jQuery Set Select Index

Question

I have an select box      lt select id  selectBox  gt      lt option value  0  gt Number 0 lt  option gt      lt option value  1  gt Number 1 lt  option gt      lt option value  2  gt Number 2 lt  option gt      lt option value  3  gt Number 3 lt  option gt      lt option value  4  gt Number 4 lt  option gt      lt option value  5  gt Number 5 lt  option gt      lt option value  6  gt Number 6 lt  option gt      lt option value  7  gt Number 7 lt  option gt    lt  select gt       I d like to set one of the options as  selected  based on it s selected index     For example  if I am trying to set  Number 3   I m trying this         selectBox   3  attr  selected    selected         But this doesn t work   How can I set an option as selected based on it s index using jQuery     Thanks

User · Answer

The pure javascript selectedIndex attribute is the right way to go because,it's pure javascript and works cross-browser:

$('#selectBox')[0].selectedIndex=4;

Here is a jsfiddle demo with two dropdowns using one to set the other:

<select onchange="$('#selectBox')[0].selectedIndex=this.selectedIndex">
  <option>0</option>
  <option>1</option>
  <option>2</option>
</select>

<select id="selectBox">
  <option value="0">Number 0</option>
  <option value="1">Number 1</option>
  <option value="2">Number 2</option>
</select>

You can also call this before changing the selectedIndex if what you want is the "selected" attribute on the option tag (here is the fiddle):

$('#selectBox option').removeAttr('selected')
   .eq(this.selectedIndex).attr('selected','selected');

User · Answer

Try this      select mySelect   prop  selectedIndex   optionIndex     Eventually  trigger a  change event       select mySelect   prop  selectedIndex   optionIndex  change

User · Answer

I ve always had issues with prop  selected    the following has always worked for me     first remove the current value     selectBox   children   removeAttr  selected        selectBox   children   eq index  attr  selected    selected

User · Answer

You can also init multiple values if your selectbox is a multipl       selectBox   val   A    B    C

User · Answer

Hope this could help Too      selectBox option value  3     attr  selected   true

User · Answer

Set element with index     select option eq 2    attr  selected    selected       Set element by text     select   val  option Text   attr  selected    selected      when you want to select with top ways for set selection   you can use     select option   removeAttr  selected    for remove previous selects       Set element by value     select   val  2       Get selected text     select   children  option selected   text       use attr   for get attributes     select option selected   text      use attr   for get attributes     Get selected value     select option selected   val        select   children  option selected   val        select option selected   prevAll   size       option selected  this  val       Get selected index     select option selected   index        select option   index     select option selected        Select First Option     select option first       Select Last Item     select option last   remove        Replace item with new one     select option eq 1    replaceWith   lt option value  2  gt new option lt  option gt        Remove an item     select option eq 0    remove

User · Answer

Shortly       selectBox   attr  selectedIndex  index   where index is the selected index as integer

User · Answer

Try this instead       selectBox   val 3

User · Answer

I often use trigger   change   to make it work      selectBox option eq position index    prop  selected   true  trigger  change      Example with id select   selectA1 and position index   0  frist option in select        selectA1 option eq 0    prop  selected   true  trigger  change

User · Answer

What s important to understand is that val   for a select element returns the value of the selected option  but not the number of element as does selectedIndex in javascript   To select the option with value  7  you can simply use       selectBox   val 7     this will select the option with value 7    To deselect the option use an empty array       selectBox   val        this is the best way to deselect the options   And of course you can select multiple options        selectBox   val  1 4 7      will select options with values 1 4 and 7    However to select multiple options  your  lt select gt  element must have a MULTIPLE attribute  otherwise it won t work

User · Answer

I need a solution that has no hard coded values in the js file  using selectedIndex  Most of the given solutions failed one browser  This appears to work in FF10 and IE8  can someone else test in other versions       selectBox   get 0  selectedIndex   1

User · Answer

In 1 4 4 you get an error       selectBox option   3  attr is not a function  This works      name option eq idx    attr  selected   true    Where  name is select id and idx is the option value you want selected

User · Answer

funcion para seleccionar por el text del select var text       var canal        name canal   val    split           id empresa option   each function i  option            text       id empresa option eq   i      text            if text toLowerCase      canal 0  toLowerCase                     id empresa option eq   i      attr  selected   true

