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hema.mathivathanan
Certified Associate Developer

In the interface. I am getting error message for the below piece of code. 

Error message :

Expression evaluation error in rule 'sshs_startformquestions' at function a!cardLayout [line 48]: Cannot compare incompatible operands of type Null and type Number (Integer).

Line: showWhen: {
local!selected1 = 2
}

It would be great if someone can help. 

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Parents
  • +1
    Certified Senior Developer

    There are two Possibilities of why you see the error,

    1. Either your Local variable local!selected1 has no value,

    if it is giving this message as soon as you write the code, may be you can do a null check for your showWhen. Lets say if-isnullorempty-{}-your condition.

    2. It has a non integer value. If you are fetching or indexing it from somewhere else, may be you can wrap it in the tointeger() function. 

  • 0
    Certified Associate Developer
     in reply to Konduru Chaitanya

    Thanks for your reply. I have 3 local variables defined. It would be great if you can help here on how to use the isnullorempty condition
    showWhen: and(
    local!selected1 =1,
    local!selected2=2
    )

  • 0
    Certified Senior Developer
     in reply to hema.mathivathanan

    Hello ,

    Can you please share your code? It would be more clear in order to provide an answer.

  • 0
    Certified Associate Developer
     in reply to Konduru Chaitanya 

    a!localVariables(
  local!selected1,
  local!selected2,
  local!selected3,
  {
    a!richTextDisplayField(
      value: {
        a!richTextItem(
          text: "Please answer the below question(s)",
          style: "PLAIN"
        )
      }
    ),
    a!radioButtonField(
      label: "1.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected1,
      saveInto: local!selected1,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: {
""
              },
              link: a!safeLink(
                label: "Appian Hardware Sizing methods",
                openLinkIn: "SAME_TAB"
              ),
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      showWhen:if(
        a!isNullOrEmpty(
          local!selected1),null,local!selected1 = 2
        )
      
      /*showWhen: local!selected1=2,*/
      ),
      
         a!radioButtonField(
      label: "2",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected2,
      saveInto: local!selected2,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen:if(
        a!isNullOrEmpty(
          local!selected1),null,local!selected1 = 1
      )
      
      /*showWhen: local!selected1 =1*/
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: {
                "document",
                
              },
              link: a!documentDownloadLink(document: 2354149, ),
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      /*showWhen: if(*/
       /*a!isNullOrEmpty(local!selected1),null, */
/**/
       /*local!selected1=1*/
/*)*/
      
      showWhen: and(
        local!selected1 =1, 
        local!selected2=2
      )
    ),
    a!radioButtonField(
      label: "3.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected3,
      saveInto: local!selected3,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen: {
        and(local!selected2 = 1, local!selected1 = 1)
      }
      
     
    ),
    /*a!cardLayout(*/
      /*contents: {*/
        /*a!richTextDisplayField(*/
          /*value: {*/
            /*a!richTextItem(*/
              /*text: {*/
                /*"document",*/
/*                */
              /*},*/
              /*link: a!documentDownloadLink(document: 2354149, ),*/
              /*linkstyle: "STANDALONE"*/
            /*)*/
          /*}*/
        /*),*/
/*        */
      /*},*/
      /*style: "INFO",*/
      /*showBorder: false,*/
      /*showWhen: {*/
        /*and(*/
          /*local!selected1 = 1,*/
          /*local!selected2 = 1,*/
          /*local!selected3 = 1*/
        /*)*/
      /*}*/
    /*),*/
    /*a!cardLayout(*/
      /*contents: {*/
        /*a!richTextDisplayField(*/
          /*value: {*/
            /*a!richTextItem(*/
              /*text: {*/
                /*" ocument",*/
/*                */
              /*},*/
              /*link: a!documentDownloadLink(document: 2354149, ),*/
              /*linkstyle: "STANDALONE"*/
            /*)*/
          /*}*/
        /*),*/
/*        */
      /*},*/
      /*style: "INFO",*/
      /*showBorder: false,*/
      /*showWhen: {*/
        /*and(*/
          /*local!selected1 = 1,*/
          /*local!selected2 = 1,*/
          /*local!selected3 = 2*/
        /*)*/
      /*}*/
    /*),*/
/*    */
  },
  
