Home >Web Front-end >JS Tutorial >Sharing examples of writing Ajax request functions using native JS

Sharing examples of writing Ajax request functions using native JS

小云云
小云云Original
2017-12-23 15:25:081446browse

Generally when we write web pages, if we use Ajax to request the server, we use JQuery and other encapsulated libraries to call it, which is relatively simple. But generally these libraries have many functions and introduce too many things that we don't need. If we need to write a simple page with a single function, there is no need to reference such a huge library file. In this article, we mainly share with you the request function function of writing Ajax in native JS, hoping to help everyone.

We can simply implement our own Ajax request function. The specific code is as follows:


var ajax = {};
ajax.x = function () {
 if (typeof XMLHttpRequest !== 'undefined') {
 return new XMLHttpRequest();
 }
 var versions = [
 "MSXML2.XmlHttp.6.0",
 "MSXML2.XmlHttp.5.0",
 "MSXML2.XmlHttp.4.0",
 "MSXML2.XmlHttp.3.0",
 "MSXML2.XmlHttp.2.0",
 "Microsoft.XmlHttp"
 ];
 var xhr;
 for (var i = 0; i < versions.length; i++) {
 try {
 xhr = new ActiveXObject(versions[i]);
 break;
 } catch (e) {
 }
 }
 return xhr;
};
ajax.send = function (url, method, data, success,fail,async) {
 if (async === undefined) {
 async = true;
 }
 var x = ajax.x();
 x.open(method, url, async);
 x.onreadystatechange = function () {
 if (x.readyState == 4) {
 var status = x.status;
 if (status >= 200 && status < 300) {
 success && success(x.responseText,x.responseXML)
 } else {
 fail && fail(status);
 }
 }
 };
 if (method == &#39;POST&#39;) {
 x.setRequestHeader(&#39;Content-type&#39;, &#39;application/x-www-form-urlencoded&#39;);
 }
 x.send(data)
};
ajax.get = function (url, data, callback, fail, async) {
 var query = [];
 for (var key in data) {
 query.push(encodeURIComponent(key) + &#39;=&#39; + encodeURIComponent(data[key]));
 }
 ajax.send(url + (query.length ? &#39;?&#39; + query.join(&#39;&&#39;) : &#39;&#39;), &#39;GET&#39;, null, callback, fail, async)
};
ajax.post = function (url, data, callback, fail, async) {
 var query = [];
 for (var key in data) {
 query.push(encodeURIComponent(key) + &#39;=&#39; + encodeURIComponent(data[key]));
 }
 ajax.send(url,&#39;POST&#39;, query.join(&#39;&&#39;), callback, fail, async)
};

Usage method: GET


ajax.get(&#39;/test.php&#39;, {foo: &#39;bar&#39;}, function(response,xml) {
 //success
},
function(status){
 //fail
});
POST
ajax.post(&#39;/test.php&#39;, {foo: &#39;bar&#39;}, function(response,xml) {
 //succcess
},function(status){
 //fail
});

There is a problem that needs to be noted here. If we want to send something like


##

var sendCmd = "?op_code=" + code + "&op_cmd=" + cmd;
ajax.post(&#39;/control&#39; + sendCmd,&#39;&#39;,function(response,xml) {
 console.log(&#39;success&#39;);
},
function(status){
 console.log(&#39;failed:&#39; + status);
});

Related recommendations:


Comprehensive summary of related methods based on ajax in jQuery

Detailed explanation of the simple implementation of AJAX paging effect

Explanation of Ajax with examples Asynchronous request technology

The above is the detailed content of Sharing examples of writing Ajax request functions using native JS. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn