我试图让下面的工作没有运气
我有一个"会话"文本框一个"cost_per_session"和"total_cost">
我调用函数"calculate(("来计算总成本并将其放在"total_cost"中
我想要
如果"会话"为空
或者如果total_cost超过 50
要隐藏的保存按钮
有人可以帮忙吗?
<form method="post" action="#">
<section>
<label>Sessions: </label>
<input type="text" name="sessions" id="sessions" autocomplete="off" placeholder="XX"
oninput="
calculate();
if ($('#sessions').val() == '' || $('#total_cost').val() > 50)
{
$('#save_button_box').hide();
}
else
{
$('#save_button_box').show();
};
" >
</label>
</section>
<section>
<label>Cost Per Session</label>
<input type="text" name="cost_per_session" id="cost_per_session" readonly="" value="5">
</label>
</section>
<section>
<label class="label">Total Cost</label>
<input type="text" name="total_cost" id="total_cost" readonly="">
</label>
</section>
<div id="save_button_box" style="display:none;">
<button type="submit" class="button">Save</button>
</div>
</form>
function calculate() {
var var_sessions = document.getElementById('sessions').value;
var var_cost_per_session = document.getElementById('cost_per_session').value;
var result_total_cost = var_sessions * var_cost_per_session;
total_cost.value = result_total_cost;
}
我认为这就是你想要的。这是你的代码,我只是将 if 从 html 移动到 javascript 并用result_total_cost更改了total_cost
function calculate() {
var var_sessions = document.getElementById('sessions').value;
var var_cost_per_session = document.getElementById('cost_per_session').value;
var result_total_cost = var_sessions * var_cost_per_session;
var total_cost = document.getElementById('total_cost').value;
console.log(var_sessions);
console.log(total_cost);
if (var_sessions == '' || result_total_cost > 50)
{
$('#save_button_box button').hide();
}
else
{
$('#save_button_box button').show();
}
document.getElementById('total_cost').value = result_total_cost;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form method="post" action="#">
<section>
<label>Sessions: </label>
<input type="text" name="sessions" id="sessions" autocomplete="off" placeholder="XX" oninput="calculate();" >
</label>
</section>
<section>
<label>Cost Per Session</label>
<input type="text" name="cost_per_session" id="cost_per_session" readonly="" value="5">
</label>
</section>
<section>
<label class="label">Total Cost</label>
<input type="text" name="total_cost" id="total_cost" readonly="">
</label>
</section>
<div id="save_button_box" style="">
<button type="submit" class="button">Save</button>
</div>
</form>
你做的一切都很好像我一样安排好它们...
function calculate() {
var var_sessions = document.getElementById('sessions').value;
var var_cost_per_session = document.getElementById('cost_per_session').value;
var result_total_cost = var_sessions * var_cost_per_session;
total_cost.value = result_total_cost;
if ($('#sessions').val() == '' || $('#total_cost').val() > 50)
{
$('#save_button_box').hide();
}
else
{
$('#save_button_box').show();
};
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js" ></script>
<form method="post" action="#">
<section>
<label>Sessions: </label>
<input type="text" name="sessions" id="sessions" autocomplete="off" placeholder="XX" oninput="calculate();" >
</label>
</section>
<section>
<label>Cost Per Session</label>
<input type="text" name="cost_per_session" id="cost_per_session" readonly="" value="5">
</label>
</section>
<section>
<label class="label">Total Cost</label>
<input type="text" name="total_cost" id="total_cost" readonly="">
</label>
</section>
<div id="save_button_box" style="display:none;">
<button type="submit" class="button">Save</button>
</div>
</form>