ReferenceError: label is not defined in Dymo framework

Question

I am playing with Dymo's JS framework. The original example works without issue, but it's loading the XML even when I don't want to click. I rewrited to execute Dymo code only when I call it:

<script type="text/javascript">
       function printnow() {              
               $.get("./cont.label", function(labelXml) {
               label = dymo.label.framework.openLabelXml(labelXml);
               }, "text");
               // open label
               // set label text
               label.setObjectText("MENO", "test");
               label.setObjectText("MUNKA", "test");
               label.setObjectText("DESCRIPTION", test);
               // select printer to print on
               // for simplicity sake just use the first LabelWriter printer
               var printers = dymo.label.framework.getPrinters();
               if (printers.length == 0) throw "No DYMO printers are installed. Install DYMO printers.";
               var printerName = "";
               for (var i = 0; i < printers.length; ++i) {
                   var printer = printers[i];
                   if (printer.printerType == "LabelWriterPrinter") {
                       printerName = printer.name;
                       break;
                   }
               }
               if (printerName == "") throw "No LabelWriter printers found. Install LabelWriter printer";
               // finally print the label
               label.print(printerName);

       };
</script>

Unfortunately after I call printnow(); I get ReferenceError: label is not defined Where is the problem?

http://stackoverflow.com/questions/14220321/how-to-return-the-response-from-an-asynchronous-call/14220323?s=1|0.0000#14220323 — , Oct 11 '15 at 13:34
That `$.get()` call is **asynchronous**. The variable `label` won't get a value until the HTTP call completes, but the `$.get()` call itself returns immediately. Put the code that prepares and prints the content **inside** the callback. — Pointy, Oct 11 '15 at 13:37

score 1 · Accepted Answer · edited May 23 '17 at 11:51

First you have to read this one.

In short, you are dealing with async code. So, this label.setObjectText("MENO", "test"); and the rest of the code gets executed, before this label = dymo.label.framework.openLabelXml(labelXml); line.

Finally, you have to do something like this:

<script type="text/javascript">
       function printnow() {              
               $.get("./cont.label", function(labelXml) {
               var label = dymo.label.framework.openLabelXml(labelXml);
               // open label
               // set label text
               label.setObjectText("MENO", "test");
               label.setObjectText("MUNKA", "test");
               label.setObjectText("DESCRIPTION", test);
               // select printer to print on
               // for simplicity sake just use the first LabelWriter printer
               var printers = dymo.label.framework.getPrinters();
               if (printers.length == 0) throw "No DYMO printers are installed. Install DYMO printers.";
               var printerName = "";
               for (var i = 0; i < printers.length; ++i) {
                   var printer = printers[i];
                   if (printer.printerType == "LabelWriterPrinter") {
                       printerName = printer.name;
                       break;
                   }
               }
               if (printerName == "") throw "No LabelWriter printers found. Install LabelWriter printer";
               // finally print the label
               label.print(printerName);

               }, "text");

       };
</script>

ReferenceError: label is not defined in Dymo framework

1 Answers1