js select multi-select list value passing code_form special effects

<title>js select</title> <form name="form1" method="post" action=""> <table border="0" align="center" width="75%" cellspacing="0" cellpadding="0"> <tr> <td> <table border="0" align="center"> <tr> <td> <select name="leftItem" style="width:200px" size="10" multiple> <option value="1">item1</option> <option value="2">item2</option> <option value="3">item3</option> <option value="4">item4</option> <option value="5">item5</option> </select> </td> </tr> </table> </td> <td> <table border="0" align="center"> <tr><td height="30"><input type="button" name="button1" style="width:50px" value=">" onclick="fMoveSelectedOptionsLeftToRight(document.all.leftItem,document.all.rightItem)"></td></tr> <tr><td height="30"><input type="button" name="button2" style="width:50px" value=">>" onclick="fMoveAllOptionsLeftToRight(document.all.leftItem,document.all.rightItem)"></td></tr> <tr> <td height="30"><input type="button" name="button3" style="width:50px" value="<" onClick="fMoveSelectedOptionsRightToLeft(document.all.leftItem,document.all.rightItem)"></td></tr> <tr><td height="30"><input type="button" name="button4" style="width:50px" value="<<" onClick="fMoveAllOptionsRightToLeft(document.all.leftItem,document.all.rightItem)"></td></tr> </table> <table border="0" align="center"> <tr><td height="30"><input type="button" name="button1" style="width:50px" value=">" onclick="fMoveSelectedOptionsLeftToRight(document.all.leftItem,document.all.rightItem)"></td> <td> </td> </tr> <tr> <td height="30"> <input type="button" name="button2" style="width:50px" value=">>" onclick="fMoveAllOptionsLeftToRight(document.all.leftItem,document.all.rightItem)"><table border="0" align="center"> <tr> <td> <select name="rightItem" style="width:200px" size="10" multiple> </select> </td> </tr> </table> </td> </tr> <tr><td height="30"><input type="button" name="button3" style="width:50px" value="<" onClick="fMoveSelectedOptionsRightToLeft(document.all.leftItem,document.all.rightItem)"></tr></table> <tr><td height="30"><input type="button" name="button4" style="width:50px" value="<<" onClick="fMoveAllOptionsRightToLeft(document.all.leftItem,document.all.rightItem)"><table border="0" align="center"> <tr height="40"> <td><input type="button" value="保存" onClick="checkForm()"></td> </tr> </table><script> /*移除左边选中的列表项到右边*/ function fMoveSelectedOptionsLeftToRight(oLeft,oRight) { if(!(oLeft&&oRight)) { return; } if(!hasOptions(oLeft)) { return; } if(oLeft.selectedIndex==-1) { oLeft.selectedIndex=0; } for(var i=0;i<oLeft.options.length;i++) { if(oLeft.options[i].selected) { var oOption = document.createElement("OPTION"); oOption.setAttribute("text",oLeft.options[i].text); oOption.setAttribute("value",oLeft.options[i].value); oRight.add(oOption); } } clearSelectedOptions(oLeft); } /*移除左边的所有列表项到右边*/ function fMoveAllOptionsLeftToRight(oLeft,oRight) { if(!(oLeft&&oRight)) { return; } if(!hasOptions(oLeft)) { return; } for(var i=0;i<oLeft.options.length;i++) { var oOption = document.createElement("OPTION"); oOption.setAttribute("text",oLeft.options[i].text); oOption.setAttribute("value",oLeft.options[i].value); oRight.add(oOption); } clearAllOptions(oLeft); } /*移除右边选中的列表项到左边*/ function fMoveSelectedOptionsRightToLeft(oLeft,oRight) { if(!(oLeft&&oRight)) { return; } if(!hasOptions(oRight)) { return; } if(oRight.selectedIndex==-1) { oRight.selectedIndex=0; } for(var i=0;i<oRight.options.length;i++) { if(oRight.options[i].selected) { var oOption = document.createElement("OPTION"); oOption.setAttribute("text",oRight.options[i].text); oOption.setAttribute("value",oRight.options[i].value); oLeft.add(oOption); } } clearSelectedOptions(oRight); } /*移除右边的所有列表项到左边*/ function fMoveAllOptionsRightToLeft(oLeft,oRight) { if(!(oLeft&&oRight)) { return; } if(!hasOptions(oRight)) { return; } for(var i=0;i<oRight.options.length;i++) { var oOption = document.createElement("OPTION"); oOption.setAttribute("text",oRight.options[i].text); oOption.setAttribute("value",oRight.options[i].value); oLeft.add(oOption); } clearAllOptions(oRight); } /*清空select所有options*/ function clearAllOptions(oSelect) { if(oSelect) { var ops=oSelect.options; while(ops.length>0) { oSelect.remove(ops.length-1); } } } /*清空select所有选中的options*/ function clearSelectedOptions(oSelect) { if(oSelect) { for(var i=0;i<oSelect.options.length;i++) { if(oSelect.options[i].selected) { oSelect.remove(i--); } } } } /*判断select是否有options*/ function hasOptions(oSelect) { if(oSelect) { return oSelect.options.length>0; } return false; } function checkForm(){ var onRight=document.forms[0].rightItem; alert(onRight.options.length); for(var i=0;i<onRight.options.length;i++){ var text=onRight.options[i].text; var value=onRight.options[i].value; alert(value+" "+text); } } </script> <🎜> <🎜> <🎜> <table border="0" align="center"> <tr> <🎜> <select name="rightItem" style="width:200px" size="10" multiple="multiple"> </select> <🎜> <🎜> <🎜> <🎜> <🎜> <🎜> <table border="0" align="center"> <tr height="40"> <🎜><input type="button" value="保存" onClick="checkForm()"><🎜> <🎜> <🎜></form> </body> </html>
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js core code

