如何在ASP.NET上实现Google Places文本框预测?
问题描述:
我正在创建一个网站,我正在使用母版页,并且我想在我的内容页面中使用文本框预测。但预测不起作用。但我需要使用ASP控件而不是HTML来做到这一点。 我的代码是:如何在ASP.NET上实现Google Places文本框预测?
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false&libraries=places"></script>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false&libraries=places"></script>
<script type="text/javascript">
google.maps.event.addDomListener(window, 'load', function() {
var places = new google.maps.places.Autocomplete(document.getElementById('FromTxtBx'));
google.maps.event.addListener(places, 'place_changed', function() {
var place = places.getPlace();
var address = place.formatted_address;
var latitude = place.geometry.location.lat();
var longitude = place.geometry.location.lng();
var mesg = "Address: " + address;
mesg += "\nLatitude: " + latitude;
mesg += "\nLongitude: " + longitude;
alert(mesg);
});
});
</script> <br />
<div class="row">
<form class="col s10" runat="server">
<br />
<div class="input-field">
<div class="col s12 m4 l5">
<label for="last_name">FROM</label>
<asp:TextBox runat="server" id="FromTxtBx" class="validate"></asp:TextBox>
<asp:HiddenField runat="server" ID="FromPred" />
</div>
</div>
<div class="input-field col s7 push-s1">
<div class="col s12 m4 l8">
<label for="last_name1">TO</label>
<asp:TextBox runat="server" ID="last_name1"></asp:TextBox>
</div>
</div>
</form>
</div>
</asp:Content>
答
有两两件事要做:
- 您确认调用谷歌API发生?使用IE开发工具(按F12)或使用Fiddler查看呼叫
- 但是,如果#1正常工作,最可能的问题是您正在执行GetElementById并且由于您有母版页,因此可能该名称已扩展为像$ masterpage $ control $ fromtextbox之类的内容。这是为了避免命名碰撞。
右键点击你的页面,查看源代码并确认是的。如果是,请不要使用该名称,而应使用其他选择器。
答
尝试,只要你喜欢这样,这将让你在文本框中的所有地址元素,那么你可以调用的使用和隐藏这些文本框
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Place Autocomplete Address Form</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
</style>
<link type="text/css" rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500">
<style>
#locationField, #controls {
position: relative;
width: 480px;
}
#autocomplete {
position: absolute;
top: 0px;
left: 0px;
width: 99%;
}
.label {
text-align: right;
font-weight: bold;
width: 100px;
color: #303030;
}
#address {
border: 1px solid #000090;
background-color: #f0f0ff;
width: 480px;
padding-right: 2px;
}
#address td {
font-size: 10pt;
}
.field {
width: 99%;
}
.slimField {
width: 80px;
}
.wideField {
width: 200px;
}
#locationField {
height: 20px;
margin-bottom: 2px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<h1> Address Lookup </h1>
<div id="locationField">
<input id="autocomplete" placeholder="Enter your address"
onFocus="geolocate()" type="text"></input>
</div>
<table id="address">
<tr>
<td class="label">Street address</td>
<td class="slimField"><input class="field" id="street_number"
disabled="true"></input></td>
<td class="wideField" colspan="2"><input class="field" id="route"
disabled="true"></input></td>
</tr>
<tr>
<td class="label">City</td>
<td class="wideField" colspan="3"><input class="field" id="locality"
disabled="true"></input></td>
</tr>
<tr>
<td class="label">State</td>
<td class="slimField"><input class="field"
id="administrative_area_level_1" disabled="true"></input></td>
<td class="label">Zip code</td>
<td class="wideField"><input class="field" id="postal_code"
disabled="true"></input></td>
</tr>
<tr>
<td class="label">Country</td>
<td class="wideField" colspan="3"><input class="field"
id="country" disabled="true"></input></td>
</tr>
</table>
<script>
// This example displays an address form, using the autocomplete feature
// of the Google Places API to help users fill in the information.
// This example requires the Places library. Include the libraries=places
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">
var placeSearch, autocomplete;
var componentForm = {
street_number: 'short_name',
route: 'long_name',
locality: 'long_name',
administrative_area_level_1: 'short_name',
country: 'long_name',
postal_code: 'short_name'
};
function initAutocomplete() {
// Create the autocomplete object, restricting the search to geographical
// location types.
autocomplete = new google.maps.places.Autocomplete(
/** @type {!HTMLInputElement} */(document.getElementById('autocomplete')),
{ types: ['geocode'] });
// When the user selects an address from the dropdown, populate the address
// fields in the form.
autocomplete.addListener('place_changed', fillInAddress);
}
function fillInAddress() {
// Get the place details from the autocomplete object.
var place = autocomplete.getPlace();
for (var component in componentForm) {
document.getElementById(component).value = '';
document.getElementById(component).disabled = false;
}
// Get each component of the address from the place details
// and fill the corresponding field on the form.
for (var i = 0; i < place.address_components.length; i++) {
var addressType = place.address_components[i].types[0];
if (componentForm[addressType]) {
var val = place.address_components[i][componentForm[addressType]];
document.getElementById(addressType).value = val;
}
}
}
// Bias the autocomplete object to the user's geographical location,
// as supplied by the browser's 'navigator.geolocation' object.
function geolocate() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function (position) {
var geolocation = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
var circle = new google.maps.Circle({
center: geolocation,
radius: position.coords.accuracy
});
autocomplete.setBounds(circle.getBounds());
});
}
}
</script>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false&libraries=places&callback=initAutocomplete"
async defer></script>
</form>