
 /*showWhen: a!isNotNullOrEmpty(local!rating),*/
 label: "Rating",
 value: {
 a!forEach(
 items: enumerate(local!totalStars)+1,
 expression: {
 a!richTextIcon(
 size: "MEDIUM",
 icon: if(
 or(fv!index > local!rating, a!isNullOrEmpty(local!rating)),
 "star-o",
 "star"
 ),
 link: a!dynamicLink(
 saveInto: {
 a!save(
 local!rating,
 if(fv!item = local!rating, tointeger(null()), fv!item)
 )
 }
 ),
 linkStyle: "STANDALONE"
 )
 }
 ),
 
 a!richTextItem(
 size: "SMALL",
 color: "NEGATIVE",
 text: {
 char(10),
 "(* Required)"
 }
 )
 }
 ),
 
 a!buttonArrayLayout(
 align: "CENTER",
 buttons: {
 a!buttonWidget(
 label: "SUBMIT",
 submit: true(),
 validate: true()
 )
 }
 )
 },
 
 validations: {
 a!validationMessage(
 message: "A rating is required.",
 showWhen: a!isNullOrEmpty(local!rating),
 validateAfter: "SUBMIT"
 )
 }
 )
)

DaisyManmohan5ingh · Answer

dilipg9160 One of the Approach would be to use Validation like as we will be storing the value at some place and By Default it will be null . 
 Hence on Click of Button we can find if its still null it will display an error else we will Proceed . 
 Normal if else will Take care of Such . 
 Another Approach would be to Disable the Button Until all the Values are not null .

David J (NTT DATA) · Answer

Try something like this. 
 
 a!localVariables(
{
a!richTextDisplayField(
 showWhen: a!isNotNullOrEmpty(ri!rating),
 label: "Rating",
 value: {
 a!forEach(
 items: enumerate(ri!totalStars),
 expression: {
 a!richTextIcon(
 icon: if(
 fv!index <= ri!rating,
 "star",
 "star-o"
 ),
 link: a!dynamicLink(
 value: if(ri!rating=fv!index, 0, fv!index),
 saveInto: ri!rating
 )
 
 )
 }
 )
 }
),
a!textField(
 showWhen: a!isNullOrEmpty(ri!rating),
 label: "Rating",
 value: "Rating parameter must be filled"
)
}
)

How to use required parameter in rich text display field?

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