How jquery operates select

jQuery can add, delete and clear the select, such as adding content after the element through the append method, removing the content through the remove method, and clearing the content through the empty method.

jQuery is a lightweight JavaScript function library , it includes the operation of HTML elements, event functions, special effects animation and other functions. Today we will introduce one of the jQuery event methods - the select method, which has certain reference value and I hope it will be helpful to everyone

[Recommended course: jQuery Tutorial]

The select method in jQuery is when the textarea or text type input element When the text is selected, the select event will be triggered, or the function run when the select event occurs. Next, in the article, we will introduce in detail how to operate the select method, that is, add, delete and clear

jQuery gets the text and value selected by the select method:

//获取Select选择的text
var checkText=$("#select_id").find("option:selected").text(); 
//获取Select选择的Value
var checkValue=$("#select_id").val(); 
//获取Select选择的索引值 
var checkIndex=$("#select_id ").get(0).selectedIndex;
 //获取Select最大的索引值
var maxIndex=$("#select_id option:last").attr("index");

jQuery adds option items in select:

Add option content to select through the append and prepend methods

append(): Indicates inserting content at the end of the element

prepend(): Indicates inserting content at the beginning of the element

  $("select").append("<option>第四个元素</option>")

Effect picture:

 $("select").prepend("<option>第四个元素</option>")

Effect Picture:

##jQuery deletes the option item in select

Example:

//删除索引值最大的option值
$("#select_id option:last").remove(); 
//删除select中Value='3'的option值
$("#select_id option[value='3']").remove();

jQuery clears the option value in the select

You can clear the value in the select through the empty function

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

Rendering:

Reference article for this article:

https://www. html.cn/doc/jquery/event-select/

https://www.html.cn/doc/jquery/dom-add/

https://www.html. cn/doc/jquery/dom-remove/

Summary: The above is the entire content of this article. I hope this article can help everyone understand the select method.

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