如何在jquery或javascript中同步调用 [英] How to synchronise call in jquery or javascript

问题描述

能否请您告诉我如何在jquery或java脚本中调用syncize方法. 实际的问题是我在click button上调用了一个函数，并获得了一些值.虽然在函数调用下方，并且一段时间后我得到的是未定义的值，但我会得到值. 我将用我的例子来解释. 1)我需要在单击del按钮上获取CASENAME值.我正在从数据库中获取值.在获取此deleteFolder函数调用的同时，我将获得未定义的值. 然后在我将在这里获得实际价值后alert("CASENAME" + CASENAME);我认为我需要像在Java中一样同步此方法.

can you please tell me how to call synchronise method in jquery or java script. Actually problem is that I call one function on click button.And get some value .While getting below function call and i am getting undefined value after some time i will get value. I will explain with my example. 1)I need to get CASENAME value on click del button.I am getting the value from data base .While getting this deleteFolder function call .There i will get value undefined. then after i will get real value here alert("CASENAME"+CASENAME);I think i need to synchronise this method as we do in java.?

$(document).on('click', '.del', function(event) {

  ROW_ID = $(this).closest(".caseRowClick").attr("id");
  //getCaseNameValue();
  db.transaction(function (tx) {
            var caseName_h = $('.caseName_h').val();
            $yoursql = 'SELECT CaseName FROM CaseTable WHERE id ='+ ROW_ID;
            tx.executeSql($yoursql, [], function (tx, results) {
                CASENAME=results.rows.item(0).CaseName;
               alert("CASENAME"+CASENAME);
            });
});
  deleteData();
  deleteFolder();
  $(".ctrl").toggleClass("togg");
  event.stopPropagation();
});

function deleteFolder(){

     alert(CASENAME);
      window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fs) {
        console.log("Root ================********************* " + fs.root.fullPath);

        TEXTFILE_PATH=fs.root.fullPath;
        fs.root.getDirectory(CASENAME, {create: true, exclusive: false},
          function(dirEntry) {
            dirEntry.removeRecursively(successfullyDelete, faildelete)
          });

      });

    }

推荐答案

您应该在...附近传递该变量( CASENAME )

You should be passing that variable (CASENAME) around...

或变量应在两个函数的范围内.

or the variable should be in the scope of both the functions.

尝试一下:

$(document).on('click', '.del', function (event) {

    var ROW_ID = $(this).closest(".caseRowClick").attr("id");
    var CASENAME;
    //getCaseNameValue();
    db.transaction(function (tx) {
        var caseName_h = $('.caseName_h').val();
        $yoursql = 'SELECT CaseName FROM CaseTable WHERE id =' + ROW_ID;
        tx.executeSql($yoursql, [], function (tx, results) {
            CASENAME = results.rows.item(0).CaseName;
            alert("CASENAME" + CASENAME);
        });
    });
    deleteData();
    deleteFolder(CASENAME);
    $(".ctrl").toggleClass("togg");
    event.stopPropagation();
});

function deleteFolder(CASENAME) {

    alert(CASENAME);
    window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fs) {
        console.log("Root ================********************* " + fs.root.fullPath);

        TEXTFILE_PATH = fs.root.fullPath;
        fs.root.getDirectory(CASENAME, {
                create: true,
                exclusive: false
            },
            function (dirEntry) {
                dirEntry.removeRecursively(successfullyDelete, faildelete)
            });

    });

}

这篇关于如何在jquery或javascript中同步调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！