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使用JQuery更改动态添加的表单字段的输入ID(Change input id for dynamically added form fields using JQuery)

 我正在构建一个引用工具，我在使用JQuery单击Add more按钮时添加新的表单字段，并希望id也可以更改，以便我可以在我的计算中使用它，但id不会更改。 另外，我应该如何在计算中使用它，以便添加动态添加的表单字段。 非常感谢提前。 
 

 HTML： 
 

<div class="input_fields_wrap">
              <div class="empBlock3">
                <input type="text" value="Employee" class="employee" id="flex_2" onchange="updateTable2();" />
                <div class="slds-form-element__row" >
                  <div class="slds-form-element slds-size--1-of-4">
                    <div class="status1" name="status1"><h2>Single</h2></div>
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    <input type="number" id="flex_2_single_num" class="slds-input" min="0" max="1500" value="0" name="stepper1" style="width:50%;" onchange="updateTable2();" />
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    $ <input type="text" id="flex_2_single" name="amount1"  class="slds-input" style="width:50%;" onchange="updateTable2();" />
                  </div>
                </div>
                <div class="slds-form-element__row">
                  <div class="slds-form-element slds-size--1-of-4">
                    <div class="status2" name="status2"><h2>Family</h2></div>
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    <input type="number" id="flex_2_family_num" class="slds-input"  min="0" max="1500" value="0" name="stepper2" style="width:50%;" onchange="updateTable2();" />
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    $ <input type="text" id="flex_2_family" name="amount3" class="slds-input" style="width:50%;" onchange="updateTable2();" />
                  </div>
                </div>
                <div class="slds-form-element__row">
                  <div class="slds-form-element slds-size--1-of-4" name="ratio">
                    Ratio:
                    <select>
                      <option value="1:1">1:1</option>
                      <option value="1:2" selected="">1:2</option>
                      <option value="1:3">1:3</option>
                    </select>
                  </div>
                </div>
              </div>
            </div>

 

 JQuery的： 
 

function addMoreRows3() {
    empBlock3 ++;

// Adding extra form fields
   var recRow3 = '<div class="empBlock3'+empBlock3+'"> <br> <div class="empBlock3">\
   <input type="text" value="Employee" class="employee" id="flex_2" onchange="updateTable2();" />\
   <div class="slds-form-element__row" >\
     <div class="slds-form-element slds-size--1-of-4">\
       <div class="status1" name="status1"><h2>Single</h2></div>\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       <input type="number" id="flex_2_single_num" class="slds-input" min="0" max="1500" value="0" name="stepper1" style="width:50%;" onchange="updateTable2();" />\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       $ <input type="text" id="flex_2_single" name="amount1"  class="slds-input" style="width:50%;" onchange="updateTable2();" />\
     </div>\
   </div>\
   <div class="slds-form-element__row">\
     <div class="slds-form-element slds-size--1-of-4">\
       <div class="status2" name="status2"><h2>Family</h2></div>\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       <input type="number" id="flex_2_family_num" class="slds-input"  min="0" max="1500" value="0" name="stepper2" style="width:50%;" onchange="updateTable2();" />\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       $ <input type="text" id="flex_2_family" name="amount3" class="slds-input" style="width:50%;" onchange="updateTable2();" />\
     </div>\
   </div>\
   <div class="slds-form-element__row">\
     <div class="slds-form-element slds-size--1-of-4" name="ratio">\
       Ratio:\
       <select>\
         <option value="1:1">1:1</option>\
         <option value="1:2" selected="">1:2</option>\
         <option value="1:3">1:3</option>\
       </select>\
             </div>\
       </div><a href="javascript:void(0);" onclick="removeRow3('+empBlock3+');">Delete</a></div></div>';
   $('#addedRows3').append(recRow3);
    };

  function removeRow3(removeNum3) {
    $('.empBlock3'+removeNum3).remove();
  };

 

 报价工具的计算： 
 

    function updateTable2() { 
    // this updates the table as the values are being filled out
                // get the variables for the first Job Description (hsa_1)
                var flex1_Name = document.getElementById('flex_1').value;
                var flex1_Single_Num = document.getElementById('flex_1_single_num').value;
            var flex1_Single_Limit = document.getElementById('flex_1_single').value;
                var flex1_Family_Num = document.getElementById('flex_1_family_num').value;
            var flex1_Family_Limit = document.getElementById('flex_1_family').value;

