html - Runnning javascript for dropdown on page load? -


i have js function controls appearnace of select element upon change. however, 1 thing need code run start when element loads selected options class should have been applied.

css:

  select {height: 50px; width: 80px; border: solid 1px #c8c8c8; color:rgba(0, 0, 0, 0);} select:focus, #select:focus {   color:black; }  .lightgrey {background: lightgrey} .green {background:green} .orange {background:orange} .yellow {background:yellow} .red {background:red} .purple {background:purple}

javascript:

function colourfunction(select) {         var colour = select.options[select.selectedindex].classname;          select.classname = colour;         select.blur();     }

select:

<select class="selectelement" runat="server" id="dropdown_" onchange="colourfunction(this)">                     <option selected="selected" class="lightgrey" value="n">n</option>                     <option class="green" value="g">g</option>                     <option class="orange" value="o">o</option>                     <option class="yellow" value="a">a</option>                     <option class="red" value="r">r</option>                     <option class="purple" value="u">u</option>                 </select>

i want class n applied on load color:rgba(0, 0, 0, 0);

if you're using jquery:

$(function(){  //all onload actions want });

if want stick pure js

document.onreadystatechange=function(){ //all onload actions want }

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