如何自动增加按钮单击时动态添加的输入字段（类型=文本）中的值？

Question

我想要一个“ sr.no”的值。 每次单击添加新子句的按钮时，该字段都会自动递增。

HTML：

<div id="clauseDiv">
<div class="col-sm-12">
    <div class="col-sm-6">
        <div class="form-group">
            <label class="control-label col-sm-2" for="clause">Clause: </label>
            <div class="col-sm-10">
                <input type="text" class="form-control clauseHeader" v-bind:id="'clauseHeader-' + clause.contractGroupId" 
                    name="clause"  :key="index" v-bind:value="clause.contractGroupName" readonly="readonly"/>
            </div>
        </div>
    </div>
    <div class="col-sm-4">
        <div class="form-group">
            <label class="control-label col-sm-2" for="sequence">Sr.no.: </label>
            <div class="col-sm-4">
                <input type="text" class="form-control clauseSequence" v-bind:id="'clauseSequence-' + clause.contractGroupId" name="sequence" 
                :key="index" v-bind:value="clause.sequence" />
            </div>
        </div>
    </div>
    <div class="col-sm-12">
        <div class="form-group">
            <label class="control-label col-sm-1" for="subClause">Subclause: </label>
            <div class="col-sm-11">
                    <div>
                        <textarea class="form-control subClause" v-bind:id="'subClause-' + clause.contractGroupId" 
                        :key="index" readonly="readonly"></textarea> 
                    </div>
            </div>
        </div>
    </div>
</div>

JS：

var clauseHtml = '<div class="col-sm-12" id="clause-'+this.count+'">'+
                '<div class="col-sm-6">'+
                    '<div class="form-group">'+
                    '   <label class="control-label col-sm-2" for="clause">Clause: </label>'+
                    '    <div class="col-sm-10">'+
                   '        <input type="text" class="form-control clauseAddlTermHeader" id="clauseHeader-'+this.count+'" name="clause" />'+
                  '      </div>'+
                 '   </div>'+
                '</div>'+
                '<div class="col-sm-4">'+
                    '<div class="form-group">'+
                  '      <label class="control-label col-sm-2" for="sequence">Sr.no: </label>'+
                 '       <div class="col-sm-4">'+
                '           <input type="text" class="form-control clauseAddlTermSequence" id="clauseSequence-'+this.count+'" name="sequence"/>'+
               '        </div>'+
              '      </div>'+
             '   </div>'+
             '<div class="col-sm-2">'+
                '<div class="form-group">'+
            '       <button type="button" class="btn btn-danger deleteClause" id="deleteClause-'+this.count+'" v-on:click="deleteClause">Delete</button>'+
          '      </div>'+
         '   </div>'+
            '<div class="col-sm-12">'+
              '  <div class="form-group">'+
             '      <label class="control-label col-sm-1" for="subClause">Subclause: </label>'+
            '       <div class="col-sm-11">'+
           '           <textarea class="form-control clauseAddlTermSubClause" id="subClause-'+this.count+'" ></textarea>'+
          '         </div>'+
         '       </div>'+
        '    </div>'+
         '</div>';
                $('#clauseDiv').append(clauseHtml);
                this.count++;

从html，我要添加div，其中包含“ clause”，“ sr.no”。 和“子句”字段。 我有一个按钮，当单击该按钮时，将执行js部分，并且div会附加更多“子句”，“ sr.no”。 和“子句”字段被添加。 我希望新添加的“ sr.no”字段中的值从前一个字段开始自动递增。 我怎么做？

Answer 1

从this.count删除this ， this.count count作为全局变量，将value="' + count +'"到输入中，它应该像这样

'<input type="text" class="form-control clauseAddlTermSequence" id="clauseSequence-' + count + '" name="sequence" value="' + count +'"/>'

演示：

 var count = 0; $('#addClause').on('click', function() { var clauseHtml = '<div class="col-sm-12" id="clause-' + count + '">' + '<div class="col-sm-6">' + '<div class="form-group">' + ' <label class="control-label col-sm-2" for="clause">Clause: </label>' + ' <div class="col-sm-10">' + ' <input type="text" class="form-control clauseAddlTermHeader" id="clauseHeader-' + count + '" name="clause" />' + ' </div>' + ' </div>' + '</div>' + '<div class="col-sm-4">' + '<div class="form-group">' + ' <label class="control-label col-sm-2" for="sequence">Sr.no: </label>' + ' <div class="col-sm-4">' + ' <input type="text" class="form-control clauseAddlTermSequence" id="clauseSequence-' + count + '" name="sequence" value="' + count +'"/>' + ' </div>' + ' </div>' + ' </div>' + '<div class="col-sm-2">' + '<div class="form-group">' + ' <button type="button" class="btn btn-danger deleteClause" id="deleteClause-' + count + '" v-on:click="deleteClause">Delete</button>' + ' </div>' + ' </div>' + '<div class="col-sm-12">' + ' <div class="form-group">' + ' <label class="control-label col-sm-1" for="subClause">Subclause: </label>' + ' <div class="col-sm-11">' + ' <textarea class="form-control clauseAddlTermSubClause" id="subClause-' + count + '" ></textarea>' + ' </div>' + ' </div>' + ' </div>' + '</div>'; $('#clauseDiv').append(clauseHtml); count++; }) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <button id="addClause">addCaluse</button> <div id="clauseDiv"></div>