📄 hacks4_1.js
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var map = null;window.onload=function(){ createMap(); document.getElementById("submit").onclick=function(){ getDirections(document.forms[0]._street.value, document.forms[0]._city.value, document.forms[0]._state.value, document.forms[0]._dname.value, document.forms[0]._latitude.value, document.forms[0]._longitude.value); }; document.getElementById("rem_bubbles").onclick=function(){ clearOverlays(); };};function createMap(){ map = new GMap(document.getElementById("map")); GEvent.addListener(map, 'click', function(overlay, point) { document.forms[0]._longitude.value=point.x; document.forms[0]._latitude.value=point.y; map.addOverlay(new GMarker(point)); }); map.addControl(new GLargeMapControl()); map.addControl(new GMapTypeControl()); //center on roughly middle of USA continent map.centerAndZoom(new GPoint(-97.20703, 40.580584), 14);}function clearOverlays(){ if(map != null){ map.clearOverlays(); }}function getDirections(street,city,state, destName,lat,lng){ var _str = encodeURIComponent(street); var _cit = encodeURIComponent(city); var url = "http://www.parkerriver.com/s/dd?"+_str+"&tlt="+ lat+"&tln="+lng+"&csz="+ _cit+"%2C"+state+"&country=us&tname="+destName; httpRequest("GET",url,true);}//event handler for XMLHttpRequestfunction handleResponse(){ try{ if(request.readyState == 4){ if(request.status == 200){ var _dirs = request.responseText; var targDoc = parent.frames[1].document; targDoc.open(); targDoc.write('<html><head><title></title></head><body>'+ _dirs+'<p><form><button type=\"button\" onclick=\"window.print()\">Print Directions</button></form></p></body></html>'); targDoc.close(); //doesn't work: var div = targdoc.getElementById("dirs"); } else { //request.status is 503 if the application isn't available; 500 if the application has a bug alert("A problem occurred with communicating between the XMLHttpRequest object and the server program."); } }//end outer if } catch (err) { alert("It does not appear that the server is available for this application. Please"+ " try again very soon. \nError: "+err.message); }}/* Initialize a Request object that is already constructed */function initReq(reqType,url,bool){ try{ /* Specify the function that will handle the HTTP response */ request.onreadystatechange=handleResponse; request.open(reqType,url,bool); request.send(null); } catch (errv) { alert( "The application cannot contact the server at the moment. "+ "Please try again in a few seconds." ); }}/* Wrapper function for constructing a Request object. Parameters: reqType: The HTTP request type such as GET or POST. url: The URL of the server program. asynch: Whether to send the request asynchronously or not. */function httpRequest(reqType,url,asynch){ //Mozilla-based browsers if(window.XMLHttpRequest){ request = new XMLHttpRequest(); } else if (window.ActiveXObject){ request=new ActiveXObject("Msxml2.XMLHTTP"); if (! request){ request=new ActiveXObject("Microsoft.XMLHTTP"); } } //the request could still be null if neither ActiveXObject //initializations succeeded if(request){ initReq(reqType,url,asynch); } else { alert("Your browser does not permit the use of all "+ "of this application's features!");}}⌨️ 快捷键说明
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