Javascript within AppleScript 'missing value' (for clicking button in Safari)

Question

I have the following AppleScript with Javascript contained:

set buttontext to "Add Option"
set buttonloc to 1

tell application "Safari"
    activate
    tell window 1
        do JavaScript "var buttonTags = document.getElementsByTagName(\"button\"); 
        var searchText = \"" & buttontext & "\"; 
        var found; 
        for (var i = 0; i < buttonTags.length; i++) 
        {if (buttonTags[i].textContent == searchText) {
        found = buttonTags[i]; break;
        }
        }
        buttonTags[" & buttonloc & "].click();"
    end tell
end tell

It compiles fine but upon execution there is no action and I receive a 'missing value' error. It is designed to traverse a web page in Safari and allow a user to specify the button text and rank to be able to click it.

When execute this Javascript directly in Safari's dev console it works, but I need to have it in AppleScript to wrap it into a longer routine.

Advice appreciated!

Will Holdoway · Accepted Answer · 2018-01-03 10:01:56Z

1

I have managed to solve this with amending the end of the JS to:

buttonTags[" & buttonloc & "].click();" in current tab

answered Jan 3, 2018 at 10:01

Will Holdoway

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1 Comment

CJK Over a year ago

Yes, well done for figuring it out. Safari needs to know where to direct its JavaScript commands. You had it originally directing it at Window 1. Rather than a tell window 1 block, you could have had a tell document 1 block, and then omitted the ...in current tab. Or, simply, tell app "Safari" to do JavaScript "..." in front document.

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