                // get the variables for the second Job Description (hsa_2)
                var flex2_Name = document.getElementById('flex_2').value;
                var flex2_Single_Num = document.getElementById('flex_2_single_num').value;
            var flex2_Single_Limit = document.getElementById('flex_2_single').value;
                var flex2_Family_Num = document.getElementById('flex_2_family_num').value;
            var flex2_Family_Limit = document.getElementById('flex_2_family').value;

                var totalSingle = (flex1_Single_Limit * flex1_Single_Num)+(flex2_Single_Limit * flex2_Single_Num);
                var totalFamily = (flex1_Family_Limit * flex1_Family_Num)+(flex2_Family_Limit * flex2_Family_Num);
                var totalCost = totalSingle+totalFamily;

                var flexCostTMP=document.getElementById('iFlexfee');
                var flexCost=flexCostTMP.options[flexCostTMP.selectedIndex].value;


                // update the table values
                document.getElementById('iF1C0').innerHTML=parseInt((totalSingle)*.4);
                document.getElementById('iF1C1').innerHTML=parseInt((totalSingle)*.65);
                document.getElementById('iF1C2').innerHTML=parseInt((totalSingle)*.8);
                document.getElementById('iF1C3').innerHTML=parseInt((totalSingle)*1);

                document.getElementById('iF2C0').innerHTML=parseInt((totalFamily)*.4);
                document.getElementById('iF2C1').innerHTML=parseInt((totalFamily)*.65);
                document.getElementById('iF2C2').innerHTML=parseInt((totalFamily)*.8);
                document.getElementById('iF2C3').innerHTML=parseInt((totalFamily)*1);

                document.getElementById('iF5C0').innerHTML=parseInt((totalSingle)*.4*flexCost) + parseInt((totalFamily)*.4*flexCost);
                document.getElementById('iF5C1').innerHTML=parseInt((totalSingle)*.65*flexCost) + parseInt((totalFamily)*.65*flexCost);
                document.getElementById('iF5C2').innerHTML=parseInt((totalSingle)*.8*flexCost) + parseInt((totalFamily)*.8*flexCost);
                document.getElementById('iF5C3').innerHTML=parseInt((totalSingle)*1*flexCost) + parseInt((totalFamily)*1*flexCost);
                document.getElementById('iF6C0').innerHTML=parseInt((totalSingle)*.4*flexCost) + parseInt((totalFamily)*.4*flexCost) +parseInt(totalFamily*.4) + parseInt(totalSingle*.4);
                document.getElementById('iF6C1').innerHTML=parseInt((totalSingle)*.65*flexCost) + parseInt((totalFamily)*.65*flexCost) +parseInt(totalFamily*.65) + parseInt(totalSingle*.65);
                document.getElementById('iF6C2').innerHTML=parseInt((totalSingle)*.8*flexCost) + parseInt((totalFamily)*.8*flexCost) +parseInt(totalFamily*.8) + parseInt(totalSingle*.8);
                document.getElementById('iF6C3').innerHTML=parseInt((totalSingle)*1*flexCost) + parseInt((totalFamily)*1*flexCost) +parseInt(totalFamily*1) + parseInt(totalSingle*1);
            }


I am building a quote tool and I am adding new form field on the click of Add more button using JQuery, and want the id to change as well so that I can use it in my calculation, but the id doesn't change. Also, how should I use it in my calculation so it adds dynamically added form fields as well. Thanks a lot in advance.
 

