单击属于表单的另一个按钮时如何禁用提交表单

Question

我编写了一个购物车页面并使用了两个按钮来减少和增加数量，我使用 javascript 使其正常工作。 HTML 一半的代码在这里，

<form action="payment.php" method="post">
<div class="qty__amount">
    <button class="qty__button" id="minus1"><i class="uil uil-minus-square-full"></i></button>
    <input autocomplete="off" class="qtyamount1 ro_form-qty" type="text" id="qtyamount1" name="qty1" value="0" readonly>
    <button class="qty__button" id="plus1"><i class="uil uil-plus-square"></i></button>
</div>

<div class="button">
    <button class="checkout__button" type="submit">Checkout</button>
</div>
</form>

Javascript代码在这里，

document.getElementById("minus1").onclick = function() {minusButton("qtyamount1","itemPrice1","eachItemTotal1")};                       
document.getElementById("plus1").onclick = function() {plusButton("qtyamount1","itemPrice1","eachItemTotal1")};  

function minusButton(quantityID,itemPriceId,eachItemTotalpriceID){
    priceDecrease(itemPriceId,quantityID);
    quantityDecrease(quantityID);
    eachItemPriceDecrease(eachItemTotalpriceID,itemPriceId);
}
function plusButton(quantityID,itemPriceId,eachItemTotalpriceID){
    priceIncrease(itemPriceId);
    quantityIncrease(quantityID);
    eachItemPriceIncrease(eachItemTotalpriceID,itemPriceId);
}

function quantityDecrease(item){ // quantityDecrease
    
    let quantity = 0;
    quantity = parseInt(document.getElementById(item).value)-1;
    if(quantity<0){}
    else{
    document.getElementById(item).value = quantity.toString();
    }
}

function quantityIncrease(item){ //quantityIncrease
    
    let quantity = 0;
    quantity = parseInt(document.getElementById(item).value)+1;
    console.log(quantity);
    document.getElementById(item).value = quantity.toString();
}

数量显示在只读输入标签上，因为这样我就可以使用 PHP 获取值并将它们显示在另一页上。所以在该页面上，我实现了显示该数量值的代码。

PHP 代码在这里（来自payment.php），

<div class="details">
   <p class="pname">Product Name</p>
   <p class="pvar">Variation</p>
   <p class="pqty">.00 &Cross; <?php echo $_POST["qty1"] ?></p>
</div>

因此，在我将此 PHP 代码添加到 payment.php 文件后，增加和减少按钮不起作用。但它以前有效。所以我想知道如何解决这个自动提交问题？

Answer 1

解决了:) 我在按钮上添加了 type="button"。

Answer 2

您只需将 onsubmit HTML 属性添加到表单的 HTML 并调用 event.preventDefault 函数。像这样：

<form onsubmit="event.preventDefault()" action="payment.php" method="post">
    <div class="qty__amount">
      <button class="qty__button" id="minus1" type="button"><i class="uil uil-minus-square-full"></i></button>
      <input autocomplete="off" class="qtyamount1 ro_form-qty" type="text" id="qtyamount1" name="qty1" value="0" readonly>
      <button class="qty__button" id="plus1" type="button"><i class="uil uil-plus-square"></i></button>
    </div>

    <div class="button">
      <button class="checkout__button" type="submit">Checkout</button>
    </div>
</form>

单击属于表单的另一个按钮时如何禁用提交表单

How to disable submit the form when click a another button that belongs to the form

html

javascript

php

forms

textinput