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Chainable URL Query Builder
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| function QueryBuilder(url) { | |
| return { | |
| state: { | |
| sort: {}, | |
| limit: -1, | |
| offset: -1, | |
| filters: {} | |
| }, | |
| sort(field, asc = true) { | |
| this.state.sort[field] = asc; | |
| return this; | |
| }, | |
| sortDesc(field) { | |
| return this.sort(field, false); | |
| }, | |
| limit(limit) { | |
| this.state.limit = limit; | |
| return this; | |
| }, | |
| offset(offset) { | |
| this.state.offset = offset; | |
| return this; | |
| }, | |
| filter(field, value) { | |
| this.state.filters[field] = value; | |
| return this; | |
| }, | |
| filterBefore(field, value) { | |
| field += ".before"; | |
| this.state.filters[field] = value; | |
| return this; | |
| }, | |
| filterAfter(field, value) { | |
| field += ".after"; | |
| this.state.filters[field] = value; | |
| return this; | |
| }, | |
| query() { | |
| let fragments = []; | |
| const filters = Object.keys(this.state.filters); | |
| for (let i = 0; i < filters.length; i++) { | |
| let fragment = encodeURIComponent(filters[i]) + "=" + encodeURIComponent(this.state.filters[filters[i]]); | |
| fragments.push(fragment) | |
| } | |
| const sorts = Object.keys(this.state.sort); | |
| const sort = []; | |
| for (let i = 0; i < sorts.length; i++) { | |
| let suffix; | |
| if (this.state.sort[sorts[i]]) { | |
| suffix = ".asc"; | |
| } else { | |
| suffix = ".desc"; | |
| } | |
| sort.push(encodeURIComponent(sorts[i] + suffix)); | |
| } | |
| if (sort.length) { | |
| fragments.push("sort=" + sort.join(",")); | |
| } | |
| if (this.state.offset > -1) { | |
| fragments.push("offset=" + this.state.offset); | |
| } | |
| if (this.state.limit > -1) { | |
| fragments.push("limit=" + this.state.limit); | |
| } | |
| let query = url; | |
| if (fragments.length) { | |
| query += "?" + fragments.join("&") | |
| } | |
| return query; | |
| }, | |
| execute() { | |
| return fetch(this.query()); | |
| } | |
| } | |
| } | |
| let query = QueryBuilder("http://127.0.0.1/programmes"); | |
| let v = query.offset(10).limit(5).filter("name", "John").filterBefore("start_at", "2019-12-03T11:00").sort("name").sortDesc("age").query(); | |
| console.log(v); |
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