)

  • 0
    Certified Associate Developer
     in reply to Konduru Chaitanya 

    a!localVariables(
  local!selected1,
  local!selected2,
  local!selected3,
  {
    a!richTextDisplayField(
      value: {
        a!richTextItem(
          text: "",
          style: "PLAIN"
        )
      }
    ),
    a!radioButtonField(
      label: "1",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected1,
      saveInto: local!selected1,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: {
                "document",
                
              },
              link: a!safeLink(
                label: " methods",
                openLinkIn: "SAME_TAB"
              ),
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      showWhen:if(
        a!isNullOrEmpty(
          local!selected1),null,local!selected1 = 2
        )
      
      /*showWhen: local!selected1=2,*/
      ),
      
         a!radioButtonField(
      label: "2.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected2,
      saveInto: local!selected2,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen:if(
        a!isNullOrEmpty(
          local!selected1),null,local!selected1 = 1
      )
      
      /*showWhen: local!selected1 =1*/
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: {
                " document",
                
              },
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      /*showWhen: if(*/
       /*a!isNullOrEmpty(local!selected1),null, */
/**/
       /*local!selected1=1*/
/*)*/
      
      showWhen: and(
        local!selected1 =1, 
        local!selected2=2
      )
      

      
      

      
    ),
    a!radioButtonField(
      label: "3.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected3,
      saveInto: local!selected3,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen: {
        and(local!selected2 = 1, local!selected1 = 1)
      }
      
     
    ),
   
    /*a!cardLayout(*/
      /*contents: {*/
        /*a!richTextDisplayField(*/
          /*value: {*/
            /*a!richTextItem(*/
              /*text: {*/
                /*" document",*/
/*                */
              /*},*/
              /*linkstyle: "STANDALONE"*/
            /*)*/
          /*}*/
        /*),*/
/*        */
      /*},*/
      /*style: "INFO",*/
      /*showBorder: false,*/
      /*showWhen: {*/
        /*and(*/
          /*local!selected1 = 1,*/
          /*local!selected2 = 1,*/
          /*local!selected3 = 2*/
        /*)*/
      /*}*/
    /*),*/
/*    */
  },
  
)
    This is the code.

  • +1
    Certified Senior Developer
     in reply to hema.mathivathanan 

    a!localVariables(
  local!selected1,
  local!selected2,
  local!selected3,
  {
    a!richTextDisplayField(
      value: { a!richTextItem(text: "", style: "PLAIN") }
    ),
    a!radioButtonField(
      label: "1",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected1,
      saveInto: local!selected1,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: { "document",  },
              link: a!safeLink(label: " methods", openLinkIn: "SAME_TAB"),
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      showWhen: if(
        a!isNullOrEmpty(local!selected1),
        {},
        local!selected1 = 2
      )/*showWhen: local!selected1=2,*/
      
    ),
    a!radioButtonField(
      label: "2.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected2,
      saveInto: local!selected2,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen: if(
        a!isNullOrEmpty(local!selected1),
        null,
        local!selected1 = 1
      )/*showWhen: local!selected1 =1*/
      
