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pas2js: safecall for procedure

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git-svn-id: trunk@45417 -
This commit is contained in:
Mattias Gaertner 2020-05-18 11:00:06 +00:00
parent fef402f6e6
commit f74eb4692f
1 changed files with 19 additions and 3 deletions
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22
utils/pas2js/docs/translation.html
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@ -2178,8 +2178,15 @@ function(){
rtl = { rtl = {
... ...
createCallback: function(scope, fn){ createCallback: function(scope, fn){
var cb = function(){ var cb;
return scope[fn].apply(scope,arguments); if (typeof(fn)==='string'){
cb = function(){
return scope[fn].apply(scope,arguments);
};
} else {
cb = function(){
return fn.apply(scope,arguments);
};
}; };
cb.scope = scope; cb.scope = scope;
cb.fn = fn; cb.fn = fn;
@ -2195,9 +2202,18 @@ rtl = {
<ul> <ul>
<li>You can assign a nested procedure to procedure variable. <li>You can assign a nested procedure to procedure variable.
You don't need and you must not add the FPC "<i>is nested</i>" modifier.</li> You don't need and you must not add the FPC "<i>is nested</i>" modifier.</li>
<li>A procedural typed declared as 'reference to' accepts in pas2js procedures, <li>In pas2js a procedural typed declared as <i>'reference to'</i> accepts procedures,
local procedures and methods. Delphi only supports capturing procedures and methods. local procedures and methods. Delphi only supports capturing procedures and methods.
FPC 3.0.4 does not support reference-to.</li> FPC 3.0.4 does not support reference-to.</li>
<li>In pas2js the calling convention <i>safecall</i> has a special meaning:<br>
Assigning a procedure/method, uses <i>rtl.createSafeCallback</i> instead of
<i>createCallback</i>, enclosing a call in a <i>try..catch</i> block. When
an exception is thrown by JS, it is caught and delegated to
<i>rtl.handleUncaughtException(err)</i>.<br>
For example:<br>
<i>aButtonElement.OnClick:=@DoClick;</i> uses <i>rtl.createSafeCallback</i><br>
<i>aButtonElement.OnClick:=SomeElement.OnClick;</i> does not.<br>
</li>
</ul> </ul>
</div> </div>