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Using jQuery, how can I add a default value of http:// into an input field that can’t be removed, but that still allows you to type a URL after it?
Default: http://
Url: http://www.domain.name
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The readonly attribute makes a form control non-editable (or “read only”). A read-only field can't be modified, but, unlike disabled , you can tab into it, highlight it, and copy its contents. Setting the value to null does not remove the effects of the attribute. Instead use removeAttribute('readonly') .
Answer: Use the HTML5 contenteditable Attribute You can set the HTML5 contenteditable attribute with the value true (i.e. contentEditable="true" ) to make an element editable in HTML, such as <div> or <p> element.
To limit an HTML input box to accept numeric input, use the <input type="number">. With this, you will get a numeric input field. After limiting the input box to number, if a user enters text and press submit button, then the following can be seen “Please enter a number.”
this works well for me:
$("input").keydown(function(e) { var oldvalue=$(this).val(); var field=this; setTimeout(function () { if(field.value.indexOf('http://') !== 0) { $(field).val(oldvalue); } }, 1); }); http://jsfiddle.net/J2BKU/
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