Copy code The code is as follows:

/*Remove the selected list item on the left to the right* /
function fMoveSelectedOptionsLeftToRight(oLeft,oRight)
{
if(!(oLeft&&oRight))
{
return;
}
if(!hasOptions(oLeft))
{
return;
}
if(oLeft.selectedIndex==-1)
{
oLeft.selectedIndex=0;
}
for(var i= 0;i{
if(oLeft.options[i].selected)
{
var oOption = document.createElement("OPTION");
oOption.setAttribute("text",oLeft.options[i].text);
oOption.setAttribute("value",oLeft.options[i].value);
oRight.add(oOption) ;
}
}
clearSelectedOptions(oLeft);
}
/*Remove all list items on the left to the right*/
function fMoveAllOptionsLeftToRight(oLeft,oRight)
{
if(!(oLeft&&oRight))
{
return;
}
if(!hasOptions(oLeft))
{
return;
}
for(var i=0;i{
var oOption = document.createElement("OPTION");
oOption.setAttribute("text",oLeft. options[i].text);
oOption.setAttribute("value",oLeft.options[i].value);
oRight.add(oOption);
}
clearAllOptions(oLeft) ;
}
/*Remove the selected list item on the right to the left*/
function fMoveSelectedOptionsRightToLeft(oLeft,oRight)
{
if(!(oLeft&&oRight))
{
return;
}
if(!hasOptions(oRight))
{
return;
}
if(oRight.selectedIndex==-1)
{
oRight.selectedIndex=0;
}
for(var i=0;i{
if(oRight.options[i].selected)
{
var oOption = document.createElement("OPTION");
oOption.setAttribute("text",oRight.options[i].text);
oOption.setAttribute("value" ,oRight.options[i].value);
oLeft.add(oOption);
}
}
clearSelectedOptions(oRight);
}
/*Remove the right one All list items to the left*/
function fMoveAllOptionsRightToLeft(oLeft,oRight)
{
if(!(oLeft&&oRight))
{
return;
}
if(! hasOptions(oRight))
{
return;
}
for(var i=0;i{
var oOption = document. createElement("OPTION");
oOption.setAttribute("text",oRight.options[i].text);
oOption.setAttribute("value",oRight.options[i].value);
oLeft.add(oOption);
}
clearAllOptions(oRight);
}
/*Clear all select options*/
function clearAllOptions(oSelect)
{
if(oSelect)
{
var ops=oSelect.options;
while(ops.length>0)
{
oSelect.remove(ops.length-1);
}
}
}
/*Clear all selected options*/
function clearSelectedOptions(oSelect)
{
if(oSelect)
{
for (var i=0;i{
if(oSelect.options[i].selected)
{
oSelect.remove(i--);
}
}
}
}
/*Judge whether select has options*/
function hasOptions(oSelect)
{
if(oSelect)
{
return oSelect.options.length>0;
}
return false;
}

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