4 * General purpose functions for manipulation of page content.
9 * Written by Keith Marshall <keith@users.osdn.me>
10 * Copyright (C) 2020, MinGW.org Project
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14 * copy of this software and associated documentation files (the "Software"),
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33 function set_content( item, value )
34 { /* Replace the existing content, if any, of the HTML element with
35 * id attribute named "item", (if such an element exists), with new
36 * content as specified by "value".
38 var element = document.getElementById( item );
39 if( element ) element.innerHTML = value;
42 function load_content( container, src )
43 { /* Set the content of the specified HTML "container" element, by
44 * injection of the entire contents of an external file which is
45 * fetched by http server request; (either an http, or an https,
46 * server connection is required; does not work for local files).
48 var request_handler = new XMLHttpRequest();
49 request_handler.onreadystatechange = function()
50 { if( this.readyState == this.DONE )
53 set_content( container, this.responseText );
56 load_content( container, "missing.html" );
59 request_handler.open( "GET", src, true );
60 request_handler.send();
63 function load_page_content( src, subtitle )
64 { /* Propagate the HTML document title to the "masthead" display,
65 * update the displayed page subtitle, (which may be null), and
66 * load the page content from the specified "src" file.
68 set_content( "page-content", null );
69 set_content( "page-title", document.title );
70 set_content( "page-subtitle", subtitle );
71 load_content( "page-content", src );
74 function load_page_overlay( src, title, subtitle )
75 { /* Replace the existing page content from the specified overlay
76 * "src" file, updating the page title, and subtitle, as may be
79 if( title ) document.title = title;
80 load_page_content( src, subtitle );
83 function new_page( src, subtitle )
84 { /* Create a new page display, starting from scratch; assign the
85 * displayed title from the HTML document title attribute, adding
86 * the specified subtitle, lay out the standard page header block,
87 * and load the page content from the "src" file.
89 load_content( "header", "header.html" );
90 load_page_content( src, subtitle );
93 /* $RCSfile$: end of file */