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Version: v10.15

Using JavaScript in Binding

This How To:

  • Showcases how to use the Binding Dialog Use Expressions tab to code JS expressions like
    • Concat
    • Arithmetic expressions
    • Comparison/logical expressions
  • How to create a JavaScript functions to return value of expressions
  • Use Date, String functions, Group by month/year

How-to Concatenate Strings using JS Functions and Use Expressions Tab​

Using Logical Expressions in JS Tab​

Using Date, Month Expression in JavaScript​

Following Date and Picture formats are used:

Using various predefined functions in JS​

Here we will showcase:

  • Concat and to Uppercase Functions in String.
// Function for Validating if input is only string, If yes Concat and convert to UpperCase
Page.Convertor = function (x, y) {
    if (isNaN(x) && isNaN(y)) {
        return (x.concat(" ").concat(y)).toUpperCase();
    } else {
        return "Please Enter Only Strings";
    }
};

Page.buttonConvertClick = function ($event, widget) {
    //Setting output to Static Variable
    Page.Widgets.labelOutput.caption = Convertor(Page.Widgets.textString1.datavalue, Page.Widgets.textString2.datavalue);
    // Setting Show property of the output label as true as default was false
    Page.Widgets.labelOutput.show = true;
};
note

In case the JavaScript function is declared in the app.js file, use the App scope:

Page.buttonConvertClick = function ($event, widget) {
    //Setting output to Static Variable
    Page.Widgets.labelOutput.caption = App.Convertor(Page.Widgets.textString1.datavalue, 
                                                        Page.Widgets.textString2.datavalue);
    // Setting Show property of the output label as true as default was false
    Page.Widgets.labelOutput.show = true;
};
  • Instead of the button click event, you can invoke the JS function from the Use Expression option of the bind dialog for the Label caption property: