Question

我上传了我的JavaScript代码：

$(document).ready(function(){
    $("#remain_credit").click("calculate_remain_credit");
});

function calculate_remain_credit() {
    var hour_start = document.getElementById(parseInt('credit_taken'));
    var hour_end = document.getElementById(parseInt('course_credit'));
    var hour_total = credit_taken - course_credit;

    document.getElementById('remain_credit').innerHTML = remain_credit;
}

我也在这里上传我的Laravel表格：

<div class="form-group">
    {{Form::label('credit',' Remain Credit ')}}
    {!! Form::number('remain_credit', null, array('id'=>'remain_credit','placeholder' => ' Remain Credit  ','class' => 'form-control')) !!}
</div>

如何解决此问题？

Answer 1

您应该在代码中修复三个问题：

点击事件附件应如下所示：

$("#remain_credit").click(calculate_remain_credit);

删除引号：

$("#remain_credit").click("calculate_remain_credit");
__________________________^_______________________^

如果要更新输入值，则需要将innerHTML替换为value，应该是：
```
document.getElementById('remain_credit').value = remain_credit;
```

获得值后，您需要解析：

var hour_start = document.getElementById(parseInt('credit_taken'));
var hour_end   = document.getElementById(parseInt('course_credit'));

应该是：

var hour_start = parseInt( document.getElementById('credit_taken').value );
var hour_end   = parseInt( document.getElementById('course_credit').value );

完整更新的代码将是：

$(document).ready(function(){
    $("#remain_credit").click(calculate_remain_credit);
});

function calculate_remain_credit() {
    var hour_start = parseInt( document.getElementById('credit_taken').value );
    var hour_end   = parseInt( document.getElementById('course_credit').value );
    var hour_total = credit_taken - course_credit;

    document.getElementById('remain_credit').value = remain_credit;
}

Answer 2

parseInt应该是第一个，然后是document.getElementById：

$("#remain_credit").click(calculate_remain_credit);

function calculate_remain_credit() {
    // here use parseInt before getElementById
    var hour_start = parseInt(document.getElementById('credit_taken').value);
    var hour_end = parseInt(document.getElementById('course_credit').value);
    var hour_total = credit_taken - course_credit;

    document.getElementById('remain_credit').value = hour_total;
}

Laravel中的表格价值不归还

2 个答案: