jquery Selector Quick Extract Web Form data sample

  When you have to repeat the same thing many times, you want to find a time-saving method, and here's a quick way to extract Web form data using the jquery selector

I am lazy, when doing the web, when encountered to repeat the same thing many times, want to find a time-saving method.     Prior to submitting the form in the web and need to validate user input, when extracting user input information, it is necessary to use document.getElementById () in JS, so that a two-form field is OK, But there are a lot of times (I have encountered more than 10 of cases) to see all the dizziness, so the individual is more disgusted with this way, but fortunately, I myself blindly pondering, using jquery found a convenient way.     I add an additional attribute to each form field that needs to submit the data, replacing the original name property with its own additional defined attribute "_postfield", such as <input type= "text" _postfield= "name"/ ><input type= "Radio" _postfield= "sex"/> and so on, and then use query to get all the DOM objects that have _postfield properties and traverse them, encapsulated in the value of _postfield as key, Its content is value of the JSON key values pair, its JS method is as follows:    code as follows: <script type= "text/javascript>  function Getformfield (SEL) {  var Objs = $ ("*[" +sel+ "]");  var postdata = {};  for (var i=0,len=objs.length;i<len;i++) {  var ob j = objs[i];  var nodename = obj.nodeName.toLowerCase ();  var field = $ (obj). attr (SEL);    if (nodename = = "Input") {  if (Obj.type.trim () = "Radio" && (obj.checked| | obj.checked== "Checked")) {    Postdata[field] = $ (obj). val ();  continue; }  if (Obj.type.trim () = = "checkbox" && (obj.checked| | obj.checked== "Checked") {  var ov = postdata[field]| | "";   var NV = ov+ "," +$ (obj). val ();  Postdata[field] = Nv.replace (/^,+/, "");  continue; }    I F (obj.type.trim () = = "Text" | | Obj.type.trim () = = "hidden") {  Postdata[field] = $ (obj). val ();  continue; }    continue;  }    if (nodename== "textarea") {  Postdata[field] = $ (obj). val ();  continue; }  & nbsp if (nodename== "select") {  var val = obj.options[obj.selectedindex].value;  Postdata[field] = val;  continue; }    Postdata[field] = $ (obj). html ();   }   //return JSON data to get data from form   return postdata; }  </script>    test Code:  code is as follows: <form style= "margin-left:200px; margin-top:300px; " >  <input type= "text" value= "_postfield=" name "/><br/><br/>  <input type=" Radio " Value= "male" name= "sex" _postfield= "sex"/> male   <input tyPe= "Radio" value= "name=" Sex "_postfield=" sex "/> Women   <input type=" Radio "value=" neutral "name=" sex "_postfield=" Sex "/> Neutral <br/><br/>  <select _postfield=" Job ">  <option value=" Work "> Work </ option>  <option value= "begging" > Begging </option>  <option value= "Nothing is irrelevant" > nothing. </option>   </select>  <br/><br/>  <input type= "button" value= "OK" onclick= "test ();"/>& nbsp </form>  <script>  function Test () {  var postdata = Getformfield ("_postfield");    var sb = [];  for (var o in postdata) {  sb.push (o+ "=" +postdata[o]); }  alert (Sb.join ("n")); &nb Sp }  </script>