Expressions: Add an API to access a display text associated with any value rather than with the current question value

[andrewtelnov]

IMPLEMENTED

Since SurveyJS v1.11.8, the displayValue function supports a second parameter that can be used to get a display text associated with any question value. For instance, the following expression references a display text that corresponds to value 5 in a Dropdown question.

"expression": "displayValue('my-dropdown-question', 5)"

Documentation

---

You may need to get the display value based on value that are not set to the question. Please review the following JSON:

{
    elements: [
      {
        type: "checkbox",
        name: "q1",
        choices: [{ value: 1, text: "Item check 1" }, { value: 2, text: "Item check 2" }, { value: 3, text: "Item check 3" }]
      },
      {
        type: "dropdown",
        name: "q2",
        choices: [{ value: 1, text: "Item 1" }, { value: 2, text: "Item 2" }, { value: 3, text: "Item 3" }]
      },
      {
        type: "matrixdynamic",
        name: "matrix",
        columns: [
          { cellType: "text", name: "col1" },
          { cellType: "expression", name: "col2", expression: "displayValue('q1', {row.col1})" },
          { cellType: "expression", name: "col3", expression: "displayValue('q2', {row.col1})" }
        ]
      }
    ]
  }

The expressions values are based on row cell value & 'q1' and 'q2' settings.