93 lines
2.6 KiB
JavaScript
93 lines
2.6 KiB
JavaScript
function Invoker() {
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this.pending_count = 0;
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}
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// Invoke the given URL with a remote scripting call, providing the data args as an associative
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// array of key/value pairs. Optionally, the name of a form to scrape for args can also be provided.
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// http_type should be 'POST' or 'GET'.
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Invoker.prototype.invoke = function ( url, http_type, args, callback, form, synchronous, fire_and_forget ) {
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if ( form ) {
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var form = formContents( getElement( form ) );
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var arg_names = form[ 0 ];
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var arg_values = form[ 1 ];
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} else {
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var arg_names = [];
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var arg_values = [];
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}
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extend( arg_names, keys( args ) );
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extend( arg_values, values( args ) );
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if ( synchronous )
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fire_and_forget = true;
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if ( !fire_and_forget ) {
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if ( this.pending_count == 0 ) {
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if ( http_type == 'POST' )
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var status_text = "saving"
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else
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var status_text = "loading"
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var loading = createDOM( "span", { "class": "status_text" }, status_text );
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replaceChildNodes( "status_area", loading );
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}
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this.pending_count += 1;
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}
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if ( http_type == 'POST' ) {
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// HTTP POST
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request = getXMLHttpRequest();
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request.open( http_type, url, synchronous != true );
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request.setRequestHeader( 'Content-Type', 'application/x-www-form-urlencoded' );
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if ( arg_names.length > 0 )
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var doc = sendXMLHttpRequest( request, queryString( arg_names, arg_values ) );
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else
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var doc = sendXMLHttpRequest( request );
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} else {
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// HTTP GET
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if ( arg_names.length > 0 )
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var doc = doSimpleXMLHttpRequest( url, arg_names, arg_values );
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else
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var doc = doSimpleXMLHttpRequest( url );
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}
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if ( fire_and_forget )
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return;
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var self = this;
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doc.addCallbacks(
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function ( request ) {
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self.handle_response( request, callback );
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},
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function () {
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self.pending_count -= 1;
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replaceChildNodes( "status_area", createDOM( "span" ) );
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signal( self, "error_message", "There was a problem reaching the server. Please check your network connectivity." );
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}
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);
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}
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Invoker.prototype.handle_response = function ( request, callback ) {
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// if there are no more pending requests, clear the loading status
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this.pending_count -= 1;
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if ( this.pending_count == 0 )
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replaceChildNodes( "status_area", createDOM( "span" ) );
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var result = evalJSONRequest( request );
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if ( result.error ) {
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signal( this, "error_message", result.error );
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return;
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}
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if ( result.message )
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signal( this, "message", result.message );
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if ( callback )
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callback( result );
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else if ( result.redirect )
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window.location = result.redirect;
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else if ( result.reload )
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window.location.reload();
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}
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