janishutz-legacy/impress.js
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Broader try-catch for handling impress-console-button disappearance (#652)

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The previous attempt at merely reading a property of event.target was
incorrect. It worked at first but errors reappeared later, so must
have been a reace.

This wraps the entire navigation event handlers in the try-catch, and
then checks for the very specific error and suppresses it. Other errors
are rethrown as is.
This commit is contained in:
Henrik Ingo
2018-01-01 16:03:13 +02:00
parent 784a6d245b
commit 8b14eda98f
2 changed files with 86 additions and 68 deletions
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77
js/impress.js
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@@ -2965,33 +2965,35 @@
// check if event target (or any of its parents is a link)
var target = event.target;
try {
while ( ( target.tagName !== "A" ) &&
( target !== document.documentElement ) ) {
target = target.parentNode;
}
if ( target.tagName === "A" ) {
var href = target.getAttribute( "href" );
// If it's a link to presentation step, target this step
if ( href && href[ 0 ] === "#" ) {
target = document.getElementById( href.slice( 1 ) );
}
}
if ( api.goto( target ) ) {
event.stopImmediatePropagation();
event.preventDefault();
}
}
catch ( err ) {
// For example, when clicking on the button to launch speaker console, the button
// is immediately deleted from the DOM. In this case target is a DOM element when
// we get it, but turns out to be null if you try to actually do anything with it.
var foo = target.id; // jshint ignore:line
}
catch ( err ) {
return;
}
while ( ( target.tagName !== "A" ) &&
( target !== document.documentElement ) ) {
target = target.parentNode;
}
if ( target.tagName === "A" ) {
var href = target.getAttribute( "href" );
// If it's a link to presentation step, target this step
if ( href && href[ 0 ] === "#" ) {
target = document.getElementById( href.slice( 1 ) );
if ( err instanceof TypeError &&
err.message === "target is null" ) {
return;
}
}
if ( api.goto( target ) ) {
event.stopImmediatePropagation();
event.preventDefault();
throw err;
}
}, false );
@@ -2999,21 +3001,28 @@
gc.addEventListener( document, "click", function( event ) {
var target = event.target;
try {
var foo = target.id; // jshint ignore:line
// Find closest step element that is not active
while ( !( target.classList.contains( "step" ) &&
!target.classList.contains( "active" ) ) &&
( target !== document.documentElement ) ) {
target = target.parentNode;
}
if ( api.goto( target ) ) {
event.preventDefault();
}
}
catch ( err ) {
return;
}
// Find closest step element that is not active
while ( !( target.classList.contains( "step" ) &&
!target.classList.contains( "active" ) ) &&
( target !== document.documentElement ) ) {
target = target.parentNode;
}
if ( api.goto( target ) ) {
event.preventDefault();
// For example, when clicking on the button to launch speaker console, the button
// is immediately deleted from the DOM. In this case target is a DOM element when
// we get it, but turns out to be null if you try to actually do anything with it.
if ( err instanceof TypeError &&
err.message === "target is null" ) {
return;
}
throw err;
}
}, false );