检查对象是否是文本框 - javascript
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check if object is a textbox - javascript
提问by simplified.
I understand that we can use (javascript)
我知道我们可以使用 (javascript)
if (typeof textbox === "object") { }
but are there methods which will allow me to ensure that the object is a textbox?
但是有没有方法可以让我确保对象是一个文本框？
回答by Mick Owen
var isInputText = obj instanceof HTMLInputElement && obj.type == 'text';
回答by Onur Y?ld?r?m
As of 2016, use this:
截至2016 年，使用这个：
function isTextBox(element) {
var tagName = element.tagName.toLowerCase();
if (tagName === 'textarea') return true;
if (tagName !== 'input') return false;
var type = element.getAttribute('type').toLowerCase(),
// if any of these input types is not supported by a browser, it will behave as input type text.
inputTypes = ['text', 'password', 'number', 'email', 'tel', 'url', 'search', 'date', 'datetime', 'datetime-local', 'time', 'month', 'week']
return inputTypes.indexOf(type) >= 0;
}
回答by Jordan
Are you looking for something like this?
你在寻找这样的东西吗？
if(textbox.tagName && textbox.tagName.toLowerCase() == "textarea") {
alert('this is a textarea');
}
If you need to know if it's a text input, you can do this:
如果您需要知道它是否是文本输入，您可以这样做：
if(textbox.tagName && textbox.tagName.toLowerCase() == "input" && textbox.type.toLowerCase() == "text") {
alert('this is a text input');
}
回答by Michael Berkowski
If it's a text input you're looking for:
如果它是您正在寻找的文本输入：
if (textbox.tagName == "input" && textbox.getAttribute("type") == "text") {
// it's a text input
}
If you're looking for a textarea
如果您正在寻找文本区域
if (textbox.tagName == "textarea") {
// it's a textarea
}
回答by thescientist
I think perhaps you would want to get a reference to an element, and then check for the return value of .type i.e.
我想也许你想得到一个元素的引用，然后检查 .type 的返回值，即
var element = document.getElementById('element_in_question');
if(element.type == "textarea"){
console.log('I must be textarea');
}
回答by vrunoa
if(textbox instanceof HTMLInputElement && textbox.getAttribute("type") == "text") {
alert("I'm an input text element");
}
