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SnapJS is used in Spectrum Display for drawing arc for Looplinks. Delay loading SnapJS until Spectrum Display is opened to greatly reduce the number of page loads that SnapJS is loaded on.
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...l_web_app/front_end/src/js/page_js/data_pages/data_pages_common/snapSVG_Library_Loader.js
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| /** | ||
| * snapSVG_Library_Loader.js | ||
| * | ||
| * Javascript for Loading the Snap SVG API Library (JS file included in this webapp) | ||
| * | ||
| * Uses jQuery $.ajax to load Javascript | ||
| * | ||
| */ | ||
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| //JavaScript directive: all variables have to be declared with "var", maybe other things | ||
| "use strict"; | ||
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| /////////////////////////////////////////// | ||
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| /** | ||
| * module imports | ||
| */ | ||
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| import { reportWebErrorToServer } from 'page_js/header_section_js_all_pages_main_pages/header_section_every_page/reportWebErrorToServer.js'; | ||
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| /** | ||
| * Local Constants | ||
| */ | ||
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| const LOADER_URL ="js/libs/snap.svg-min.js"; | ||
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| const LOADER_LOADED_NO = "LOADED_NO"; | ||
| const LOADER_LOADING_IN_PROGRESS = "LOADING_IN_PROGRESS"; | ||
| const LOADER_LOADED_YES = "LOADED_YES"; | ||
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| /** | ||
| * Local Variables | ||
| */ | ||
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| /** | ||
| * Local Variables - Chart Loader Loading | ||
| */ | ||
| let libraryLoader_Loaded = LOADER_LOADED_NO; | ||
| let libraryLoader_DeferredToResolveOnLoad = []; | ||
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| /** | ||
| * Local Variables - Core Charts Loading | ||
| */ | ||
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| let library_Loaded = LOADER_LOADED_NO; | ||
| let library_DeferredToResolveOnLoad = []; | ||
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| /** | ||
| * Local Class - Kind of a Hack but it works | ||
| */ | ||
| class Deferred_Local_LibraryLoader { | ||
| constructor() { | ||
| this.promise = new Promise((resolve, reject)=> { | ||
| try { | ||
| this.reject = reject; | ||
| this.resolve = resolve; | ||
| } catch( e ) { | ||
| reportWebErrorToServer.reportErrorObjectToServer( { errorException : e } ); | ||
| throw e; | ||
| } | ||
| }); | ||
| } | ||
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| containedPromise() { | ||
| return this.promise; | ||
| } | ||
| resolvePromise() { | ||
| this.resolve(); | ||
| } | ||
| rejectPromise() { | ||
| this.reject(); | ||
| } | ||
| }; | ||
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| /** | ||
| * Local Functions | ||
| */ | ||
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| /** | ||
| * | ||
| */ | ||
| let _loadSnapSVGLoader = function() { | ||
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| if ( libraryLoader_Loaded === LOADER_LOADED_YES ) { | ||
| return Promise.resolve(); | ||
| } | ||
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| if ( libraryLoader_Loaded === LOADER_LOADING_IN_PROGRESS ) { | ||
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| let deferred = new Deferred_Local_LibraryLoader(); | ||
| libraryLoader_DeferredToResolveOnLoad.push( deferred ); | ||
| // console.log("Adding to snapSVG_LibraryLoader_DeferredToResolveOnLoad"); | ||
| return { loadingPromise: deferred.containedPromise() }; | ||
| } | ||
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| libraryLoader_Loaded = LOADER_LOADING_IN_PROGRESS; | ||
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| return new Promise( function( resolve, reject ) { | ||
| try { | ||
| jQuery.ajax({ | ||
| url: LOADER_URL, | ||
| dataType: "script", | ||
| cache: true | ||
| }).done( function( data, textStatus, jqXHR ) { | ||
