在jquery中自动隐藏提交按钮

Question

 I want to hide my submit button without mouse click & show message.

当主要余额少于输入提取金额时。然后自动隐藏提交按钮并显示insufficient balance的消息

网页代码：

  <div id="message"></div>
   <div class="form-group">
      <center><button type="submit" id="withdraw_button" class="btn btn-info btn-rounded w-md waves-effect waves-light m-b-5">Withdraw</button></center>
                    </div>

Jquery Code：

<script type="text/javascript">
$(document).ready(function(){
var main_balance  = $("#main_balance").val();
$('#withdraw_amount').blur(function(){
var input_amount = $(this).val();
if (input_amount.length != 0) {
  if (input_amount > main_balance) {
      // When insinuation balance then hide button automatic
       $('#withdraw_button').hidden();
       // Show message 
       // how can i see it
    }    
   }
  });
 });

如何解决这个问题。 目前我使用Laravel框架。

Answer 1

我想你在寻找那个。
我基本上将您的主要余额设置为 20，如果输入大于 20，则提交按钮将隐藏。您也可以根据您的要求在 if 或 else 条件中添加消息。

$(document).ready(function(){
var main_balance  = 20;
$('#withdraw_amount').keyup(function(){
var input_amount = $(this).val();
if (input_amount.length != 0) {
  if (input_amount > main_balance) {
      // When insinuation balance then hide button automatic
       $('#withdraw_button').hide();
       // Show message 
        $('#message').html('insufficient balance');
       // how can i see it
    } else {
     $('#withdraw_button').show();
     $('#message').html('');
     }
   }
  });
 });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="message"></div>
   <div class="form-group">
   <input type="number" name="withdraw_amount" id="withdraw_amount">
      <center><button type="submit" id="withdraw_button" class="btn btn-info btn-rounded w-md waves-effect waves-light m-b-5">Withdraw</button></center>
                    </div>

Answer 2

尝试在函数中添加else：

if (input_amount > main_balance) {
   //When insinuation balance then hide button automatic
   $('#withdraw_button').hide();
   alert('Insufficient balance!');
}else{
    $('#withdraw_button').show();
}   

Answer 3

请更新您的 jquery

<script type="text/javascript">
$(document).ready(function(){
var main_balance  = $("#main_balance").val();
$('#withdraw_amount').blur(function(){
var input_amount = $(this).val();
if (input_amount.length != 0) {
  if (input_amount > main_balance) {
      // When insinuation balance then hide button automatic
       $('#withdraw_button').hide();
       // Show message 
       // how can i see it
    } else {
        $('#withdraw_button').show();
    }
   }
  });
    $('body').click(function(){
      $('#withdraw_button').hide();
    });
 });

Answer 4

绑定多个事件以避免单击外部触发事件。

$("#withdraw_amount").bind("keyup change", function(e)

这是您修改后的代码

$(document).ready(function(){
    var main_balance  = Number($("#main_balance").val());
    //$('#withdraw_amount').keyup(function(){
    $("#withdraw_amount").bind("keyup change", function(e) {
        var input_amount = Number($(this).val());
        if (input_amount.length != 0) {
            if (input_amount > main_balance) {
              // When insinuation balance then hide button automatic
               $('#withdraw_button').hide();
               $('#message').text("insufficient balance");
               // Show message 
               // how can i see it
           } else {
                $('#message').text("");
                $('#withdraw_button').show();
           }   
        }
    });
});

演示