Javascript jquery - 从数组对象中获取值
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jquery - get value from array object
提问by codenoob
I have an array of object that look like this
我有一个看起来像这样的对象数组
var result = [{"id":"1","price":"20.46"},{"id":"2","price":"40.00"}]
right now I can access it by
现在我可以通过
result[0].price
but what I am trying to do is loop through the array of object, and compare the id to a user inputed id and return the matching value. So the index should be irrelevant
但我想要做的是遍历对象数组，并将 id 与用户输入的 id 进行比较并返回匹配的值。所以索引应该是无关紧要的
I tried to loop through the array of object, but I probably made some grammar mistake and got nothing back.
我试图遍历对象数组，但我可能犯了一些语法错误并且一无所获。
var userinputid = 1;
result.forEach(function(){
if(userinputid == result.id){
alert(result.price);
});
How to solve this.
如何解决这个问题。
回答by Nenad Vracar
Instead of result.idyou should use currentElementInLoop.id
而不是result.id你应该使用currentElementInLoop.id
var result = [{"id":"1","price":"20.46"},{"id":"2","price":"40.00"}]
var userinputid = 1;
result.forEach(function(e) {
if (userinputid == e.id) alert(e.price);
});回答by Sean Wang
You are missing a end brace. And you need to have the function use the element value parameter or the index parameter. Try
你缺少一个结束括号。并且您需要让函数使用元素值参数或索引参数。尝试
result.forEach(function (elementVal) {
if (userinputid === elementVal.id){
alert(elementVal.price);
}
});
回答by jacqbus
You forgot about index:
你忘记了索引：
var result = [{"id":"1","price":"20.46"},{"id":"2","price":"40.00"}]
var userinputid = 1;
result.forEach(function(e, index){
if(userinputid == result[index].id){
alert(result[index].price);
};
});