用jQuery选择带有上一个和下一个的选项

Question

I have bug when I click next or prev button. Here is my HTML

 $("#nextPage").click(function() { $('#pagination option:selected').next().attr('selected', 'selected'); console.log("hahaha next"); }) $("#prevPage").click(function() { $('#pagination option:selected').prev().attr('selected', 'selected'); console.log("prev"); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="button" value="prev" id="prevPage"> <select id="pagination"> <option value="1" selected>1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> </select> <input type="button" value="next" id="nextPage"> 

Here is my jsfiddle

Thank you

Answer 1

Use prop instead of attr and its work perfect.

 $("#nextPage").click(function() { $('#pagination option:selected').next().prop('selected', 'selected'); console.log("hahaha next"); }) $("#prevPage").click(function() { $('#pagination option:selected').prev().prop('selected', 'selected'); console.log("prev"); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="button" value="prev" id="prevPage"> <select id="pagination"> <option value="1" selected>1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> </select> <input type="button" value="next" id="nextPage"> 

Answer 2

Use .prop instead of .attr as .attr will just add an extra attribute to each option whilst .prop will actually change the selected item

 $("#nextPage").click(function() { $('#pagination option:selected').next().prop('selected', true); console.log("hahaha next"); }) $("#prevPage").click(function() { $('#pagination option:selected').prev().prop('selected', true); console.log("prev"); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="button" value="prev" id="prevPage"> <select id="pagination"> <option value="1" selected>1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> </select> <input type="button" value="next" id="nextPage">