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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Redefine '$' here rather than including 'cr.js', since this is
// the only function needed. This allows this file to be loaded
// in a browser directly for layout and some testing purposes.
var $ = function(id) { return document.getElementById(id); };
/**
* WebUI for configuring instant.* preference values used by
* Chrome's instant search system.
*/
var instantConfig = (function() {
'use strict';
/** List of fields used to dynamically build form. **/
var FIELDS = [
{
key: 'instant.animation_scale_factor',
label: 'Slow down animations by a factor of',
type: 'float',
units: 'no units, range 1 to 10',
default: 1
},
{
key: 'instant.experimental_zero_suggest_url_prefix',
label: 'Prefix URL for the (experimental) ZeroSuggest provider',
type: 'string',
units: '',
default: ''
}
];
/**
* Returns a DOM element of the given type and class name.
*/
function createElementWithClass(elementType, className) {
var element = document.createElement(elementType);
element.className = className;
return element;
}
/**
* Dynamically builds web-form based on FIELDS list.
* @return {string} The form's HTML.
*/
function buildForm() {
var buf = [];
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
var row = createElementWithClass('div', 'row');
row.id = '';
var label = createElementWithClass('label', 'row-label');
label.setAttribute('for', field.key);
label.textContent = field.label;
row.appendChild(label);
var input = createElementWithClass('input', 'row-input');
input.id = field.key;
input.title = "Default Value: " + field.default;
if (field.type == 'float') {
input.size = 3;
input.type = 'number';
input.min = field.min || 0;
if (field.max) input.max = field.max;
if (field.step) input.step = field.step;
} else {
input.size = 40;
}
row.appendChild(input);
var units = createElementWithClass('div', 'row-units');
if (field.units)
units.innerHTML = field.units;
row.appendChild(units);
$('instant-form').appendChild(row);
}
}
/**
* Initialize the form by adding 'onChange' listeners to all fields.
*/
function initForm() {
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
$(field.key).onchange = (function(key) {
setPreferenceValue(key, $(key).value);
}).bind(null, field.key);
}
}
/**
* Request a preference setting's value.
* This method is asynchronous; the result is provided by a call to
* getPreferenceValueResult.
* @param {string} prefName The name of the preference value being requested.
*/
function getPreferenceValue(prefName) {
chrome.send('getPreferenceValue', [prefName]);
}
/**
* Handle callback from call to getPreferenceValue.
* @param {string} prefName The name of the requested preference value.
* @param {value} value The current value associated with prefName.
*/
function getPreferenceValueResult(prefName, value) {
$(prefName).value = value;
}
/**
* Set a preference setting's value.
* @param {string} prefName The name of the preference value being set.
* @param {value} value The value to be associated with prefName.
*/
function setPreferenceValue(prefName, value) {
chrome.send('setPreferenceValue', [prefName, value]);
}
/**
* Handle processing of "Reset" button.
* Causes off form values to be updated based on current preference values.
*/
function onReset() {
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
$(field.key).value = field.default;
setPreferenceValue(field.key, field.default);
}
return false;
}
/**
* Saves data back into Chrome preferences.
*/
function onSave() {
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
var value = $(field.key).value;
setPreferenceValue(
field.key, (field.type == 'float') ? parseFloat(value) : value);
}
return false;
}
function loadForm() {
for (var i = 0; i < FIELDS.length; i++)
getPreferenceValue(FIELDS[i].key);
}
/**
* Build and initialize the configuration form.
*/
function initialize() {
buildForm();
loadForm();
initForm();
$('reset-button').onclick = onReset.bind(this);
$('save-button').onclick = onSave.bind(this);
}
return {
initialize: initialize,
getPreferenceValueResult: getPreferenceValueResult
};
})();
document.addEventListener('DOMContentLoaded', instantConfig.initialize);
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