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clone global stylesheet elements into root for shadowdom support #223

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merged 2 commits into from
Nov 28, 2018
Merged

clone global stylesheet elements into root for shadowdom support #223

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892aba1
clone stylesheets into root
Nov 28, 2018
84116c5
move style localization to function and two loops and only once
Nov 28, 2018
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56 changes: 31 additions & 25 deletions google-chart.html
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Original file line number Diff line number Diff line change
Expand Up @@ -312,31 +312,10 @@
this.$.loader.create(this.type, this.$.chartdiv)
.then(function(chart) {

// get all gchart stylesheets
var stylesheets =
Polymer.dom(document.head)
.querySelectorAll('link[rel="stylesheet"][type="text/css"]');
var gchartStylesheets = Array.from(stylesheets).filter(
function(element) {
return element.id.indexOf('load-css-') == 0;
});

// clone necessary attributes
var clonedSheets = gchartStylesheets.map(
function(stylesheet) {
var link = document.createElement('link');
link.setAttribute('rel', 'stylesheet');
link.setAttribute('type', 'text/css');
link.setAttribute('href', stylesheet.getAttribute('href'));
return link;
}
);

// append them to this local dom (for sdom support)
clonedSheets.forEach(
function(stylesheet) {
Polymer.dom(this.$.styles).appendChild(stylesheet);
}.bind(this));
// only add link stylesheet elements if there are none already
if (!this.$.styles.children.length) {
this._localizeGlobalStylesheets();
}

var loader = this.$.loader;
Object.keys(this.events.concat(['select', 'ready'])
Expand Down Expand Up @@ -497,6 +476,33 @@
.then(function(dataView) {
this._dataView = dataView;
}.bind(this));
},

/**
* Queries global document head for google charts link#load-css-* and clones
* them into the local root's div#styles element for shadow dom support.
*/
_localizeGlobalStylesheets: function() {
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I think my version in #204 handles some edge cases a little better.
https://github.com/GoogleWebComponents/google-chart/pull/204/files#diff-d0b4f475ae2630d8efc01169d1a41af6R80

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I merged this on behalf of an internal request from a blocked user. I'd 100% be willing to review your import CL over this implementation.

// get all gchart stylesheets
var stylesheets = Polymer.dom(document.head)
.querySelectorAll('link[rel="stylesheet"][type="text/css"]');

var stylesheetsArray = Array.from(stylesheets);

for (var i = 0; i < stylesheetsArray.length; i++) {
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.forEach should be safe for both Array and NodeList

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Oh not for IE11 though maybe?

var sheetLinkEl = stylesheetsArray[i];
var isGchartStylesheet = sheetLinkEl.id.indexOf('load-css-') == 0;

if (isGchartStylesheet) {
// clone necessary stylesheet attributes
var clonedLinkEl = document.createElement('link');
clonedLinkEl.setAttribute('rel', 'stylesheet');
clonedLinkEl.setAttribute('type', 'text/css');
clonedLinkEl.setAttribute('href', sheetLinkEl.getAttribute('href'));

Polymer.dom(this.$.styles).appendChild(clonedLinkEl);
}
}
}
});
})();
Expand Down