Previous Example-|-Next Example-|-Return to Chapter Listing
Example 7.13:
Built-in Functions--parseFloat
This page uses a built-in function, parseFloat(form.txtNum.value), to return a floating-point number. Type a number--try typing a decimal number into the first text box,
then click on the button to see the result. You can type in - to make your number negative or you can use "e" to represent exponential values:
These are the scripts we used. First, in the HEAD:
<![CDATA[
<SCRIPT LANGUAGE="JavaScript">
<!--
function GetFloat(form) {
form.txtFloat.value= parseFloat(form.txtNum.value)
}
//-->
</SCRIPT>
]]>
Later in the Web page the function is called from this form:
<![CDATA[
<FORM>
Type a number: <INPUT TYPE="text" NAME="txtNum" SIZE=12><P>
<INPUT TYPE="button" VALUE="Result" onclick="GetFloat(this.form)"> <INPUT TYPE="text" NAME="txtFloat" SIZE=30>
</FORM>
]]>
Previous Example-|-Next Example-|-Return to Chapter Listing