javascript - How to supply value to jquery ajax variable via a FORM? -


how can following modified forminput textarea form box accepts user input, rather hard coded now?

once form submitted, populate forminput in following code:

data: json.stringify({json:*forminput*}),

in textarea box, data pasted in in javascript below.

<html> <head>     <title></title> </head> <body> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" type="text/javascript"></script> <script type="text/javascript">      $(document).ready(function () {         $("#postit").on("click", function () {              var forminput = [{                   "field1":"100",                   "field2":"2000",                   "field3":"400",                 },                 {                   "field1":"110",                   "field2":"2200",                   "field3":"520"                 }];               $.ajax({                 type: "post",                 contenttype: "application/json; charset=utf-8",                 url: "http://localhost/capturedata",                 data: json.stringify({json:forminput}),                 datatype: 'json',                 success: function (data) {                  }             });         });     }); </script> <a href="#" id="postit">submit</a>  </body> </html>

the whole idea doesn't make sense because user might enter value not valid json. in question said "data pasted in in javascript below" - if isn't? or if user enters is valid json isn't remotely format you're expecting? user might enter {"this":"is valid json"} , accepted , submitted not server expecting.

having said that, take requirement literally implement adding following somewhere on page:

<textarea id="forminput"></textarea>

and in js function value with:

var forminput = $("#forminput").val();

...which give value string. if wanted use object use forminput variable shown in question it'd need be:

var forminput = $.parsejson( $("#forminput").val() );

so address point user entering invalid values, this:

try {     var forminput = $.parsejson( $("#forminput").val() );     // use forminput } catch (e) {     alert("invalid input: " + e.message); }

...but catch general invalid json errors, won't catch cases user has entered valid json of wrong format needs.


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