|
eval is an important function as it allows you build Javascript dynamically
|
|
For instance document.forms[0].actualtextname.value is value of form element specified as
|
|
<INPUT TYPE="text" NAME="actualtextname" VALUE="value" onChange="handle(this.name)" >
|
|
this.name holds actualtextname but as an ascii string which cannot be directly be used in
|
|
var x = document.forms[0].actualtextname.value;
|
|
var x = eval("document.forms[0]." + actualtextname + ".value"); // works!
|
|
eval applies JavaScript interpreter to argument and then re-interprets as shown above
|
|
This can be used to copy information between forms as in
|
|
eval("document.forms[1]." + actualtextname + ".defaultvalue") = eval("document.forms[0]." + actualtextname + ".value")
|
|
eval did not work properly for a long time! -- Please check on your browser
|
Secs 205.9
Addon
