[Interest] Accessing a QML object, via constructed id in JavaScript

[Alan Alpert]

You can't locate objects by id strings (unless you are in a context
where you could just use the id instead of eval anyways). If you want
to pass around a reference to an object, you can do
"var theCheckBox = english_weight1"
somewhere where the english_weight1 id is accessible. Then you can
pass it to where-ever you need it and use it like
"if (theCheckBox.checked) //do something"

--
Alan Alpert

On Mon, Apr 14, 2014 at 9:50 PM, Eric Feigenson <eric at feigenson.net> wrote:
> Hello all...
>
> I'm writing some JavaScript code inside QML.  What I'd like to do is be able
> to access an object via id where the id is in a JavaScript string.
>
> For example, given the QML:
>
>         CheckBox {
>
>             id: english_weight1
>
>             text: qsTr("2.5 lb")
>
>         }
>
>
> and the JavaScript fragment:
>
>         var idName = "english_weight1";
>
>         if (idName.checked)
>
>             // do something is the box is checked...
>
>
> But I want the idName in the "if" statement to refer to the value of the
> JavaScript variable "idName", in other words,
> "english_weight1.checked". I believe I could use eval:
>
>         if (eval(idname + ".checked")) ...
>
>
> but everything I've read says eval is to be avoided.
>
> If it helps or makes any difference, the CheckBox is in a Column with id
> myColumn.  I was thinking something like
> myColumn[idName] would do the trick, but I'm only guessing.
>
> I hope this is a clear enough description... please let me know if any more
> details are needed.
>
> Any thoughts?
>
> Thanks!
>
> -Eric
>
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