User · Answer

To clarify Marc s and John Kugelman s answers  you could use      selectBox option   eq 3  attr  selected    selected    get   will not work if used in the way specified because it gets the DOM object  not a jQuery object  so the following solution will not work      selectBox option   get 3  attr  selected    selected    eq   gets filters the jQuery set to that of the element with the specified index  It s  clearer than       selectBox  option   get 3    It s not all that efficient        selectBox option   3   is more efficient  see test case   You don t actually need the jQuery object though  This will do the trick      selectBox option   3  selected   true   http   api jquery com get  http   api jquery com eq  One other vitally important point  The attribute  quot selected quot  is not how you specify a selected radio button  in Firefox and Chrome at least   Use the  quot checked quot  attribute      selectBox option   3  checked   true   The same goes for check-boxes

User · Answer

I faced same problem   First you need go through the events  i e which event is happening first    For example    The First event  is generating select box with options    The Second event is selecting default option using any function such as val   etc   You should ensure that the Second event should happen after the First event   To achieve this take two functions lets say generateSelectbox    for genrating select box  and selectDefaultOption    You need to ensure that selectDefaultOption   should be called only after the execution of generateSelectbox

User · Answer

Even simpler       selectBox option   3  selected   true

User · Answer

NOTE  answer is dependent upon jQuery 1 6 1       selectBox  nth-child 4    prop  selected   true      To select via index     selectBox option eq 3    prop  selected   true       To select via value     Thanks for the comment   get won t work since it returns a DOM element  not a jQuery one  Keep in mind the  eq function can be used outside of the selector as well if you prefer       selectBox option   eq 3  prop  selected   true       You can also be more terse readable if you want to use the value  instead of relying on selecting a specific index       selectBox   val  3      Note   val 3  works as well for this example  but non-numeric values must be strings  so I chose a string for consistency    e g   lt option value  hello  gt Number3 lt  option gt  requires you to use  val  hello

User · Answer

Select the item based on the value in the select list  especially if the option values have a space or weird character in it  by simply doing this       SelectList option   each function          if    this  val       1 00 PM             this  attr  selected    selected          Also  if you have a dropdown  as opposed to a multi-select  you may want to do a break  so you don t get the first-value-found to be overwritten

User · Answer

select 3rd option      selectBox   val     selectBox option   eq 2  val       Example on jsfiddle

User · Answer

If you just want to select an item based of a particular property of an item then jQuery option of type prop val  will get that item  Now I don t care about the index I just wanted the item by its value       mySelect options value 3   attr  selected    selected

User · Answer

This may also be useful  so I thought I d add it here    If you would like to select a value based on the item s value and not the index of that item then you can do the following   Your select list    lt select id  selectBox  gt       lt option value  A  gt Number 0 lt  option gt       lt option value  B  gt Number 1 lt  option gt       lt option value  C  gt Number 2 lt  option gt       lt option value  D  gt Number 3 lt  option gt       lt option value  E  gt Number 4 lt  option gt       lt option value  F  gt Number 5 lt  option gt       lt option value  G  gt Number 6 lt  option gt       lt option value  H  gt Number 7 lt  option gt   lt  select gt    The jquery         selectBox option value C    attr  selected    selected            selectBox option value C    prop  selected   true     The selected item would be  Number 2  now

User · Answer

selectBox option   get 3  attr  selected    selected     When using the above I kept getting errors in webkit  Chrome  saying     Uncaught TypeError  Object   has no method  attr    This syntax stops those errors          selectBox  option   get 3   attr  selected    selected

User · Answer

you can  set selectoption variable  value dynamically as well as option will be selected You can try following code  code     lt script src  http   ajax googleapis com ajax libs jquery 1 5 2 jquery min js  gt  lt  script gt              function                    allcheck   click function                        select option   val  1 2 5   also can use multi selectbox                      select option   val 1                  var selectoption 3                 selectBox gt option value   selectoption      attr  selected    selected                   HTML CODE       lt select id  selectBox  gt          lt option value  0  gt Number 0 lt  option gt          lt option value  1  gt Number 1 lt  option gt          lt option value  2  gt Number 2 lt  option gt          lt option value  3  gt Number 3 lt  option gt          lt option value  4  gt Number 4 lt  option gt          lt option value  5  gt Number 5 lt  option gt          lt option value  6  gt Number 6 lt  option gt          lt option value  7  gt Number 7 lt  option gt    lt  select gt   lt br gt   lt strong gt Select amp nbsp  amp nbsp   lt a style  cursor pointer   id  allcheck  gt click for select option lt  a gt  lt  strong gt

User · Answer

NB        selectBox option   3  attr  selected    selected      is incorrect  the array deference gets you the dom object  not a jquery object  so it will fail with a TypeError  for instance in FF with       selectBox option   3  attr   not a function

[jquery] jQuery Set Select Index

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