Another code sample. Drag the attached to TiddlyWiki.com . The "Random HTML" tiddler is a patchwork of code bits I scammed from the web. This Tiddler has the javascript needed to get a random value from a comma-separated-value list and present that value.
The "Getting Random Values" tiddler puts in a variable ("vReplacement") a
comma-separated-value list of tiddler titles, for all tiddlers having
"HTML" in the title. *(Yeah, I could have been a little bit more creative
and put together something much more practical.)*
The "source document" for the iFrame in "Getting Random Values" alters the
transcluded HTML (from "Random HTML" tiddler) by substituting a keyword in
the HTML ("CsvList") with the value of the "vReplacement" variable.
So this little sample code pattern demonstrates how an iFrame can show
dynamically created/modified HTML+javascript.
On Monday, August 16, 2021 at 11:55:46 AM UTC-3 Charlie Veniot wrote:
> Updated one of the tiddlers in the JSON package. New version attached.
>
> The addition highlighted below:
>
> <body>
> <div id="clockDiv"></div>
> <script>
> *document.oncontextmenu = function() { *
> * return false; *
> *};*
> let clockEl = document.getElementById("clockDiv");
> ...
>
> The reason for the added code: block access to the back button in the
> iFrame (by blocking access to the entire menu), which winds up performing
> the back button operation on the entire browser page.
> On Sunday, August 15, 2021 at 11:27:41 PM UTC-3 Charlie Veniot wrote:
>
>> I don't know what made me think of this.
>>
>> In case this has not been brought up in a while (I doubt this is new to
>> seasoned folk) ...
>>
>> I was thinking: could I use an iFrame to include simple javascript in a
>> tiddler without getting into macros or plugins that enable javascript.
>>
>> And, if I could, then could I set things up so that the iFrame is showing
>> javascript dynamically created by the tiddler ?
>>
>> So here is a way to show a digital clock in TiddlyWiki, for
>> non-programmers who just want to copy and paste javascript code from the
>> web without figuring out how the javascript code works :
>>
>> Put this in a brand new tiddler:
>>
>> *<$vars* *vSrcDoc*={{{ [[<body> <div id="clockDiv"></div> <script>
>> let clockEl = document.getElementById("clockDiv"); function
>> getClockTime() { let date = new Date(); let hr =
>> date.getHours(); let min = date.getMinutes(); let sec =
>> date.getSeconds(); hr = ("0" + hr).slice(-2); min = ("0" +
>> min).slice(-2); sec = ("0" + sec).slice(-2); clockEl.innerHTML =
>> `${hr}:${min}:${sec}`; } setInterval(getClockTime, 1000);
>> </script></body>]] }}}*>*
>> *<iframe* srcdoc=*<<vSrcDoc>>* style="border:none;width:100%;"
>> *></iframe>*
>> *</$vars>*
>>
>> Sneaky sneaky, has me wondering what kind of other fun things could be
>> done...
>>
>
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TwRandomFromCsvList.json
Description: application/json
