This question already has an answer here: Validate decimal numbers in JavaScript - IsNumeric() 48 answers 请试试这个答案: function audience_details(){ var aud1, aud2, total; if(document.getElementById("audience_1_field").value == "" || !onlyNos(document.getElementById("audience_1_field"))){ alert("Please enter valid number in audience 1"); } else if(document.ge
这个问题在这里已经有了答案: 验证JavaScript中的十进制数 - IsNumeric()48回答 请试试这个答案: function audience_details(){ var aud1, aud2, total; if(document.getElementById("audience_1_field").value == "" || !onlyNos(document.getElementById("audience_1_field"))){ alert("Please enter valid number in audience 1"); } else if(document.getElementById("audience_2_fi
Possible Duplicate: Validate numbers in JavaScript - IsNumeric() I have the following (working) code that searches for the string "type 1" in my Json , but how can I search for a number? I am guessing that I need to change RegExp to Number, but I can't get it to work, it tells me that v.properties.code in not a function. $.each(geojson.features, function (i, v) { if (v.pro
可能重复: 验证JavaScript中的数字 - IsNumeric() 我有以下(工作)代码在我的Json中搜索字符串“类型1”,但我如何搜索一个数字? 我猜测我需要将RegExp更改为Number,但是我无法使其正常工作,它告诉我v.properties.code不是函数。 $.each(geojson.features, function (i, v) { if (v.properties.code.search(new RegExp(/type 1/i)) != -1) { Count++; } }); 数字在他们的原型中没有搜索功能,所以
This question already has an answer here: Validate decimal numbers in JavaScript - IsNumeric() 48 answers use isNaN() and pass a string or number to it. It will return true or false. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN Try var input = 1; console.log(typeof input === "number"); See typeof var input1 = 1, input2 = "1"; console.log(typeo
这个问题在这里已经有了答案: 验证JavaScript中的十进制数 - IsNumeric()48回答 使用isNaN()并将字符串或数字传递给它。 它会返回true或false。 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN 尝试 var input = 1; console.log(typeof input === "number"); 见typeof var input1 = 1, input2 = "1"; console.log(typeof input1 === "number", typeof input2 === "num
This question already has an answer here: Validate decimal numbers in JavaScript - IsNumeric() 48 answers isNaN returns true if the value passed is not a number(NaN) (or if it cannot be converted to a number, so, null , true and false will be converted to 0 ), otherwise it returns false . In your case, you have to remove the ! before the function call! It is very easy to understand the be
这个问题在这里已经有了答案: 验证JavaScript中的十进制数 - IsNumeric()48回答 如果传递的值不是数字(NaN) (或者它不能被转换为数字,那么null , true和false将被转换为0 ), isNaN将返回true ,否则返回false 。 在你的情况下,你必须删除! 在函数调用之前! 理解脚本的行为是非常容易的。 isNaN只是检查一个值是否可以转换为int。 要做到这一点,你只需要乘以或除以1,或者减去或加0.在你的情况下,如果你
This question already has an answer here: Validate decimal numbers in JavaScript - IsNumeric() 48 answers function isNumber(val){ return typeof val==='number'; } If I needed to write an isNumber function for an API I would use: function isNumber(val) { return !isNaN(val); } ...but I wouldn't bother writing an isNumber function, as I'd just use isNaN . 如果你想让"23&quo
这个问题在这里已经有了答案: 验证JavaScript中的十进制数 - IsNumeric()48回答 function isNumber(val){ return typeof val==='number'; } 如果我需要为API编写isNumber函数,我将使用: function isNumber(val) { return !isNaN(val); } ...但我不打扰编写isNumber函数,因为我只是使用isNaN 。 如果你想让"23"成为一个数字,那么function isNumber(val) { return !isNaN(val); }
Possible Duplicate: Validate numbers in JavaScript - IsNumeric() Hi I am trying to validate a field using javascript to ensure that the field is not empty AND only contains numbers I am using document.getElementById to get the value of the field, then using this function to validate it: function isNumeric(elem, message, messsage2) { if(isNaN(elem)) { alert(message2); return
可能重复: 验证JavaScript中的数字 - IsNumeric() 您好,我正在尝试验证使用JavaScript的字段,以确保该字段不是空的,只包含数字 我使用document.getElementById来获取字段的值,然后使用这个函数来验证它: function isNumeric(elem, message, messsage2) { if(isNaN(elem)) { alert(message2); return false; } else if (elem == null || elem =="") { alert(message); return f
Possible Duplicate: Validate numbers in JavaScript - IsNumeric() var miscCharge = $("#miscCharge").val(); I want to check misCharge is number or not? Is there any method or easy way in jQuery or JavaScript to do this? HTMl is <g:textField name="miscCharge" id ="miscCharge" value="" size="9" max="100000000000" min="0" /> function isNumber(n) { return !isNaN(parseFloat(n)) &&am
可能重复: 验证JavaScript中的数字 - IsNumeric() var miscCharge = $("#miscCharge").val(); 我想检查misCharge是否是数字? 有没有什么方法或简单的方法在jQuery或JavaScript来做到这一点? HTMl是 <g:textField name="miscCharge" id ="miscCharge" value="" size="9" max="100000000000" min="0" /> function isNumber(n) { return !isNaN(parseFloat(n)) && isFinite(n); } 您有多种选择,具
I have a textarea input element, If the user types "@" I want to replace it with @[someTextHere]. I'm using JQuery's keypress event, but I havent been able to get what I want, I keep getting the "@" at the end of the string , Ie [someTextHere]@. Is it possible? My Code: <html> <head> <script src="http://code.jquery.com/jquery-latest.
我有一个textarea输入元素, 如果用户键入“@”,我想用@ [someTextHere]替换它。 我正在使用JQuery的按键事件,但我还没有能够得到我想要的,我不断得到字符串末尾的“@”,即[someTextHere] @。 可能吗? 我的代码: <html> <head> <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script> </head> <body> <te
I would like to display a live video stream in a web browser. (Compatibility with IE, Firefox, and Chrome would be awesome, if possible.) Someone else will be taking care of streaming the video, but I have to be able to receive and display it. I will be receiving the video over UDP, but for now I am just using VLC to stream it to myself for testing purposes. Is there an open source library tha
我想在网络浏览器中显示实时视频流。 (如果可能的话,与IE,Firefox和Chrome的兼容性将非常棒。)其他人会照看视频流,但我必须能够接收并显示它。 我将通过UDP接收视频,但现在我只是使用VLC将其流式传输给我自己进行测试。 有没有一个开源的库可以帮助我使用HTML和/或JavaScript来完成这项工作? 或者一个好的网站可以帮助我弄清楚如何自己做到这一点? 我已经阅读了一些关于RTSP的内容,这看起来像这样的传统选项。
I'm sure I'm overlooking something but I can't seem to get the "mouseleave" event to fire after I replace the html within the anchor tag that triggered the mouseenter. Adding code here but really it's much simpler if you visit the JSFiddle link below and hover over the star icons. $(document).ready(function () { $(document).on('mouseenter', '[id^=star-]', function
我确定我忽略了一些东西,但是在替换触发mouseenter的定位标记内的html后,我似乎无法得到“mouseleave”事件触发。 在这里添加代码,但实际上,如果您访问下面的JSFiddle链接并将鼠标悬停在星形图标上,则会更简单。 $(document).ready(function () { $(document).on('mouseenter', '[id^=star-]', function () { $('[id^=star-]').html('<span class="star star-empty"></span>'); }).on('mouse