html - Weird JavaScript behaviour with variable/alert -


i'm trying variable html form. can read of values except one, on absolutely nothing different.

i tried console.log starttijd, shows nothing in console. when alert starttijd show me right value. code i'm running:

function validategroepslesform() {      var message = "";    var date = document.forms["groepslesform"]["date"].value;    if (!date) {      message += "vul een geldige datum in<br>";    }      var endtime = document.forms["groepslesform"]["endtime"].value;    if (endtime == "") {      message += "vul een geldige eindtijd in<br>";    }      var starttijd = document.forms["groepslesform"]["starttime"].value;    if (starttijd = "") {      message += "vul een geldige starttijd in<br>";    }    console.log(starttijd);      var participants = document.forms["groepslesform"]["participants"].value;    if (participants == "0") {      message += "vul een geldig aantal deelnemers in<br>";    }
<p>datum:</p>  <input type="date" name="date" id="futuredate" value="" />  <p>start tijd:</p>  <input type="text" name="starttime" id="starttime" placeholder="start tijd van de groepsles" value="" />  <p>eind tijd:</p>  <input type="text" name="endtime" id="endtime" placeholder="eind tijd van de groepsles" value="" />  <p>maximaal aantal deelnmers</p>  <input type="number" name="participants" id="participants" min="0" value="16" />

your comparison check assignment in code. change to:

if (starttijd == "") {     message+= "vul een geldige starttijd in <br>"; }

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