Google(Local)SearchAPI的简单使用介绍_javascript技巧

下面简单介绍一下这次我用到的几个函数吧。

•构造函数google.search.LocalSearch()

这其实是创建了一个LocalSearch的Service，这个Service和其他Service（News, Blog, Web）一样，是供SearchControl使用的。这些Service决定了SearchControl的能力。

•设置LocalSearch的搜索结构类型

localSearch.setRestriction(google.search.Search.RESTRICT_TYPE, google.search.LocalSearch.TYPE_KMLONLY_RESULTS)

这说明搜索的结果没有business的结果，只有kml和geocode结果

•设置LocalSearch的搜索范围

localSearch.setCenterPoint("北京");

•google.search.SearcherOptions()

设置Search Service(Searcher)的属性，作为SearchControl.addSearcher()的一个属性使用，有以下选项可以选择：

1.设置结果的显示方式
•searcherOptions.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);

2. 设置档没有搜索结果时显示的文字

• searcherOptions.setNoResultsString(google.search.SearchControl.NO_RESULTS_DEFAULT_STRING);

3. 设置结果显示的位置

•searcherOptions.setRoot(resultCanvas);

•new google.search.DrawOptions();

设置Google Search Control的显示方式

•drawOptions.setDrawMode(google.search.SearchControl.DRAW_MODE_TABBED)

设置显示方式为tabbed方式，即各个Searcher像tabs一样显示

•drawOptions.setInput(document.getElementById("input"));

将搜索输入框的默认值改为用户自定义的一个输入框

将用户选择搜索结果作为一个相应的GResult对象返回，如LocalSearch的GResult就是一个GLocalResult。

这个选项费了我很长时间才找到，原因有二，一是用的人少，文档少。二是我看的英文文档，花了挺长时间才看明白，其实看中文文档要花的时间更长，我觉得。

•searchControl.setOnKeepCallback(this, LocalSearchKeepHandler);

顺便贴上LocalSearchKeepHandler的代码，其参数为自动返回的那个GResult对象。
代码如下:
function LocalSearchKeepHandler(result) {
var from = document.getElementById("from");
alert("result.tilte = " + result.title);
from.value = ProcessString(result.title);
alert("from.value = " + from.value);
// alert(result.title);
}

干脆把这段代码整体贴出，方便阅读
代码如下:
google.load("search", "1", {"language": "zh-CN"});
function initialize() {
//LocalSearch Object used to create a local search service for the maps
var localSearch = new google.search.LocalSearch();
//restrict the local search resutls to kml and geocode results only, no business ones
localSearch.setRestriction(google.search.Search.RESTRICT_TYPE, google.search.LocalSearch.TYPE_KMLONLY_RESULTS);
// Set the Local Search center point
localSearch.setCenterPoint("北京");
//It's about local search, which are used to set where the results will appear, a param of options
var resultCanvas = document.getElementById("resultCanvas");
//options: open, alternate root
var searcherOptions = new google.search.SearcherOptions();
//show many results
searcherOptions.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);
//no results message
searcherOptions.setNoResultsString(google.search.SearchControl.NO_RESULTS_DEFAULT_STRING);
//options.setDrawMode(google.search.SearchControl.DRAW_MODE_TABBED);//web, local... in a tab show
searcherOptions.setRoot(resultCanvas); //show the results in another place--
//SearchControl Object used to create a search service which will include a local search service
var searchControl = new google.search.SearchControl(null);
searchControl.addSearcher(localSearch, searcherOptions);
searchControl.addSearcher(new google.search.WebSearch());
searchControl.addSearcher(new google.search.NewsSearch());
searchControl.addSearcher(new google.search.BlogSearch());
//draw options and set it to a tabbed view,
var drawOptions = new google.search.DrawOptions();
drawOptions.setDrawMode(google.search.SearchControl.DRAW_MODE_TABBED)
//make the searchControl return a result:GResult
searchControl.setOnKeepCallback(this, LocalSearchKeepHandler);//keeping a search result
//this option is used to set the search box position in a DOM tree.
//drawOptions.setSearchFormRoot(document.getElementById("drawOptions"));
//set the input box to a user defined element
//drawOptions.setInput(document.getElementById("input"));
// tell the search box to draw itself and tell it where to attach
// searchControl.draw(document.getElementById("searchBox"), drawOptions);//Here I changed fromaddress and toaddress to search, a new place
//another user defined input box
drawOptions.setInput(document.getElementById("input2"));
searchControl.draw();
/** The codes below is about google Ajax Map Search API
//this code segment is used to add a sidebar to show the results of the search
//I wonder why no 'var' exists here
optinos = new Object();
options.resultList = resultCanvas;
options.resultFormat = "multi-line1";
var lsc2 = new google.elements.LocalSearch(options);
map.addControl(lsc2, new GControlPosition(G_ANCHOR_TOP_LEFT, new GSize(-282, -2)));
*/
}
google.setOnLoadCallback(initialize);