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Fix adjustFormat dropping d3-format specs that start with a sign flag #7900

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Fix adjustFormat dropping d3-format specs that start with a sign flag #7900

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a6b2c2a
Fix adjustFormat dropping d3-format specs that start with a sign flag
TemRevil Jul 10, 2026
053662f
Add draftlog for #
TemRevil Jul 10, 2026
6ae433c
Remove malformed draftlog
TemRevil Jul 10, 2026
95dc3ad
Add draftlog for #7900
TemRevil Jul 10, 2026
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1 change: 1 addition & 0 deletions draftlogs/7900_fix.md
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@@ -0,0 +1 @@
- Fix `hovertemplate`/`texttemplate`/`tickformat`/`hoverformat` silently ignoring d3-format specs that start with a sign flag such as `+.2f` [[#7900](https://github.com/plotly/plotly.js/pull/7900)]
11 changes: 9 additions & 2 deletions src/lib/index.js
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Expand Up @@ -19,8 +19,15 @@ lib.adjustFormat = function adjustFormat(formatStr) {
if (/^\d%/.test(formatStr)) return '~%';
if (/^\ds/.test(formatStr)) return '~s';

// try adding tilde to the start of format in order to trim
if (!/^[~,.0$]/.test(formatStr) && /[&fps]/.test(formatStr)) return '~' + formatStr;
// A d3-format spec may begin with a sign flag (+, -, (, space) and/or a
// symbol ($, #). Look past that prefix before deciding whether to trim, and
// reattach it: prepending the tilde to the whole string (e.g. "~+.2f") is an
// invalid spec that d3Format rejects, so "+.2f" used to be silently dropped.
var prefix = (formatStr.match(/^[+\-( ]?[$#]?/) || [''])[0];
var rest = formatStr.slice(prefix.length);

// try adding tilde to trim trailing zeros
if (!/^[~,.0$]/.test(rest) && /[&fps]/.test(rest)) return prefix + '~' + rest;

return formatStr;
};
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6 changes: 6 additions & 0 deletions test/jasmine/tests/lib_number_format_test.js
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Expand Up @@ -53,6 +53,12 @@ describe('number format', function() {
{ format: '0f', number: float, exp: '12345.678901'},
{ format: '1f', number: float, exp: '12345.678901'},

// sign flag with an explicit precision must not be dropped (was silently
// ignored because adjustFormat produced the invalid spec "~+.2f")
{ format: '+.2f', number: float, exp: '+12345.68'},
{ format: '+.0f', number: float, exp: '+12346'},
{ format: '-.4f', number: float, exp: '12345.6789'},

// space-filled and default sign
{ format: '-13', number: float, exp: '-12345.678901'},
{ format: '-14', number: float, exp: ' -12345.678901'},
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