JQuery selects the selected value method of the select component

Below I will share with you an article about the value method of selecting the selected component in JQuery. It has a good reference value and I hope it will be helpful to everyone.

jquery gets the text and value selected by select

Get select:

Get the selected text of select:

$(“#ddlregtype”).find(“option:selected”).text();

Get the selected value of select:

$(“#ddlregtype “).val();

Get the selected index of select:

$(“#ddlregtype “).get(0).selectedindex;

Set select ：

Set select selected index:

$(“#ddlregtype “).get(0).selectedindex=index;//index为索引值

Set select selected value:

(“#ddlregtype “).attr(“value”,”normal“);(“#ddlregtype “).attr(“value”,”normal“);(“#ddlregtype “).val(“normal”); 
$(“#ddlregtype “).get(0).value = value;

Set select selected text :

var count=$("#ddlregtype option").length;
 for(var i=0;i<count;i++)
   {      if($("#ddlregtype ").get(0).options[i].text == text)
    {
      $("#ddlregtype ").get(0).options[i].selected = true;
      break;
    }
  }
$("#select_id option[text=&#39;jquery&#39;]").attr("selected", true);

Set the select option item:

$("#select_id").append("<option value=&#39;value&#39;>text</option>"); //添加一项option
$("#select_id").prepend("<option value=&#39;0&#39;>请选择</option>"); //在前面插入一项option
$("#select_id option:last").remove(); //删除索引值最大的option
$("#select_id option[index=&#39;0&#39;]").remove();//删除索引值为0的option
$("#select_id option[value=&#39;3&#39;]").remove(); //删除值为3的option
$("#select_id option[text=&#39;4&#39;]").remove(); //删除text值为4的option

Clear the select:

$("#ddlregtype ").empty();

Work needs to get the values ​​​​in the two forms. As shown in the picture:

How to get the value added from the left selection box to the right selection box? I thought about using web page special effects to get it, and the more popular jquery was used here.

js code is as follows:

//获取所有属性值 var item = $("#select1").val();
$(function(){
 $('#select1').each( //获得select1的所有值
   function(){
    $('button').click(function(){
      alert($('#select2').val()); //获得select2中的select1值
    });
   });
})
</script>

It is worth noting that it cannot be written directly as

$(function(){
 $('#select2').each( //获得select1的所有值，因为前面讲选项从左边添加到右边，jquery其实并没有真正将值从左边传到右边。
   function(){
    $('button').click(function(){
      alert($(this).val()); //获得select2中的select1值
    });
   });
})

html:

Option 1
Option 2
Option 3
Option 4
Option 5
Option 6
Option 7

Select to add to the right>>
Add all to the right>>

Use JQuery and Ajax to call the option of dynamically filling the Select Options

//绑定ClassLevel1单击事件
  $("#ClassLevel1").change(function () {
    var id = $("#ClassLevel1").val();
    var level2 = $("#ClassLevel2");
    level2.empty();
    $("#ClassLevel3").hide();
    $.ajax({
      url: "./askCommon.ashx?action=getclasslevel&pid=" + id,
      data: { "type": "ajax" },
      datatype: "json",
      type: "get",
      success: function (data) {
        var json = eval_r(data);
        for (var ind in json) {
          level2.append($("<option value=&#39;" + json[ind].id + "&#39;>" + json[ind].typename + "</option>"));
        }

      }
    });
  })

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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