HTML:
 

<div class="input_fields_wrap">
              <div class="empBlock3">
                <input type="text" value="Employee" class="employee" id="flex_2" onchange="updateTable2();" />
                <div class="slds-form-element__row" >
                  <div class="slds-form-element slds-size--1-of-4">
                    <div class="status1" name="status1"><h2>Single</h2></div>
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    <input type="number" id="flex_2_single_num" class="slds-input" min="0" max="1500" value="0" name="stepper1" style="width:50%;" onchange="updateTable2();" />
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    $ <input type="text" id="flex_2_single" name="amount1"  class="slds-input" style="width:50%;" onchange="updateTable2();" />
                  </div>
                </div>
                <div class="slds-form-element__row">
                  <div class="slds-form-element slds-size--1-of-4">
                    <div class="status2" name="status2"><h2>Family</h2></div>
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    <input type="number" id="flex_2_family_num" class="slds-input"  min="0" max="1500" value="0" name="stepper2" style="width:50%;" onchange="updateTable2();" />
                  </div>
                  <div class="slds-form-element slds-size--1-of-4">
                    $ <input type="text" id="flex_2_family" name="amount3" class="slds-input" style="width:50%;" onchange="updateTable2();" />
                  </div>
                </div>
                <div class="slds-form-element__row">
                  <div class="slds-form-element slds-size--1-of-4" name="ratio">
                    Ratio:
                    <select>
                      <option value="1:1">1:1</option>
                      <option value="1:2" selected="">1:2</option>
                      <option value="1:3">1:3</option>
                    </select>
                  </div>
                </div>
              </div>
            </div>

 

JQuery:
 

function addMoreRows3() {
    empBlock3 ++;

// Adding extra form fields
   var recRow3 = '<div class="empBlock3'+empBlock3+'"> <br> <div class="empBlock3">\
   <input type="text" value="Employee" class="employee" id="flex_2" onchange="updateTable2();" />\
   <div class="slds-form-element__row" >\
     <div class="slds-form-element slds-size--1-of-4">\
       <div class="status1" name="status1"><h2>Single</h2></div>\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       <input type="number" id="flex_2_single_num" class="slds-input" min="0" max="1500" value="0" name="stepper1" style="width:50%;" onchange="updateTable2();" />\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       $ <input type="text" id="flex_2_single" name="amount1"  class="slds-input" style="width:50%;" onchange="updateTable2();" />\
     </div>\
   </div>\
   <div class="slds-form-element__row">\
     <div class="slds-form-element slds-size--1-of-4">\
       <div class="status2" name="status2"><h2>Family</h2></div>\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       <input type="number" id="flex_2_family_num" class="slds-input"  min="0" max="1500" value="0" name="stepper2" style="width:50%;" onchange="updateTable2();" />\
     </div>\
     <div class="slds-form-element slds-size--1-of-4">\
       $ <input type="text" id="flex_2_family" name="amount3" class="slds-input" style="width:50%;" onchange="updateTable2();" />\
     </div>\
   </div>\
   <div class="slds-form-element__row">\
     <div class="slds-form-element slds-size--1-of-4" name="ratio">\
       Ratio:\
       <select>\
         <option value="1:1">1:1</option>\
         <option value="1:2" selected="">1:2</option>\
         <option value="1:3">1:3</option>\
       </select>\
             </div>\
       </div><a href="javascript:void(0);" onclick="removeRow3('+empBlock3+');">Delete</a></div></div>';
   $('#addedRows3').append(recRow3);
    };

  function removeRow3(removeNum3) {
    $('.empBlock3'+removeNum3).remove();
  };

 

Calculation for Quote tool:
 

    function updateTable2() { 
    // this updates the table as the values are being filled out
                // get the variables for the first Job Description (hsa_1)
                var flex1_Name = document.getElementById('flex_1').value;
                var flex1_Single_Num = document.getElementById('flex_1_single_num').value;
            var flex1_Single_Limit = document.getElementById('flex_1_single').value;
                var flex1_Family_Num = document.getElementById('flex_1_family_num').value;
            var flex1_Family_Limit = document.getElementById('flex_1_family').value;

                // get the variables for the second Job Description (hsa_2)
                var flex2_Name = document.getElementById('flex_2').value;
                var flex2_Single_Num = document.getElementById('flex_2_single_num').value;
            var flex2_Single_Limit = document.getElementById('flex_2_single').value;
                var flex2_Family_Num = document.getElementById('flex_2_family_num').value;
            var flex2_Family_Limit = document.getElementById('flex_2_family').value;

                var totalSingle = (flex1_Single_Limit * flex1_Single_Num)+(flex2_Single_Limit * flex2_Single_Num);
                var totalFamily = (flex1_Family_Limit * flex1_Family_Num)+(flex2_Family_Limit * flex2_Family_Num);
                var totalCost = totalSingle+totalFamily;

                var flexCostTMP=document.getElementById('iFlexfee');
                var flexCost=flexCostTMP.options[flexCostTMP.selectedIndex].value;


