Question

我想计算总数=数量*价格，并在更改数量或价格时更新总数。 image

我的HTML代码是：

library(data.table)
library(plyr)
new <- function(df) {
upper=0
ds <- split(df, f = df$main) #this col have rows on which I split the df
s <- sapply(ds, function(x) sort(x$mean)) # this is the col with mean values needed for t.test()
n <- mapply(FUN = function(x) {sort(x)}, x = s)
l <- mapply(FUN = function(x) {length(x)}, x = s)
for (j in l) {
  for(i in 1:(j-1)) {
    for (k in n) {
      upper <- c(upper, k[i])
      lower <- k[-c(upper:i)]
      t <- t.test(upper, lower, var.equal = TRUE, na.rm=TRUE)
      print(t[['p.value']])
     }
    }  
  }
}

Error in t.test.default(upper, lower, var.equal = TRUE, na.rm = TRUE) : 
not enough 'y' observations
In addition: There were 50 or more warnings (use warnings() to see the 
first 50)

 > warnings()
 Warning messages:
 1: In -upper:-i : numerical expression has 2 elements: only the first used

我的代码：

<form [formGroup]="editform" (ngSubmit)="edisale()" class="col s12" materialize>
  <div class="form-group">
    <table align="center" class="table table-bordered table-hover">
      <thead>
        <tr style="color:black;">
          <th>Price</th>
          <th>Quantity</th>
          <th>Notes</th>
          <th>Subtotal</th>
         </tr>
      </thead>
      <tbody>
        <tr  formArrayName="products" class="group" style="cursor: pointer" *ngFor="let sale of editform.get('products').value; let i = index" [formGroupName]="i">
          <td>
            <input class="form-control" id="p_unit_price " type="number" class="validate" [value]="sale.p_unit_price" ng-change="tot()">
          </td>
          <td>
            <input class="form-control" type="text" formControlName="p_quantity" id="p_quantity" name="p_quantity" [value]="sale.p_quantity" ng-change="tot()" >
          </td>
          <td>
            <div class="input-field col s2">
              <input  class="form-control" formControlName="p_description" id="p_description" type="text" class="validate" [value]="sale.p_description">
            </div>
          </td>
          <td>
            <input  class="form-control" type="text" formControlName="p_subtotal" id="p_subtotal" name="p_subtotal" [value]="(sale.p_subtotal)">
          </td>
          <td>

          </td>
        </tr>
      </tbody>
    </table>
  </div>
  <br>
  <br>
  <div class="row">
    <div class="input-field col s2" style="float: right;">
      Total: {{Total}} ALL
      <input  class="form-control" formControlName="total" id="total" type="text" class="validate" [value]="totale">
    </div>
    <div class="form-control" class="input-field col s2" style="float: right;">
      Amount Paid:
      <input class="form-control"  formControlName="amount_paid" id="amount_paid" type="text" class="validate">
    </div>
    <div class="input-field col s2" style="float: right;">
      Subtotal:
      <input formControlName="subtotal" id="subtotal" type="text" class="validate" [value]="Total">
    </div>
  </div>
  </form>

当我更改数量或价格时，总共没有任何变化。你能告诉我任何想法或我的代码中有什么问题吗？谢谢

Answer 1

添加（更改）=＆＃34; somefunction（）＆＃34;并使用[（ngModel）] =＆＃34; var1＆＃34;创建双向绑定在你的输入

export class ComponentName {

var1;var2; var3;
  constructor(
  ) { }
functionName(){
// when you change your input this method is called and then manipulate your variable.
}

}

如何计算总数并更新total = quantity *在打字稿中订阅

1 个答案: