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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - UIScriptController: script with no async tasks fails if an earlier script registered a callback"
href="https://bugs.webkit.org/show_bug.cgi?id=164762">164762</a>
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<th>Summary</th>
<td>UIScriptController: script with no async tasks fails if an earlier script registered a callback
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Tools / Tests
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>simon.fraser@apple.com
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<th>CC</th>
<td>lforschler@apple.com
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<p>
<div>
<pre>If one UI script registers a callback:
function getScrollDownUIScript(scrollX, scrollY)
{
return `(function() {
uiController.didEndScrollingCallback = function() {
uiController.uiScriptComplete();
};
uiController.scrollToOffset(${scrollX}, ${scrollY}, function() {});
})();`;
}
then a later one just wants to return data:
function getResultsUIScript()
{
return `(function() {
var results = {
zoomScale : uiController.zoomScale,
visibleRect : uiController.contentVisibleRect,
scrollingTree : uiController.scrollingTreeAsText
};
return JSON.stringify(results);
})();`;
}
that later one never returns because UIScriptContext::runUIScript() thinks there's an outstanding task.</pre>
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