JS & JQuery dynamically add select option

Today a friend asked me a question about dynamically adding options in 221f08282418e2996498697df914ce4e. At first, I thought it was dynamically added in JS, so I used the method of dynamically adding options in JS, but you used JQuery, so There will always be errors. Please note the difference between adding options in JS and JQuery.

JS：

var selid = document.getElementById("sltid");
for(var i=0; i<10;i++){ //循环添加多个值
sid.option[i] = new Option(i,i);
}
sid.options[sid.options.length]=new Option("1","2"); // 在最后一个值后面添加多一个

JQuery：

$("#selectId").append("<option value=&#39;"+value+"&#39;>"+text+"</option>");

Of course, in addition to this sentence, there are also ways to set the default selection value, the first value, the last value, the Nth value, etc., so I searched on the Internet:

jQuery gets the Text and Value selected by Select:

1. $("#select_id").change(function(){//code...}); //Add events for Select, Triggered when one of the items is selected

2. var checkText=$("#select_id").find("option:selected").text(); //Get the Text selected by Select

3. var checkValue=$("#select_id").val(); //Get the Value selected by Select

4. var checkIndex=$("# select_id ").get(0).selectedIndex; //Get the index value selected by Select

5. var maxIndex=$("#select_id option:last").attr("index") ; //Get the maximum index value of Select

jQuery to add/delete the Option item of Select:

1. $("#select_id").append("< ;option value='Value'>Text4afa15d3069109ac30911f04c56f3338"); //Add an Option (drop-down item) to Select

2. $("#select_id").prepend(" b93adbf83522c105f4709f0807fe84aePlease select4afa15d3069109ac30911f04c56f3338"); //Insert an Option (first position) for Select

3. $("#select_id option :last").remove(); //Delete the Option with the largest index value in Select (the last one)

4. $("#select_id option[index='0']").remove (); //Delete the Option (first one) with index value 0 in Select

5. $("#select_id option[value='3']").remove(); //Delete the Option with Value='3' in Select

5. $("#select_id option[text='4']").remove(); //Delete the Text= in Select '4''s Option

The above is the knowledge about dynamically adding select options in JS & JQuery introduced by the editor. I hope it will be helpful to you. If you have any questions, please let me know. Leave a message and the editor will reply to you in time. I would also like to thank you all for your support of the PHP Chinese website!

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