js输入框输入点击按钮添加表单元素

绝地灬酷狼 2022-01-28 00:25 609阅读 0赞

## 添加表单元素 ##

html
    <div id="form">
        请输入姓名: <input type="text" id="name"> <br>
        请输入性别: <input type="radio" id="sex" name="sex" checked>男 
        	<input type="radio" name="sex">女<br>
        请输入年龄: <input type="text" id="age">
        <button>添加到表格</button>
    </div>
    <table id="tab">
        <thead>
            <tr>
                <th  width="20%"><input type="checkbox" id="all">全选</th>
                <th>姓名</th>
                <th>性别</th>
                <th>年龄</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td><input type="checkbox"></td>
                <td>张三</td>
                <td>女</td>
                <td>88</td>
            </tr>
            <tr>
                <td><input type="checkbox"></td>
                <td>李四</td>
                <td>男</td>
                <td>18</td>
            </tr>
            <tr>
                <td><input type="checkbox"></td>
                <td>王五</td>
                <td>女</td>
                <td>1</td>
            </tr>
        </tbody>
    </table>
    <div id="div1">
        <button>删除所选行</button>
    </div>

css
     #form{width: 480px;margin: 30px auto;border: 1px solid #eee;border-radius: 5px;padding: 10px;line-height: 30px;position: relative;}
            button{position: absolute;right: 10px;bottom: 10px;}
            #tab{width: 500px;margin: 30px auto;border-collapse: collapse;}
            th,td{border: 1px solid #000;padding: 5px;}
            tbody tr td:first-child{text-align: center;}
            /*input[type]  属性选择器  选择input标签，并且有type属性input标签*/
            /*input[type = "checkbox"]  选择有type属性并且值为checkbox的input标签*/
            input[type="checkbox"]{width: 15px;height: 15px;}
            #div1{position: relative;width: 480px;padding: 10px;margin: 0 auto;}

js
      var oInput = document.getElementById("form").getElementsByTagName("input");
               var oBut = document.getElementsByTagName("button");
               var oTable = document.getElementsByTagName("table")[0];
               var tBodies = oTable.tBodies[0];
               var allBut = document.getElementById("all");
    			
               //2.点击添加到表格，获取输入框中的内容，在表格中添加一行
                oBut[0].onclick = function () {
                    //1.创建行
                    var tr = document.createElement("tr");
    
                    //3.添加单元格
                    tr.appendChild(createNode("td","<input type='checkbox' />"));
                    tr.appendChild(createNode("td", oInput[0].value));
                    tr.appendChild(createNode("td",oInput[1].checked == true?"男":"女"));
                    tr.appendChild(createNode("td", oInput[3].value));
    
                    //2.添加行到表格
                    tBodies.appendChild(tr);
                    checkAll();
                }
    
                function createNode(element,text) {
                    var td = document.createElement(element);
                    td.innerHTML = text;
                    return td;
                }
    
    
    
               //3.删除
                oBut[1].onclick = function () {
                    for(var i = 0;i<tBodies.rows.length;i++){
                      var oIn = tBodies.rows[i].getElementsByTagName("input")[0];
                      if(oIn.checked == true){ //是选中
                          tBodies.rows[i].remove();
                          i--;
                      }
                    }
                }
    
                //4.点击全选按钮，全选下面所有的input
                allBut.onclick = function () {
                    var oI = tBodies.getElementsByTagName("input");
                    console.log(oI);
                    for(var i = 0;i<oI.length;i++){
                        oI[i].checked = allBut.checked;
                    }
                }
    
                //5.全部选中input时，全选
                checkAll();//一开始就应该初始化
                function checkAll () {
                	var oI = tBodies.getElementsByTagName("input");
                	for(var i = 0;i<oI.length;i++){
    	                oI[i].onclick = function () {
    	                    //假设全选了，然后去循环验证假设是否成立，
    	                    //如果有任何一个input没有被选中，假设不成立，则为false
    	                    var tr = true;  //假设
    	                    for(var j = 0;j<oI.length;j++){
    	                        if(oI[j].checked == false){
    	                            tr = false;
    	                            break;
    	                        }
    	                    }
    	                    allBut.checked = tr;
    	                }
    	            }
                }
            }

效果图  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N0eWxlMjAxOTA0_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N0eWxlMjAxOTA0_size_16_color_FFFFFF_t_70]: /images/20220128/d80cd21cc5e24e38aac054e07256edc8.png