Html 将文本框值转换为 int
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Converting text box value to int
提问by krikara
I have been trying to apply solutions I found on both Google and Stackoverflow, but they don't seem to be working.
我一直在尝试应用我在 Google 和 Stackoverflow 上找到的解决方案，但它们似乎不起作用。
What exactly is going wrong here? The checkbox is insignificant here and I can take it out, but it makes no difference.
这里到底出了什么问题？复选框在这里无关紧要，我可以将其删除，但没有任何区别。
<div class="form-group">
<label for="tbid" class="col-lg-3 control-label">Results per page </label>
<div class="col-lg-3">
<input type="checkbox" class="checkbox" display="inline-block" name="checkbox_results" onclick="checkbox_results_click();">
<input type="text" id="results" class="form-control" name="results" placeholder="results">
</div>
</div>
Then in the js portion, I am trying to convert results into an int.
然后在 js 部分，我试图将结果转换为 int。
<script type="text/javascript">
int results = null;
var x=document.getElementById("results").value;
results = parseInt(x);
if(results==null)
results=10;
var pager = new Pager(results);
</script>
EDIT: I should also add that if I just put a int parameter when calling pager, like 25, for example, it actually works. So something is going wrong with results.
编辑：我还应该补充一点，如果我在调用寻呼机时只输入一个 int 参数，例如 25，它实际上可以工作。所以结果出了问题。
回答by Rishab Arya
Instead of using parseIntuse parseFloatit will work like this
而不是使用parseIntuseparseFloat它会像这样工作
results = parseFloat(x);
回答by Rishab Arya
Use parseFloat it will work like this
使用 parseFloat 它会像这样工作
<script type="text/javascript">
int results = null;
var x=document.getElementById("results").value;
results = parseFloat(x);
if(results==null)
results=10;
var pager = new Pager(results);
</script>回答by Sudhir Bastakoti
there's no intin js, you could do:
intjs中没有，你可以这样做：
var results;
var x=document.getElementById("results").value;
results = /^[\d]+$/.test(x);
if(!results)
results=10;
var pager = new Pager(results);
回答by aaronps
The trick is +(element.value), add || default_value in case is invalid, or nothing. Or add your own checks.
诀窍是 +(element.value)，添加 || 如果 default_value 无效，或者什么都没有。或者添加您自己的检查。
<!DOCTYPE html>
<html><head><title>to int()</title>
<script type="text/javascript">
function doResults()
{
var element = document.getElementById('results'),
value = +(element.value) || 0;
// write back the value in case is invalid
element.value = value;
alert("The value is " + value);
}
</script></head>
<body>
<input type="text" id="results" class="form-control" name="results" placeholder="results">
<button onclick="doResults();">Check Results</button>
</body></html>
