I'm using a variable in Javascript which will be set via Php e.g. var usesInterview = <?php echo 1;?>

If not, then var usesInterview = <?php echo 0;?>

How best should I handle this in my code? There will be a If statement to check for the variable and determine the route to take.

I've tried using typeof() == 1 and when I set it to 0, it still carries out the routine as if it where 1.

I'm using a variable in Javascript which will be set via Php e.g. var usesInterview = <?php echo 1;?>

If not, then var usesInterview = <?php echo 0;?>

How best should I handle this in my code? There will be a If statement to check for the variable and determine the route to take.

I've tried using typeof() == 1 and when I set it to 0, it still carries out the routine as if it where 1.

• php
• javascript

• Did you find any of the answers usefull? – NilColor Commented Nov 11, 2010 at 7:46

4 Answers 4

Why not set it with javascript:

usesInterview = 1;

Even if you set it with PHP, you can check like this:

if (usesInterview === 1){
  // variable is equal to 1
}
else if (usesInterview === 0){
  // variable is equal to 0
}

Notice the === to check for both type as well as value. If you don't want to check for type, you need to use == like this:

if (usesInterview == 1){
  // variable is equal to 1 or "1" or true
}
else if (usesInterview == 0){
  // variable is equal to 0 or "0" or "" or false
}

You should avoid the later approach when you are sure about both type as well as value.

More Information:

• http://w3schools./JS/js_parisons.asp

There are so many ways you can do it... Ie

var usesInterview = <?php echo [0|1];?>
usesInterview ? goingTrueWay() : goingFalsegWay();

or

<?php echo [0|1];?> ? goingTrueWay() : goingFalseWay();

or something like this:

var waysCollection = {
    0: function () {...} //routine for usesInterview == 0
    1: function () {...} //routine for usesInterview == 1
}
waysCollection[<?php echo [0|1];?>]();

also you can use one of the early suggestion:

if (<?php echo [0|1];?>) {
  // truthy branch
} else {
  // falsy branch
}

BTW, if you want usesInterview to be a boolean, yes/no trigger, - use true/false not 0/1. Its easier to read and understand later. For ex

var usesInterview = <?php echo [false|true];?>
if (usesInterview) {
  //do this if `true`
} else {
  //do this if `false`
}

typeof will return the type of the value - "number" in this case. You're using a non-strict equality check (==) so "number" == 1 is true.

Just check the value, using type-strict equality operator (===):

if (usesInterview === 1) {
    // do something
}
else if (usesInterview === 0) {
    // do something else
}

Read more about JavaScript parison operators at https://developer.mozilla/en/JavaScript/Reference/Operators/Comparison_Operators.

When usesInterview is 1 it's truthy. So it's as simple as:

if (usesInterview) {
  // truthy branch
} else {
  // falsy branch
}