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[英]How to post both a javascript variable and a html form via $.ajax post?
[英]How do i send the form parametrs of an html form via javascript Ajax POST?
我有一個帶有ajax按鈕的html表單(請參見下面的代碼)。 我想通過AJAX發布發送表單參數。
我的問題是我不確定如何定位HTML表單字段的值(用戶插入的值)。
如何使用JavaScript通過ajax發布發送HTML參數?
僅供參考:我不想使用formData。
這是代碼:
<body>
<form id="my-form-id" method="post" action="Calendar_form3.php">
Year:<INPUT NAME="gregorian_year" SIZE=4 MAXLENGTH=4 value="2016">(1-6000)
Latitude: <INPUT NAME="latitude" value="40.7127">
Longitude: <INPUT NAME="longitude" value="-74.0059">
<button id="ajax-button" type="button">Ajax button</button>
</form>
<script>
function displayCalendar() {
var divtarget = document.getElementById("main");
var xhr = new XMLHttpRequest();
xhr.open('post', 'Calendar_form3.php', true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function () {
console.log('readyState: ' + xhr.readyState);
if (xhr.readyState == 2) {
divtarget.innerHTML = 'LOADING';
}
if (xhr.readyState == 4 && xhr.status == 200) {
var text = xhr.responseText;
divtarget.innerHTML = text;
}
}
xhr.send(gregorian_year=???&latitude=???&longitude=???);
}
var button = document.getElementById("ajax-button");
button.addEventListener("click", displayCalendar);
</script>
<div id='main'>
result here
</div>
</body>
這是Calendar_form3.php
頁面中的代碼:
<?php
echo "ajax working!!";
echo $_POST['gregorian_year'] . $_POST['latitude']. $_POST['longitude'];
?>
我如何完成此代碼行:
xhr.send(gregorian_year=???&latitude=???&longitude=???);
換句話說,給定我的HTML表單,如何使用JavaScript通過AJAX發布發送html參數?
function displayCalendar() {
var divtarget = document.getElementById("main");
var xhr = new XMLHttpRequest();
//Get Input Values
var lon = document.getElementsByName('longitude')[0].value;
var lat = document.getElementsByName('latitude')[0].value;
var ger = document.getElementsByName('gregorian_year')[0].value;
//make the params string
var params = "latitude=" + lat + "&longitude=" + lon + "&gregorian_year=" + ger;
//Initialize as POST
xhr.open("POST", 'Calendar_form3.php', true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function () {
console.log('readyState: ' + xhr.readyState);
if (xhr.readyState == 2) {
divtarget.innerHTML = 'LOADING';
}
if (xhr.readyState == 4 && xhr.status == 200) {
var text = xhr.responseText;
divtarget.innerHTML = text;
}
}
//Send
xhr.send(params);
}
首先,使用getElementsByName()
DOM方法獲取gregorian_year , 緯度和經度字段值,如下所示:
var gregorian_year = document.getElementsByName("gregorian_year")[0].value;
var latitude = document.getElementsByName("latitude")[0].value;
var longitude = document.getElementsByName("longitude")[0].value;
然后在AJAX的send()
方法中使用這些變量,如下所示:
xhr.send("gregorian_year="+gregorian_year+'&latitude='+latitude+'&longitude='+longitude);
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