Raw Ajax vs. Ajax in jQuery
Original Ajax and Ajax in jQuery
First, let’s take a look at how simple it is to implement Ajax with jQuery through an example. Here is an example using raw Ajax:
<!doctype html><html><head>
<meta charset="utf-8"/>
<title>jQuery Ajax</title>
<script src="http://code.jquery.com/jquery-3.1.1.min.js"></script>
<script>
$(function() { var xhr = new AjaxXmlHttpRequest();
$("#btnAjaxOld").click(function(event) { var xhr = new AjaxXmlHttpRequest();
xhr.onreadystatechange = function() { if (xhr.readyState == 4) { document.getElementById("divResult").innerHTML = xhr.responseText;
}
} //由于涉及到同源策略，需要服务器端的支持
xhr.open("GET", "data/AjaxGetCityInfo.aspx?resultType=html", true);
xhr.send(null);
});
}); //跨浏览器获取 XmlHttpRequest 对象
function AjaxXmlHttpRequest() { var xmlHttp; try { // Firefox, Opera 8.0+, Safari
xmlHttp = new XMLHttpRequest();
} catch (e) { // Internet Explorer
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) { try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
alert("Your browser nonsupport AJAX！"); return false;
}
}
} return xmlHttp;
} </script></head><body>
<button id="btnAjaxOld">original ajax call</button>
<div id="divResult"></div>
</body>
</html>In the above example, the data/AjaxGetCityInfo.aspx?resultType=html address will return a piece of HTML code.
Using original Ajax, we need to do more things, such as Create XmlHttpRequest object, determine the request status, write callback functions, etc.
With jQuery's Load method, you only need one sentence:
$("#divResult").load("data/AjaxGetCityInfo.aspx", { "resultType": "html" });Now I just use jQuery's Ajax function, and my page has become simpler:
<!doctype html><html lang="zh"><head>
<meta charset="utf-8"/>
<title>jQuery Ajax</title>
<script src="http://code.jquery.com/jquery-3.1.1.min.js"></script>
<script>
$(function() {
$("#btnAjaxJquery").click(function(event) {
$("#divResult").load("data/AjaxGetCityInfo.aspx", { "resultType": "html" });
});
})
</script></head><body>
<button id="btnAjaxJquery">use jQuery load method</button>
<div id="divResult"></div>
</body>
</html>
new file
<!doctype html><html><head>
<meta charset="utf-8"/>
<title>jQuery Ajax</title>
<script src="http://code.jquery.com/jquery-3.1.1.min.js"></script>
<script>
$(function() { var xhr = new AjaxXmlHttpRequest();
$("#btnAjaxOld").click(function(event) { var xhr = new AjaxXmlHttpRequest();
xhr.onreadystatechange = function() { if (xhr.readyState == 4) { document.getElementById("divResult").innerHTML = xhr.responseText;
}
} //由于涉及到同源策略，需要服务器端的支持
xhr.open("GET", "data/AjaxGetCityInfo.aspx?resultType=html", true);
xhr.send(null);
});
}); //跨浏览器获取 XmlHttpRequest 对象
function AjaxXmlHttpRequest() { var xmlHttp; try { // Firefox, Opera 8.0+, Safari
xmlHttp = new XMLHttpRequest();
} catch (e) { // Internet Explorer
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) { try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
alert("Your browser nonsupport AJAX！"); return false;
}
}
} return xmlHttp;
} </script></head><body>
<button id="btnAjaxOld">original ajax call</button>
<div id="divResult"></div>
</body>
</html>
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