HTML Javascript动态添加和删除文本框 [英] HTML Javascript dynamically add and remove textboxes

问题描述

我正在尝试使用javascript和HTML动态添加和删除文本框.我可以添加和删除它，但有时删除"按钮不起作用.当我检查元素时，它说删除按钮没有onclick值.我不明白为什么在添加功能中设置onclick的原因.

I'm trying to add and remove text boxes dynamically using javascript and HTML. I can get it to add and remove but sometimes the remove button doesn't work. when I inspect the element it says that there is no onclick value for the remove button. I don't understand why when I set the onclick in the add function.

这里是我的代码:

<div  id="reqs">
<h3 align = "center"> Requirements </h3>
<script>
    var reqs_id = 0;
    function removeElement(elementId,elementId2) {
        // Removes an element from the document
        var element2 = document.getElementById(elementId2);
        var element = document.getElementById(elementId);
        element2.parentNode.removeChild(element2);
        element.parentNode.removeChild(element);

    }   
    function add() {
        reqs_id++;// increment reqs_id to get a unique ID for the new element

        //create textbox
        var input = document.createElement('input');
        input.type = "text";
        input.setAttribute("class","w3-input w3-border");
        input.setAttribute('id','reqs'+reqs_id);
        var reqs = document.getElementById("reqs");
        //create remove button
        var remove = document.createElement('button');
        remove.setAttribute('id','reqsr'+reqs_id);
        remove.onclick = function() {removeElement('reqs'+reqs_id,'reqsr'+reqs_id);return false;};
        remove.setAttribute("type","button");
        remove.innerHTML = "Remove";
        //append elements
        reqs.appendChild(input);
        reqs.appendChild(remove);
    }

</script>
<button type="button" value="Add" onclick="javascript:add();"> Add</button> 

推荐答案

这将起作用:

<div id="reqs">
  <h3 align="center"> Requirements </h3>
</div>
<script>
  var reqs_id = 0;

  function removeElement(ev) {
    var button = ev.target;
    var field = button.previousSibling;
    var div = button.parentElement;
    div.removeChild(button);
    div.removeChild(field);
  }

  function add() {
    reqs_id++; // increment reqs_id to get a unique ID for the new element

    //create textbox
    var input = document.createElement('input');
    input.type = "text";
    input.setAttribute("class", "w3-input w3-border");
    input.setAttribute('id', 'reqs' + reqs_id);
    input.setAttribute('value', reqs_id);
    var reqs = document.getElementById("reqs");
    //create remove button
    var remove = document.createElement('button');
    remove.setAttribute('id', 'reqsr' + reqs_id);
    remove.onclick = function(e) {
      removeElement(e)
    };
    remove.setAttribute("type", "button");
    remove.innerHTML = "Remove" + reqs_id;
    //append elements
    reqs.appendChild(input);
    reqs.appendChild(remove);
  }

</script>
<button type="button" value="Add" onclick="javascript:add();"> Add</button>

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