ae3e19f12c
Make getMessageArray return an empty array (rather than null) when there are no mmessages, and change console.js to expect this (but check against null anyway.)
110 lines
3.2 KiB
JavaScript
110 lines
3.2 KiB
JavaScript
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/*
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* Functions for initializing and updating the JavaScript Console.
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*/
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/*
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* Listener to be registered with the console service, called on new errors.
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*/
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var consoleListener = {
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observe : function(messageObject) {
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appendMessage(messageObject);
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}
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}
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/*
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* Gets the current context of the console service and dumps it to the window,
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* and registers a listener with the service to be called on additional errors.
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*/
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function onLoadJSConsole()
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{
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try {
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var cs_class = Components.classes['consoleservice'];
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var cs_iface = Components.interfaces.nsIConsoleService;
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var cs_isupports = cs_class.getService();
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var cs = cs_isupports.QueryInterface(cs_iface);
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} catch(exn) {
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// Couldn't get the console service for some reason...
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// pretend it never happened.
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// XXX instead should write some message to the console re:
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// unable to get console service.
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return;
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}
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var o1 = {}; // Throwaway references to support 'out' parameters.
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var o2 = {};
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var messages;
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cs.getMessageArray(o1, o2);
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messages = o1.value;
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// In case getMessageArray returns 0-length array as null.
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if (messages == null)
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messages = [];
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for (i = 0; i < messages.length; i++) {
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appendMessage(messages[i]);
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}
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cs.registerListener(consoleListener);
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}
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function onUnloadJSConsole()
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{
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// keep a global ref. to it instead???
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try {
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var cs_class = Components.classes['consoleservice'];
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var cs_iface = Components.interfaces.nsIConsoleService;
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var cs_isupports = cs_class.getService();
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var cs = cs_isupports.QueryInterface(cs_iface);
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} catch(exn) {
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// Couldn't get the console service for some reason...
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// pretend it never happened.
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return;
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}
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cs.unregisterListener(consoleListener);
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}
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/*
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* Given a message, write it to the page.
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*
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* TODO: (When interesting subclasses of message objects become available) -
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* reflect structure of messages (e.g. lineno, etc.) as CSS-decorable structure.
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*/
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function appendMessage(messageObject)
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{
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var c = document.getElementById("console");
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var e = document.createElement("message");
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var t = document.createTextNode(messageObject.message);
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e.appendChild(t);
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c.appendChild(e);
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}
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// XXX q: if window is open, does it grow forever? Is that OK?
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// or should it do its own retiring?
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