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@@ -0,0 +1,39 @@
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+const dynamicLoadScript = (src, callback) => {
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+ const existingScript = document.getElementById(src)
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+ const cb = callback || function() {}
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+
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+ if (!existingScript) {
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+ const script = document.createElement('script')
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+ script.src = src // src url for the third-party library being loaded.
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+ script.id = src
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+ document.body.appendChild(script)
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+
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+ const onEnd = 'onload' in script ? stdOnEnd : ieOnEnd
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+ onEnd(script, cb)
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+ }
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+
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+ if (existingScript && cb) cb(null, existingScript)
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+
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+ function stdOnEnd(script, cb) {
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+ script.onload = function() {
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+ // this.onload = null here is necessary
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+ // because even IE9 works not like others
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+ this.onerror = this.onload = null
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+ cb(null, script)
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+ }
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+ script.onerror = function() {
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+ this.onerror = this.onload = null
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+ cb(new Error('Failed to load ' + src), script)
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+ }
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+ }
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+
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+ function ieOnEnd(script, cb) {
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+ script.onreadystatechange = function() {
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+ if (this.readyState !== 'complete' && this.readyState !== 'loaded') return
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+ this.onreadystatechange = null
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+ cb(null, script) // there is no way to catch loading errors in IE8
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+ }
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+ }
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+}
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+
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+export default dynamicLoadScript
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