Dyalog Forums

Posted: **Sun Oct 27, 2019 7:56 pm**

Hi there,
I'd be very grateful for some help as i'm stuck again!

I am using MiServer. I have an APL boolean in my Compose function. I need to refer to it from within a scripted section for a conditional action. I've tried along the lines below:

dark← 6 ∊ darklist
Add _.script ScriptFollows
⍝var darknew = document.getElementById ('dark');
⍝ if (darknew) {
⍝....
⍝....
⍝ }

Both of the variables (dark and darknew) appear to be recognised as existing in the scripted section. However it always seems to contain a zero value. The code works fine if I assign the variable value within the scripted section (⍝var darknew = 1)

Many thanks, Jinny

Posted: **Mon Oct 28, 2019 9:57 am**

So the web page (and therefore the Javascript) doesn't automatically pick up APL variables from the workspace, they need to be retrieved from the server. In the case of

Code: Select all

⍝var darknew = 1

, you are assigning a JS variable "darknew" the value 1. However, using

Code: Select all

dark←6∊darklist

doesn't create an html element with ID "dark".

One way to get the value of APL's "dark" into your web page is to construct a javascript statement as an APL text vector. I misread at first and thought you wanted darklist in there. If you want to pass a list to Javascript, use ⎕JSON to format the list properly.

In the code below, the title displays "My App" unless you remove the line "dark←0", in which case the title displays "darknew works".

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  ∇ Compose
  :Access Public
  'title'Add _.h1 'My App'
  darklist←6 6 4 10 5 3 1 10 1 6
  dark←6∊darklist
  dark←0
  script←'var darknew = ', dark,';'
  script,←'console.log("test");'
  Add _.script script
  Add _.script ScriptFollows
  ⍝if (darknew) {
  ⍝console.log("darknew");
  ⍝document.getElementById("title").innerHTML = "darknew works";
  ⍝}
  ∇

Posted: **Thu Oct 31, 2019 8:02 am**

Many thanks. I haven't managed to get it to work yet - but still experimenting with fresh optimism!

Posted: **Thu Nov 21, 2019 7:01 pm**

Hooray, it's working.

However, I thought that it might be useful for other readers to know why it didn't work immediately. For some reason, cutting and pasting the lines failed but when I typed them on from scratch they were fine.

Thank you again!

Dyalog Forums

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