java - Check for if condition JSP and run js function -

java - Check for if condition JSP and run js function -

i trying utilize if jsp status within javascript function initiated onload in jsp site doing wrong. trying check url parameter , actulary run function when parameter found. here code.

<script language="javascript"> function raj(){ <%if (string "contact"=request.getparameter("contact");) %>{ <% string str=request.getparameter("video"); %> var s="<%=str%>"; alert(s); } } </script>

it syntax problem i'm origin jsp.

you can't create variable in if statement. first create variable initialize , check it. don't forget close if block }.

<script language="javascript"> function raj(){ <%string contact; if ((contact=request.getparameter("contact")) != null) %>{ <% string str=request.getparameter("video"); %> var s="<%=str%>"; alert(s); <%}%> } </script>

java javascript jsp if-statement