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simple jsonp that supports browser caching
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| const fetchJSONP = ((callback, callbackName) => { | |
| const map = new WeakMap(); | |
| window[callbackName] = json => { | |
| const script = document.currentScript; | |
| const fn = map.get(script); | |
| if (fn) { | |
| map.delete(script); | |
| fn(json); | |
| script.remove(); | |
| } | |
| }; | |
| return url => new Promise(resolve => { | |
| const script = document.createElement('script'); | |
| url += url.indexOf('?') !== -1 ? '&' : '?'; | |
| url += callback + '=' + callbackName; | |
| map.set(script, resolve); | |
| script.src = url; | |
| document.body.append(script); | |
| }); | |
| })('callback', '_jsonp_global_'); |
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| fetch = ((nativeFetch) => { | |
| return (url, options) => { | |
| if (options && options.method.toUpperCase() === 'JSONP') { | |
| return fetchJSONP(url) | |
| .then(json => new Response(JSON.stringify(json))); | |
| } | |
| return nativeFetch(url, options); | |
| }; | |
| })(fetch); |
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| // test on jsfiddle | |
| // https://jsfiddle.net/zakariamouhid/pyzagmx7/2/ | |
| // it depends on document.currentscript | |
| // https://caniuse.com/document-currentscript | |
| // Examples | |
| const url = 'https://zakariamouhid.blogspot.com/feeds/posts/default?alt=json-in-script&max-results=0'; | |
| fetchJSONP(url).then(json => { | |
| console.log(json.version); | |
| }); | |
| fetch(url, { method: 'JSONP' }) | |
| .then(res => res.json()) | |
| .then(json => { | |
| console.log(json.version); | |
| }); |
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