TechNote

Working with xfa.event.change in JavaScript (LiveCycle Designer)

Issue

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If you are working with xfa.event.newText and trying to limit the fields, as demonstrated in the following code, you will find that this will not work.

console.show();
console.println("new text is: " + xfa.event.newText);
console.println("old text is: " + xfa.event.prevText);
console.println("new text length: " + xfa.event.newText.toString().length);

if (xfa.event.newText.toString().length > 9)

{
console.println( "new text is longer than 9");
this.rawValue = xfa.event.prevText;
}

console.println("");

You may try to change:

this.rawValue = xfa.event.prevText

to

xfa.event.newText = xfa.event.prevText

but this will still not work to limit the TextField to 9 characters.

Solution

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Here is the working code, highlighting the code changes to make limiting the TextField to 9 characters work:

console.show();
console.println("new text is: " + xfa.event.newText);
console.println("old text is: " + xfa.event.prevText);
console.println("change is: " + xfa.event.change);
console.println("new text length: " + xfa.event.newText.toString().length); if (xfa.event.newText.toString().length > 9)
{
console.println("new text is longer than 9");
xfa.event.change = "";
} console.println("");

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