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In this scenario, a JavaScript widget's beforecreate function needs to prevent item creation based on an Ajax response. However, jQuery's default Ajax requests are asynchronous.
To make the Ajax request synchronous, specify the async option to be false in the jQuery $.ajax function. This ensures that the callback is executed before the mother function proceeds.
beforecreate: function (node, targetNode, type, to) { jQuery.ajax({ url: 'http://example.com/catalog/create/' + targetNode.id + '?name=' + encode(to.inp[0].value), success: function (result) { if (result.isOk == false) alert(result.message); }, async: false }); }
By setting async to false, jQuery performs a synchronous Ajax request, meaning the callback is called immediately after the server responds. This allows the callback to set the necessary data before the beforecreate function continues, providing the desired functionality of preventing item creation based on the Ajax response.
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