Syntax problem with the "SWITCH" Command

[trbjr]

There is something I don't understand about the syntax of the SWITCH command. Here is the code that does not work:

 
    switch (msgtype == )  {
        case '0' :
            title = "Error Condition -- see Tom ";
            break;
        case '1' :
            title = "Domestic Program";  
            break;
        case '2' :
            title = "Ken ";
            break;
        case '3' :
            title = "Tom";
            break;
        case '4' :
            title = "ISSA Preparers";                   
            break;
        case '5' :
            title = "Unanticipated Condition Found-- see Tom ";
            break;
        default :
            title = "msgtype has unexpected value";
    }        
 
 

Is my error that I have "==" following msgtype in the expression?

Should I have double quotes (") around each case value?

Can anyone recommend a good javascript book that shows the finer points of javascript syntax?

TIA

trbjr

[gits]

hi ...

correct usage is as follows:

switch (variable) {
case var_value_1:
    // do something;
    break;
case var_value_2:
    // do something;
    break;
default:
    // do something;
    break;
}

i prefer to add the break to the default-case ... but it is not required. whether you have to add quotes to the var_values depends on the type of your var that is 'switched' ... in case you put a number in ... you don't need to ... when it is a stringvalue you may use single- or double-quotes

kind regards

ps: good book is the david flanagan 'javascript: the definitive guide' - book, be sure to get an actual one ... i think there is the 5th edition already

[epots9]

There is something I don't understand about the syntax of the SWITCH command. Here is the code that does not work:

 
    switch (msgtype == )  {
        case '0' :
            title = "Error Condition -- see Tom ";
            break;
        case '1' :
            title = "Domestic Program";  
            break;
        case '2' :
            title = "Ken ";
            break;
        case '3' :
            title = "Tom";
            break;
        case '4' :
            title = "ISSA Preparers";                   
            break;
        case '5' :
            title = "Unanticipated Condition Found-- see Tom ";
            break;
        default :
            title = "msgtype has unexpected value";
    }        
 
 

Is my error that I have "==" following msgtype in the expression?

Should I have double quotes (") around each case value?

Can anyone recommend a good javascript book that shows the finer points of javascript syntax?

TIA

trbjr

try this:

 
    switch (msgtype)  { //remove the ==
        case '0' :
            title = "Error Condition -- see Tom ";
            break;
        case '1' :
            title = "Domestic Program";  
            break;
        case '2' :
            title = "Ken ";
            break;
        case '3' :
            title = "Tom";
            break;
        case '4' :
            title = "ISSA Preparers";                   
            break;
        case '5' :
            title = "Unanticipated Condition Found-- see Tom ";
            break;
        default :
            title = "msgtype has unexpected value";
    }        
 
 

minor edit (but a big problem).

good luck

[trbjr]

Thanks, Gits. I think that will do it.

Also, I appreciate the book tip. What did you mean by your comment: "...be sure to get an actual one..."?

trbjr

[trbjr]

Thanks also to epots9. I will try your suggestion too.
trbjr

[gits]

Thanks, Gits. I think that will do it.

Also, I appreciate the book tip. What did you mean by your comment: "...be sure to get an actual one..."?

trbjr

the 5th edition ... not one before ... the 5th has a lot more on oo-javascript if you need it sometimes ... and more dom-handling too ;) ...

kind regards

[trbjr]

gits,

Thanks for the clarification. That helps.

trbjr

[gits]

... glad to be able to help you ... in case you have more questions come back and we will help you again ;)

kind regards