Dynamically construct embedded data field name with loop and merge index

andrew_reece · 2018-08-11T08:42:04+00:00

Is it possible to access an embedded data field in Javascript when dynamically constructing its field name? For example, let's say the field I want is `result.elements.0.embeddedData.V1`, but I only know the last character should be `1` at runtime (the number is drawn from a loop & merge index). I want to do something like: var n = "${lm://CurrentLoopNumber}"; // ex. n = 1 var ed = eval("${e://Field/result.elements.0.embeddedData.V"+n.toString()+"}"); But this doesn't work, `ed` just comes up `null`. (Sanity check: `console.log("${e://Field/result.elements.0.embeddedData.V1}");` does produce the value I'm expecting.) I imagine this is because of the order of operations somehow (either that or `eval()` can't execute `$` syntax?) It seems like by the time my string concatenation occurs, there isn't a good way to access the embedded data with the concatenated name. Any ideas? Note: I found this answer which sets embedded data fields with the target index as a second L/M field. E.g. LM Field 1 = 2 LM Field 2 = ${e://Field/myfield_2} That's close to what I want, but because my starting index is variable and is set by a query string, I need to do something more like with start_ix = 1: LM Field 1 = $e{e://Field/start_ix + 1} LM Field 2 = $e{e://Field/myfield + $e{e://Field/start_ix + 1}} But that doesn't work - nor do I expect it to, as I don't think embedded data "math" supports string concatenation in the same way the `+` operator can concat strings in Javascript.

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