How can I change the colour of a button using JavaScript? -


i want change coilor of button on mouse click white red red white if click again. tried this:

<script language="javascript"> <!-- function changecolor(id){ var series = "0";  var = window.getcomputedstyle(document.getelementbyid(id)).backgroundcolor;  var b = 2 if (a == "#ff4f4f") {     b = 1 }  if (b == 1) {     document.getelementbyid(id).style.backgroundcolor = "#ffffff"; }  if (b == 2) {     document.getelementbyid(id).style.backgroundcolor = "#ff4f4f"; }  }    //--> </script>

it won't work. make button go red in mozilla, chrome won't click white. ie says "error in page". button html code is:

<input type = "button" id = "01" value="01" onclick="changecolor('01')">

something missing css styles. looks first read (of colour) null value makes button go red -in 2 browsers- way function of mine constructed. looks if condition not working properly, see red , make white.

the computed style of background colour of format rgb(###, ###, ###) (or variations thereof, such different whitespace or rgba) therefore comparing #xxxxxx not work.

since you're assigning style.backgroundcolor, can read back:

var elem = document.getelementbyid(id); if( elem.style.backgroundcolor == "#ff4f4f") {     elem.style.backgroundcolor = "#ffffff"; } else {     elem.style.backgroundcolor = "#ff4f4f"; }

feel free switch cases around needed (based on how should change first time), work because browser keep whatever assigned it.

however, in general, should have more reliable toggle:

var elem = document.getelementbyid(id); if( elem._toggle) {     elem.style.backgroundcolor = "#ffffff"; } else {     elem.style.backgroundcolor = "#ff4f4f"; } elem._toggle = !elem._toggle;

this toggle reliably.


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