jQuery中自动隐藏提交按钮

Question

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

当主结余减去然后输入的提款金额。 然后自动隐藏提交按钮并显示insufficient balance消息

HTML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代码：

<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

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 2

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 3

我认为您正在寻找。
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。 您也可以根据自己的要求在条件中添加消息。

 $(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 mb-5">Withdraw</button></center> </div> 

Answer 4

绑定多个事件，以避免在外部触发事件。

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

这是您修改的代码

$(document).ready(function(){
    var main_balance  = Number($("#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