javascript - jquery function returns true but cannot process the return value -
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- how return response asynchronous call? 21 answers
hi guys here code function checks if id present in database
function checkifuploaded(citenr) { $.ajax({ type: "post", url: "locationsdb.asmx/checkifexist", data: '{"citenr": "' + citenr + '"}', contenttype: "application/json; charset=utf-8", datatype: "json", success: function (response) { if (response.d) { return true; } else { return false; } //setinfo(); }, failure: function (response) { alert(response.d); } }); } now have function using function above
function plotnew(lat, lng) { $('#latt').val(lat); $('#longt').val(lng); $("#panel2").dialog({ resizable: false, height: 350, width: 600, modal: true, buttons: { "plot incident , save database": function () { //$(this).dialog("close"); if (checkifuploaded($('#idcr').val())) { $.post( 'insertcrimelocation.aspx', { lat: $('#latt').val(), long: $('#longt').val(), cirsid: $('#idcr').val() }, function (responsetext, textstatus) { //checkifexist plot(); $("#panel2").dialog("close"); $.ambiance({ message: "successfully plotted incident!", title: "success!", type: "success" }); }) .error(function () { $.ambiance({ message: "error on request", title: "error!", type: "error" }); }); } else { $.ambiance({ message: "the c.i.r.s id not yet uploaded", title: "error!", type: "error" }); } }, cancel: function () { $(this).dialog("close"); } } }); } my webservice code below returns expected returns true
<webmethod()> _ public function checkifexist(citenr string) boolean dim locs new crimemsapslocationdatacontext dim check = locs.offenses.where(function(offense) offense.cite_nr = citenr).first if not check nothing return true else return false end if end function what amazes me on second function namely plotnew() if return value true executes other way around instead of calling function trough page there wrong code?
i got work code below
function checkifuploaded(citenr) { $.ajax({ type: "post", url: "locationsdb.asmx/checkifexist", data: '{"citenr": "' + citenr + '"}', contenttype: "application/json; charset=utf-8", datatype: "json", success: function (response) { if (response.d) { squeezed function here make work , info } else { return false; } //setinfo(); }, failure: function (response) { alert(response.d); } }); }
you can use promise object handle asynchronous processing. http://api.jquery.com/jquery.ajax/
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