Node.js Requires Chilkat v11.7.0+

Fill a PDF Template: Replace {{placeholders}} with Values

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Demonstrates the TextReplace method on an invoice template whose values are written as placeholders such as {{customer}} and {{total}}. The "placeholders" object names each placeholder and the text to put in; every occurrence on the page is replaced, including a placeholder inside a sentence or inside a label such as "Tax ({{taxRate}}):". The text is redrawn with the font the template used, so the result looks like the template, and a value that is right-aligned in the template stays right-aligned. The changes are written by WriteFile. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  The PDF used in this example is available at invoice_template.pdf

    var pdf = new chilkat.Pdf();
    success = pdf.LoadFile("qa_data/pdf/invoice_template.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        return;
    }

    //  The template has these placeholders in its page text:
    //    {{customer}} (twice: "Bill To:" and the closing sentence), {{date}}, {{po}},
    //    two item rows: {{qty1}} {{desc1}} {{price1}} {{amount1}} and {{qty2}} {{desc2}} {{price2}} {{amount2}},
    //    {{subtotal}}, "Tax ({{taxRate}}):" with {{tax}}, and {{total}}.
    var json = new chilkat.JsonObject();
    json.UpdateString("placeholders.customer","Acme Corp");
    json.UpdateString("placeholders.date","2026-10-18");
    json.UpdateString("placeholders.po","PO-88213");
    json.UpdateString("placeholders.qty1","2");
    json.UpdateString("placeholders.desc1","Cordless drill, 18 V");
    json.UpdateString("placeholders.price1","$460.00");
    json.UpdateString("placeholders.amount1","$920.00");
    json.UpdateString("placeholders.qty2","6");
    json.UpdateString("placeholders.desc2","Galvanized hinge, 4 inch");
    json.UpdateString("placeholders.price2","$12.50");
    json.UpdateString("placeholders.amount2","$75.00");
    json.UpdateString("placeholders.subtotal","$995.00");
    json.UpdateString("placeholders.taxRate","7.35%");
    json.UpdateString("placeholders.tax","$73.13");
    json.UpdateString("placeholders.total","$1,068.13");

    //  "apply" makes every replacement, or none: if any value cannot be drawn with the
    //  template's font, the method returns false, the PDF is unchanged, and jsonOut says why.
    var jsonOut = new chilkat.JsonObject();
    success = pdf.TextReplace("apply",json,jsonOut);
    if (success == false) {
        console.log("Not applied: " + jsonOut.Emit());
        if (success == false) {
            console.log(pdf.LastErrorText);
            return;
        }

    }

    //  One entry per placeholder: the pages it was found on and how many times it was replaced.
    var i = 0;
    var count_i = jsonOut.SizeOfArray("replacements");
    while (i < count_i) {
        jsonOut.I = i;
        console.log(jsonOut.StringOf("replacements[i].field") + ": " + jsonOut.IntOf("replacements[i].count") + " on page(s) " + jsonOut.StringOf("replacements[i].pages"));
        i = i+1;
    }

    //  The replacements stay in memory until the PDF is written.
    success = pdf.WriteFile("qa_output/invoice_filled.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        return;
    }

    console.log("Wrote qa_output/invoice_filled.pdf");

    //  Sample output:

    //  customer: 2 on page(s) 1
    //  date: 1 on page(s) 1
    //  po: 1 on page(s) 1
    //  qty1: 1 on page(s) 1
    //  desc1: 1 on page(s) 1
    //  price1: 1 on page(s) 1
    //  amount1: 1 on page(s) 1
    //  qty2: 1 on page(s) 1
    //  desc2: 1 on page(s) 1
    //  price2: 1 on page(s) 1
    //  amount2: 1 on page(s) 1
    //  subtotal: 1 on page(s) 1
    //  taxRate: 1 on page(s) 1
    //  tax: 1 on page(s) 1
    //  total: 1 on page(s) 1
    //  Wrote qa_output/invoice_filled.pdf

}

chilkatExample();