Three data types returned by the ajax processing server, ajax Data Types

Three data types returned by the ajax processing server, ajax Data Types

The principle is very simple and the structure remains unchanged. It only changes the way data is returned.

1. Text/HTML format
The processing of such return types is simple and can be directly used as strings. For ease of use, it is encapsulated into the following functions:

/*** @ Function use ajax to dynamically exchange data (in Text/HTML format) * @ param url the page on which the request is to be submitted * @ param jsonData the data to be submitted, use Json to pass * @ param getMsg. This function can obtain the processed data */function ajaxText (url, jsonData, getMsg) {// create an Ajax object. ActiveXObject is compatible with IE5, 6 var oAjax = window. XMLHttpRequest? New XMLHttpRequest (): new ActiveXObject ("Microsoft. XMLHTTP "); // open the request to oAjax. open ('post', url, true); // method, URL, asynchronous transmission // send request var data = ''; for (var d in jsonData) // assemble data + = (d + '=' + jsonData [d] + '&'); oAjax. setRequestHeader ("Content-type", "application/x-www-form-urlencoded"); oAjax. send (data); // receives the response. oAjax is triggered when something is returned on the server. onreadystatechange = function () {if (oAjax. readyState = 4 & oAjax. status = 200) {if (getMsg) getMsg (oAjax. responseText );}}}

The data format returned by the server is as follows:
For example:

// The returned result is in xml format // header ("Content-Type: text/xml; charset = UTF-8"); // The returned result is in text or Json format header ("Content-Type: text/html; charset = UTF-8 "); // disable caching to ensure normal data submission, rather than caching data headers (" Cache-Control: no-cache "); $ username =$ _ POST ['username']; // obtain the username if (empty ($ username) echo 'enter username '; else if ($ username = 'acme') echo 'user name registered '; else echo 'user name available ';

The call format is as follows:

url = 'abc.php';var jsonData={username:'acme',passw:'acme'};ajaxText(url,jsonData,getMsg);function getMsg(msg){ //do something}

2. XML format

The returned result is an xml dom object. parsing the data is similar to html dom programming. for example, you can use name to obtain the tag object (in the array form), obtain the expected tag object from the array, and then obtain the text value from the tag object.
The function is as follows:

/*** @ Function use ajax to dynamically exchange data (in XML format) * @ param url the page on which the request is to be submitted * @ param jsonData the data to be submitted, use Json to pass * @ param tagName the tag name for obtaining the value * @ param getMsg this function can get the processed data */function ajaxXML (url, jsonData, tagName, getMsg) {// create an Ajax object. ActiveXObject is compatible with IE5 and 6 var oAjax = window. XMLHttpRequest? New XMLHttpRequest (): new ActiveXObject ("Microsoft. XMLHTTP "); // open the request to oAjax. open ('post', url, true); // method, URL, asynchronous transmission // send request var data = ''; for (var d in jsonData) // assemble data + = (d + '=' + jsonData [d] + '&'); oAjax. setRequestHeader ("Content-type", "application/x-www-form-urlencoded"); oAjax. send (data); // receives the response. oAjax is triggered when something is returned on the server. onreadystatechange = function () {if (oAjax. readyState = 4 & oAjax. status = 200) {var oXml = oAjax. responseXML; // The returned xml dom object var oTag = oXml. getElementsByTagName (tagName); var tagValue = oTag [0]. childNodes [0]. nodeValue; if (getMsg) getMsg (tagValue );}}}

The data format returned by the server is as follows:
For example:

// The returned header is in xml format ("Content-Type: text/xml; charset = UTF-8"); // The returned header is in text or Json format ("Content-Type: text/html; charset = UTF-8 "); // disable caching to ensure normal data submission, rather than caching data headers (" Cache-Control: no-cache "); $ username = $ _ POST ['username']; // obtain the username if (empty ($ username )) echo '<user> <mes> enter the user name </mes> </user>'; // These tags can be customized to else if ($ username = 'acme ') echo '<user> <mes> user name registered </mes> </user> '; else echo '<user> <mes> user Name available </mes> </user> ';

