Getting Javascript error - 'undefined is not an object'

Question

I am relatively new to working with scripts in InDesign and have been reading "InDesign CS5 Automation Using XML and Javascript" by Grant Gamble. There's a script I'm trying to execute to update a table in a publication, and I keep getting a Javascript error (Error number: 21 Error String: undefined is not an object) when it executes a function. The error dialog points to the line of code I've bolded below:

//

I appreciate any guidance on debugging it. Thank you!

SumitKumar · Accepted Answer

Hi @sanjayb75202732 ,

Error showing because you did not assign value to the variable.

updateTables();
function updateTables() {
    var doc = app.activeDocument;
    for (var i = 0; i < doc.pages.length; i++) {
        var currentPage = doc.pages[i];
        var currentFrame;
        if (currentPage.textFrames.length > 0 && (currentFrame = currentPage.textFrames[0]).tables.length > 0) {
            var tableCount = currentFrame.tables.length;
            if (tableCount > 0) {
                var currentTable = currentFrame.tables[0];
                var rowCount = currentTable.rows.length;
                var currentCuisine = currentFrame.paragraphs[0].contents.replace("\n", "");
                for (var j = 0; j < rowCount; j++) {
                    var currentRow = currentTable.rows[j];
                    var currentCourse = currentRow.cells[0].contents;
                    var currentKey = currentCuisine + currentCourse;
                    if (currentKey in g.objDates) {
                        currentRow.contents = g.objDates[currentKey];
                    }
                }
            }
        }
    }
}

m1b · Answer

You haven't set the variable currentFrame to anything. var currentPage declares a variable as undefined until you assign a value, eg.

currentFrame = currentPage.textFrames[0];
if (currentFrame.isValid) {
    // do something here
}

You can check the validity of currentPage and currentTable also.

- Mark

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