如何使用Javascript/Jquery动态添加输入字段的名称属性 [英] How to add name attribute of input field dynamically using Javascript/Jquery

问题描述

我需要一个帮助.我需要使用Javascript/Jquery动态添加输入字段名称属性.我每次都通过单击+按钮创建新字段，并通过单击-按钮删除必填字段.我在下面解释我的代码.

I need one help.I need to add input field name attribute dynamically using Javascript/Jquery. I am each time creating new field by clicking on + button and delete the required field by clicking on - button.I am explaining my code below.

function createNew(evt){
  $('#questionshowp1').append('<div class="form-group"><input name="questions1" id="questions1" class="form-control firstsec" placeholder="Text, Image URL, or LaTeX" value="" type="text"><div class="secondsec"><button type="button" class="btn btn-sm btn-success exp-add" style="line-height:12px;" onclick="createNew(this);"><i class="fa fa-plus" aria-hidden="true"></i></button><button type="button" class="btn btn-sm btn-danger exp-minus" style="line-height:12px;" onclick="deleteNew(this)"><i class="fa fa-minus" aria-hidden="true"></i></button></div></div>');
  $(evt).css('display', 'none');
  $(evt).siblings("button.btn-danger").css('display', 'block');
}
function deleteNew(evnt){
  $(evnt).closest(".form-group").remove();
}

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<div class="questionshowp" id="questionshowp1">
  <div class="form-group">
    <input name="questions0" id="questions0" class="form-control firstsec" placeholder="Text, Image URL, or LaTeX" value="" type="text">
    <div class="secondsec">
      <button type="button" class="btn btn-sm btn-success exp-add" style="line-height:12px;" onclick="createNew(this);"><i class="fa fa-plus" aria-hidden="true"></i></button>
      <button type="button" class="btn btn-sm btn-danger exp-minus" style="line-height:12px;display:none;" onclick="deleteNew(this)"><i class="fa fa-minus" aria-hidden="true"></i></button>
    </div>                                                            
  </div>
</div>

这里我使用+按钮创建新字段，在这里我需要像questions0,questions1,questions2....这样增加名称属性值.假设用户删除任何字段，那么这个给定的顺序将保留所有字段作为名称属性值.请帮助我.

Here i am creating new field using + button and here i need to increment the name attribute value like questions0,questions1,questions2.... this.Suppose user delete any field then also this given order will remain with all field as name attribute value.Please help me.

推荐答案

具有附加的代码段.

function createNew(evt){
  var cur=$("input:text").length+1;
  
     $('#questionshowp1').append('<div class="form-group"><input name="questions'+cur+'" id="questions1" class="form-control firstsec" placeholder="Text, Image URL, or LaTeX" value="" type="text"><div class="secondsec"><button type="button" class="btn btn-sm btn-success exp-add" style="line-height:12px;" onclick="createNew(this);">+<i class="fa fa-plus" aria-hidden="true"></i></button><button type="button" class="btn btn-sm btn-danger exp-minus" style="line-height:12px;" onclick="deleteNew(this)">-<i class="fa fa-minus" aria-hidden="true"></i></button></div></div>');
     $(evt).css('display', 'none');
     $(evt).siblings("button.btn-danger").css('display', 'block');
  var i=0;
   $('input[type="text"]').each(function(){
      $(this).attr('name', 'questions' + i); 
      $(this).attr('id', 'questions' + i); 
     i++;
  });
}
function deleteNew(evnt){
     $(evnt).closest(".form-group").remove();
   var i=0;
   $('input[type="text"]').each(function(){
      $(this).attr('name', 'questions' + i); 
      $(this).attr('id', 'questions' + i); 
     i++;
  });
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="questionshowp" id="questionshowp1">
<div class="form-group">
<input name="questions0" id="questions0" class="form-control firstsec" placeholder="Text, Image URL, or LaTeX" value="" type="text">
<div class="secondsec">
<button type="button" class="btn btn-sm btn-success exp-add" style="line-height:12px;" onclick="createNew(this);">+<i class="fa fa-plus" aria-hidden="true"></i></button>
<button type="button" class="btn btn-sm btn-danger exp-minus" style="line-height:12px;display:none;" onclick="deleteNew(this)">-<i class="fa fa-minus" aria-hidden="true"></i></button>
</div>                                                            
 </div>
 </div>

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