HTML5 limitations?

Kevin Miller kevin at runrev.com
Tue Jul 25 15:54:06 EDT 2017


Go in window of stack works

You can download stacks just fine

Sent from my iPhone

> On 25 Jul 2017, at 12:46, Jonathan Lynch via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> In HTML the browser is the engine that runs both HTML and JavaScript. It is possible to have multiple tabs and there are some functions for communicating between tabs and windows, but it isn't pretty. You have to use localstorage and storage events.
> 
> This could be made to work similar to an LC engine running multiple stacks, but it is like turning real fish into artificial crab. It is a lot of work to make something that will probably leave you with a bad taste in your mouth.
> 
> Sent from my iPhone
> 
>> On Jul 25, 2017, at 3:30 PM, J. Landman Gay via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> Thanks. I don't think the sandbox is an issue, the app doesn't read or write to the user's drive at all. The various animations, and splash-stack approach might be a concern, as well as the number of stacks that are in RAM at any one time. Common images and icons are also stored in the standalone, which are displayed in the downloaded stacks as they are opened.
>> 
>> The only HTML5 examples I've seen are all self-contained single stack standalones.
>> 
>>> On 7/25/17 2:00 PM, Jonathan Lynch via use-livecode wrote:
>>> Well, the sandbox is a huge issue. JavaScript is not allowed to access many things that LC can access in the user's system.
>>> The sandbox protects against malicious pages.
>>> It is very hard to simulate the mouseStillDown handler in HTML/JS.
>>> My app is a hybrid of LC and html5. The pace of development for LC is easily 10 times faster for me.
>>> LC text processing and array management is much much more flexible.
>>> "Get the keys of myArray" beats enumerating through a JS array any day.
>>> JS does not have true associative arrays, although you can work around that with datamaps.
>>> JS does not have programmatic access to the clipboard.
>>> Most of the limitations are related to security issues. If the sandbox is not an issue, then html5 will probably work, but they should expect to spend a fortune and live with a long development cycle with painfully slow bug fixes.
>>> Sent from my iPhone
>>>> On Jul 25, 2017, at 2:42 PM, J. Landman Gay via use-livecode <use-livecode at lists.runrev.com> wrote:
>>>> 
>>>> I have a client that wants to move our project to HTML5. I have some doubts about the capabilities, could someone tell me what is currently possible and what is not?
>>>> 
>>>> This is a very large set of stacks, run by a standalone that loads content on demand from a server. It is image-heavy and interacts with a networked database. There is lots of navigation between stacks and many hundreds of cards. At any given time, there can be up to a dozen stacks held in RAM. There is also heavy use of visual effects and animation.
>>>> 
>>>> Thoughts?
>>>> 
>>>> -- 
>>>> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
>>>> HyperActive Software           |     http://www.hyperactivesw.com
>>>> 
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>> 
>> 
>> -- 
>> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
>> HyperActive Software           |     http://www.hyperactivesw.com
>> 
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