如何基于事件在json数组中添加和删除对象(cursor.observeChanges)

问题描述

我使用cursor.observechange，这样，无论何时添加记录，它都会在UI上通知.记录类型: {"ref":"100"，"status":进行中"} 我有一个空数组

Iam using cursor.observechange such that when ever a record is added,it notifies on UI.recordtype: {"ref":"100","status":"inprogress"}I have an empty array

var arr=[];

每当我需要检查状态是否正在进行中并且ref在arr []中的任何对象中都不存在时.如果是这样，则需要将其推入arr

When ever I need to check if status is inprogress and that ref doesnt exist in any object in arr[]..If so then I need to push that to arr

arr.push(obj);

如果状态已完成，并且ref已经存在于arr []中，那么我需要从arr []中删除它下面是我尝试过的

If that status is complete and if ref already exists in arr[],then I need to delete that from arr[]Below is that i tried

var arr = [];
function addObject(obj){
       if(!arr.some(function(el){return (el.ref === obj.ref)}))
            {
                arr.push(obj);
            }
         else if{
                arr.slice(el);
                }

    }
    var cursor = TransactionDetails.find({ });
    cursor.observeChanges({
            added: function(id, object) {
              if (object.status == "incomplete") {
                    addObject(object);
                    Notification.error("added");
                }
                    else if(object.status == "complete" {

                    addObject(object);
                    Notification.error("modified");

                }
       }

        });

但是这不起作用.我们如何根据这种情况添加和删除.有任何帮助.谢谢！

But this is not working.How can we add and delete based on that conditions.Any help.Thanks!

推荐答案

您可以使用函数从数组 arr 中删除对象.

You could use a function for removing an object from the array arr.

它使用 Array#findIndex

function removeObject(obj) {
    var index = arr.findIndex(o => o.ref === obj.ref);

    if (index !== -1) {
        arr.splice(index, 1);
    }
}

或带有 Array#some

function removeObject(obj) {
    function getIndex(el, i) {
        if (el.ref === obj.ref) {
            index = i;
            return true;
        }
    }

    var index;

    if (arr.some(getIndex)) {
        arr.splice(index, 1);
    }
}

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