jquery - PHP doesn't receive $_POST -

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i have problem php, i'm doing ajax post jquery. problem: php doesnt receive post, there no problems. i'm using last jquery version. ajax doesnt throw error, tried error:function(...) , console.log.

idcat number, example: 3 $nuevafila , other undeclared variables declared, aren't constructive.

php returns html because try html , receive ok

the ajax code one:

$.ajax({     cache:false,     type:'post',     url:'admin/categoria_ajax_ad',     data: {id: idcat},     success: function(htmlfila) {                var nfila=$cfilas.find(".fila").size()+1;         $nuevafila.html(htmlfila);         $nuevafila.appendto($cfilas);     }, });

try using datatype (xml, json, script, or html) setting parameter depending on return data type -

$.ajax({ cache:false, type:'post', url:'admin/categoria_ajax_ad', data: {id: idcat}, datatype : "string" success: function(htmlfila) {            var nfila=$cfilas.find(".fila").size()+1;     $nuevafila.html(htmlfila);     $nuevafila.appendto($cfilas);     }, });

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