Předchozí Index Další

Výpočet hodnoty odporu
Ukázka DownLoad


<HTML>
<HEAD>
<TITLE>JavaScript DESTINATION</TITLE>
<SCRIPT LANGUAGE="JavaScript1.1">
<!--

var multiplier = new Array()
multiplier[0] = 0
multiplier[1] = 1
multiplier[2] = 2
multiplier[3] = 3
multiplier[4] = 4
multiplier[5] = 5
multiplier[6] = 6
multiplier[7] = 7
multiplier[8] = 8
multiplier[9] = 9
multiplier[10] = -1
multiplier[11] = -2

var tolerance = new Array()
tolerance[0] = "+/-5%"
tolerance[1] = "+/-10%"
tolerance[2] = "+/-20%"

function format(ohmage) {
if (ohmage >= 10e6) {
ohmage /= 10e5
return "" + ohmage + " Mohmov"
} else {
if (ohmage >= 10e3) {
ohmage /= 10e2
return "" + ohmage + " kohmov"
} else {
return "" + ohmage + " ohmov"
}
}
}

function calcOhms() {
var form = document.forms[0]
var d1 = form.tensSelect.selectedIndex
var d2 = form.onesSelect.selectedIndex
var m = form.multiplierSelect.selectedIndex
var t = form.toleranceSelect.selectedIndex
var ohmage = (d1 * 10) + d2
ohmage = eval("" + ohmage + "e" + multiplier[m])
ohmage = format(ohmage)
var tol = tolerance[t]
document.forms[1].result.value = ohmage + ", " + tol
}

var colorList = "cierna,modra,hneda,zlata,siva,zelena,ziadna,oranzova,cervena,strieborna,fialova,biela,zlta"
var colorArray = colorList.split(",")
var imageDB = new Array()
for (i = 0; i < colorArray.length; i++) {
imageDB[colorArray[i]] = new Image(21,182)
imageDB[colorArray[i]].src = "images/r" + colorArray[i] + ".gif"
}

function setTens(choice) {
var tensColor = choice.options[choice.selectedIndex].text
document.tens.src = imageDB[tensColor].src
calcOhms()
}
function setOnes(choice) {
var onesColor = choice.options[choice.selectedIndex].text
document.ones.src = imageDB[onesColor].src
calcOhms()
}
function setMult(choice) {
var multColor = choice.options[choice.selectedIndex].text
document.mult.src = imageDB[multColor].src
calcOhms()
}
function setTol(choice) {
var tolColor = choice.options[choice.selectedIndex].text
document.tol.src = imageDB[tolColor].src
calcOhms()
}
function showIntro() {
window.open("resintro.htm","","WIDTH=400,HEIGHT=260")
}
// -->
</SCRIPT>
</HEAD>

<BODY BGCOLOR="#FFFFFF" onLoad="calcOhms()">
<CENTER>
<H3>Identifikacia hodnoty odporu podla farebnych pruzkov</H3>
<FORM>
<SELECT NAME="tensSelect" onChange="setTens(this)">
<OPTION SELECTED> cierna
<OPTION> hneda
<OPTION> cervena
<OPTION> oranzova
<OPTION> zlta
<OPTION> zelena
<OPTION> modra
<OPTION> fialova
<OPTION> siva
<OPTION> biela
</SELECT>
<SELECT NAME="onesSelect" onChange="setOnes(this)">
<OPTION SELECTED> cierna
<OPTION> hneda
<OPTION> cervena
<OPTION> oranzova
<OPTION> zlta
<OPTION> zelena
<OPTION> modra
<OPTION> fialova
<OPTION> siva
<OPTION> biela
</SELECT>
<SELECT NAME="multiplierSelect" onChange="setMult(this)">
<OPTION SELECTED> cierna
<OPTION> hneda
<OPTION> cervena
<OPTION> oranzova
<OPTION> zlta
<OPTION> zelena
<OPTION> modra
<OPTION> fialova
<OPTION> siva
<OPTION> biela
<OPTION> zlata
<OPTION> strieborna
</SELECT>    
<SELECT NAME="toleranceSelect" onChange="setTol(this)">
<OPTION SELECTED> zlata
<OPTION> strieborna
<OPTION> ziadna
</SELECT>
</FORM>
<SCRIPT LANGUAGE="JavaScript1.1">
var form = document.forms[0]
var tensDigit = form.tensSelect.selectedIndex
var tensColor = form.tensSelect.options[tensDigit].text
var onesDigit = form.onesSelect.selectedIndex
var onesColor = form.onesSelect.options[onesDigit].text
var multDigit = form.multiplierSelect.selectedIndex
var multColor = form.multiplierSelect.options[multDigit].text
var tolDigit = form.toleranceSelect.selectedIndex
var tolColor = form.toleranceSelect.options[tolDigit].text

var table ="<TABLE BORDER=0>"
table += "<TR><TH ALIGN=middle>Hodnota odporu:</TH><TD ALIGN='middle'><FORM><INPUT TYPE='text' NAME='result' SIZE=20></FORM>"
table +="</TD></TR><TR><TD COLSPAN=2>"
table +="<IMG SRC='images/resleft.gif' WIDTH=127 HEIGHT=182>" +
"<IMG SRC='images/r" + tensColor + ".gif' NAME='tens' WIDTH=21 HEIGHT=182>"+
"<IMG SRC='images/r" + onesColor + ".gif' NAME='ones' WIDTH=21 HEIGHT=182>"+
"<IMG SRC='images/r" + multColor + ".gif' NAME='mult' WIDTH=21 HEIGHT=182>"+
"<IMG SRC='images/spacer.gif' WIDTH=17 HEIGHT=182>"+
"<IMG SRC='images/r" + tolColor + ".gif' NAME='tol' WIDTH=21 HEIGHT=182>"+
"<IMG SRC='images/resright.gif' WIDTH=127 HEIGHT=182>"
table += "</TD></TR></TABLE>"
document.write(table)
</SCRIPT>
</BODY>
</HTML>