The call format is as follows:

var url = 'abc.php';var jsonData = {username:'acme'};ajaxXML(url,jsonData,'mes',getMsg);function getMsg(msg) {   //do something }

3. Return json

The function is as follows:

/*** @ Function uses ajax to dynamically exchange data (in Text/HTML format ), however, the returned text data is Json. * @ param url refers to the page on which the request is to be submitted * @ param jsonData refers to the data to be submitted, use Json to pass * @ param getMsg. This function can obtain the processed data */function ajaxJson (url, jsonData, getMsg) {// create an Ajax object. ActiveXObject is compatible with IE5, 6 var oAjax = window. XMLHttpRequest? New XMLHttpRequest (): new ActiveXObject ("Microsoft. XMLHTTP "); // open the request to oAjax. open ('post', url, true); // method, URL, asynchronous transmission // send request var data = ''; for (var d in jsonData) // assemble data + = (d + '=' + jsonData [d] + '&'); oAjax. setRequestHeader ("Content-type", "application/x-www-form-urlencoded"); oAjax. send (data); // receives the response. oAjax is triggered when something is returned on the server. onreadystatechange = function () {if (oAjax. readyState = 4 & oAjax. status = 200) {var json = eval ('+ oAjax. responseText + '); // parses the passed string into a json object if (getMsg) getMsg (json );}}}

The data format returned by the server is as follows:

For example:

// The returned result is in xml format // header ("Content-Type: text/xml; charset = UTF-8"); // The returned result is in text or Json format header ("Content-Type: text/html; charset = UTF-8 "); // disable caching to ensure normal data submission, rather than caching data headers (" Cache-Control: no-cache "); $ username =$ _ POST ['username']; // obtain the username if (empty ($ username) echo '{" mes ": "Enter the user name"} '; else if ($ username = 'acme') echo' {"mes": "The user name has been registered "}'; else echo '{"mes": "User Name available "}';

The call format is as follows:

url = 'abc.php';var jsonData={username:'acme',passw:'acme'};ajaxText(url,jsonData,getMsg);function getMsg(msg){ //do something}

For ease of use, you can merge the three functions. The combined functions are as follows:

/*** @ Function use ajax to dynamically exchange data * @ param url the page on which the request is to be submitted * @ param jsonData the data to be submitted, use Json to pass * @ param getMsg. This function can obtain the processed data * @ param type, when text/xml/json * @ param tagName type = xml, this parameter is set to the Tag Name of the text to be obtained * @ return none */function ajax (url, jsonData, getMsg, type, tagName) {// create an Ajax object. ActiveXObject is compatible with IE5, 6 var oAjax = window. XMLHttpRequest? New XMLHttpRequest (): new ActiveXObject ("Microsoft. XMLHTTP "); // open the request to oAjax. open ('post', url, true); // method, URL, asynchronous transmission // send request var data = ''; for (var d in jsonData) // assemble data + = (d + '=' + jsonData [d] + '&'); oAjax. setRequestHeader ("Content-type", "application/x-www-form-urlencoded"); oAjax. send (data); // receives the response. oAjax is triggered when something is returned on the server. onreadystatechange = function () {if (oAjax. readyState = 4 & oAjax. status = 200) {if (type = 'text') {if (getMsg) getMsg (oAjax. responseText);} else if (type = 'json') {var json = eval ('+ oAjax. responseText + '); // parses the passed string into a json object if (getMsg) getMsg (json);} else if (type = 'xml ') {var oXml = oAjax. responseXML; // The returned xml dom object var oTag = oXml. getElementsByTagName (tagName); var tagValue = oTag [0]. childNodes [0]. nodeValue; if (getMsg) getMsg (tagValue );}}}}

The above is all the content of this article. I hope it will be helpful for your learning and support for helping customers.