[英]Start and stop AJAX by selecting radio buttons
我的表格很小,只有兩個單選按鈕。 要打開自動檢查,然后將其禁用:
<form class="user-containter-form">
<input type="radio" id="refreshOn" name="perCheck" value="on" checked="checked">Periodic Checking On<br>
<input type="radio" id="refreshOff" name="perCheck" value="off" onclick="alert('hello');" onclick="getTweets()">Periodic Checking Off
</form>
我有一個AJAX請求,用於實際獲取信息。
if(document.getElementById('refreshOn').checked) {
setInterval(function () {sendRequest()}, 2000);
function sendRequest(){
var xmlhttp;
if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == XMLHttpRequest.DONE ) {
if(xmlhttp.status == 200){
document.getElementById("test").innerHTML=xmlhttp.responseText;
} else if(xmlhttp.status == 400) {
alert('There was an error 400')
} else {
alert('something else other than 200')
}
}
}
xmlhttp.open("GET","getTweets.php?",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send();
}
}
默認情況下,我將其設置為on,但是我希望用戶能夠禁用刷新。 我該如何實現?
您的html變為:
<input type="radio" id="refreshOff" name="perCheck" value="off" onclick="disableAutoRefresh();" onclick="getTweets()">Periodic Checking Off
您聲明全局新變量並定義新函數:
var autoRefresh = true
function disableAutoRefresh(){
autoRefresh = false;
}
您修改代碼
if(document.getElementById('refreshOn').checked) {
setInterval(function () {if (autoRefresh) sendRequest()}, 2000);
//rest of your code
//...
}
將間隔設置為變量,並根據用戶輸入清除變量
var theInterval;
if(document.getElementById('refreshOn').checked) {
theInterval = setInterval(function () {sendRequest()}, 2000);
function sendRequest(){
var xmlhttp;
if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == XMLHttpRequest.DONE ) {
if(xmlhttp.status == 200){
document.getElementById("test").innerHTML=xmlhttp.responseText;
} else if(xmlhttp.status == 400) {
alert('There was an error 400')
} else {
alert('something else other than 200')
}
}
}
xmlhttp.open("GET","getTweets.php?",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send();
}
}
$('input').click(function(){
if(document.getElementById('refreshOff').checked){
clearInterval(theInterval);
}
});
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