我有三个文本字段,每个字段都有用于增加或减少值的按钮,最终文本字段将显示每个字段值的计算。
一切都运行良好,但问题是。每当我物理地向这三个输入字段添加一个值时,它就会获取该值并显示它。 第一个专业 -> 但每当我尝试通过按钮添加值时,单击它不会显示值。
第二个亲->默认情况下,我会为每个文本字段添加值,它们应该将最终计算值显示到我的第四个文本字段中,该文本字段位于所有文本字段的右上方 但在我触摸任何文本字段之前,它不会在同一文本字段上显示计算值。
请帮助我,这确实是需要的。这是我的源代码。
window.sum = () => document.getElementById('get_my_value').value =Array.from(document.querySelectorAll('#txt1,#txt2,#txt3')).map(e => parseInt(e.value) || 0).reduce((a, b) => a + b, 0)
function increaseValueFirst() {
// body...
var value = parseInt(document.getElementById('txt1').value, 10);
value = isNaN(value) ? 0 : value;
value++;
document.getElementById('txt1').value = value;
}
function decreaseValueFirst() {
// body...
var value = parseInt(document.getElementById('txt1').value, 10);
value = isNaN(value) ? 0 : value;
value < 1 ? value = 1 : '';
value--;
document.getElementById('txt1').value = value;
}
function increaseValueSec() {
// body...
var value = parseInt(document.getElementById('txt2').value, 10);
value = isNaN(value) ? 0 : value;
value++;
document.getElementById('txt2').value = value;
}
function decreaseValueSec() {
// body...
var value = parseInt(document.getElementById('txt2').value, 10);
value = isNaN(value) ? 0 : value;
value < 1 ? value = 1 : '';
value--;
document.getElementById('txt2').value = value;
}
function increaseValueThird() {
// body...
var value = parseInt(document.getElementById('txt3').value, 10);
value = isNaN(value) ? 0 : value;
value++;
document.getElementById('txt3').value = value;
}
function decreaseValueThird() {
// body...
var value = parseInt(document.getElementById('txt3').value, 10);
value = isNaN(value) ? 0 : value;
value < 1 ? value = 1 : '';
value--;
document.getElementById('txt3').value = value;
}
<?php
$firstvalue = 1;
$secondvalue = 1;
?>
<!DOCTYPE html>
<html>
<head>
<title></title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div class="row">
<div class="form-group">
<div class="col-sm-1">
<label>Night</label>
<input type="text" name="quant[2]" class="form-control input-number" value="0" min="0" max="100" id="get_my_value" onchange="dateRangeSelector()" readonly>
</div>
</div>
</div>
<input type="button" value="-" id="subsfirst" class="subsfirst" onclick="decreaseValueFirst()">
<input type="text" id="txt1" onkeyup="sum()" />
<input type="button" value="+" id="addfirst" class="addfirst" onclick="increaseValueFirst()">
<input type="button" value="-" id="subssec" class="subssec" onclick="decreaseValueSec()">
<input type="text" id="txt2" onkeyup="sum()" style="margin-right:10px;" />
<input type="button" value="+" id="addsec" class="addsec" onclick="increaseValueSec()">
<input type="button" value="-" id="substhird" class="substhird" onclick="decreaseValueThird()">
<input type="text" id="txt3" onkeyup="sum()" />
<input type="button" value="+" id="addthird" class="addthird" onclick="increaseValueThird()">
</div>
</div>
</div>
</body>
</html>
现在您可以看到单击按钮不起作用,但直到您实际添加值之前它才会起作用。
第二个是右上角,有一个最终计算文本字段,它显示总计值,默认情况下也不会显示值,直到您添加或单击每个文本字段中的任何一个。
提前致谢。
最佳答案
这些按钮不起作用,因为它们不会触发 onkeyup
方法,该方法用于计算 sum
并通过调用 sum 显示总和()
方法。因此,您可以在单击按钮时调用增加/减少函数和 sum()
方法(从而添加/减去并重新计算和显示总和):
onclick="decreaseValueFirst(); sum();"
您可以将其应用于每个按钮以获得以下工作结果:
window.sum = () =>
document.getElementById('get_my_value').value =
Array.from(
document.querySelectorAll('#txt1,#txt2,#txt3')
).map(e => parseInt(e.value) || 0)
.reduce((a, b) => a + b, 0)
function increaseValueFirst() {
// body...
var value = parseInt(document.getElementById('txt1').value, 10);
value = isNaN(value) ? 0 : value;
value++;
document.getElementById('txt1').value = value;
}
function decreaseValueFirst() {
// body...
var value = parseInt(document.getElementById('txt1').value, 10);
value = isNaN(value) ? 0 : value;
value < 1 ? value = 1 : '';
value--;
document.getElementById('txt1').value = value;
}
function increaseValueSec() {
// body...
var value = parseInt(document.getElementById('txt2').value, 10);
value = isNaN(value) ? 0 : value;
value++;
document.getElementById('txt2').value = value;
}
function decreaseValueSec() {
// body...
var value = parseInt(document.getElementById('txt2').value, 10);
value = isNaN(value) ? 0 : value;
value < 1 ? value = 1 : '';
value--;
document.getElementById('txt2').value = value;
}
function increaseValueThird() {
// body...
var value = parseInt(document.getElementById('txt3').value, 10);
value = isNaN(value) ? 0 : value;
value++;
document.getElementById('txt3').value = value;
}
function decreaseValueThird() {
// body...
var value = parseInt(document.getElementById('txt3').value, 10);
value = isNaN(value) ? 0 : value;
value < 1 ? value = 1 : '';
value--;
document.getElementById('txt3').value = value;
}
<?php
$firstvalue = 1;
$secondvalue = 1;
?>
<!DOCTYPE html>
<html>
<head>
<title></title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<div class="row">
<div class="form-group">
<div class="col-sm-1">
<label>Night</label>
<input type="text" name="quant[2]" class="form-control input-number" value="0" min="0" max="100" id="get_my_value" onchange="dateRangeSelector()" readonly>
</div>
</div>
</div>
<input type="button" value="-" id="subsfirst" class="subsfirst" onclick="decreaseValueFirst(); sum();">
<input type="text" id="txt1" onkeyup="sum()" />
<input type="button" value="+" id="addfirst" class="addfirst" onclick="increaseValueFirst(); sum();">
<input type="button" value="-" id="subssec" class="subssec" onclick="decreaseValueSec(); sum();">
<input type="text" id="txt2" onkeyup="sum()" style="margin-right:10px;" />
<input type="button" value="+" id="addsec" class="addsec" onclick="increaseValueSec(); sum();">
<input type="button" value="-" id="substhird" class="substhird" onclick="decreaseValueThird(); sum();">
<input type="text" id="txt3" onkeyup="sum()" />
<input type="button" value="+" id="addthird" class="addthird" onclick="increaseValueThird(); sum();">
</div>
</div>
</div>
</body>
</html>
关于javascript - 文本字段不是通过单击按钮读取值,而是直到我将值物理添加到文本字段中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53388923/