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Javascript JS can move up or down the drop-down list option

Source: Internet
Author: User
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Compatible with Firefox, ie, and select option JS that can be moved up, down, top, and bottom. <br/> principle: <br/> top: this mainly refers to switching the option of the selected index and the text and value of the option above the selected index; moving these options down an index, finally, you can assign the text and value of the selected index to 0th options. <br/> move up: moving up refers to exchanging the selected index with the text and value of the selected option-1. <br/> moving down: opposite to going up, add 1 to the selected index selectedindex, that is, the next option of the selected option, and then use the variable to store the text and value of any of the two options for exchange; <br/> bottom: Switch the options from the selected option to the options length to the text and value, and finally switch the selected OPT The text and value of ion can be assigned to the last option. </P> <p> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <br/> <HTML> <br/> <pead> <br/> <title> moveoption.html </title> </P> <p> <meta http-equiv = "keywords" content = "keyword1, keyword2, keyword3 "> <br/> <meta http-equiv =" Description "content =" this is my page "> <br/> <meta http-equiv =" Content-Type" content = "text/html; charset = UTF-8 "> <br/> <script language =" JavaScript "> <br/> <! -- <Br/> function totop () {<br/> var box = document. getelementbyid ("sbox"); <br/> var Index = Box. selectedindex; <br/> If (index> 0) {<br/> var text = Box. options [Index]. text; <br/> var val = Box. options [Index]. value; <br/> for (VAR I = index; I> 0; I --) {<br/> box. options [I]. TEXT = Box. options [I-1]. text <br/> box. options [I]. value = Box. options [I-1]. value; <br/>}< br/> box. options [0]. value = val; <br/> box. Options [0]. TEXT = text; <br/> box. selectedindex = 0; <br/>}</P> <p> function toup () {<br/> var box = document. getelementbyid ("sbox"); <br/> var Index = Box. selectedindex; <br/> var I = index-1; <br/> If (index> 0) {<br/> var text = Box. options [I]. text; <br/> var val = Box. options [I]. value; <br/> box. options [I]. TEXT = Box. options [Index]. text <br/> box. options [I]. value = Box. options [Index]. value; <br /> Box. options [Index]. value = val; <br/> box. options [Index]. TEXT = text; <br/> box. selectedindex = I; <br/>}</P> <p> function todown () {<br/> var box = document. getelementbyid ("sbox"); <br/> var Index = Box. selectedindex; <br/> var I = 0; <br/> If (index! = Box. length-1) {<br/> I = index + 1 <br/> If (index <box. length) {<br/> var text = Box. options [I]. text; <br/> var val = Box. options [I]. value; <br/> box. options [I]. TEXT = Box. options [Index]. text <br/> box. options [I]. value = Box. options [Index]. value; <br/> box. options [Index]. value = val; <br/> box. options [Index]. TEXT = text; <br/> box. selectedindex = I; <br/>}</P> <p> function tofoot () {<br/> var box = document. getelementbyid ("sbox"); <br/> var Index = Box. selectedindex; <br/> var Len = Box. length; <br/> If (index <len-1) {<br/> var text = Box. options [Index]. text; <br/> var val = Box. options [Index]. value; <br/> for (var j = index + 1; j <= len-1; j ++) {<br/> box. options [J-1]. TEXT = Box. options [J]. text <br/> box. options [J-1]. value = Box. options [J]. value; <br/>}< br/> box. options [Len-1]. value = val; <br/> box. options [Len-1]. TEXT = text; <br/> box. selectedindex = len-1; <br/>}< br/> // --> <br/> </SCRIPT> </P> <p> </pead> </P> <p> <body> <br/> <select id = "sbox" size = "10" style = "width: 100px; Height: 150px; "> <br/> <option value = 1> A </option> <br/> <option value = 3> C </option> <br/> <option value = 4> E </option> <br/> <option value = 5> F </option> <br/> <option value = 7> 1 </option> <br/> <option value = 12> 5 </option> <br/> </SELECT> <br/> <input type = "button" value = "TOP" onclick = "totop () "/> <br/> <input type =" button "value =" up "onclick =" toup () "/> <br/> <input type =" button "value =" down "onclick =" todown () "/> <br/> <input type =" button "value =" bottom "onclick =" tofoot () "/> <br/> </body> <br/> </ptml> <br/>

 

 

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