检查一个int输入长度

由 发布于 javascripthtml
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您好，我尝试在字段中的整数为4时隐藏组。

$( "#ssnInput" ).keyup(function() {
 if( $('#ssnInput').value.toString().length = 4 ) {
    $('#ssnInputGroup').style.display = "none";
    }
});

知道为什么这行不通吗？

评论
  • DJHongKong
    DJHongKong 回复

    I believe that you are using jquery and so you should be doing .val() instead of .value.

    In fact, I think you are mixing up the two things. Even where you are setting the display to none. It should just be .hide().

  • laut
    laut 回复

    你有逻辑上的问题

    $('#ssnInput').value.toString().length = 4

    应该

    $('#ssnInput').value.toString().length == 4 // or ===
  • DJHongKong
    DJHongKong 回复

    First of all, you are missing =.

    Secondly, you can use .val().

    像这样：

    $("#ssnInput").val().length