使用jQuery获取先前的元素值 [英] get the previous element value with jquery

问题描述

我有一个wordpress页面，上面用ajax显示产品添加到购物车中.我想在单击按钮时获取name = quantity的input的值.我想用jquery prev()函数做到这一点，因为还有许多其他输入都具有相同的属性.那我该怎么办呢?我有

I have a wordpress page on which products are shown with ajax add to cart action. I want to get the value of input with name=quantity when button is clicked. I want to do this with jquery prev() function as there are many other inputs with same attributes. So how can i do that? I have

jQuery(document).ready(function(e){
     e(document).on("click",".add_to_cart_button",
          function(){
          var t=e(this);   
})})



<form action="/shop/?add-to-cart=1732" class="cart" method="post" enctype="multipart/form-data">
    <div class="quantity buttons_added">
       <input type="button" value="-" class="minus">
       <input type="number" step="1" name="quantity" value="1" title="Qty" class="input-text qty text">
       <input type="button" value="+" class="plus">
    </div>
    <button type="submit" data-product_id="1732" data-product_sku="menu-aug-02" data-quantity="1" class="add_to_cart_button button product_type_simple">Add to cart</button></form>

推荐答案

尝试一下

$('input[type=submit]').click(function() {
    ...
    ...

    var prevInput = $(this).prev().children('input[name=quantity]');    // This is what you need


    // Try with this 
    var requiredInput;
    $(this).prev().children().each(function() {
        if($(this).attr('name') != null)
        {
            requiredInput = $(this);
        }
    });

    ...
    ...
});

API
prev()
children()

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