c# - How to validate TextBox and label values -



c# - How to validate TextBox and label values -

need validate label values(get database) , textbox values(user enters). if textbox field value greater label value means, have show error or warning message.

here's simple javascript validator looking for.

demo:

output:

script: class="lang-js prettyprint-override">document.getelementbyid( 'numbers' ).addeventlistener( 'keyup', function ( event ) { if( event.srcelement.classname == 'validate' ) { var value = event.srcelement.value, validationvalue = event.srcelement.nextsibling.textcontent; if( isnan( value ) ) { event.srcelement.nextsibling.classname = 'error-nan'; } else if( parseint( value ) > parseint( validationvalue ) ) { event.srcelement.nextsibling.classname = 'error-too-large'; } else { event.srcelement.nextsibling.classname = ''; }; }; } ); html: class="lang-html prettyprint-override"><form id="numbers"> <input class="validate" /><label>15</label><br /> <input class="validate" /><label>7</label><br /> </form> css: class="lang-css prettyprint-override">.error-too-large::after { color: red; content: 'value large'; padding-left: 5px; } .error-nan::after { color: red; content: 'value not number'; padding-left: 5px; }

c# javascript asp.net ajax

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