php - jquery not working with if statement -


i using jquery script ajax update method bound focus event of form element. works, first want check if form element not empty. that, function stops working. below code:

<script type="text/javascript">     if ($('#txt_updateone').val().trim().length > 0) {         function single_change(txt_updateone) {             $.ajax({                 type: "post",                 data: { "txt_updateone": 1 },                 url: "single_scorechange.php",                 success: function (data) {                     $('#listinscore').load(document.url + '#listinscore');                  },                 error: function (xhr) {                     alert("error");                 }              });              return false;          }     } </script>

txt_updateone textarea , onfocus event calls single_change function. when remove if..... on second line, works, want work if textarea not empty.

there 2 methods.

1) validate data @ place calling function.

2) validate data before sending ajax request using beforesend.

<script type="text/javascript">     function single_change(txt_updateone) {         $.ajax({             type: "post",             data: { "txt_updateone": 1 },             url: "single_scorechange.php",             success: function (data) {                  $('#listinscore').load(document.url + '#listinscore');             },             beforesend: function(xhr) {                 alert("enter value");                 return $('#txt_updateone').val().trim().length > 0 ? true: false;             }             error: function (xhr) {                 alert("error");             }         });         return false;     } </script>

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