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How to select the value specified in the select component with JQuery

php中世界最好的语言
Release： 2018-03-28 14:53:02
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This time I will bring you JQueryHow to select the value specified in the select component. What are the precautions for JQuery to select the value specified in the select component. The following is a practical case. Let’s take a look.

jquery gets the text and value selected by select

Get select:

Get the selected text of select:

$(“#ddlregtype”).find(“option:selected”).text();
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Get the selected value of select:

$(“#ddlregtype “).val();
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Get the selected value of selectindex:

$(“#ddlregtype “).get(0).selectedindex;
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Set select:

Set select selected index: 

$(“#ddlregtype “).get(0).selectedindex=index;//index为索引值
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Set select selected value: 

(“#ddlregtype “).attr(“value”,”normal“);(“#ddlregtype “).attr(“value”,”normal“);(“#ddlregtype “).val(“normal”); 
$(“#ddlregtype “).get(0).value = value;
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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);
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Set 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='0']").remove();//删除索引值为0的option
$("#select_id option[value='3']").remove(); //删除值为3的option
$("#select_id option[text='4']").remove(); //删除text值为4的option
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Clear select: 

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

<