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: { " document",  },
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      /*showWhen: if(*/
      /*a!isNullOrEmpty(local!selected1),null, */
      /**/
      /*local!selected1=1*/
      /*)*/
      showWhen: if(
        and(
          a!isNotNullOrEmpty(local!selected1),
          a!isNotNullOrEmpty(local!selected2)
        ),
        and(local!selected1 = 1, local!selected2 = 2),
        {}
      )
    ),
    a!radioButtonField(
      label: "3.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected3,
      saveInto: local!selected3,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen: {
        if(
          and(
            a!isNullOrEmpty(local!selected1),
            a!isNullOrEmpty(local!selected2)
          ),
          {},
          and(
            tointeger(local!selected2) = 1,
            tointeger(local!selected1) = 1
          )
        )
      }
    ),
    /*a!cardLayout(*/
    /*contents: {*/
    /*a!richTextDisplayField(*/
    /*value: {*/
    /*a!richTextItem(*/
    /*text: {*/
    /*" document",*/
    /*                */
    /*},*/
    /*linkstyle: "STANDALONE"*/
    /*)*/
    /*}*/
    /*),*/
    /*        */
    /*},*/
    /*style: "INFO",*/
    /*showBorder: false,*/
    /*showWhen: {*/
    /*and(*/
    /*local!selected1 = 1,*/
    /*local!selected2 = 1,*/
    /*local!selected3 = 2*/
    /*)*/
    /*}*/
    /*),*/
    /*    */
    
  },
  
)

    Just few changes in the show When. You can also create an expression rule and call it multiple places avoiding typing of same code lines with different values.

    When there is no value in your Local variable it will not be able to determine the type. hence the error. 

Reply
  • +1
    Certified Senior Developer
     in reply to hema.mathivathanan 

    a!localVariables(
  local!selected1,
  local!selected2,
  local!selected3,
  {
    a!richTextDisplayField(
      value: { a!richTextItem(text: "", style: "PLAIN") }
    ),
    a!radioButtonField(
      label: "1",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected1,
      saveInto: local!selected1,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: { "document",  },
              link: a!safeLink(label: " methods", openLinkIn: "SAME_TAB"),
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      showWhen: if(
        a!isNullOrEmpty(local!selected1),
        {},
        local!selected1 = 2
      )/*showWhen: local!selected1=2,*/
      
    ),
    a!radioButtonField(
      label: "2.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected2,
      saveInto: local!selected2,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen: if(
        a!isNullOrEmpty(local!selected1),
        null,
        local!selected1 = 1
      )/*showWhen: local!selected1 =1*/
      
    ),
    a!cardLayout(
      contents: {
        a!richTextDisplayField(
          value: {
            a!richTextItem(
              text: { " document",  },
              linkstyle: "STANDALONE"
            )
          }
        ),
        
      },
      style: "INFO",
      showBorder: false,
      /*showWhen: if(*/
      /*a!isNullOrEmpty(local!selected1),null, */
      /**/
      /*local!selected1=1*/
      /*)*/
      showWhen: if(
        and(
          a!isNotNullOrEmpty(local!selected1),
          a!isNotNullOrEmpty(local!selected2)
        ),
        and(local!selected1 = 1, local!selected2 = 2),
        {}
      )
    ),
    a!radioButtonField(
      label: "3.",
      labelPosition: "ABOVE",
      choiceLabels: { "Yes", "No" },
      choiceValues: { 1, 2 },
      value: local!selected3,
      saveInto: local!selected3,
      choiceLayout: "COMPACT",
      choiceStyle: "STANDARD",
      required: true,
      showWhen: {
        if(
          and(
            a!isNullOrEmpty(local!selected1),
            a!isNullOrEmpty(local!selected2)
          ),
          {},
          and(
            tointeger(local!selected2) = 1,
            tointeger(local!selected1) = 1
          )
        )
      }
    ),
    /*a!cardLayout(*/
    /*contents: {*/
    /*a!richTextDisplayField(*/
    /*value: {*/
    /*a!richTextItem(*/
    /*text: {*/
    /*" document",*/
    /*                */
    /*},*/
    /*linkstyle: "STANDALONE"*/
    /*)*/
    /*}*/
    /*),*/
    /*        */
    /*},*/
    /*style: "INFO",*/
    /*showBorder: false,*/
    /*showWhen: {*/
    /*and(*/
    /*local!selected1 = 1,*/
    /*local!selected2 = 1,*/
    /*local!selected3 = 2*/
    /*)*/
    /*}*/
    /*),*/
    /*    */
    
  },
  
)

    Just few changes in the show When. You can also create an expression rule and call it multiple places avoiding typing of same code lines with different values.

    When there is no value in your Local variable it will not be able to determine the type. hence the error. 

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