C

Call a JavaScript Function Passing an Array Argument

See more JavaScript Examples

Demonstrates how to call a JavaScript function with an argument that is an array. C

#include <C_CkStringBuilder.h>
#include <C_CkJs.h>
#include <C_CkJsonObject.h>
#include <C_CkJsonArray.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkStringBuilder sbScript;
    HCkJs js;
    HCkJsonObject result;
    HCkJsonObject funcCall;
    HCkJsonArray argsArray;
    HCkJsonArray arg;
    HCkStringBuilder sbOut;

    success = FALSE;

    //  This is the JavaScript function we'll call:

    //  function calculateTotal(numbers) {
    //    console.log(numbers);
    //    let total = 0;
    //    
    //    // Loop through every number in the array
    //    for (const num of numbers) {
    //      console.log(num);
    //      total += num;
    //    }
    //    
    //    return total;
    //  }

    sbScript = CkStringBuilder_Create();
    success = CkStringBuilder_LoadFile(sbScript,"js_function_array_arg.js","utf-8");
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbScript));
        CkStringBuilder_Dispose(sbScript);
        return;
    }

    js = CkJs_Create();

    result = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(result,FALSE);

    //  Call Eval to add the function to the context's global object
    success = CkJs_Eval(js,sbScript,result);
    if (success == FALSE) {
        //  Examine the result for an exception.
        printf("%s\n",CkJsonObject_emit(result));

        //  Also examine the LastErrorText.
        printf("%s\n",CkJs_lastErrorText(js));
        CkStringBuilder_Dispose(sbScript);
        CkJs_Dispose(js);
        CkJsonObject_Dispose(result);
        return;
    }

    //  ------------------------------------------------------------------------------
    //  Call the function calculateTotal(numbers)

    funcCall = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(funcCall,FALSE);

    //  Create JSON specifying the function name and arguments
    //  In this case, there is only 1 argument, and it is an array.

    CkJsonObject_UpdateString(funcCall,"name","calculateTotal");

    //  Create the arguments array.
    argsArray = CkJsonArray_Create();

    //  The 1st argument in the arguments array is itself an array.
    //  Passing -1 indicates to append to the array.
    arg = CkJsonArray_Create();
    CkJsonArray_AddArrayAt2(argsArray,-1,arg);

    //  Fill in the values for the 1st argument.
    CkJsonArray_AddNumberAt(arg,-1,"10.50");
    CkJsonArray_AddNumberAt(arg,-1,"20.00");
    CkJsonArray_AddNumberAt(arg,-1,"5.25");

    //  Add the "args" array to the funcCall.
    CkJsonObject_AppendArrayCopy(funcCall,"args",argsArray);

    printf("%s\n",CkJsonObject_emit(funcCall));

    //  The funcCall is as follows.  Notice that the 1st (and only) argument is an array.

    //  {
    //    "name": "calculateTotal",
    //    "args": [
    //      [
    //        10.50,
    //        20.00,
    //        5.25
    //      ]
    //    ]
    //  }

    success = CkJs_CallFunction(js,funcCall,result);
    if (success == FALSE) {
        //  Examine the result for an exception.
        printf("%s\n",CkJsonObject_emit(result));

        //  Also examine the LastErrorText.
        printf("%s\n",CkJs_lastErrorText(js));
        CkStringBuilder_Dispose(sbScript);
        CkJs_Dispose(js);
        CkJsonObject_Dispose(result);
        CkJsonObject_Dispose(funcCall);
        CkJsonArray_Dispose(argsArray);
        CkJsonArray_Dispose(arg);
        return;
    }

    printf("%s\n",CkJsonObject_emit(result));

    //  Result:
    //  {
    //    "type": "double",
    //    "value": 35.75
    //  }

    //  The function also emitted text to the console.

    sbOut = CkStringBuilder_Create();
    CkJs_ConsoleOutputSb(js,sbOut);
    printf("%s\n",CkStringBuilder_getAsString(sbOut));

    //  Output:
    //  10.5,20,5.25
    //  10.5
    //  20
    //  5.25

    //  -----------------------------------------------------------
    //  Note: If the array argument is simple, this is an alternative
    //  and simpler way of creating the funcCall:

    CkJsonObject_Clear(funcCall);
    CkJsonObject_UpdateString(funcCall,"name","calculateTotal");
    CkJsonObject_UpdateNumber(funcCall,"args[0][0]","10.50");
    CkJsonObject_UpdateNumber(funcCall,"args[0][1]","20.00");
    CkJsonObject_UpdateNumber(funcCall,"args[0][2]","5.25");
    printf("%s\n",CkJsonObject_emit(funcCall));


    CkStringBuilder_Dispose(sbScript);
    CkJs_Dispose(js);
    CkJsonObject_Dispose(result);
    CkJsonObject_Dispose(funcCall);
    CkJsonArray_Dispose(argsArray);
    CkJsonArray_Dispose(arg);
    CkStringBuilder_Dispose(sbOut);

    }