                // update the table values
                document.getElementById('iF1C0').innerHTML=parseInt((totalSingle)*.4);
                document.getElementById('iF1C1').innerHTML=parseInt((totalSingle)*.65);
                document.getElementById('iF1C2').innerHTML=parseInt((totalSingle)*.8);
                document.getElementById('iF1C3').innerHTML=parseInt((totalSingle)*1);

                document.getElementById('iF2C0').innerHTML=parseInt((totalFamily)*.4);
                document.getElementById('iF2C1').innerHTML=parseInt((totalFamily)*.65);
                document.getElementById('iF2C2').innerHTML=parseInt((totalFamily)*.8);
                document.getElementById('iF2C3').innerHTML=parseInt((totalFamily)*1);

                document.getElementById('iF5C0').innerHTML=parseInt((totalSingle)*.4*flexCost) + parseInt((totalFamily)*.4*flexCost);
                document.getElementById('iF5C1').innerHTML=parseInt((totalSingle)*.65*flexCost) + parseInt((totalFamily)*.65*flexCost);
                document.getElementById('iF5C2').innerHTML=parseInt((totalSingle)*.8*flexCost) + parseInt((totalFamily)*.8*flexCost);
                document.getElementById('iF5C3').innerHTML=parseInt((totalSingle)*1*flexCost) + parseInt((totalFamily)*1*flexCost);
                document.getElementById('iF6C0').innerHTML=parseInt((totalSingle)*.4*flexCost) + parseInt((totalFamily)*.4*flexCost) +parseInt(totalFamily*.4) + parseInt(totalSingle*.4);
                document.getElementById('iF6C1').innerHTML=parseInt((totalSingle)*.65*flexCost) + parseInt((totalFamily)*.65*flexCost) +parseInt(totalFamily*.65) + parseInt(totalSingle*.65);
                document.getElementById('iF6C2').innerHTML=parseInt((totalSingle)*.8*flexCost) + parseInt((totalFamily)*.8*flexCost) +parseInt(totalFamily*.8) + parseInt(totalSingle*.8);
                document.getElementById('iF6C3').innerHTML=parseInt((totalSingle)*1*flexCost) + parseInt((totalFamily)*1*flexCost) +parseInt(totalFamily*1) + parseInt(totalSingle*1);
            }


原文：https://stackoverflow.com/questions/43878383
更新时间：2023-07-03 20:07

最满意答案

 Can't set headers after they are sent通常表示您响应请求两次 。 
 

 你不能这样做。 
 

 对于每个request / request ，应该只有一个response / res 。 
 

app.get('/', function(req, res) {
  // you respond to the request here
  res.sendFile('./index.html',{root: __dirname});
  // and you respond again here
  res.send(data)
});

 

 确定是否要sendFile()或send(data)该端点。 
 

 从您的代码判断，您可能想要创建另一个端点，使用您的AJAX调用，然后执行后者 
 

// serve your index
app.get('/', function(req, res) {
  res.sendFile('./index.html',{root: __dirname})
});

// serve your data
// Your AJAX call should hit this endpoint instead
app.get('/data', function(req, res) {
  var data = 'lorem ipsum dolor';
  res.send(data);
});


Can't set headers after they are sent usually indicates that you respond to a request twice. 
 

You can't do that. 
 

For each request/req there should only be one response/res.
 

app.get('/', function(req, res) {
  // you respond to the request here
  res.sendFile('./index.html',{root: __dirname});
  // and you respond again here
  res.send(data)
});

 

Decide if you want to sendFile() OR send(data) for that endpoint.
 

Judging from your code you probably want to create another endpoint, to hit with your AJAX call, where it does the latter
 

// serve your index
app.get('/', function(req, res) {
  res.sendFile('./index.html',{root: __dirname})
});

// serve your data
// Your AJAX call should hit this endpoint instead
app.get('/data', function(req, res) {
  var data = 'lorem ipsum dolor';
  res.send(data);
});

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