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Update key explorer to use dialog element for help dialog. (mathjax/MathJax#3405) #1334

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Update key explorer to use dialog element for help dialog. (mathjax/MathJax#3405) #1334

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5ecd167
Update key explorer to use dialog element for help dialog. (mathjax/M…
dpvc Aug 8, 2025
b92c329
Reformat for prettier, and fix string param to setAttribute
dpvc Aug 8, 2025
1a769e7
Fix number for prettier
dpvc Sep 3, 2025
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20 changes: 14 additions & 6 deletions ts/a11y/explorer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -420,21 +420,30 @@ export function ExplorerMathDocumentMixin<

'mjx-help-sizer': {
position: 'fixed',
width: '40%',
width: '45%',
'max-width': '30em',
top: '3em',
left: '50%',
},
'mjx-help-dialog': {
'mjx-help-sizer > .mjx-help-dialog': {
position: 'absolute',
width: '200%',
left: '-100%',
'max-width': 'initial',
},
'.mjx-help-dialog': {
'max-width': 'calc(min(60em, 90%))',
border: '3px outset',
'border-radius': '15px',
color: 'black',
'background-color': '#DDDDDD',
'z-index': '301',
'box-shadow': '0px 10px 20px #808080',
'text-align': 'right',
},
'.mjx-help-dialog::backdrop': {
opacity: 0.75,
},
'mjx-help-dialog': {
'font-style': 'normal',
'text-indent': 0,
'text-transform': 'none',
Expand All @@ -443,8 +452,6 @@ export function ExplorerMathDocumentMixin<
'word-spacing': 'normal',
'word-wrap': 'normal',
float: 'none',
'box-shadow': '0px 10px 20px #808080',
outline: 'none',
},
'mjx-help-dialog > h1': {
'font-size': '24px',
Expand All @@ -453,7 +460,7 @@ export function ExplorerMathDocumentMixin<
},
'mjx-help-dialog > div': {
margin: '0 1em',
padding: '3px',
padding: '3px 10px',
overflow: 'auto',
height: '20em',
border: '2px inset black',
Expand Down Expand Up @@ -488,6 +495,7 @@ export function ExplorerMathDocumentMixin<
left: 0,
right: 0,
bottom: 0,
'z-index': 1001,
},
};

Expand Down
67 changes: 43 additions & 24 deletions ts/a11y/explorer/KeyExplorer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -933,40 +933,59 @@ export class SpeechExplorer
* Displays the help dialog.
*/
protected help() {
const isDialog = !!window.HTMLDialogElement;
const adaptor = this.document.adaptor;
const helpBackground = adaptor.node('mjx-help-background');
const helpBackground = isDialog
? null
: adaptor.node('mjx-help-background');
const close = (event: Event) => {
helpBackground.remove();
if (isDialog) {
helpDialog.close();
helpDialog.remove();
} else {
helpBackground.remove();
}
this.node.focus();
this.stopEvent(event);
};
helpBackground.addEventListener('click', close);
const helpSizer = adaptor.node('mjx-help-sizer', {}, [
adaptor.node(
'mjx-help-dialog',
{ tabindex: 0, role: 'dialog', 'aria-labeledby': 'mjx-help-label' },
[
adaptor.node('h1', { id: 'mjx-help-label' }, [
adaptor.text('MathJax Expression Explorer Help'),
]),
adaptor.node('div'),
adaptor.node('input', { type: 'button', value: 'Close' }),
]
),
]);
helpBackground.append(helpSizer);
const help = helpSizer.firstChild as HTMLElement;
help.addEventListener('click', (event) => this.stopEvent(event));
const helpDialog = adaptor.node(
'dialog',
{ closedby: 'any', class: 'mjx-help-dialog' },
[
adaptor.node(
'mjx-help-dialog',
{ role: 'dialog', 'aria-labeledby': 'mjx-help-label' },
[
adaptor.node('h1', { id: 'mjx-help-label' }, [
adaptor.text('MathJax Expression Explorer Help'),
]),
adaptor.node('div'),
adaptor.node('input', { type: 'button', value: 'Close' }),
]
),
]
) as HTMLDialogElement;
const help = helpDialog.firstChild as HTMLElement;
const [title, select] = helpData.get(context.os);
(help.childNodes[1] as HTMLElement).innerHTML = helpMessage(title, select);
help.lastChild.addEventListener('click', close);
help.addEventListener('keydown', (event: KeyboardEvent) => {
helpDialog.addEventListener('keydown', (event: KeyboardEvent) => {
if (event.code === 'Escape') {
close(event);
}
});
const [title, select] = helpData.get(context.os);
(help.childNodes[1] as HTMLElement).innerHTML = helpMessage(title, select);
document.body.append(helpBackground);
help.focus();
if (isDialog) {
document.body.append(helpDialog);
helpDialog.showModal();
} else {
helpDialog.setAttribute('tabindex', '0');
help.addEventListener('click', (event) => this.stopEvent(event));
helpBackground.addEventListener('click', close);
const helpSizer = adaptor.node('mjx-help-sizer', {}, [helpDialog]);
helpBackground.append(helpSizer);
document.body.append(helpBackground);
}
helpDialog.focus();
}

/********************************************************************/
Expand Down