jQuery的,检查是否存在数组或者不是一个价值 [英] Jquery, checking if a value exists in array or not
问题描述
我相信这个问题将是相当容易的谁与Java脚本/ jQuery的周围起的人。
VAR ARR =新的Array();$ .MAP(ARR,函数(){
如果(this.id ==的productID){
this.price = productSku,则;
}其他{
arr.push({ID列:ProductId,价格:productSku,则})
}
}
我猜code以上解释什么,我想非常简单的方法。我可以想象这$ .MAP将这样的工作但遗憾的是我不能这样得到的结果。
什么是最简单,最优雅的方式来做到这一点?我才真正通过所有数组只找到,如果键的值是有或没有?
请问jQuery有类似使用isset($数组['关键'])
?
修改
我试图用inArray但它一直添加对象数组,即使有一个匹配。
如果($ .inArray(的productID,ARR)-1个){
变种数= $ .inArray(的productID,ARR);
OrderInfo的[数字]。价格= parseFloat(productSku,则);
}其他{
orderInfo.push({ID列:ProductId,价格:parseFloat(productSku,则)});
}
如果您想用做 .MAP()
或只是想知道它是如何运作的,你能做到这一点是这样的:
VAR添加= FALSE;
$ .MAP(ARR,功能(elementOfArray,indexInArray){
如果(elementOfArray.id ==的productID){
elementOfArray.price = productSku,则;
添加= TRUE;
}
}
如果(!添加){
arr.push({ID列:ProductId,价格:productSku,则})
}
功能分别处理每个元素。在 .inArray()
其他答案建议很可能是做更有效的方式。
I believe this question will be fairly easy for the ones who played around with java script / jquery.
var arr = new Array();
$.map(arr, function() {
if (this.id == productID) {
this.price = productPrice;
}else {
arr.push({id: productID, price: productPrice})
}
}
I guess the code above explains what I want in really simple way. I would imagine this $.map would work like this but unfortunately I couldn't get results with this.
What is the most simple and elegant way to do this? Do I truly go through all array just to find if a key's value is there or not?
Does Jquery has something like isset($array['key'])
?
EDIT
I tried to use inArray but it keeps adding object to array even if there is a match.
if ( $.inArray(productID, arr) > -1) {
var number = $.inArray(productID, arr);
orderInfo[number].price = parseFloat(productPrice);
}else {
orderInfo.push({id:productID, price:parseFloat(productPrice)});
}
If you want to do it using .map()
or just want to know how it works you can do it like this:
var added=false;
$.map(arr, function(elementOfArray, indexInArray) {
if (elementOfArray.id == productID) {
elementOfArray.price = productPrice;
added = true;
}
}
if (!added) {
arr.push({id: productID, price: productPrice})
}
The function handles each element separately. The .inArray()
proposed in other answers is probably the more efficient way to do it.
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