Javascript 清除 JQuery 中的文本字段值
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Clear text field value in JQuery
提问by Yuschick
I understand this is an easy question but for some reason this just isn't working for me. I have a function that is triggered everytime a drop down menu is changed. Here is the relevant code that is suppose to grab the current value of the text field, if a value exists, clear it that is contained within the .change function:
我知道这是一个简单的问题,但出于某种原因,这对我不起作用。我有一个每次更改下拉菜单时都会触发的功能。这是假设获取文本字段的当前值的相关代码,如果存在值,则清除它包含在 .change 函数中:
var doc_val_check = $('#doc_title').attr("value");
if (doc_val_check.length > 0) {
doc_val_check == "";
}
I feel like I am missing something very simple.
我觉得我错过了一些非常简单的东西。
回答by thecodeparadox
doc_val_check == ""; // == is equality check operator
should be
应该
doc_val_check = ""; // = is assign operator. you need to set empty value
// so you need =
You can write you full code like this:
您可以像这样编写完整的代码:
var doc_val_check = $.trim( $('#doc_title').val() ); // take value of text
// field using .val()
if (doc_val_check.length) {
doc_val_check = ""; // this will not update your text field
}
To update you text field with a ""
you need to try
要使用""
您需要尝试的更新文本字段
$('#doc_title').attr('value', doc_val_check);
// or
$('doc_title').val(doc_val_check);
But I think you don't need above process.
但我认为你不需要上述过程。
In short, just one line
简而言之,只有一行
$('#doc_title').val("");
Note
笔记
.val()
use to set/ get value in text field. With parameter it acts as setter and without parameter acts as getter.
.val()
用于在文本字段中设置/获取值。带参数它充当setter,不带参数充当getter。
Read more about .val()
阅读更多关于 .val()
回答by thebiffboff
If you want to clear the text field, use:
如果要清除文本字段,请使用:
$('#doc_title').val("");
回答by Tooraj Jam
Instead of all those:
而不是所有这些:
$('#doc_title').attr("value", "");
回答by xdazz
What you need is:
你需要的是:
if ($('#doc_title').val()) {
$('#doc_title').val('');
}
回答by Sankar
In simple way, you can use the following code to clear all the text field, textarea, dropdown, radio button, checkbox in a form.
简单来说,您可以使用以下代码清除表单中的所有文本字段、文本区域、下拉列表、单选按钮、复选框。
function reset(){
$('input[type=text]').val('');
$('#textarea').val('');
$('input[type=select]').val('');
$('input[type=radio]').val('');
$('input[type=checkbox]').val('');
}
回答by Praveen Kumar Purushothaman
If you are using jQuery, then you can use this:
如果你使用 jQuery,那么你可以使用这个:
// var doc_val_check = $('#doc_title').val(); - No need of this!
if ($('#doc_title').val().length > 0) {
$('#doc_title').val("");
}
回答by Muhammad Kamran
you can clear it by using this line
您可以使用此行清除它
$('#TextBoxID').val("");
回答by Asad Ali
We can use this for text clear
我们可以用它来清除文本
$('input[name="message"]').val("");
回答by Hrushi
First Name: <input type="text" autocomplete="off" name="input1"/> <br/> Last Name: <input type="text" autocomplete="off" name="input2"/> <br/> <input type="submit" value="Submit" /> </form>
First Name: <input type="text" autocomplete="off" name="input1"/> <br/> Last Name: <input type="text" autocomplete="off" name="input2"/> <br/> <input type="submit" value="Submit" /> </form>
回答by SherCoder
You are comparing doc_val_check
with an empty string. You want to assign the empty string to doc_val_check
您正在doc_val_check
与空字符串进行比较。您想将空字符串分配给doc_val_check
so it should be this:
所以应该是这样的:
doc_val_check = "";
doc_val_check = "";