| try { | ||
| libraryLoader_Loaded = LOADER_LOADED_YES; | ||
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| let snapSVG_LibraryLoader_DeferredToResolveOnLoad_Local = libraryLoader_DeferredToResolveOnLoad; | ||
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| libraryLoader_DeferredToResolveOnLoad = []; // reset | ||
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| if ( snapSVG_LibraryLoader_DeferredToResolveOnLoad_Local.length > 0 ) { | ||
| for ( const snapSVG_LibraryLoader_DeferredToResolveOnLoadItem of snapSVG_LibraryLoader_DeferredToResolveOnLoad_Local ) { | ||
| // console.log("Processsing entry in snapSVG_LibraryLoader_DeferredToResolveOnLoad_Local, index: " + i ); | ||
| snapSVG_LibraryLoader_DeferredToResolveOnLoadItem.resolvePromise(); | ||
| } | ||
| } | ||
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| resolve(); | ||
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| } catch( e ) { | ||
| reportWebErrorToServer.reportErrorObjectToServer( { errorException : e } ); | ||
| throw e; | ||
| } | ||
| }).fail( function( jqXHR, textStatus, errorThrown ) { | ||
| handleRawAJAXError( jqXHR, textStatus, errorThrown ); | ||
| }); | ||
| } catch( e ) { | ||
| reportWebErrorToServer.reportErrorObjectToServer( { errorException : e } ); | ||
| throw e; | ||
| } | ||
| } ); | ||
| }; | ||
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| /** | ||
| * Public functions | ||
| */ | ||
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| /** | ||
| * | ||
| */ | ||
| let loadSnapSVG_Library = function() { | ||
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| if ( library_Loaded === LOADER_LOADED_YES ) { | ||
| return { isLoaded: true }; | ||
| } | ||
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| if ( library_Loaded === LOADER_LOADING_IN_PROGRESS ) { | ||
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| let deferred = new Deferred_Local_LibraryLoader(); | ||
| library_DeferredToResolveOnLoad.push( deferred ); | ||
| // console.log("Adding to snapSVG_LibraryCoreCharts_DeferredToResolveOnLoad"); | ||
| return { loadingPromise: deferred.containedPromise() }; | ||
| } | ||
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| library_Loaded = LOADER_LOADING_IN_PROGRESS; | ||
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| return { loadingPromise : new Promise( function( resolve, reject ) { | ||
| try { | ||
| let loadSnapSVG_Loader_Promise = _loadSnapSVGLoader() | ||
| loadSnapSVG_Loader_Promise.then(function(value) { // On Fulfilled | ||
| try { | ||
| library_Loaded = LOADER_LOADED_YES; | ||
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| let snapSVG_LibraryCoreCharts_DeferredToResolveOnLoad_Local = library_DeferredToResolveOnLoad; | ||
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| library_DeferredToResolveOnLoad = []; // reset | ||
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| if ( snapSVG_LibraryCoreCharts_DeferredToResolveOnLoad_Local.length > 0 ) { | ||
| snapSVG_LibraryCoreCharts_DeferredToResolveOnLoad_Local.forEach(function( snapSVG_LibraryCoreCharts_DeferredToResolveOnLoadItem, i, array) { | ||
| // console.log("Processsing entry in snapSVG_LibraryCoreCharts_DeferredToResolveOnLoad_Local, index: " + i ); | ||
| snapSVG_LibraryCoreCharts_DeferredToResolveOnLoadItem.resolvePromise(); | ||
| }, this) | ||
| } | ||
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| resolve(); | ||
| } catch( e ) { | ||
| reportWebErrorToServer.reportErrorObjectToServer( { errorException : e } ); | ||
| throw e; | ||
| } | ||
| }).catch(function(reason) { | ||
| try { | ||
| throw Error( "ERROR: Loading Snap SVG JS Library from Local webapp" ); | ||
| } catch( e ) { | ||
| reportWebErrorToServer.reportErrorObjectToServer( { errorException : e } ); | ||
| throw e; | ||
| } | ||
| }); | ||
| } catch( e ) { | ||
| reportWebErrorToServer.reportErrorObjectToServer( { errorException : e } ); | ||
| throw e; | ||
| } | ||
| } ) }; | ||
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| }; | ||
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| export { loadSnapSVG_Library } |
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