How to use js to obtain form form data-JS Tutorial-php.cn

How to use js to obtain form form data

王林

Release： 2020-04-09 09:13:07

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How to use js to obtain form form data

The method is as follows:

1. Sometimes I want to be lazy. There is a large amount of form submission data on the page, and it is troublesome to obtain it individually every time. There is also a lot of code redundancy, so a method is encapsulated.

2. The form element must have a name attribute. The name attribute is the field data submitted to the backend.

3. html code

<h3>下拉框</h3>
 <select name="sel" id="sel" class="query">
  <option value ="sel-1">sel-1</option>
  <option value ="sel-2">sel-2</option>
 </select>
 <h3>输入框</h3>
 <input type="text" name="text1" class="query" value="hello" />
 <input type="text" name="text2" class="query" value="word" />
 <h3>密码框</h3>
 <input type="password" name="password" class="query" value="123456" />
 <h3>单选框</h3>
 单选1<input type="radio" name="radio" class="query" value="r1" checked />
 单选2<input type="radio" name="radio" class="query" value="r2" checked/>
 单选3<input type="radio" name="radio" class="query" value="r3" />
  <h3>复选框</h3>
 复选框1<input type="checkbox" name="check" id="" class="query" value="c1" checked/>
 复选框2<input type="checkbox" name="check" id="" class="query" value="c2" />
 复选框3<input type="checkbox" name="check" id="" class="query" value="c3" checked/>
 <h3>search</h3>
 <input type="range" name="range" id="" class="query" value="" />
 <input type="color" name="color" id="" class="query" value="" />
 <h3>
  <button type="button" id="save">
   提交
  </button>
 </h3>

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4. The JQ library is introduced here.

4.1. js code block

Instructions for use: Just pass in the class name when calling the method.

// 封装方法，获取到form表单的数据。使用此方法，表单元素必须存在那么属性。
  //el:元素的class名称。
  function getParameter(el){
   var obj={};
   $(el).each(function(index,item){
    // 判断元素的类型
    if(item.type=="text" || item.type=="password" || item.type=="select-one" || item.type=="tel" || 
     item.type=="search" || item.type=="range" || item.type=="number" || item.type=="month" || 
     item.type=="email" || item.type=="datetime-local" || item.type=="datetime" || item.type=="date" || 
     item.type=="color"){
     //获取到name的值,name的值就是向后台传递的数据
     obj[$(this).attr("name")]=$(this).val();
    }else if(item.type=="checkbox"){
     var stamp=false;
     if($(this).attr("name") && !stamp){
      stamp=false;
      // 获取到复选框选中的元素
      var checkboxEl=$("input[name="+$(item).attr(&#39;name&#39;)+"]:checked");
      if(checkboxEl){
       var checkboxArr=[];
       // 取出复选框选中的值
       checkboxEl.each(function(idx,itm){
        checkboxArr.push($(itm).val());
       });
       obj[$(this).attr("name")]=checkboxArr.join(",");
      }
      
     }
    }else if(item.type=="radio"){
     // 获取到单选框选中的值
     var radio_val=$("input[name="+$(item).attr(&#39;name&#39;)+"]:checked").val();
     if(radio_val){
      obj[$(item).attr("name")]=radio_val;
     }
    }
   });
   return obj;
  }
  // 调用方法
  $("#save").click(function(){
  　　 var　parameter=getParameter(".query");
　　　　 　　console.log(parameter); 
　　　　　});

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