92 lines
3 KiB
TypeScript
92 lines
3 KiB
TypeScript
/**
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* Wraps the query parameters into UIEventSources
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*/
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import {UIEventSource} from "../UIEventSource";
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import Hash from "./Hash";
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export class QueryParameters {
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private static order: string [] = ["layout", "test", "z", "lat", "lon"];
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private static knownSources = {};
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private static initialized = false;
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private static defaults = {}
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private static documentation = {}
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private static addOrder(key) {
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if (this.order.indexOf(key) < 0) {
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this.order.push(key)
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}
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}
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private static init() {
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if (this.initialized) {
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return;
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}
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this.initialized = true;
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if (window?.location?.search) {
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const params = window.location.search.substr(1).split("&");
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for (const param of params) {
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const kv = param.split("=");
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const key = decodeURIComponent(kv[0]);
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QueryParameters.addOrder(key)
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const v = decodeURIComponent(kv[1]);
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const source = new UIEventSource<string>(v);
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source.addCallback(() => QueryParameters.Serialize())
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QueryParameters.knownSources[key] = source;
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}
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}
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}
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private static Serialize() {
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const parts = []
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for (const key of QueryParameters.order) {
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if (QueryParameters.knownSources[key]?.data === undefined) {
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continue;
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}
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if (QueryParameters.knownSources[key].data === "undefined") {
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continue;
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}
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if (QueryParameters.knownSources[key].data === QueryParameters.defaults[key]) {
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continue;
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}
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parts.push(encodeURIComponent(key) + "=" + encodeURIComponent(QueryParameters.knownSources[key].data))
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}
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// Don't pollute the history every time a parameter changes
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history.replaceState(null, "", "?" + parts.join("&") + Hash.Current());
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}
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public static GetQueryParameter(key: string, deflt: string, documentation?: string): UIEventSource<string> {
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if(!this.initialized){
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this.init();
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}
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QueryParameters.documentation[key] = documentation;
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if (deflt !== undefined) {
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QueryParameters.defaults[key] = deflt;
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}
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if (QueryParameters.knownSources[key] !== undefined) {
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return QueryParameters.knownSources[key];
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}
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QueryParameters.addOrder(key);
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const source = new UIEventSource<string>(deflt);
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QueryParameters.knownSources[key] = source;
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source.addCallback(() => QueryParameters.Serialize())
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return source;
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}
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public static GenerateQueryParameterDocs(): string {
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const docs = [];
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for (const key in QueryParameters.documentation) {
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docs.push("**" + key + "**: " + QueryParameters.documentation[key] + " (default value: _" + QueryParameters.defaults[key] + "_)")
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}
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return docs.join("\n\n");
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}
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} |