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fix(index): dynamic css loading support for older browsers #134

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fix(index): dynamic css loading support for older browsers #134

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79bde8c
feat: add css async load support to old webkit browser
gaterking May 8, 2018
7b2b070
fix: change old browser regex defined
gaterking May 8, 2018
bd891a0
refactor: use setInterval to check style is loaded in old webkit browser
gaterking May 12, 2018
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4 changes: 4 additions & 0 deletions src/index.js
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Expand Up @@ -338,8 +338,10 @@ class MiniCssExtractPlugin {
]),
'}',
'var linkTag = document.createElement("link");',
'var isOldWebKit = Number(navigator.userAgent.replace(/.*AppleWebKit\\/(\\d+)..*/, "$1")) < 536;',
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Maybe we can find better solution for check this, can you investigate how this do example jquery or other frontend libraries?

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At present, old browser is less. I only use regex to match AppleWebKit 536, bescause I think it will cover most of old browser. There is another solution to check version:
https://github.com/filamentgroup/loadCSS/blob/master/src/onloadCSS.js
As bellow is another solution to check if css is loaded:
http://www.backalleycoder.com/2011/03/20/link-tag-css-stylesheet-load-event/
https://www.zachleat.com/web/load-css-dynamically/
Another question: Why we need to wait resolve for css chunks is loaded? CSS chunkses are appended in sequence, they can't impact each other. The waiting will increase js render time inversely. There is so less case we need to caculate element style when the the self css is loaded but next css is not loaded.

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@gaterking http://www.backalleycoder.com/2011/03/20/link-tag-css-stylesheet-load-event/ looks universal, but create new dom node looks overload.

Give me time on thinking about best solution, ping be tomorrow and we find better.

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https://github.com/guybedford/require-css/blob/master/css.js
A CSS Loader plugin for RequireJS which can be refered to.

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@gaterking looks solid, maybe we can port solution here?

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Yes, it's solid. We can remove some inspections such as ie or low version firefox. Webpack 4 don't support ie6 to 8.

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@gaterking we can avoid part of code for old ie

'linkTag.rel = "stylesheet";',
'linkTag.type = "text/css";',
'if (!isOldWebKit) {',
'linkTag.onload = resolve;',
'linkTag.onerror = function(event) {',
Template.indent([
Expand All @@ -349,9 +351,11 @@ class MiniCssExtractPlugin {
'reject(err);',
]),
'};',
'}',
'linkTag.href = fullhref;',
'var head = document.getElementsByTagName("head")[0];',
'head.appendChild(linkTag);',
'if (isOldWebKit) { resolve();}',
]),
'}).then(function() {',
Template.indent(['installedCssChunks[chunkId] = 0;']),
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