Question

我正在实现逻辑，根据用户是否输入一系列数字或字母，使用url作为查询参数。如果用户输入数字，则应使用第一个urlLocation，否则应使用第二个<input id="imageid" type="text" /> if ($("#imageid").val() == '/[^0-9\.]/') { var urlLocation = "http://www.url.com/rest/v1/cms/story/id/" + imageid.value + "/orientation/" + orientation; } else { var urlLocation = "http://www.url.com/rest/v1/cms/story/guid/" + imageid.value + "/orientation/" + orientation; }。试图为第一个使用正则表达式，但我不确定如何正确实现该正则表达式。

originalTransaction

JSFIDDLE示例：Link

Answer 1

只需使用isNaN检查是否有号码：

var val = $("#imageid").val();
if (isNaN(val)) {
    //Not a number!
} else {
    //Number!
}

Answer 2

您可以使用正则表达式，但您可能希望将其更改为包含星号。

您的另一个选择可能是将其转换为数字并查看它是否仍等于自身 -

var val = $("#imageid").val();
if (+val == val) {

Answer 3

你可能正在寻找类似的东西：

<form id="myForm">
<input id="imageId" type="text" />
<input type="submit">
</form>

$(document).on('submit','#myForm',function(){
if (/^[\d]+$/.test($("#imageId").val())) {
var urlLocation = "http://www.url.com/rest/v1/cms/story/id/" + imageid.value + "/orientation/" + orientation;
} else {
var urlLocation = "http://www.url.com/rest/v1/cms/story/guid/" + imageid.value + "/orientation/" + orientation;
}
});

CODEPEN DEMO

正则表达式解释：

^[\d]+$
-------

Assert position at the beginning of a line (at beginning of the string or after a line break character) (line feed, line feed, line separator, paragraph separator) «^»
Match a single character that is a “digit” (ASCII 0–9 only) «[\d]+»
   Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert position at the end of a line (at the end of the string or before a line break character) (line feed, line feed, line separator, paragraph separator) «$»

检查数字或文本字符串的输入框

3 个答案: