检查一个int输入长度

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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？

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DJHongKong
DJHongKong

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().

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laut
laut

你有逻辑上的问题

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

应该

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

First of all, you are missing =.

Secondly, you can use .val().

像这样：

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