Tcl

Call a JavaScript Function Returning an Array

See more JavaScript Examples

Demonstrates how to call a JavaScript function that returns an array. Tcl

load ./chilkat.dll

set success 0

#  ----------------------------------------------------------------------------------
#  The Javascript functions called in this example are shown at the bottom of this page.
#  -----------------------------------------------------------------------------------

set sbScript [new_CkStringBuilder]

set success [CkStringBuilder_LoadFile $sbScript "js_function_returning_array.js" "utf-8"]
if {$success == 0} then {
    puts [CkStringBuilder_lastErrorText $sbScript]
    delete_CkStringBuilder $sbScript
    exit
}

set js [new_CkJs]

set result [new_CkJsonObject]

CkJsonObject_put_EmitCompact $result 0

#  Call Eval to add the function to the context's global object
set success [CkJs_Eval $js $sbScript $result]
if {$success == 0} then {
    #  Examine the result for an exception.
    puts [CkJsonObject_emit $result]

    #  Also examine the LastErrorText.
    puts [CkJs_lastErrorText $js]
    delete_CkStringBuilder $sbScript
    delete_CkJs $js
    delete_CkJsonObject $result
    exit
}

#  ------------------------------------------------------------------------------
#  Call each function

set funcCall [new_CkJsonObject]

#  Create JSON specifying the function name and arguments
#  The function has no arguments, so we only specify the name.

CkJsonObject_UpdateString $funcCall "name" "getDays"

set success [CkJs_CallFunction $js $funcCall $result]
if {$success == 0} then {
    #  Examine the result for an exception.
    puts [CkJsonObject_emit $result]

    #  Also examine the LastErrorText.
    puts [CkJs_lastErrorText $js]
    delete_CkStringBuilder $sbScript
    delete_CkJs $js
    delete_CkJsonObject $result
    delete_CkJsonObject $funcCall
    exit
}

puts [CkJsonObject_emit $result]

#  Output:
#  {
#    "type": "array",
#    "value": [
#      "Monday",
#      "Tuesday",
#      "Wednesday",
#      "Thursday",
#      "Friday"
#    ]
#  }

#  Access each array value..
set count [CkJsonObject_SizeOfArray $result "value"]
set i 0
while {$i < $count} {
    CkJsonObject_put_I $result $i
    puts [CkJsonObject_stringOf $result {value[i]}]
    set i [expr $i + 1]
}

#  ------------------------------------------------------------------------------
#  Call the getRange(start,end) function

CkJsonObject_Clear $funcCall
CkJsonObject_UpdateString $funcCall "name" "getRange"
CkJsonObject_UpdateInt $funcCall "args[0]" 14
CkJsonObject_UpdateInt $funcCall "args[1]" 21
set success [CkJs_CallFunction $js $funcCall $result]
puts [CkJsonObject_emit $result]

#  Output:
#  {
#    "type": "array",
#    "value": [
#      14,
#      15,
#      16,
#      17,
#      18,
#      19,
#      20,
#      21
#    ]
#  }

set count [CkJsonObject_SizeOfArray $result "value"]
set i 0
while {$i < $count} {
    CkJsonObject_put_I $result $i
    puts [CkJsonObject_IntOf $result {value[i]}]
    set i [expr $i + 1]
}

#  ------------------------------------------------------------------------------
#  Call the getEmployees() function

CkJsonObject_Clear $funcCall
CkJsonObject_UpdateString $funcCall "name" "getEmployees"
set success [CkJs_CallFunction $js $funcCall $result]
puts [CkJsonObject_emit $result]

#  Output:
#  {
#    "type": "array",
#    "value": [
#      {
#        "id": 101,
#        "name": "Alice",
#        "role": "Dev"
#      },
#      {
#        "id": 102,
#        "name": "Bob",
#        "role": "Manager"
#      }
#    ]
#  }

set count [CkJsonObject_SizeOfArray $result "value"]
set i 0
while {$i < $count} {
    CkJsonObject_put_I $result $i
    puts "name: [CkJsonObject_stringOf $result {value[i].name}]"
    puts "role: [CkJsonObject_stringOf $result {value[i].role}]"
    puts "id: [CkJsonObject_IntOf $result {value[i].id}]"
    puts ""
    set i [expr $i + 1]
}

delete_CkStringBuilder $sbScript
delete_CkJs $js
delete_CkJsonObject $result
delete_CkJsonObject $funcCall

JavaScript

function getDays() {
    return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
}

function getRange(start, end) {
    var arr = [];
    for (var i = start; i <= end; i++) {
        arr.push(i);
    }
    return arr;
}
// Usage: getRange(1, 5) -> [1, 2, 3, 4, 5]

function getEmployees() {
    return [
        { id: 101, name: "Alice", role: "Dev" },
        { id: 102, name: "Bob", role: "Manager" }
    ];
}