前面的話
雖然ajax全稱是asynchronous javascript and XML。但目前使用ajax技術(shù)時(shí),傳遞JSON已經(jīng)成為事實(shí)上的標(biāo)準(zhǔn)。因?yàn)橄噍^于XML而言,JSON簡(jiǎn)單且方便。本文將上一篇中的實(shí)例進(jìn)行改寫,以JSON的方式來(lái)進(jìn)行數(shù)據(jù)傳遞
前端頁(yè)面
!-- 前端頁(yè)面 -->
!DOCTYPE html>
html lang="en">
head>
meta charset="UTF-8">
title>Document/title>
style>
body{font-size: 20px;margin: 0;line-height: 1.5;}
select,button,input{font-size: 20px;line-height: 1.5;}
/style>
/head>
body>
h2>員工查詢/h2>
label>請(qǐng)輸入員工編號(hào):/label>
input type="text" id="keyword">
button id="search">查詢/button>
p id="searchResult">/p>
h2>員工創(chuàng)建/h2>
form id="postForm">
label>請(qǐng)輸入員工姓名:/label>
input type="text" name="name">br>
label>請(qǐng)輸入員工編號(hào):/label>
input type="text" name="number">br>
label>請(qǐng)輸入員工性別:/label>
select name="sex">
option value="男">男/option>
option value="女">女/option>
/select>br>
label>請(qǐng)輸入員工職位:/label>
input type="text" name="job">br>
button id="save" type="button">保存/button>
/form>
p id="createResult">/p>
script>
/*get*/
//查詢
var oSearch = document.getElementById('search');
//get方式添加數(shù)據(jù)
function addURLParam(url,name,value){
url += (url.indexOf("?") == -1 ? "?" : "");
url +=encodeURIComponent(name) + "=" + encodeURIComponent(value);
return url;
}
oSearch.onclick = function(){
//創(chuàng)建xhr對(duì)象
var xhr;
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject('Microsoft.XMLHTTP');
}
//異步接受響應(yīng)
xhr.onreadystatechange = function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
//實(shí)際操作
var data = JSON.parse(xhr.responseText);
if(data.success){
document.getElementById('searchResult').innerHTML = data.msg;
}else{
document.getElementById('searchResult').innerHTML = '出現(xiàn)錯(cuò)誤:' +data.msg;
}
}else{
alert('發(fā)生錯(cuò)誤:' + xhr.status);
}
}
}
//發(fā)送請(qǐng)求
var url = 'service.php';
url = addURLParam(url,'number',document.getElementById('keyword').value);
xhr.open('get',url,true);
xhr.send();
}
/*post*/
//創(chuàng)建
var oSave = document.getElementById('save');
//post方式添加數(shù)據(jù)
function serialize(form){
var parts = [],field = null,i,len,j,optLen,option,optValue;
for (i=0, len=form.elements.length; i len; i++){
field = form.elements[i];
switch(field.type){
case "select-one":
case "select-multiple":
if (field.name.length){
for (j=0, optLen = field.options.length; j optLen; j++){
option = field.options[j];
if (option.selected){
optValue = "";
if (option.hasAttribute){
optValue = (option.hasAttribute("value") ? option.value : option.text);
} else {
optValue = (option.attributes["value"].specified ? option.value : option.text);
}
parts.push(encodeURIComponent(field.name) + "=" + encodeURIComponent(optValue));
}
}
}
break;
case undefined: //fieldset
case "file": //file input
case "submit": //submit button
case "reset": //reset button
case "button": //custom button
break;
case "radio": //radio button
case "checkbox": //checkbox
if (!field.checked){
break;
}
/* falls through */
default:
//don't include form fields without names
if (field.name.length){
parts.push(encodeURIComponent(field.name) + "=" + encodeURIComponent(field.value));
}
}
}
return parts.join("");
}
oSave.onclick = function(){
//創(chuàng)建xhr對(duì)象
var xhr;
if(window.XMLHttpRequest){
xhr = new XMLHttpRequest();
}else{
xhr = new ActiveXObject('Microsoft.XMLHTTP');
}
//異步接受響應(yīng)
xhr.onreadystatechange = function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
//實(shí)際操作
var data = JSON.parse(xhr.responseText);
if(data.success){
document.getElementById('createResult').innerHTML = data.msg;
}else{
document.getElementById('createResult').innerHTML = '出現(xiàn)錯(cuò)誤:'+data.msg;
}
}else{
alert('發(fā)生錯(cuò)誤:' + xhr.status);
}
}
}
//發(fā)送請(qǐng)求
xhr.open('post','service.php',true);
xhr.setRequestHeader("content-type","application/x-www-form-urlencoded");
xhr.send(serialize(document.getElementById('postForm')));
}
/script>
/body>
/html>
后端頁(yè)面
?php
//用于過(guò)濾不安全的字符
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
//設(shè)置頁(yè)面內(nèi)容的html編碼格式是utf-8
header("Content-Type:application/json;charset=utf-8");
//定義一個(gè)多維數(shù)組,包含員工的信息,每條員工信息為一個(gè)數(shù)組
$staff = array(
array("name"=>"洪七","number"=>"101","sex"=>"男","job"=>'總經(jīng)理'),
array("name"=>"郭靖","number"=>"102","sex"=>"男","job"=>'開發(fā)工程師'),
array("name"=>"黃蓉","number"=>"103","sex"=>"女","job"=>'產(chǎn)品經(jīng)理')
);
//判斷如果是get請(qǐng)求,則進(jìn)行搜索;如果是POST請(qǐng)求,則進(jìn)行新建
//$_SERVER["REQUEST_METHOD"]返回訪問(wèn)頁(yè)面使用的請(qǐng)求方法
if($_SERVER["REQUEST_METHOD"] == "GET"){
search();
}else if($_SERVER["REQUEST_METHOD"] == "POST"){
create();
}
//通過(guò)員工編號(hào)搜索員工
function search(){
//檢查是否有員工編號(hào)的參數(shù)
//isset檢測(cè)變量是否設(shè)置;empty判斷值是否為空
if(!isset($_GET['number']) || empty($_GET['number'])){
echo '{"success":false,"msg":"參數(shù)錯(cuò)誤"}';
return;
}
global $staff;
$number = test_input($_GET['number']);
$result = '{"success":false,"msg":"沒有找到員工"}';
//遍歷$staff多維數(shù)組,查找key值為number的員工是否存在。如果存在,則修改返回結(jié)果
foreach($staff as $value){
if($value['number'] == $number){
$result = '{"success":true,"msg":"找到員工:?jiǎn)T工編號(hào)為' .$value["number"] .',員工姓名為' .$value["name"] .',員工性別為' .$value["sex"] .',員工職位為' .$value["job"] .'"}';
break;
}
}
echo $result;
}
//創(chuàng)建員工
function create(){
//判斷信息是否填寫完全
if(!isset($_POST['name']) || empty($_POST['name']) ||
!isset($_POST['number']) || empty($_POST['number']) ||
!isset($_POST['sex']) || empty($_POST['sex']) ||
!isset($_POST['job']) || empty($_POST['job'])
){
echo '{"success":false,"msg":"參數(shù)錯(cuò)誤,員工信息填寫不全"}';
return;
}
echo '{"success":true,"msg":"員工' .test_input($_POST['name']) .'信息保存成功!"}';
}
?>
實(shí)例演示
以上所述是小編給大家介紹的Ajax 傳遞JSON實(shí)例代碼,希望對(duì)大家有所幫助,如果大家有任何疑問(wèn)請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持!
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