【JS】实时监控页面，input框数值自动求和

迷南。 2021-12-03 06:53 254阅读 0赞

需求：

有一个页面需要将input框填入的各个费用自动相加，添加到“合计费用”里。

解决方案：

使用jquery的blur实践，每个费用的Input框检测到失去焦点时，将所有的input框数值相加求和，然后写入到“合计费用”框中

代码：

HTML代码如下所示

<div class="form-group">
                            <label class="col-xs-2 control-label">管理费</label>
                            <div class="input-group col-xs-8">
                                <input type="number" class="form-control bill-count" name="fee_gl" autocomplete="off">
                            </div>
                        </div>
    
                        
                        <div class="form-group">
                            <label class="col-xs-2 control-label">光纤费</label>
                            <div class="input-group col-xs-8">
                                <input type="number" step="0.01" class="form-control bill-count" name="fee_gx" autocomplete="off">
                            </div>
                        </div>
    
                        
                        <div class="form-group">
                            <label class="col-xs-2 control-label">税金</label>
                            <div class="input-group col-xs-8">
                                <input type="number" step="0.01" class="form-control bill-count" name="fee_sj" autocomplete="off">
                            </div>
                        </div>
    
                        
                        <div class="form-group">
                            <label class="col-xs-2 control-label">社保</label>
                            <div class="input-group col-xs-8">
                                <input type="number" step="0.01" class="form-control bill-count" name="fee_sb" autocomplete="off">
                            </div>
                        </div>
    
                        
                        <div class="form-group">
                            <label class="col-xs-2 control-label">公积金</label>
                            <div class="input-group col-xs-8">
                                <input type="number" step="0.01" class="form-control bill-count" name="fee_gjj" autocomplete="off">
                            </div>
                        </div>
    
                        
                        <div class="form-group">
                            <label class="col-xs-2 control-label">残障金</label>
                            <div class="input-group col-xs-8">
                                <input type="number" step="0.01" class="form-control bill-count" name="fee_czj" autocomplete="off">
                            </div>
                        </div>
    
                        
                        <div class="form-group">
                            <label class="col-xs-2 control-label">费用合计</label>
                            <div class="input-group col-xs-8">
                                <input type="number" disabled id="fee-total" class="form-control" name="fee_total" value="0" autocomplete="off">
                            </div>
                        </div>

JS代码如下所示

//    收款项失去焦点事件
        $('.bill-count').blur(function(){
            var _total = 0;
            $('.bill-count').each(function(){
                _total += Number(this.value);
            })
            $('#fee-total').val(_total);
            console.log(_total);
        })

运行结果：

如图所示，每个input框失去焦点后，会自动将所有input框的值相加填入到“费用合计”框中，达成预期效果。

![1284156-20190624180019853-1823900321.png][]

转载于:https://www.cnblogs.com/BearLee/p/11078565.html

[1284156-20190624180019853-1823900321.png]: /images/20211203/93fa5b7d64f14c44a6bbcaae798eb9bc.png